JP2020043642A - Power system and processing device - Google Patents

Abstract

To provide a power system in which power control using a control command value can be continued even when a communication abnormality occurs.SOLUTION: A power system S1 according to the present disclosure includes a power reception facility 3 that detects the value of connection point power at a connection point with respect to a power line K, a processing device 42 that derives a control command value for adjusting the connection point power to an adjustment target value, and a plurality of power conditioners 12 and 22 each of which controls output power on the basis of an optimization problem using the control command value. The processing device 42 includes a reception unit 422a that can receive the value of the connection point power from the power reception facility 3, a derivation unit 426 that derives the control command value through computation based on the received value of the connection point power and the adjustment target value, and a transmission unit 422b that transmits the derived control command value to each of the power conditioners 12 and 22. When the reception unit 422a cannot normally receive the value of the connection point power, the transmission unit 422b transmits, as the control command value, a set value corresponding to a control mode.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a power system connected to a power system and a processing device.

  Patent Document 1 discloses a plurality of solar cells, a plurality of power conditioners each connected to a solar cell, a plurality of power conditioners each connected to a storage battery, and a centralized management device that manages the plurality of power conditioners. An electric power system (photovoltaic power generation system) including the following is disclosed. In the conventional power system described in Patent Literature 1, the central management device sets a control command value (index) for controlling the output power of each power conditioner so that the power to be adjusted becomes a predetermined adjustment target value. Then, each power conditioner controls the output power in a distributed manner using the control command value (index). Thereby, power control is performed so that the power to be adjusted becomes a predetermined adjustment target value. As power control in this power system, performing peak cut control and reverse power flow avoidance control is disclosed. The power to be adjusted is the power at the connection point between the power system and the power system, and the adjustment target value is the target power for peak cut in peak cut control, and the target power for reverse power flow avoidance in reverse power flow avoidance control. is there.

International Publication No. WO 2017/150376

  In such a power system, it is necessary to transmit and receive signals between devices and between elements in each device by communication. However, Patent Document 1 does not consider a case where an abnormality occurs during such communication. Therefore, when an abnormality occurs in communication, the power system cannot properly perform power control using the control command value. For example, if the central management device cannot acquire the power to be adjusted due to a communication error, the control command value cannot be calculated. At this time, when the peak cut control is performed, a problem that the suppression of the power peak cannot be achieved occurs, or when the reverse power flow avoidance control is performed, the generation of the reverse power flow cannot be suppressed, and for example, the reverse power relay is operated. Problems. Therefore, in the conventional power system, when a communication error occurs, the power control using the control command value has to be stopped. From the above, in the conventional power system, there is still room for improvement in appropriately performing power control using the control command value.

  The power system and the processing device according to the present disclosure have been conceived in view of the above circumstances, and the purpose is to stop power control using a control command value even when an abnormality occurs in communication. It is another object of the present invention to provide a power system and a processing device that can be performed continuously without using a power system.

  A power system provided by the first aspect of the present disclosure is a power system connected to a power system and performing power control of a connection point power that is power at a connection point with the power system, wherein the connection point power And a processing device for deriving a control command value for setting the value of the connection point power to a set adjustment target value, each of which is connected to the connection point, and Based on an optimization problem using a control command value, based on a plurality of power control devices that control output power, the processing device, the processing device is capable of receiving the value of the connection point power from the detection device A device receiving unit, and a value of the connection point power received by the processing device receiving unit, and a deriving unit that derives the control command value by a calculation based on the adjustment target value according to a control mode for the power control. When, A processing device transmitting unit that transmits the control command value derived by the deriving unit to each of the plurality of power control devices, wherein the deriving unit is configured such that the processing device receiving unit sets the value of the connection point power. Is not normally received, a set value corresponding to the control mode is derived as the control command value.

  In a preferred embodiment of the power system, the plurality of power control devices include a power generation control device connected to a power generation device, the power generation control device, the power input from the power generation device Output is possible, and the control mode is a peak cut mode for suppressing a peak value of electric power input from the electric power system to the electric power system, and avoids a reverse power flow from the electric power system to the electric power system. For the reverse power flow avoidance mode, the deriving unit, as a set value according to the peak cut mode, derives a value that does not suppress the output power to the power generation control device, according to the reverse power flow avoidance mode As the set value, a value for causing the power generation control device to suppress the output power is derived.

  In a preferred embodiment of the power system, the plurality of power control devices further include a storage battery control device to which a storage battery is connected, and the storage battery control device controls charging and discharging of the storage battery. The deriving unit derives a value that does not cause the storage battery control device to charge the storage battery as a set value according to the peak cut mode, and sets the storage battery control device as a set value according to the reverse power flow avoidance mode. A value that does not discharge the storage battery is derived.

  In a preferred embodiment of the power system, each of the plurality of power control devices, a power control device receiving unit capable of receiving the control command value from the processing device, by calculating the optimization problem, An information processing unit that calculates an individual target value that is a target value of the output power, and an output control unit that controls the output power so that the value of the output power becomes the individual target value. The information processing unit causes the output control unit to stop outputting power when the power control device receiving unit cannot normally receive the control command value.

  In a preferred embodiment of the power system, the output control unit further includes an output power detection unit that detects a value of the output power, each of the plurality of power control devices, the output power detection unit Further comprising a power control device transmitting unit that transmits the value of the detected output power to the processing device, wherein the information processing unit is configured to perform a process when the power control device transmitting unit cannot normally transmit the value of the output power. And causing the output control unit to stop outputting power.

  In a preferred embodiment of the power system, the power system includes a terminal device capable of communicating with the processing device, the terminal device, an instruction unit that instructs the adjustment target value according to the control mode, A terminal device transmission unit that transmits the adjustment target value instructed by the instruction unit to the processing device, and the control mode does not cause the power generation control device to suppress the output power, and The storage battery control device further includes an emergency mode for performing power control so as not to charge and discharge the storage battery, wherein the processing device reception unit can receive the adjustment target value transmitted from the terminal device, and the derivation unit Operates in an emergency mode as the control mode when the processing device receiving unit cannot normally receive the adjustment target value.

  In a preferred embodiment of the power system, the storage battery control device further includes a state obtaining unit that obtains a charging rate of the storage battery and outputs the state of charge to the information processing unit of the storage battery control device. The information processing unit of the device uses the charging rate when calculating the individual target value, and causes the output control unit to stop outputting power when the charging rate is not input from the state obtaining unit.

  The processing device provided by the second aspect of the present disclosure causes a plurality of power control devices connected to the power system to set a value of a connection point power, which is power at a connection point with the power system, to an adjustment target value. By transmitting a control command value for, a processing device to control the output power based on the optimization problem using the control command value to each of the plurality of power control device, the value of the connection point power A processing device receiving unit capable of receiving the value of the connection point power from a detection device that detects the value of the connection point power received by the processing device reception unit, and the adjustment target according to a set control mode. By a calculation based on a value, a deriving unit that derives the control command value, and a processing device transmitting unit that transmits the control command value derived by the deriving unit to each of the plurality of power control devices, , The derivation unit , If the processor receiving unit can not receive normally the value of the connection point power, and wherein the deriving the set value in accordance with the control mode as the control command value.

  According to the power system of the present disclosure, for example, due to a communication abnormality between the processing device and the detection device, the processing device cannot normally receive the connection point power from the detection device and cannot calculate the control command value. Even in such a case, by deriving a set value according to the control mode as a control command value and transmitting this to each power control device, power control using the control command value can be continued.

It is a figure showing the whole electric power system composition concerning an embodiment. It is a figure showing the functional composition about power control of the power system concerning an embodiment. It is a figure which shows the relationship between a control command value and individual output power in the power conditioner to which the solar cell was connected. It is a figure which shows the relationship between a control command value and individual output power in the power conditioner to which the storage battery was connected. FIG. 4 is a diagram illustrating a situation where power control is normally performed in a schedule mode. FIG. 6 is a diagram showing a situation when a communication error occurs in the situation shown in FIG. 5. FIG. 7 is a diagram illustrating a case where power control of a conventional power system is performed in a situation where a communication abnormality illustrated in FIG. 6 occurs. FIG. 7 is a diagram illustrating a case where power control of the power system according to the present disclosure is performed in a situation where the communication abnormality illustrated in FIG. 6 occurs.

  Preferred embodiments of a power system and a processing device according to the present disclosure will be described below with reference to the drawings.

  FIG. 1 shows an overall configuration of a power system S1 according to the embodiment. The power system S1 includes a power line 90, a power load L, network hubs H1 and H2, a plurality of solar cells 11, a plurality of power conditioners 12, a plurality of storage batteries 21, a plurality of power conditioners 22, a power receiving facility 3, and a terminal device 41. And a processing device 42. In FIG. 1, the power conditioner is described as PCS. In FIG. 1, the power network is indicated by a thick solid line, and the information network is indicated by a thin solid line. The information network may be constructed by wireless communication or by wired communication, and wireless communication and wired communication may be appropriately used between the devices. In the following description, when power is output from the power system S1 to the power system K, that is, when reverse power flows, the power at the connection point between the power system S1 and the power system K has a positive value. Shall be. On the other hand, when power is output from the power system K to the power system S1, the power at the connection point has a negative value.

  The power line 90 is for constructing a power network in the power system S1. The power line 90 is provided between the power receiving facility 3 and the power system K, between the power receiving facility 3 and the power load L, between the power receiving facility 3 and each of the power conditioners 12 and 22, each of the solar cells 11 and each of the power They are arranged between the conditioner 12 and between the storage batteries 21 and the power conditioners 22, respectively, and are electrically connected to each other.

  The power load L consumes the supplied power. The power load L is supplied with power from the power receiving facility 3. Examples of the power load L include a factory and a general home. Note that the power system S1 does not have to include the power load L.

  Each of the network hubs H1 and H2 is a device in which terminals (ports) for connecting a plurality of communication cables are arranged. Signals flowing from one communication cable are transmitted to another communication cable to allow mutual communication. The network hub H1 is connected to a WAN (Wide Area Network) 81. The network hub H2 is connected to a LAN (Local Area Network) 82.

  Each of the plurality of solar cells 11 converts sunlight energy into electric energy. Each solar cell 11 includes a plurality of solar cell panels connected in series and in parallel. The solar cell panel is, for example, a panel in which a plurality of solar cells made of a semiconductor such as silicon are connected and protected with a resin, a tempered glass, or the like so as to be used outdoors. Each solar cell 11 outputs the generated power (DC power) to each power conditioner 12. In the present embodiment, the power system S1 includes n solar cells 11. Note that n is a positive integer. In the present embodiment, each solar cell 11 corresponds to a “power generation device” described in the claims.

  Each of the plurality of power conditioners 12 converts the power (DC power) generated by each solar cell 11 into AC power and outputs the AC power. In the present embodiment, one power conditioner 12 is connected to one solar cell 11 in the power system S1. Therefore, the power system S1 includes n power conditioners 12. Note that a plurality of solar cells 11 may be connected to one power conditioner 12. Each power conditioner 12 controls the output power so that the output power of the own device becomes a predetermined target value. Each power conditioner 12 can perform maximum power point follow-up control (MPPT control). When the MPPT control is performed, the power conditioner 12 outputs the power generated by the solar cell 11 without suppressing it. In the present embodiment, each power conditioner 12 corresponds to a “power control device” or a “power generation control device” in the claims.

  Each of the plurality of storage batteries 21 is a battery that can be repeatedly charged and discharged. Each storage battery 21 is a secondary battery such as a lithium ion battery, a nickel hydride battery, a nickel cadmium battery, and a lead storage battery. Further, a capacitor such as an electric double layer capacitor may be used. Each storage battery 21 discharges the stored power and supplies DC power to the power conditioner 22. In the present embodiment, the power system S1 includes m storage batteries 21. Here, m is a positive integer.

  Each of the plurality of power conditioners 22 controls charging and discharging of each storage battery 21. In the power system S <b> 1 of the present embodiment, one power conditioner 22 is connected to one storage battery 21. Therefore, the power system S1 includes m power conditioners 22. Note that a plurality of storage batteries 21 may be connected to one power conditioner 22. Each power conditioner 22 discharges each storage battery 21 by converting DC power input from each storage battery 21 into AC power and outputting the AC power. Each power conditioner 22 converts the input AC power into DC power and supplies the DC power to each storage battery 21, thereby charging each storage battery 21. Each power conditioner 22 controls the output power so that the output power of its own device becomes a predetermined target value. In the present embodiment, each power conditioner 22 corresponds to a “power control device” and a “storage battery control device” in the claims.

_Assuming that the active power output from each power conditioner 12 is P _PVi ^out and the reactive power is Q _PVi ^out , the complex power of P _PVi ^out + j · Q _PVi ^out is output from each power conditioner 12. Here, i is a positive integer from 1 to n, and P _PV1 ^out + j · Q _PV1 ^out is the value of the complex power output from the first power conditioner 12, and P _PVn ^out + j · Q _PVn ^out is the value of the complex power output from the n-th power conditioner 12. Assuming that the active power output from each power conditioner 22 is P _Bk ^out and the reactive power is Q _Bk ^out , the complex power of P _Bk ^out + j · Q _Bk ^out is output from each power conditioner 22. Here, k is a positive integer from 1 to m, and P _B1 ^out + j · Q _B1 ^out is the value of the complex power output from the first power conditioner 22, and P _Bm ^out + j · Q _Bm ^out is the value of the complex power output from the m-th power conditioner 22. Thus, a plurality of power conditioners 12, 22, the complex power of the sum ^{_{(Σ i P PVi out + Σ}} k P Bk out) + j (Σ it Q PVi out + Σ k Q Bk out) is outputted. In this embodiment, the output control of the reactive powers Q _PVi ^out and Q _Bk ^out mainly used for suppressing the voltage fluctuation at the connection point is not particularly considered. That is, the output powers controlled by the power conditioners 12 and 22 (hereinafter, also referred to as “individual output powers”) are the active powers P _PVi ^out and P _Bk ^out , respectively. Therefore, _assuming that the individual output power of each power conditioner 12 is P _PVi ^out , the individual output power of each power conditioner 22 is P _Bk ^out , and the power consumption P _L of the power load L is the power at the connection point (hereinafter, “connection”). The “point power”) is the sum of the individual output powers P _PVi ^out , P _Bk ^{out of the} power conditioners 12 and 22 and the power consumption PL of the power load L ( _{Ｌ i} P _PVi ^out + Σ _k P _Bk ^out −P _L ).

  The power receiving facility 3 includes a switchboard and a distribution board. The power receiving facility 3 also includes various protection devices for connecting to the power system K. For example, when the power system S1 is a system in which reverse power flow to the power system K is prohibited, a reverse power relay is included as a protection device. The power receiving facility 3 receives power supplied from the power system K and each of the power conditioners 12 and 22. The power receiving facility 3 supplies the received power to the power load L. When receiving power from each of the power conditioners 12, 22, the power receiving facility 3 supplies the power received from each of the power conditioners 12, 22 to the power load L with priority over the power received from the power system K. I do. Further, the power receiving facility 3 detects power (connection point power) at a connection point between the power system S1 and the power system K. The value of the connection point power detected by the power receiving facility 3 is referred to as a connection point power detection value. In the present embodiment, the power receiving facility 3 corresponds to a “detection device” described in the claims.

  The power receiving facility 3 is connected to the LAN 82, and is connected to the network hub H2 via the LAN 82. Therefore, the power receiving facility 3 can communicate with each device connected to the network hub H2. In the present embodiment, the power receiving equipment 3 transmits, for example, the detected connection point power detection value to the processing device 42 via the LAN 82 and the network hub H2.

  The terminal device 41 is a user interface in the power system S1. The user of the power system S1 uses the terminal device 41 to perform various setting operations of the power system S1 and check various information of the power system S1. The terminal device 41 is connected to the WAN 81, and is connected to the network hub H1 via the WAN 81. Therefore, the terminal device 41 can communicate with each device connected to the network hub H1.

The processing device 42 performs power control of the power system S1 in cooperation with the power conditioners 12 and 22. The processing device 42 derives a control command value for performing power control of the power system S1. Details of deriving the control command value will be described later. In the present embodiment, as the control command value to derive a control command value pr _PV a control command value pr _B. The control command value pr _PV is information for causing each power conditioner 12 to calculate an individual target value which is a target value of the individual output power. The control command value pr _B is information for causing each power conditioner 22 to calculate an individual target value which is a target value of the individual output power. Further, the control command value pr _B is also information for determining how much the storage battery 21 is charged or discharged. Processor 42 transmits the derived control command value pr _PV each power conditioner 12, and transmits the derived control command value pr _B to the power conditioner 12, 22.

  One of a plurality of control modes is set in the processing device 42, and a control command value is derived according to the set control mode. The control modes in the present embodiment include, for example, a normal mode, a schedule mode, an output suppression mode, a peak cut mode, a peak cut auxiliary mode, a reverse power flow avoidance mode, a reverse power flow emergency avoidance mode, and an emergency mode. Details of these control modes will be described later. In the present embodiment, among these control modes, a normal mode, a schedule mode, an output suppression mode, a peak cut mode, and a reverse power flow avoidance mode can be selected and set by a user. The device 42 automatically sets as appropriate according to the status of the power system S1. The control mode that can be selected and set by the user and the control mode that is automatically set are not limited to those described above. For example, all the control modes may be configured to be selectable by the user. Further, as the control mode, all of the above-mentioned control modes may be settable, or only a part of the control modes may be settable.

  In the power system S1 configured as described above, based on the control command value derived by the processing device 42, each of the power conditioners 12, 22 autonomously controls the individual output power, and as the power system S1, The power control is performed so as to achieve the purpose corresponding to the set control mode. Therefore, in the power system S1, the processing device 42 derives a control command value according to the set control mode, and transmits the derived control command value to each of the power conditioners 12 and 22. Each of the power conditioners 12 and 22 calculates an individual target value based on the control command value received from the processing device 42 and controls the individual output power to be the individual target value. In the present embodiment, as described above, the plurality of control modes include, for example, a normal mode, a schedule mode, an emergency mode, an output suppression mode, a peak cut mode, a peak cut auxiliary mode, a reverse power flow avoidance mode, and a reverse power flow emergency mode. There is an evasion mode. The purpose according to each of these control modes is as follows.

  The normal mode is a control mode in which the power control of the power system S1 in the normal state is specified. While the normal mode is set, each power conditioner 12 performs MPPT control without suppressing the output power, and each power conditioner 22 controls the storage battery in accordance with the state of the connected storage battery 21. Power control is performed so as to charge / discharge 21. For example, each power conditioner 22 discharges the storage battery 21 based on the SOC (States of Charge) of the storage battery 21 when the storage battery 21 has sufficient power stored therein, and the power of the storage battery 21 becomes insufficient. In this case, the storage battery 21 is charged. Further, depending on the time period, for example, the storage battery 21 may be discharged in the daytime and the storage battery 21 may be charged in the nighttime.

  The schedule mode is a control mode for controlling the output value freely set by the user for each predetermined time period. Note that the predetermined time period is a predetermined period in which one day is divided into a plurality of times. For example, when the day is divided into 30 minutes, it can be set for every 48 time periods. The predetermined time period is not limited to the above example, and may be divided into time periods such as morning, noon, evening, evening, and late at night, and may be divided into predetermined time periods on a weekly basis instead of on a daily basis. May be divided. While the schedule mode is set, power control is performed so that the output power of the power system S1 becomes the schedule target value set by the user. The schedule target value sets the value of the output power of the power system S1 for each of the predetermined time zones. In the present embodiment, a case is described in which a target value for the output power of the power system S1 is set as the schedule target value, but the present invention is not limited to this. For example, as the schedule target value, a target value for the total value of the output powers of the plurality of power conditioners 12 to which the solar cells 11 are connected may be set, or the target value of the plurality of power conditioners 22 to which the storage battery 21 is connected may be set. A target value for the total output power may be set, or all of these target values may be set.

  The output suppression mode is a control mode for the purpose of suppressing output power in the power system S1. When the number of power systems connected to the power system K increases, the supply of power to the power system K may be excessive compared to demand. In order to eliminate this oversupply state, an electric power company or the like instructs each electric power system to suppress individual output power. Therefore, while the output suppression mode is set, power control is performed so that the connection point power detection value does not exceed the suppression target value in order to comply with the output suppression instruction from the power company. For example, a suppression command value is presented as an output suppression instruction from a power company, and a suppression target value is set based on the suppression command value. When the suppression command value is a value that specifies the upper limit of the output power, the suppression command value is set as the suppression target value. Alternatively, when the suppression command value is the output suppression rate [%], for example, the upper limit value of the output power is calculated based on the output suppression rate [%] and the sum of the rated outputs of the power conditioners 12 and 22. This is set as the suppression target value. For example, when a command with an output suppression rate of 20% is acquired, 80% (= 100−20) of the total of the rated outputs of the power conditioners 12 and 22 is calculated as the upper limit value of the output power, and this is suppressed. Set as target value.

  The peak cut mode is a control mode for the purpose of suppressing a power peak in the power system S1. Since the basic electricity rate is determined by the peak value of purchased power for one year, reduction of the basic electricity rate can be expected by suppressing the power peak. Therefore, while the peak cut mode is set, the power control is performed so that the detected value of the connection point power does not exceed the peak cut target value, and the rise of the power peak is suppressed.

  The peak cut assist mode is a control mode for the purpose of suppressing the power peak similarly to the peak cut mode. In particular, when the power system S1 includes a well-known demand monitoring device, the peak cut auxiliary mode is linked with the demand monitoring device. This is a control mode for suppressing the power peak. The demand monitoring device is a device that monitors a demand value that determines a basic electricity rate and is used to reduce an electricity rate. The demand value is assumed to be the average demand power for each demand time period (generally 30 minutes), but may be the cumulative demand power per demand time period. The demand monitoring device predicts demand at the end of the demand time period, and when the predicted demand value (hereinafter, referred to as “predicted demand value”) is likely to exceed a preset target value (target demand value). Give an alarm. At this time, an alarm level is specified based on the predicted demand value and the target demand value, and an alarm is issued based on the alarm level. Therefore, while the peak cut assist mode is set, the power stored in the storage battery 21 is supplied to the power load L in response to an alarm signal based on the alarm level from the demand monitoring device, so that the power is supplied from the power system K. Power is controlled so as to reduce the required power and suppress the maximum demand value.

  The reverse power flow avoiding mode is a control mode for the purpose of avoiding the generation of the reverse power flow. For example, when the power system S1 is a self-consumption type system, reverse power flow is prohibited. In addition, in the power system S1 in which such reverse power flow is prohibited, it is necessary to install a reverse power relay at a connection point with the power system K. The reverse power relay is a type of relay, and disconnects the power system S1 from the power system K when detecting the occurrence of reverse power flow. Therefore, while the reverse power flow avoidance mode is set, power control is performed so that the detected power at the connection point does not exceed the reverse power flow avoidance target value, thereby avoiding the occurrence of reverse power flow.

  The reverse power flow emergency avoidance mode is a control mode for the purpose of avoiding the generation of the reverse power flow similarly to the reverse power flow avoidance mode, and in particular, is a control mode in which power control is performed using the auxiliary relay 33 described later. . While the reverse power flow emergency avoidance mode is set, power control is performed in cooperation with the auxiliary relay 33 so as to avoid the occurrence of reverse power flow.

  The emergency mode is a control mode for ensuring power control of the power system S1 in an emergency. For example, when the schedule mode is set even though the user has not set the schedule, the power control of the power system S1 cannot be performed properly. Therefore, while the emergency mode is set, each power conditioner 12 performs MPPT control without suppressing the output power, and each power conditioner 22 performs charging and discharging of the connected storage battery 21. Power control so that there is no

  FIG. 2 shows a functional configuration of a control system related to power control of the power system S1 shown in FIG. In FIG. 2, the power conditioner is described as PCS as in FIG. Also in FIG. 2, the power network is shown by a thick solid line, and the information network is shown by a thin solid line. The information network may be constructed by wireless communication or wired communication unless otherwise specified. The operation of each component described below is described assuming that communication between devices and between components inside each device is normal. The case where an abnormality has occurred in communication will be described later.

  As shown in FIG. 2, each power conditioner 12 includes a first communication unit 121, a second communication unit 122, an information processing unit 124, and an output control unit 125 as a functional configuration of a control system. In the present embodiment, the first communication unit 121, the second communication unit 122, the information processing unit 124, and the output control unit 125 are connected to a communication bus 129 as shown in FIG. Thus, communication within each power conditioner 12 is performed. Note that the communication network in each power conditioner 12 is not limited to a bus-type connection. Further, the first communication unit 121 and the second communication unit 122 may be configured by one module, or may be configured by different modules.

  The first communication unit 121 is connected to the network hub H1, and performs communication via the network hub H1. As shown in FIG. 2, the first communication unit 121 includes a receiving unit 121a and a transmitting unit 121b. The receiving unit 121a receives a signal from each device connected to the network hub H1. The transmission unit 121b transmits a signal to each device connected to the network hub H1.

  The second communication unit 122 is connected to the network hub H2 and performs communication via the network hub H2. As shown in FIG. 2, the second communication unit 122 includes a reception unit 122a and a transmission unit 122b. The receiving unit 122a receives a signal from each device connected to the network hub H2. The transmission unit 122b transmits a signal to each device connected to the network hub H2.

  In the present embodiment, a combination of the receiving unit 121a of the first communication unit 121 and the receiving unit 122a of the second communication unit 122 corresponds to a “power control device receiving unit” described in the claims. A combination of the transmission unit 121b of the first communication unit 121 and the transmission unit 122b of the second communication unit 122 corresponds to a “power control device transmission unit” described in the claims.

The information processing section 124 performs various types of information processing in each power conditioner 12. The information processing unit 124 calculates a target value (individual target value) of the output power (individual output power) of the own device (the power conditioner 12) based on the control command value pr _PV derived by the processing device 42. Specifically, the information processing section 124 calculates the individual target value P _PVi ^ref by solving the constrained optimization problem shown in the following equation (1). The following equation (1a) in the following equation (1) indicates an evaluation function in the optimization problem. Further, the following equations (1b) and (1c) in the following equation (1) respectively indicate the constraints in the optimization problem. In the constraint, the following (1b) formula is limited by the rated output P _PVi ^lmt of the power conditioner 12, the following (1c) equation is an output current limitation of the power conditioner 12. Note that, instead of the output current constraint of each power conditioner 12 shown in the following equation (1c), the rated capacity constraint of the power conditioner 12 shown in the following equation (1d) may be used.

In the above formula (1a), w _PVi represents a weight relating to the active power suppression of the i-th power conditioner 12, and is a design value. Pφ _i indicates a design parameter (hereinafter referred to as a “priority parameter”) indicating whether or not the suppression of the individual output power P _PVi ^out of the i-th power conditioner 12 is prioritized. is there. The smaller the priority parameter P.PHI _i, by reducing the amount of charge of each battery 21, easily separate output power P _PVi ^out is suppressed. On the other hand, increasing the priority parameter P.PHI _i, to increase the charge amount of each battery 21, the individual output power P _PVi ^out is not easily suppressed. Therefore, it can be said that the priority parameter Pφ _i is a design parameter indicating whether or not the charging of each storage battery 21 has priority. Further, a pseudo output limit of the individual output power P _PVi ^out of the i-th power conditioner 12 is set by the priority parameter Pφ _i , separately from the output limit by the rated output of the i-th power conditioner 12. It is thought that it is. Therefore, the priority parameter Pφ _i can be said to be a pseudo effective output limit. The setting of the weight w _PVi and the priority parameter Pφ _i can be changed by the user.

In the above (1b) Formula, P _PVi ^lmt represents the rated output of the i-th power conditioner 12 (output limit). Therefore, the above equation (1b) limits the calculated individual target value P _PVi ^ref so as not to exceed the rated output P _PVi ^lmt .

In the above (1c) formula, Q _PVi the i th reactive power of the power conditioner 12, S _PVi ^d is the i-th output possible maximum apparent power of the power conditioner 12, V ₀ is the interconnection point in time of design And the reference voltage V _PVi represents the voltage at the interconnection point in the i-th power conditioner 12, respectively.

In the present embodiment, a value calculated by the following equation (2) is used as the weight w _PVi (see the above equation (1a)) regarding the active power suppression of the i-th power conditioner 12. In the following equation (2), pr _PV ^lmt indicates the control command value limit. The control command value limit pr _PV ^lmt is a control command value for ^setting the individual output power P _PVi ^out to 0, that is, a control command value for suppressing the individual output power P _PVi ^out by 100%. Also, P _PVi ^lmt is a rated output of each power conditioner 12. Instead of the rated output P _PVi ^lmt of the power conditioner 12, it may be used pseudo effective output limit P.PHI _i. That is, a value calculated by the following equation (2 ′) may be used. Alternatively, the plurality of power conditioners 12 may all use the same weight w _PVi regarding active power suppression.
w _PVi = pr _PV ^lmt / (2 × P _PVi ^lmt ) (2)
w _PVi = pr _PV ^lmt / (2 × Pφ _i ) (2 ′)

FIG. 3 shows the relationship between the control command value pr _PV and the individual output power P _PVi ^out when the weight w _PVi relating to the active power suppression of each power conditioner 12 calculated using the above equation (2) is used. ing. Incidentally, in FIG. 3 shows for each rated output P _PVi ^lmt different three power conditioner 12 to one another. In the present embodiment, since the individual output power P _PVi ^out is controlled to be the individual target value P _PVi ^ref calculated by the information processing unit 124, the same figure shows the control command value pr _PV and the individual target value P _PVi ^out . It can be said that it indicates the relationship with _PVi ^ref . In FIG. 3, the control command value limit pr _PV ^lmt is ^set to 100. In Figure 3, shows the rated output P _PVi ^lmt is 500kW solid, those rated output P _PVi ^lmt is 250kW dashed rated output P _PVi ^lmt is those 100kW by a dashed line.

As shown in FIG. 3, each time the control command value pr _PV is 20 rises between 0 and 100 (the control command value limit pr _PV ^lmt), when the rated output P _PVi ^lmt is 500kW 100 kW, the rated output P _PVi ^lmt If is 250 kW 50 kW, it is reduced by 20kW when the rated output P _PVi ^lmt is 100 kW. This would have reduced by 20% of the rated output P _PVi ^lmt of the power conditioner 12. That is, by suppressing the individual output power P _PVi ^out a percentage of the rated output P _PVi ^lmt of the power conditioner 12. Further, in each of the power conditioners 12, when the control command value pr _PV is equal to the control command value limit pr _PV ^lmt , the individual output power P _PVi ^out is 0. That is, it is suppressed by 100%. Further, when the control command value pr _PV is 0, the individual output power P _PVi ^out is the rated output P _PVi ^lmt . That is, the maximum output power is output. Then, as shown in FIG. 3, when the control command value pr _PV is between 0 and the control command value limit pr _PV ^lmt (100), the individual output power P _PVi ^out of each power conditioner 12 changes linearly. I have. Each power conditioner 12, can not output more power than its rated output P _PVi ^lmt, when the control command value pr _PV is a negative value, as shown in FIG. 3, a constant value (the rated output P It has become a _PVi ^lmt). From the above, in setting the weight w _PVi about active power suppression, by using the equation (2), with the change in the control command value pr _PV, as a percentage of the rated output P _PVi ^lmt of the power conditioner 12 , The individual output power P _PVi ^out can be suppressed. Therefore, a plurality of the power conditioner 12, be different their rated output P _PVi ^lmt, when the control command value pr _PV is control command value limit pr _PV ^lmt, the output of the individual output power P _PVi ^out 100 %. In the case of using the same value as the weight w _PVi about active power suppression, as even with different rated output P _PVi ^lmt of the power conditioner 12, the same amount by individually output power P _PVi ^out uniformly decreases Can be configured.

  The output control unit 125 controls the output power of each power conditioner 12. In the present embodiment, the output control unit 125 controls the individual output power to the individual target value calculated by the information processing unit 124. As shown in FIG. 2, the output control unit 125 includes an inverter circuit 125a, a transformer 125b, a detection circuit 125c, a control circuit 125d, and the like.

  In the output control unit 125, the inverter circuit 125a converts DC power input from the solar cell 11 into AC power synchronized with the power system K. Transformer 125b steps up (or steps down) the AC voltage output from inverter circuit 125a. The detection circuit 125c detects the output power of each power conditioner 12. The control circuit 125d controls the inverter circuit 125a and the like. The control circuit 125d detects, when an operation abnormality has occurred in the output control section 125, the abnormality. The control circuit 125d generates a control signal (for example, a PWM signal) for setting the individual output power to the individual target value based on the output power detected by the detection circuit 125c. Then, the generated control signal is input to the inverter circuit 125a. As described above, in each power conditioner 12, the output control unit 125 controls the individual output power to be the individual target value. The configuration of each output control unit 125 is not limited to the above. In the present embodiment, the detection circuit 125c corresponds to an “output power detection unit” described in the claims.

In each power conditioner 12, when the receiving unit 122a receives the control command value pr _PV from the processing device 42, the second communication unit 122 outputs the received control command value pr _PV to the information processing unit 124. The information processing unit 124 calculates individual target value by using the input control command value pr _PV, and outputs the calculated individual target value to the output control unit 125. The output control unit 125 controls the individual output power based on the input individual target value.

  In each power conditioner 12, the output control unit 125 outputs the value of the individual output power detected by the detection circuit 125c to the first communication unit 121 and the second communication unit 122. The first communication unit 121 transmits the value of the input individual output power to the terminal device 41 by the transmission unit 121b via the network hub H1 and the WAN 81. In addition, the second communication unit 122 transmits the value of the input individual output power to the processing device 42 by the transmission unit 122b via the network hub H2.

  In each power conditioner 12, when the output control unit 125 detects an operation abnormality of the output control unit 125 by the control circuit 125d, a signal indicating the operation abnormality (hereinafter, referred to as “operation abnormality signal”) is first. Output to the communication unit 121. The first communication unit 121 transmits the input operation abnormality signal to the terminal device 41 via the network hub H1 and the WAN 81 by the transmission unit 121b.

  As shown in FIG. 2, each power conditioner 22 includes a first communication unit 221, a second communication unit 222, a state acquisition unit 223, an information processing unit 224, and an output control unit 225 as a functional configuration of a control system. I have. In the present embodiment, the first communication unit 221, the second communication unit 222, the state acquisition unit 223, the information processing unit 224, and the output control unit 225 are connected to a communication bus 229 as shown in FIG. Communication within each power conditioner 22 is performed via the communication bus 229. Note that the communication network in each power conditioner 22 is not limited to a bus-type connection. In addition, the first communication unit 221 and the second communication unit 222 may be configured by one module, or may be configured by different modules.

  The first communication unit 221 is connected to the network hub H1, and performs communication via the network hub H1. As shown in FIG. 2, the first communication unit 221 includes a reception unit 221a and a transmission unit 221b. The receiving unit 221a receives a signal from each device connected to the network hub H1. The transmission unit 221b transmits a signal to each device connected to the network hub H1.

  The second communication unit 222 is connected to the network hub H2 and performs communication via the network hub H2. As shown in FIG. 2, the second communication unit 222 includes a reception unit 222a and a transmission unit 222b. The receiving unit 222a receives a signal from each device connected to the network hub H2. The transmission unit 222b transmits a signal to each device connected to the network hub H2.

  In the present embodiment, a combination of the receiving unit 221a of the first communication unit 221 and the receiving unit 222a of the second communication unit 222 corresponds to a “power control device receiving unit” described in the claims. A combination of the transmission unit 221b of the first communication unit 221 and the transmission unit 122b of the second communication unit 222 corresponds to a “power control device transmission unit” described in the claims.

  The state acquisition unit 223 acquires the state of the connected storage battery 21. In the present embodiment, the state acquisition unit 223 acquires, for example, the SOC (States of Charge) of the storage battery 21 and the maximum capacity of the storage battery 21. The state acquisition unit 223 outputs the acquired state of the storage battery 21 to the information processing unit 224.

The information processing unit 224 performs various types of information processing in each power conditioner 22. The information processing unit 224 calculates a target value (individual target value) of the output power (individual output power) of the own device (the power conditioner 22) based on the control command value pr _B derived by the processing device 42. Specifically, the information processing unit 224 calculates the individual target value P _Bk ^ref by solving a constrained optimization problem represented by the following equation (3). The following equation (3a) in the following equation (3) indicates an evaluation function in the optimization problem. Further, the following equations (3b) to (3e) in the following equation (3) respectively indicate the constraints in the optimization problem. In the constraint conditions, the following equation (3b) is a constraint based on the rated output of each power conditioner 22, the following equation (3c) is a C rate constraint of the storage battery 21, and the following equation (3d) is the remaining capacity of each storage battery 21. Equation (3e) below is an output current constraint of each power conditioner 22. The C rate is a relative ratio of the current at the time of charging or discharging to the total capacity of the storage battery, and is defined as 1C when the total capacity of the storage battery is charged or discharged in one hour. The C rate in the present embodiment includes a charging-side C rate and a discharging-side C rate. The C rate on the charging side is a C rate for the current when each storage battery 21 is charged, and is referred to as a “charging rate” in the following description. The C rate on the discharge side is a C rate with respect to the current when each storage battery 21 is discharged, and is referred to as a “discharge rate” in the following description. Instead of the output current constraint of each power conditioner 22 shown in the following equation (3e), the rated capacity constraint of the power conditioner 22 shown in the following equation (3f) may be used.

In the above equation (3a), w _Bk represents a weight related to the active power of the k-th power conditioner 22. The weight w _Bk can be set by the user. w _SOCk represents a weight corresponding to the SOC of the k-th storage battery 21. This weight w _SOCk is calculated by the following equation (4). In the following equation (4), A _SOC is an offset of weight w _SOCk , K _SOC is a gain of weight w _SOCk , s _sw is an on / off switch of weight w _SOCk (for example, 1 when on, 0 when off), SOC _k indicates the current SOC of the k-th storage battery 21, and SOC _d indicates the reference SOC.

In the above equation (3b), P _Bk ^lmt represents the rated output (output limit) of each power conditioner 22. Therefore, the above equation (3b) restricts the calculated individual target value P _Bk ^ref so as not to exceed the rated output P _Bk ^lmt .

In the above equation (3c), P _SMk ^lmt represents the rated charging output of the k-th storage battery 21. When the charging rate is C _rate ^M and the rated capacity of the k-th storage battery 21 is WH _S ^lmt. , −C _rate ^M × WH _S ^lmt . The charge rated output P _SMk ^lmt of the k-th storage battery 21 is determined by considering the correction of the storage battery charge amount according to the SOC shown in the following equation (5), where SOC _C is the correction start SOC and ^cMAX is the SOC charge limit threshold. ing. The battery charge amount correction is configured to perform a normal operation until the correction start SOC, and to linearly correct the output so that the output becomes zero at the SOC upper limit from the correction start SOC to the SOC upper limit. are doing. P _SPk ^lmt represents the discharge rated output of the k-th battery 21, the discharge rate and C _rate ^P, the rated capacity of the k-th battery 21 when the ^{_{WH S lmt, C rate P ×}} WH S ^Required by ^lmt . Therefore, in the above equation (3c), the calculated individual target value P _Bk ^ref falls within the range between the rated charging output and the rated discharging power defined based on the set C rate (charging rate and discharging rate). It is restricted to fit in. That is, due to the constraint by the above equation (3c), control is performed so that the value obtained by dividing the output current (individual output power P _Bk ^out ) of each power conditioner 22 by the rated capacity of the storage battery 21 does not exceed the set C rate. Have been. Therefore, it can be said that the C rate is a characteristic value for limiting the output current (individual output power P _Bk ^out ) in each power conditioner 22.

In the above equation (3d), α _k and β _k represent adjustment parameters that can be adjusted according to the remaining amount of the k-th storage battery 21. For example, when the charging rate SOC _k of the k-th storage battery 21 is 90% or more, by setting α _k to 0 and β _k to P _Bk ^lmt , it is possible to limit the discharge to only the discharge according to the above equation (3d). . When the charging rate SOC _k of the k-th storage battery 21 is 10% or less, α _k is set to −P _Bk ^lmt and β _k is set to 0, so that only charging is performed according to the above equation (3d). it can. Further, when the charging rate SOC _k of the k-th storage battery is between these (more than 10% and less than 90%), by setting α _k to −P _Bk ^lmt and β _k to P _Bk ^lmt , the charging is also completed. It can be limited to also perform discharge.

In the above equation (3e), Q _Bk is the reactive power of the k-th power conditioner 22, S _Bk ^d is the maximum apparent power that can be output from the k-th power conditioner 22, and V ₀ is the interconnection point at the time of design. The reference voltage V _Bk represents the voltage at the interconnection point in the k-th power conditioner 22.

In the present embodiment, a value calculated by the following equation (6) is used as the weight w _Bk (see the above equation (3a)) regarding the active power of the k-th power conditioner 22. In the following equation (6), pr _B ^lmt indicates the control command value limit of the control command value pr _B. The control command value limit pr _B ^lmt is a control command value for charging and discharging each storage battery 21 with the maximum output power, that is, the individual output power P _Bk ^out is ^charged and discharged at 100% of the rated output P _Bk ^lmt. This is the control command value when performing. In addition, w _SOCk indicates a weight corresponding to the SOC of the k-th storage battery 21, and P _Bk ^max indicates the maximum output power (hereinafter, referred to as “B”) in consideration of various restrictions on the k-th storage battery 21. This is referred to as “constrained maximum output”). The restricted maximum output P _Bk ^max is based on the charge rated output P _SMk ^{lmt of} the k-th storage battery 21, the discharge rated output P _SPk ^lmt of the k-th storage battery 21, and the rated output P _Bk ^lmt of the k-th power conditioner 22. Is set. Specifically, compared with the positive and negative values a value obtained by inverting the sign of the discharge rated output P _SPk ^lmt charging rated output P _SMk ^lmt, seek whichever is larger. Then, the larger value is compared with the value of the rated output P _Bk ^lmt , and the smaller value is set as the restricted maximum output P _Bk ^max . Note that the weights w _Bk relating to the same active power may be used in the plurality of power conditioners 22.
w _Bk = pr _B ^lmt / (2 × w _SOCk × P _Bk ^max ) (6)

FIG. 4 shows the relationship between the control command value pr _B and the individual output power P _Bk ^out when the weight w _Bk regarding the active power of the k-th power conditioner 22 calculated using the above equation (6) is used. Is shown. FIG. 4 shows three power conditioners 22 having different rated outputs P _Bk ^lmt . In the present embodiment, the k-th power conditioner 22 charges the k-th storage battery 21 when the individual output power P _Bk ^out has a negative value, and charges the k-th storage battery 21 when the individual output power P _Bk ^out has a positive value. Is discharged. Also, since the individual output power P _Bk ^out is controlled to be the individual target value P _Bk ^ref calculated by the information processing unit 224, the figure shows the relationship between the control command value pr _B and the individual target value P _Bk ^ref . It can be said that it shows a relationship. In FIG. 4, the control command value limit pr _B ^lmt is ^set to 100. In FIG. 4, the one with a rated output P _Bk ^lmt of 500 kW is shown by a solid line, the one with a rated output P _Bk ^lmt of 250 kW is shown by a broken line, and the one with a rated output P _Bk ^lmt of 100 kW is shown by a dashed line.

As shown in FIG. 4, for each control command value pr _B is to 20 increase between -100 (control command value limit pr _B ^lmt what has a negative value) from 100 (the control command value limit pr _B ^lmt) The rated output P _Bk ^{lmt decreases} by 100 kW when the rated output is 500 kW, decreases by 50 kW when the rated output P _Bk ^lmt is 250 kW, and decreases by 20 kW when the rated output P _Bk ^lmt is 100 kW. This means that the rated output P _Bk ^lmt of each power conditioner 22 is reduced by 20%. That is, the individual output power P _Bk ^out is controlled at a ratio to the rated output P _Bk ^lmt of each power conditioner 22. Therefore, even with the same control command value pr _B change amount, the charge / discharge amount of each storage battery 21 changes according to the rated output P _Bk ^lmt of each power conditioner 22. When the control command value pr _B is a value ^obtained by ^{setting the} control command value limit pr _B ^lmt to a negative value (−pr _B ^lmt ), each of the power conditioners 22 has the same value as the rated output P _Bk ^lmt . The storage battery 21 is discharged with the individual output power P _Bk ^out . On the other hand, when the control command value pr _B is the control command value limit pr _B ^lmt , the storage battery 21 is charged with the individual output power P _Bk ^out having the same value as the rated output P _Bk ^lmt . That is, the storage battery 21 is charged and discharged with the maximum output power. Further, when the control command value pr _B is 0, the individual output power P _Bk ^out is 0. Then, as shown in FIG. 4, the individual output power P _Bk ^out changes linearly. From the above, in setting the weight w _Bk relating to the active power, by using the above equation (6), the ratio to the rated output P _Bk ^lmt of each power conditioner 22 with the change of the control command value pr _B is ^{calculated as follows} . Each storage battery 21 can be charged and discharged. Therefore, a plurality of power conditioners 22, be different their rated output P _Bk ^lmt, when the absolute value of the control command value pr _B is control command value limit pr _B ^lmt, 100 of the rated output P _Bk ^lmt % Of the storage battery 21 can be charged and discharged. Specifically, when the control command value pr _B is a negative value of the control command value limit pr _B ^lmt , the storage battery 21 is discharged at 100% of the rated output P _Bk ^lmt , and the control command value pr _B becomes the control command value pr _B. when the value of the value limit pr _B ^lmt, it is possible to charge the storage battery 21 at 100% of the rated output P _Bk ^lmt. When the same value is used as the weight w _Bk relating to the active power, the individual output power P _Bk ^out is uniformly reduced by the same amount even if the rated output P _Bk ^lmt of each power conditioner 22 is different. it can.

  The output control unit 225 controls the output power of each power conditioner 22. In the present embodiment, the output control unit 225 controls the individual output power to the individual target value calculated by the information processing unit 224. The output control unit 225 is configured similarly to the output control unit 125. As shown in FIG. 2, the output control section 225 includes an inverter circuit 225a, a transformer 225b, a detection circuit 225c, a control circuit 225d, and the like. The inverter circuit 225a, the transformer 225b, the detection circuit 225c, and the control circuit 225d are configured similarly to the inverter circuit 125a, the transformer 125b, the detection circuit 125c, and the control circuit 125d, respectively. The configuration of each output control unit 225 is not limited to the above. In the present embodiment, the detection circuit 225c corresponds to an “output power detection unit” described in the claims.

In each power conditioner 22, when receiving the control command value pr _B from the processing device 42 by the receiving unit 222a, the second communication unit 222 outputs the received control command value pr _B to the information processing unit 224. The information processing unit 224 calculates individual target value by using the input control command value pr _B, and outputs the calculated individual target value to the output control unit 225. The output control unit 225 controls the individual output power based on the input individual target value.

  In each power conditioner 22, the output control unit 225 outputs the value of the individual output power detected by the detection circuit 225c to the first communication unit 221 and the second communication unit 222. The first communication unit 221 transmits the value of the input individual output power to the terminal device 41 by the transmission unit 221b via the network hub H1 and the WAN 81. In addition, the second communication unit 222 transmits the value of the input individual output power to the processing device 42 by the transmission unit 222b via the network hub H2.

  In each power conditioner 22, when the control circuit 225d detects an operation abnormality of the output control unit 225, the output control unit 225 outputs a signal (operation abnormality signal) indicating the operation abnormality to the first communication unit 221. . The first communication unit 221 transmits the input operation abnormality signal to the terminal device 41 via the network hub H1 and the WAN 81 by the transmission unit 221b.

  As illustrated in FIG. 2, the power receiving facility 3 includes a communication unit 31, a detection unit 32, an auxiliary relay 33, and a control unit 34 as a functional configuration of a control system.

  The communication unit 31 is connected to the LAN 82, and is connected to the network hub H2 via the LAN 82. The power receiving facility 3 can communicate with a device connected to the network hub H2 by the communication unit 31. The communication unit 31 includes a reception unit 31a and a transmission unit 31b, as shown in FIG. The receiving unit 31a receives a signal from each device connected to the network hub H2. The transmission unit 31b transmits a signal to each device connected to the network hub H2.

  The detection unit 32 is a sensor that is installed on the power line 90 and detects connection point power (connection point power detection value). The detection unit 32 outputs the detected connection point power detection value to the control unit 34.

  The auxiliary relay 33 is a relay device that operates by detecting a reverse power flow, and is a device different from a reverse power relay. The auxiliary relay 33 has an electric contact (not shown). The electrical contact operates by detecting the occurrence of reverse power flow when the power at the connection point becomes equal to or higher than the threshold. For example, 0 is set as the threshold. The value may be smaller than 0 by a predetermined amount (however, a value larger than the reverse power flow avoidance target value). When the electric contact operates, the auxiliary relay 33 outputs a contact signal indicating that the electric contact has operated to the control unit 34. In the present embodiment, the reverse power relay (not shown) detects that the reverse power flow has occurred when the reverse power flow state continues for about 50 ms, whereas the auxiliary relay 33 (electrical contact) detects the reverse power flow. When the state of the power flow continues for about 10 ms, it is detected that the reverse power flow has occurred. That is, the time for the auxiliary relay 33 to detect the reverse power flow is set shorter than the time for the reverse power relay to detect the reverse power flow. Thereby, the auxiliary relay 33 can detect the reverse power flow earlier than the reverse power relay. In addition, when the power system S1 is a system in which the reverse power flow to the power system K is not prohibited, the auxiliary relay 33 may not be provided.

  The control unit 34 performs various controls of the power receiving facility 3. The control unit 34 controls, for example, distribution of power by a switchboard or a distribution board.

  In the power receiving facility 3, the detection unit 32 outputs the detected connection point power detection value to the control unit 34. The control unit 34 outputs the input connection point power detection value to the communication unit 31. The communication unit 31 transmits the input connection point power detection value to the processing device 42 by the transmission unit 31b via the LAN 82 and the network hub H2.

  In the power receiving facility 3, when detecting the reverse power flow, the auxiliary relay 33 outputs a contact signal to the control unit 34. The control unit 34 outputs the input contact signal to the communication unit 31. The communication unit 31 transmits the input contact signal to the processing device 42 by the transmission unit 31b via the LAN 82 and the network hub H2.

  As illustrated in FIG. 2, the terminal device 41 includes a communication unit 411, an operation unit 412, a notification unit 413, and a control unit 414 as a functional configuration of a control system.

  The communication unit 411 is connected to the WAN 81, and is connected to the network hub H1 via the WAN 81. The terminal device 41 can communicate with a device connected to the network hub H1 by the communication unit 411. The communication unit 411 includes a reception unit 411a and a transmission unit 411b, as shown in FIG. The receiving unit 411a receives a signal from each device connected to the network hub H1. The transmission unit 411b transmits a signal to each device connected to the network hub H1. In the present embodiment, the transmission unit 411b of the communication unit 411 corresponds to a “terminal device transmission unit” described in the claims.

  The operation unit 412 is an interface for performing various operations on the terminal device 41. The operation unit 412 receives various setting operations in the power system S1. In the present embodiment, various setting operations include, for example, a control mode setting operation and an adjustment target value setting operation. Note that the operation unit 412 can also accept an operation on an object whose setting can be changed by the user in the power system S1.

  The notification unit 413 is an interface for performing various types of notification in the terminal device 41. The notification unit 413 includes a display, for example, and notifies the user of the information by displaying the information on the display. The notification unit 413 includes, for example, a speaker, and the information is output to the speaker to notify the user of the information.

  The control unit 414 performs various controls in the terminal device 41. The control unit 414 causes the notification unit 413 to notify the input signal. The control unit 414 operates according to the operation received by the operation unit 412. For example, the control unit 414 outputs a setting command to the communication unit 411 according to the setting operation received by the operation unit 412, and the communication unit 411 transmits the command to the processing device 42 or the like.

  In the terminal device 41, when the operation unit 412 receives a control mode setting operation, the control unit 414 generates a control mode setting command according to the operation. In the present embodiment, a normal mode, a schedule mode, an output suppression mode, a peak cut mode, and a reverse power flow avoidance mode can be set by the user. When the operation unit 412 receives a setting operation of the normal mode, the control unit Reference numeral 414 generates a control mode setting command for instructing setting of the normal mode. Similarly, in the schedule mode, the output suppression mode, the peak cut mode, and the reverse power flow avoidance mode, when the operation unit 412 accepts the setting operation of these control modes, the control unit 414 sets the control mode of the set operation mode. A control mode setting command for setting is generated. Then, control unit 414 outputs the generated control mode setting command to communication unit 411. When the control mode setting command is input to the communication unit 411, the transmitting unit 411b transmits the control mode setting command to the processing device 42 via the WAN 81 and the network hub H1.

  In the terminal device 41, when the operation unit 412 receives an operation of setting an adjustment target value for each control mode, the control unit 414 generates an adjustment target value setting command corresponding to the operation. The adjustment target value is an overall target value in each control mode, for example, a suppression target value in the output suppression mode, a peak cut target value in the peak cut mode, and a reverse power flow in the reverse power flow avoidance mode. This is the avoidance target value, and is the schedule target value in the schedule mode. The control unit 414 outputs the generated adjustment target value setting command to the communication unit 411. When the adjustment target value setting command is input to the communication unit 411, the transmission unit 411b transmits the adjustment target value setting command to the processing device 42 via the WAN 81 and the network hub H1. In the present embodiment, when the operation unit 412 receives an operation for setting the suppression target value, the peak cut target value, or the reverse power flow avoidance target value, the communication unit 411 issues an adjustment target value setting command for these adjustment target values. It is configured to be sent. In addition, when the operation unit 412 receives a setting operation of a schedule target value, an adjustment target value setting command for a schedule target value for a predetermined period is periodically transmitted from the communication unit 411 sequentially. I have. It should be noted that an adjustment target value setting command for all adjustment target values may be transmitted periodically. In the present embodiment, a combination of the operation unit 412 and the control unit 414 corresponds to an “instruction unit” described in the claims.

  In the terminal device 41, when the receiving unit 411a receives the value of the individual output power from each of the power conditioners 12, 22, the communication unit 411 outputs the value of the individual output power to the control unit 414. The control unit 414 causes the notification unit 413 to notify the value of each input individual output power. Further, when the receiving unit 411a receives an abnormal operation signal from each of the power conditioners 12, 22, the communication unit 411 outputs the abnormal operation signal to the control unit 414. The control unit 414 causes the notifying unit 413 to notify the input operation abnormality signal. Thereby, the user can confirm the output status (the value of the individual output power) of each of the power conditioners 12 and 22 and the occurrence of an abnormal operation.

  As illustrated in FIG. 2, the processing device 42 includes a first communication unit 421, a second communication unit 422, a storage unit 423, a setting unit 424, a calculation unit 425, and a derivation unit 426 as a functional configuration of a control system. . In the present embodiment, the first communication unit 421, the second communication unit 422, the storage unit 423, the setting unit 424, the calculation unit 425, and the derivation unit 426 are connected to the communication bus 429, and are connected via the communication bus 429. Thus, communication within the processing device 42 is performed. The communication network in the processing device 42 is not limited to the bus type connection. Further, the first communication unit 421 and the second communication unit 422 may be configured by one module or may be configured by different modules.

  The first communication unit 421 is connected to the network hub H1, and performs communication via the network hub H1. As shown in FIG. 2, the first communication unit 421 includes a reception unit 421a and a transmission unit 421b. The receiving unit 421a receives a signal from each device connected to the network hub H1. The transmission unit 421b transmits a signal to each device connected to the network hub H1.

  In the first communication unit 421, the receiving unit 421 a receives a control mode setting command from the terminal device 41 and outputs this to the setting unit 424. Further, the receiving unit 421 a receives the adjustment target value setting command from the terminal device 41 and outputs this to the storage unit 423.

  The second communication unit 422 is connected to the network hub H2 and performs communication via the network hub H2. As shown in FIG. 2, the second communication unit 422 includes a reception unit 422a and a transmission unit 422b. The receiving unit 422a receives a signal from each device connected to the network hub H2. The transmission unit 422b transmits a signal to each device connected to the network hub H2.

  In the second communication unit 422, the receiving unit 422 a receives the connection point power detection value from the power receiving facility 3 and outputs this to the derivation unit 426. The receiving unit 422 a receives the value of the individual output power from each of the power conditioners 12 and 22 and outputs the value to the calculating unit 425.

In the second communication unit 422, the transmission unit 422b transmits the derived control command value pr _PV to each power conditioner 12, and transmits the derived control command value pr _B to each power conditioner 22.

When communicating with each of the power conditioners 12 and 22 in the second communication unit 422, there are cases in which communication is performed by one-way communication and cases in which communication is performed by two-way communication. The one-way communication protocol is not particularly limited, but is, for example, UDP (User Datagram Protocol). The protocol of the two-way communication is not particularly limited, but is, for example, the Modbus protocol. Communication using UDP is called UDP communication, and communication using Modbus protocol is called Modbus communication. In the present embodiment, when transmitting the control command values pr _PV and pr _B to the power conditioners 12 and 22, respectively, the transmitting unit 422b performs simultaneous transmission by UDP communication. Further, in the present embodiment, when receiving the individual output power from each of the power conditioners 12 and 22, the receiving unit 422a receives the individual output power through Modbus communication. Modbus communication between each of the power conditioners 12, 22 and the second communication unit 422 is one-to-one communication. Note that, when the receiving unit 422a receives the individual output power from each of the power conditioners 12, 22 by the receiving unit 422a, the second communication unit 422 indicates to the power conditioners 12, 22 by the transmitting unit 422b that the reception is normal. Transmit a signal (reception confirmation signal).

  In the present embodiment, a combination of the receiving unit 421a of the first communication unit 421 and the receiving unit 422a of the second communication unit 422 corresponds to a “processing device receiving unit” described in the claims. A combination of the transmission unit 421b of the first communication unit 421 and the transmission unit 422b of the second communication unit 422 corresponds to a “processing device transmission unit” described in the claims.

  The storage unit 423 stores various types of information in the processing device 42. In the present embodiment, the storage unit 423 stores an adjustment target value for each control mode and a set value of a control command value when communication is abnormal (hereinafter, referred to as “set value at abnormal time”). The details of the abnormal time setting value will be described later. Upon receiving the adjustment target value setting command from the first communication unit 421 (receiving unit 421a), the storage unit 423 updates the stored adjustment target value based on the adjustment target value setting command.

  The setting unit 424 performs various settings in the processing device 42. In the present embodiment, when a control mode setting command is input from the first communication unit 421 (the receiving unit 421a), the setting unit 424 controls the power control mode of the power system S1 based on the control mode setting command. Make the settings for In the present embodiment, when a control mode setting command instructing the setting of the normal mode is input, the setting unit 424 sets the normal mode. Further, when a control mode setting command instructing the setting of the schedule mode is input, the schedule mode is set. Similarly, when a control mode setting command instructing the setting of the output suppression mode is input, the output suppression mode is set, and when a control mode setting command instructing the setting of the peak cut mode is input, the peak cut mode is set. Is set, and when a control mode setting command instructing the setting of the reverse power flow avoiding mode is input, the reverse power flow avoiding mode is set. In this embodiment, when an alarm signal is input from a demand monitoring device (not shown), the setting unit 424 sets the peak cut assist mode. Therefore, the power system S1 automatically sets the peak cut assist mode based on the alarm signal from the demand monitoring device. Further, upon receiving a contact signal from power receiving facility 3 (auxiliary relay 33), setting section 424 sets a reverse power flow avoidance mode. Therefore, the power system S1 automatically sets the reverse power flow avoidance mode based on the contact signal from the auxiliary relay 33. Further, the setting unit 424 sets the emergency mode if the adjustment target value for the set control mode is not stored in the storage unit 423. For example, when the schedule target value is not stored in the storage unit 423 despite the schedule mode being set, the emergency mode is set.

  The calculating unit 425 calculates the connection point estimated value, the total output value of the solar cell PCS group, and the total output value of the storage battery PCS group using the value of the individual output power input from the second communication unit 422. Specifically, the calculation unit 425 calculates the connection point estimated value by summing all the values of the individual output powers of the power conditioners 12 and 22. The calculation unit 425 calculates the total output value of the solar cell PCS by summing the values of the individual output powers of the power conditioners 12. The calculating unit 425 calculates the total output value of the storage battery PCS by summing the values of the individual output powers of the power conditioners 22. Calculating section 425 outputs the calculated connection point power estimated value, total output value of solar cell PCS group and total output value of storage battery PCS group to deriving section 426.

The deriving unit 426 derives a control command value for each of the power conditioners 12, 22 to calculate an individual target value. The deriving unit 426 sets whether to derive a calculation result based on the arithmetic expressions shown in the following equations (7) and (8) as a control command value and to derive a predetermined value for the control mode as a control command value. It is appropriately divided according to the control mode being set. In the following equations (7) and (8), λ represents a Lagrange multiplier, ε represents a gradient coefficient, Pc (t) represents power to be adjusted, and Pt (t) represents an adjustment target value. In the following description, the calculation shown in the following equations (7) and (8) may be referred to as “control command value calculation”. When performing the control command value calculation, the derivation unit 426 sets the connection point power detection value, the connection point power estimation value, and the total output of the solar cell PCS group as the adjustment target power Pc (t) according to the set control mode. Value or the total output value of the storage battery PCS group.

When the normal mode is set, the deriving unit 426 causes each power conditioner 12 to output the maximum amount of power generated by the solar cell 11 and does not cause each power conditioner 22 to charge or discharge the storage battery 21. Then, a fixed value “0” is derived as the control command values pr _PV and pr _B. When the normal mode is set, the control command value may not be derived.

When the schedule mode is set, the deriving unit 426 calculates the above equations (7) and (8), and derives the calculation results as control command values pr _PV and pr _B. In the control command value calculation in the schedule mode, the deriving unit 426 uses the connection point estimated value as the power to be adjusted, and uses the schedule target value as the adjustment target value.

When the output suppression mode is set, the derivation unit 426 derives the calculation results of the above equations (7) and (8) as control command values pr _PV and pr _B. In the control command value calculation in the output suppression mode, the derivation unit 426 uses the connection point power detection value as the adjustment target power and uses the suppression target value as the adjustment target value.

When the peak cut mode is set, the deriving unit 426 derives a fixed value “0” as the control command value pr _{PV in} order to cause each power conditioner 12 to output the power generated by the solar cell 11 to the maximum. , The calculation results of the above equations (7) and (8) are derived as a control command value pr _B. In the control command value calculation in the peak cut mode, the derivation unit 426 uses the connection point power detection value as the power to be adjusted, and uses the peak cut target value as the adjustment target value.

When the peak cut assist mode is set, the deriving unit 426 derives a fixed value “0” as the control command value pr _{PV in} order to cause each power conditioner 12 to output the power generated by the solar cell 11 to the maximum. and, a calculation result of equation (7) and (8) below, derived as the control command value pr _B. The deriving unit 426 uses the storage battery PCS group total output value as the power to be adjusted and the discharge amount target value as the adjustment target value in the control command value calculation in the peak cut assist mode. The discharge amount target value is set for each alarm level of the alarm signal, and can be appropriately changed by the user.

When the reverse power flow avoidance mode is set, the deriving unit 426 derives the calculation results of the above equations (7) and (8) as control command values pr _PV and pr _B. In the control command value calculation in the reverse power flow avoidance mode, the derivation unit 426 uses the connection point power detection value as the power to be adjusted, and uses the reverse power flow avoidance target value as the adjustment target value.

When the reverse power flow emergency avoidance mode is set, the deriving unit 426 derives the control command value limit pr _PV ^lmt as the control command value pr _{PV in} order to cause each power conditioner 12 to suppress the output power. to charge the battery 21 not be discharged to the power conditioner 22, to derive the fixed value "0" as the control command value pr _B.

When the emergency mode is set, the deriving unit 426 causes each power conditioner 12 to output the maximum amount of power generated by the solar cell 11 and does not cause each power conditioner 22 to charge or discharge the storage battery 21. Then, a fixed value “0” is derived as the control command values pr _PV and pr _B.

  The deriving unit 426 derives a control command value according to the set control mode as described above. Then, the derived control command value is output to the second communication unit 422.

  In the processing device 42, when the receiving unit 422 a receives the connection point power detection value from the power receiving facility 3, the second communication unit 422 outputs the received connection point power detection value to the derivation unit 426. When the output suppression mode, the peak cut mode, and the reverse power flow avoidance mode are set as the control modes, the derivation unit 426 uses the input connection point power detection value and the adjustment target value for the set control mode. And control command value calculation.

In the processing device 42, when the receiving unit 422a receives the value of the individual output power from each of the power conditioners 12, 22, the second communication unit 422 outputs the received individual output power to the calculating unit 425. The calculation unit 425 calculates the connection point estimated value, the total output value of the solar cell PCS group and the total output value of the storage battery PCS group using the input individual output power, and outputs the calculated values to the derivation unit 426. I do. When the schedule mode is set as the control mode, the derivation unit 426 performs a control command value calculation using the input connection point power estimated value, and calculates a control command value (control command values pr _PV , pr _B ). Derive. When the peak cut assist mode is set, the deriving unit 426 calculates a control command value using the input total output value of the storage battery PCS group, and derives a control command value (control command value pr _B ). I do.

In the processing device 42, when deriving the control command value, the deriving unit 426 outputs the derived control command value to the second communication unit 422. The second communication unit 422 transmits the input control command value to each of the power conditioners 12 and 22 by the transmission unit 422b. At this time, the transmission unit 422b transmits the input control command value pr _PV to each power conditioner 12, and transmits the input control command value pr _B to each power conditioner 12. When transmitting the control command value, the transmission unit 422b performs one-way simultaneous communication (for example, UDP communication).

  In the processing device 42, when the receiving unit 421a receives the adjustment target value setting command from the terminal device 41, the first communication unit 421 outputs the received adjustment target value setting command to the storage unit 423. The storage unit 423 stores the adjustment target value based on the input adjustment target value setting command. If the adjustment target value has already been stored, the storage unit 423 updates (overwrites) the newly input adjustment target value.

  In the processing device 42, when the receiving unit 421a receives the control mode setting command from the terminal device 41, the first communication unit 421 outputs the received control mode setting command to the setting unit 424. The setting unit 424 sets the control mode based on the input control mode setting command.

  As described above, the power system S1 performs power control using the control command value according to the set control mode.

  Next, a case will be described in which, in the power system S1, communication is not normally performed between devices or between elements inside each device. In the present embodiment, as a situation in which communication is not performed normally, for example, when communication is interrupted between devices or between elements in each device, or between devices or inside each device. The description will be made assuming a case where a signal abnormality occurs between the elements in the above.

<Case 1: Communication interruption between terminal device 41 and processing device 42>
First, a case where a communication disconnection occurs between the terminal device 41 and the processing device 42 will be described. In the present embodiment, when the user operates the operation unit 412 to perform the setting operation of the suppression target value, the peak cut target value, or the reverse power flow avoidance target value, the terminal device 41 receives the setting operation. Then, an adjustment target value setting command for these adjustment target values is transmitted to the processing device 42. When the user operates the operation unit 412 to perform a setting operation of the schedule target value, the terminal device 41 periodically sends an adjustment target value setting command to the processing device 42 for the schedule target value for a certain period. Sending. However, when a communication disconnection occurs between the terminal device 41 and the processing device 42, the processing device 42 cannot receive the adjustment target value setting command from the terminal device 41. As a result, since the processing device 42 cannot correctly recognize the adjustment target value set by the user, it cannot derive an appropriate control command value. Therefore, the power system S1 cannot perform power control using the control command value.

  Therefore, when the terminal device 41 cannot transmit the adjustment target value setting command to the processing device 42, the terminal device 41 notifies that a communication disconnection has occurred between the terminal device 41 and the processing device 42. Specifically, in the terminal device 41, when the adjustment target value setting command is input from the control unit 414, the communication unit 411 transmits the command to the processing device 42 via the WAN 81 and the network hub H1. At this time, when the processing device 42 has successfully received the adjustment target value setting command, the processing device 42 transmits a response signal indicating that the command has been normally received to the terminal device 41. Therefore, when the terminal device 41 (communication unit 411) successfully transmits the adjustment target value setting command to the processing device 42, the terminal device 41 (the communication unit 411) receives the response signal. If not, the response signal is not received. Therefore, when the communication unit 411 does not receive the response signal, the communication unit 411 determines that the adjustment target value setting command has not been normally transmitted to the processing device 42, and notifies the control unit 414 of that. In response to this notification, the control unit 414 notifies the communication unit 413 of the fact that the communication disconnection has occurred between the terminal device 41 and the processing device 42. Thereby, the user can recognize that the communication disconnection has occurred between the terminal device 41 and the processing device 42, so that the user can stop the power control of the power system S1 or can perform the communication between the terminal device 41 and the processing device 42. Can be repaired.

  Further, since the adjustment target value setting command for the schedule target value is periodically transmitted from the terminal device 41 to the processing device 42 as described above, the processing device 42 issues the adjustment target value setting command for the previous schedule target value. Even if a predetermined time elapses from the reception, if the adjustment target value setting command for the next schedule target value is not received, it can be determined that the communication with the terminal device 41 has been disconnected.

  Therefore, when the processing device 42 cannot receive the adjustment target value setting command for the schedule target value from the terminal device 41, the processing device 42 sets the emergency mode as the control mode. Specifically, when the schedule mode is set, if the first communication unit 421 does not receive the adjustment target value setting command for the schedule target value from the terminal device 41, the first communication unit 421 communicates between the terminal device 41 and the processing device 42. It is determined that a communication break has occurred between them. Then, the first communication unit 421 notifies the setting unit 424 that the communication disconnection has occurred. The setting unit 424 sets the emergency mode as the control mode in response to the notification from the first communication unit 421. That is, the setting unit 424 switches from the schedule mode to the emergency mode. The processing unit 42 stores the schedule target value for a certain period in the storage unit 423 according to the adjustment target value setting command for the schedule target value already received. Therefore, even if the adjustment target value setting command for the schedule target value cannot be received from the terminal device 41, while the schedule target value in the current time zone is stored in the storage unit 423, the schedule target value is used. Performs control command value calculation. After that, when the schedule target value in the time zone at that time is not stored in the storage unit 423, the setting unit 424 may switch to the emergency mode.

  Accordingly, even if the processing device 42 cannot normally receive the schedule target value adjustment target value setting command from the terminal device 41, the power system S1 performs power control in the emergency mode. Control can be continuously performed without stopping.

  Further, when a communication disconnection occurs between the terminal device 41 and the processing device 42, the terminal device 41 cannot transmit a control mode setting command to the processing device 42. Therefore, when the terminal device 41 cannot transmit the control mode setting command to the processing device 42, the notification unit 413 notifies that the communication has been disconnected between the terminal device 41 and the processing device 42.

<Case 2: Communication interruption between terminal device 41 and power conditioners 12, 22>
Next, a case where a communication break occurs between the terminal device 41 and each of the power conditioners 12 and 22 will be described. When a communication break occurs between the terminal device 41 and each of the power conditioners 12 and 22, transmission and reception of signals between the terminal device 41 and the power conditioners 12 and 22 become impossible. However, information related to power control using the control command value is not transmitted or received by communication between them. For example, the individual output power is transmitted from each of the power conditioners 12 and 22 to the terminal device 41, but the terminal device 41 only reports the received individual output power, and performs power control using the control command value. Not used for Therefore, the power system S <b> 1 continues to perform power control using the control command value even if a communication break occurs between the terminal device 41 and each of the power conditioners 12 and 22. Note that, when detecting that the communication disconnection has occurred between the power conditioners 12 and 22, the terminal device 41 notifies the notification unit 413 of the communication disconnection.

  Thus, even if a communication break occurs between the terminal device 41 and each of the power conditioners 12 and 22, power control using the control command value can be continuously performed. Further, since the terminal device 41 notifies that the communication interruption has occurred, the user can recognize that the communication interruption has occurred.

<Case 3: Communication interruption between power receiving facility 3 and processing device 42>
Next, a case where a communication disconnection occurs between the power receiving facility 3 and the processing device 42 will be described. If a communication break occurs between the power receiving facility 3 and the processing device 42, the processing device 42 cannot receive the connection point power detection value from the power receiving facility 3. Therefore, the processing device 42 cannot perform the control command value calculation (the calculation of the above formulas (7) and (8)) using the connection point power detection value. Therefore, when the control mode in which the control command value is derived by the control command value calculation using the connection point power detection value is set, that is, the output control mode, the peak cut mode, and the reverse power flow avoidance mode are set. If set, the control command value cannot be derived due to the communication interruption. Therefore, the power system S1 cannot perform power control using the control command value.

  Therefore, when the connection point power detection value cannot be normally received, the processing device 42 transmits a set value (set value at the time of abnormality) according to the set control mode as a control command value. In addition, since the power receiving facility 3 periodically transmits the connection point power detection value to the processing device 42, the processing device 42 receives If a new connection point power detection value has not been received, it is determined that normal reception was not possible (communication disconnected). The abnormal time set value is stored in the storage unit 423 as described above. In the present embodiment, since the control command value cannot be derived when the output suppression mode, the peak cut mode, and the reverse power flow avoidance mode are set, at least the abnormal time set value corresponding to these control modes is stored in the storage unit. 423. The details of the abnormal time set value according to each control mode will be described later. Then, each of the power conditioners 12 and 22 receives the control command value (set value at the time of abnormality) and performs power control as usual. When a control mode other than the above-described control mode (for example, a schedule mode) is set, a control command value can be derived in the same manner as in a normal mode, so that power control according to the set control mode is performed. Continue to do so.

The abnormal setting value for the output suppression mode is a value for suppressing the output power of each power conditioner 12 as a control command value pr _PV to be transmitted to each power conditioner 12, and is transmitted to each power conditioner 22. The control command value pr _B is a value for preventing each power conditioner 22 from charging or discharging the storage battery 21. Therefore, in the present embodiment, when the second communication unit 422 cannot normally receive the connection point power detection value while the output suppression mode is set, the derivation unit 426 sets the control command value pr _PV as the control command value pr _PV. The control command value limit pr _PV ^lmt is derived, and “0” is derived as the control command value pr _B. Incidentally, abnormal set value for the output suppression mode for the control command value pr _B to be transmitted to the power conditioner 22, may be a value for charging the storage battery 21 to the power conditioner 22. Therefore, an abnormal setting value for the output suppression mode for the control command value pr _PV, the value for suppressing the output power of each power conditioner 12, for the control command value pr _B, each power A value that does not cause the conditioner 22 to discharge the storage battery 21 may be used.

The abnormal time set value for the peak cut mode is used as a control command value pr _PV to be transmitted to each power conditioner 12 so that each power conditioner 12 outputs the power generated by the solar cell 11 to the maximum (the output power is not suppressed). The control command value pr _B transmitted to each power conditioner 22 is a value for preventing each power conditioner 22 from charging or discharging the storage battery 21. Therefore, in the present embodiment, when the second communication unit 422 cannot normally receive the connection point power detection value while the peak cut mode is set, the derivation unit 426 sets the control command values pr _PV , pr “0” is derived as _B. Incidentally, abnormal setting for peak shaving mode, for control command value pr _B to be transmitted to the power conditioner 22, it may be a value for discharging the storage battery 21 to the power conditioner 22. Therefore, as an abnormal time setting value for the peak cut mode, a value for preventing the output power of each power conditioner 12 from being suppressed is set for the control command value pr _PV , and a value for each control command value pr _B is set for the control command value pr _B. A value for preventing the conditioner 22 from charging the storage battery 21 may be used.

The abnormal-time set value for the reverse power flow avoiding mode is a value for suppressing the output power of each power conditioner 12 as a control command value pr _PV to be transmitted to each power conditioner 12, and transmitted to each power conditioner 22. The control command value pr _B is a value that causes each power conditioner 22 to charge the storage battery 21. Therefore, in the present embodiment, when the reverse power flow avoidance mode is set and the second communication unit 422 cannot normally receive the connection point power detection value, the derivation unit 426 sets the control command value pr _PV as the control command value pr _PV. The control command value limit pr _PV ^lmt is derived, and a value (−pr _B ^lmt ) in which the control command value limit pr _B ^lmt is ^set to a negative value is derived as the control command value pr _B. Note that the abnormal time set value for the reverse power flow avoidance mode is a value for preventing each power conditioner 22 from charging / discharging the storage battery 21 with respect to the control command value pr _B transmitted to each power conditioner 22. Is also good. Therefore, the abnormality setting for reverse flow avoidance mode for the control command value pr _PV, the value for suppressing the output power to the power conditioner 12, for the control command value pr _B, each A value for preventing the power conditioner 22 from discharging the storage battery 21 may be used.

  Further, when the processing unit 42 cannot receive the connection point power detection value, the processing unit 42 notifies the terminal device 41 that the connection point power value has not been received by the first communication unit 421 (the transmission unit 421b). . Then, based on the notification, the terminal device 41 notifies a warning that a communication disconnection has occurred between the power receiving facility 3 and the processing device 42. The warning is given when the control mode for deriving the control command value by the control command value calculation using the connection point power detection value is set, that is, the output suppression mode, the peak cut mode, and the reverse power flow avoidance mode. May be performed only when any one of the control modes is set, or may be performed when any other control mode is set.

  As a result, the power system S1 is in a state where the processing device 42 cannot receive the connection point power detection value from the power receiving device 3 due to the communication interruption between the power receiving device 3 and the processing device 42, and cannot perform the control command value calculation. Even if there is, the power control using the control command value can be continuously performed by using the abnormal time set value according to the set control mode as the control command value.

Further, as described above, the abnormal time set value for the output suppression mode, the value for suppressing the output power of each power conditioner 12 as a control command value pr _PV is, the power conditioner as a control command value pr _B 22 The values for preventing the storage battery 21 from being charged or discharged are stored in the storage unit 423. Therefore, when the power receiving facility 3 and the processing device 42 lose communication when the output suppression mode is set, the power system S1 uses the abnormal time set value for the output suppression mode as a control command value. The power output to the power system K can be reduced. Thereby, in the power system S1, the possibility that the detected value of the connection point power exceeds the suppression target value can be reduced.

Further, as described above, the abnormal-time set value for the peak cut mode is used as a control command value pr _PV to cause each power conditioner 12 to output the power generated by the solar cell 11 to the maximum (not to suppress the output power). A value for preventing the power conditioner 22 from charging or discharging the storage battery 21 is stored in the storage unit 423 as a control command value pr _B. Therefore, when communication between the power receiving facility 3 and the processing device 42 is interrupted while the peak cut mode is set, the power system K uses the abnormal time set value for the peak cut mode as a control command value. The power input to the power system S1 can be reduced (the purchased power can be reduced). Thereby, in power system S1, the possibility that a power peak rises can be reduced.

Further, as described above, the abnormal time setting for the reverse flow avoidance mode, the value for suppressing the output power to the power conditioner 12 as a control command value pr _PV is, the power conditioner as a control command value pr _B The value for causing the storage battery 21 to charge the storage battery 21 is stored in the storage unit 423. Therefore, if communication between the power receiving facility 3 and the processing device 42 is interrupted while the reverse power flow avoidance mode is set, the abnormal system set value for the reverse power flow avoidance mode is used as a control command value, and the power system The power input from K to the power system S1 can be increased (the purchased power can be increased). As a result, in the power system S1, the possibility of the occurrence of reverse power flow can be reduced. Further, when communication is interrupted between the power receiving facility 3 and the processing device 42, the processing device 42 cannot receive the contact signal from the auxiliary relay 33. However, by using the abnormal-time setting value for the reverse power flow avoiding mode, the possibility of the occurrence of reverse power flow can be reduced, so that the occurrence of reverse power flow due to the inability to receive the contact signal from the auxiliary relay 33 is suppressed. it can.

<Case 4: Communication interruption between the processing device 42 and each of the power conditioners 12, 22>
Next, a case where a communication break occurs between the processing device 42 and each of the power conditioners 12 and 22 will be described. In the present embodiment, a communication disconnection occurs between the processing device 42 and each of the power conditioners 12 and 22 in one-way communication (UDP communication), and a communication disconnection occurs in two-way communication (Modbus communication). There are times when you do. Hereinafter, each case will be described.

<Case 4-1: When communication disconnection occurs in one-way communication>
In the present embodiment, when transmitting the control command value to each of the power conditioners 12 and 22, the processing device 42 transmits the control command value by one-way communication (UDP communication). Therefore, when communication disconnection occurs in one-way communication from the processing device 42 to each of the power conditioners 12 and 22, the second communication units 122 and 222 of each of the power conditioners 12 and 22 cannot receive the control command value. As a result, the power conditioners 12 and 22 cannot calculate the individual target values by the information processing units 124 and 224, so that the power system S1 cannot perform power control appropriately.

Therefore, when the power conditioners 12 and 22 cannot receive the control command value from the processing device 42, the power conditioners 12 and 22 put the output of power from their own devices in a standby state. Specifically, in each of the power conditioners 12 and 22, when the receiving units 122a and 222a cannot receive the control command values pr _PV and pr _B from the processing device 42, the receiving units 122a and 222a notify the information processing units 124 and 224 of the fact. . Then, in response to the notification, the information processing units 124 and 224 instruct the output control units 125 and 225 to stop outputting power. The output control units 125 and 225 stop the inverter circuits 125a and 225a according to the instruction and stop outputting power. The power conditioners 12 and 22 that have received the control command value from the processing device 42 control the individual output power based on the received control command value as usual.

  When the power conditioners 12 and 22 cannot receive the control command value from the processing device 42, the first communication units 121 and 221 (the transmission units 121b and 221b) notify the terminal that the control command value could not be received. Notify the device 41. Then, based on the notification, the terminal device 41 notifies a warning that a communication disconnection has occurred in the one-way communication between the processing device 42 and each of the power conditioners 12 and 22.

  As a result, the power system S1 is unable to calculate the individual target value because the power conditioners 12, 22 cannot receive the control command value due to the communication disconnection between the power conditioners 12, 22 and the processing device 42. However, inappropriate power control can be suppressed. For example, during operation in the reverse power flow avoidance mode, it is possible to suppress the possibility that a reverse power flow will occur. Note that the processing device 42 does not change the method of deriving the control command value depending on whether the control command value has been normally transmitted to each of the power conditioners 12 and 22. Even if the value cannot be transmitted, the normal processing is performed.

<Case 4-2: When communication disconnection occurs in bidirectional communication>
In the present embodiment, each of the power conditioners 12 and 22 transmits the value of the individual output power to the processing device 42 by bidirectional communication (Modbus communication). Therefore, when a communication disconnection occurs in both communication between the power conditioners 12 and 22 and the processing device 42, the second communication units 122 and 222 (the transmission units 122b and 222b) of the power conditioners 12 and 22 respectively Unable to send individual output power value. Therefore, the processing device 42 can use only the value of the received individual output power, excluding the value of the individual output power that could not be received.

  In such a situation, when the schedule mode or the peak cut assist mode is set as the control mode, the processing device 42 can receive the individual output power from each of the power conditioners 12 and 22 even if it cannot receive the individual output power. The derivation of the control command value is continued using the value of each individual output power thus obtained. Therefore, since the processing device 42 does not perform any special operation in response to the communication interruption, an inappropriate control command value that does not conform to the power output state of each of the power conditioners 12 and 22 is calculated. In addition, since each of the power conditioners 12 and 22 controls the individual output power based on such an inappropriate control command value, there is a possibility that the power system S1 may perform inappropriate power control. is there.

  Therefore, when the respective power conditioners 12 and 22 cannot transmit the value of the individual output power to the processing device 42, the respective power conditioners 12 and 22 put their own devices (the power conditioners 12 and 22) in a standby state. Since each of the power conditioners 12 and 22 does not confirm which control mode is set, no matter which control mode is set in the processing device 42, if the value of the individual output power cannot be transmitted, Then, the apparatus (the power conditioners 12, 22) is set to the standby state. Specifically, in each of the power conditioners 12 and 22, the second communication unit 122 or 222 notifies the information processing unit 124 when the transmission unit 122b or 222b cannot transmit the value of the individual output power to the processing device 42. , 224. Then, in response to the notification, the information processing units 124 and 224 instruct the output control units 125 and 225 to stop outputting power. The output control units 125 and 225 stop the inverter circuits 125a and 225a according to the instruction and stop outputting power. In the present embodiment, when the second communication units 122 and 222 can transmit the value of the individual output power to the processing device 42, the second communication units 122 and 222 receive the reception confirmation signal from the processing device 42. If the transmission is not successful, the reception confirmation signal is not received. Therefore, when the second communication units 122 and 222 cannot receive the reception confirmation signal, they can determine that the value of the individual output power has not been transmitted.

  In addition, when the power conditioners 12 and 22 cannot transmit the value of the individual output power to the processing device 42, the first communication unit 421 (the transmission unit 421b) cannot transmit the value of the individual output power. This is notified to the terminal device 41. Then, based on the notification, the terminal device 41 notifies a warning that a communication disconnection has occurred in the bidirectional communication between the processing device 42 and each of the power conditioners 12 and 22.

  Thereby, the power system S1 can suppress improper power control from being performed even in a situation where the value of the individual output power cannot be normally transmitted from each of the power conditioners 12 and 22. For example, FIGS. 5 to 8 are diagrams for explaining an example of power control in case 4-2. 5 to 8 show a case where the power system S1 includes three power conditioners 22A, 22B, and 22C, and the output power from the power system S1 to the power system K depends on the schedule mode. It is assumed that the power is controlled to be 300 kW. Therefore, the schedule target value is set to 300 kW. 5 to 8, the power system S1 is simplified.

FIG. 5 shows a case where the processing device 42 and each of the power conditioners 22A, 22B, and 22C can communicate normally. It is assumed that the power conditioners 22A, 22B, and 22C output power of 100 kW each. At this time, each of the power conditioners 22A, 22B, and 22C transmits the value of the individual output power to the processing device 42, and the processing device 42 receives the value of each individual output power from each of the power conditioners 22A, 22B, and 22C. I do. The processing device 42 calculates the estimated value of the connection point power as 300 kW based on the values of the individual output powers. Then, a control command value is derived by a control command value calculation using the estimated connection point power value and the schedule target value (300 kW). Derived control command value, as shown in FIG. 5, the power conditioner 22A, 22B, a value for the 100kW individual output power 22C, referred to as the control command value pr _B ^100. Then, the processing unit 42 transmits a control command value pr _B ¹⁰⁰ derived the power conditioner 22A, 22B, to 22C, the power conditioner 22A, 22B, 22C receives the control command value pr _B ^100. Each power conditioner 22A, 22B, 22C, on the basis of the control command value pr _B ¹⁰⁰ received, to calculate an individual target value, as the individual output power is individually a target value, controlling the output. As a result, power is output from each of the power conditioners 22A, 22B, and 22C by 100 kW. Therefore, in the situation shown in FIG. 5, power control using the control command value is appropriately performed.

FIG. 6 shows a case where a communication disconnection has occurred in bidirectional communication (Modbus communication) between the power conditioner 22C and the processing device 42 in the situation shown in FIG. In the situation illustrated in FIG. 6, the value of the individual output power cannot be transmitted from the power conditioner 22C to the processing device 42 due to the communication interruption. Therefore, the processing device 42 cannot receive the value of the individual output power of the power conditioner 22C, and calculates the connection point estimated value using the value of the individual output power received from the power conditioners 22A and 22B. The estimated connection point power value calculated at this time is 200 kW. At this time, since the estimated power of the connection point is 200 kW with respect to the schedule target value of 300 kW, the processing device 42 increases the estimated power of the connection point to 300 kW by using the power conditioners 22A and 22B. A control command value for changing the individual output power from 100 kW to 150 kW is derived. The derived control command value, each power conditioner 22A, the individual output power 22B is a value for the 150 kW, it referred to as the control command value pr _B ^0.99.

FIG. 7 shows power control in the situation where the communication interruption shown in FIG. 6 has occurred, without taking into account the response when the communication interruption occurs. That is, the case where the power control of the conventional power system is performed is shown. The processing device 42 transmits the derived control command value pr _B ¹⁵⁰ by one-way communication (UDP communication), and the one-way communication between the power conditioner 22C and the processing device 42 can be normally communicated. each power conditioner 22A, 22B, 22C are all receives the control command value pr _B ^0.99. Therefore, the power conditioner 22A, 22B, 22C calculates individual target value based on a control command value pr _B ^0.99 received, thereby performing output control such individual output power is individual target value. As a result, each of the power conditioners 22A, 22B, and 22C outputs 150 kW, and 450 kW of power is output from the power system S1 to the power system K. Further, the processing device 42 cannot receive the value of the individual output power from the power conditioner 22C due to the effect of the communication disconnection of the two-way communication, and therefore, based on the value of the individual output power from the power conditioners 22A and 22B, Calculate the estimated point power. At this time, the estimated value of the connection point power is 300 kW, so that the processing device 42 continues the situation shown in FIG. Therefore, it can be seen that the power control is not properly performed in the conventional power system.

FIG. 8 shows the power control in the situation where the communication interruption shown in FIG. 6 has occurred, taking into account the response when the communication interruption occurs. That is, a case where power control of the power system S1 of the present disclosure is performed is shown. In the power system S1 of the present disclosure, the power conditioner 22C puts its own device (the power conditioner 22C) in a standby state when the value of the individual output power cannot be transmitted normally. That is, the inverter circuit 225a of the power conditioner 22C is stopped, and the output of power is stopped. Thus, power conditioner 22C, since even when receiving the control command value pr _B ^0.99 by one-way communication (UDP communication), not be successfully sent the value of the individual output power not output power. As a result, each of the power conditioners 22A and 22B outputs 150 kW, so that 300 kW of power is output from the power system S1 to the power system K. Therefore, it is understood that the power control is properly performed in the power system S1 of the present disclosure.

  If a control mode (for example, output suppression mode, peak cut mode, reverse power flow avoidance mode) in which a control command value is calculated using the connection point power detection value is set, the control command In the value calculation, the value of the individual output power from each of the power conditioners 12 and 22 is not used. Therefore, even when the processing device 42 cannot receive the value of the individual output power from each of the power conditioners 12 and 22 when the above-described control mode is set, the power control using the control command value is not particularly affected. Absent.

<Case 5: Communication interruption inside each power conditioner 12>
Next, a description will be given of a case where a communication disconnection occurs inside each power conditioner 12.

<Case 5-1: Communication interruption between information processing unit 124 and output control unit 125>
In each power conditioner 12, communication disconnection may occur between the information processing unit 124 and the output control unit 125. At this time, in the power conditioner 12 in which the communication disconnection has occurred, the output control unit 125 does not receive (cannot receive) the individual target value from the information processing unit 124. Therefore, the output control unit 125 does not know the target power value (individual target value) and cannot appropriately control the individual output power. Therefore, there is a possibility that the power system S1 cannot perform appropriate power control. For example, there is a possibility that a reverse power flow is generated or a power peak is increased in the power system S1 in which the reverse power flow is prohibited. Therefore, when the individual target value has not been input from the information processing unit 124 (cannot be received), the output control unit 125 puts its own device (the power conditioner 12) in a standby state. That is, the output control unit 125 stops the inverter circuit 125a and stops the output of power from the own device (the power conditioner 12). In the other power conditioners 12 in which the communication disconnection has not occurred, the output control unit 125 controls the individual output power based on the individual target value input from the information processing unit 124 as usual. Thereby, the power system S1 can suppress improper power control from being performed when the individual target value is not input from the information processing unit 124 to the output control unit 125. Therefore, occurrence of unintended reverse power flow and rise in power peak can be suppressed.

<Case 5-2: Communication disconnection between first communication unit 121 and output control unit 125>
In each power conditioner 12, a communication disconnection may occur between the output control unit 125 and the first communication unit 121. At this time, in the power conditioner 12 in which the communication interruption has occurred, the first communication unit 121 does not receive the value of the individual output power of the own device (the power conditioner 12) or the operation abnormality signal from the output control unit 125 (reception). Can not). Therefore, the first communication unit 121 cannot transmit these to the terminal device 41. However, the value of the individual output power or the operation abnormality signal transmitted from the first communication unit 121 to the terminal device 41 is not information related to the power control of the power system S1, and the power system S1 Control is continued.

<Case 5-3: Communication disconnection between first communication unit 121 and information processing unit 124>
In each power conditioner 12, communication disconnection may occur between the information processing unit 124 and the first communication unit 121. At this time, in the power conditioner 12 in which the communication disconnection has occurred, transmission and reception of signals between the first communication unit 121 and the information processing unit 124 cannot be performed. However, information related to power control using the control command value is not transmitted or received by communication between them. Therefore, the power system S <b> 1 continuously performs power control using the control command value even if a communication break occurs between the first communication unit 121 and the information processing unit 124.

<Case 5-4: Communication disconnection between second communication unit 122 and output control unit 125>
In each power conditioner 12, communication disconnection may occur between the output control unit 125 and the second communication unit 122. At this time, in the power conditioner 12 in which the communication disconnection has occurred, the second communication unit 122 does not receive the value of the individual output power from the output control unit 125 (cannot receive). Therefore, since the second communication unit 122 cannot transmit the value of the individual output power to the processing device 42, the same situation as the above-described communication disconnection in the bidirectional communication between the power conditioners 12, 22 and the processing device 42 occurs. . Therefore, when the value of the individual output power cannot be output (cannot be transmitted) to the second communication unit 122, the output control unit 125 puts its own device (the power conditioner 12) in a standby state. That is, the output control unit 125 stops the inverter circuit 125a and stops the output of power from the own device (the power conditioner 12). In the other power conditioners 12 in which the communication disconnection has not occurred, the second communication unit 122 transmits the value of the individual output power input from the output control unit 125 to the processing device 42 as usual. As a result, similarly to the case where the communication disconnection in the bidirectional communication has occurred (see Case 4-2), the power system S1 can suppress inappropriate power control.

<Case 5-5: Communication disconnection between second communication unit 122 and information processing unit 124>
In each power conditioner 12, a communication disconnection may occur between the information processing unit 124 and the second communication unit 122. At this time, in the power conditioner 12 in which the communication disconnection has occurred, the information processing unit 124 does not receive the control command value from the second communication unit 122. Therefore, the information processing unit 124 does not receive the control command value and cannot calculate the individual target value. Therefore, when the control command value is not input from the second communication unit 122, the information processing unit 124 instructs the output control unit 125 to put the own device (the power conditioner 12) into a standby state. As a result, similarly to the case where the communication disconnection in the one-way communication has occurred (see Case 4-1), the power system S1 can suppress the inappropriate power control from being performed.

  As shown in Case 5 above, in the power conditioner 12 in which the communication interruption has occurred internally, the inverter circuit 125a is stopped as necessary, and in the power conditioner 12 in which the communication interruption has not occurred internally, Power control is performed as usual. That is, the power conditioner 12 in which the communication disconnection has not occurred internally performs the power control continuously. Accordingly, even when a communication disconnection occurs inside the power conditioner 12, the power system S1 can continue power control using the control command value while suppressing inappropriate power control.

  In addition, each of the power conditioners 12 notifies the first communication unit that the communication disconnection has occurred when any one of the elements inside the power conditioner 12 (power conditioner 12) has lost the communication. The terminal device 41 is notified by 121 (transmitting unit 121b). Then, in response to the notification, the terminal device 41 notifies a warning that a communication disconnection has occurred inside the power conditioner 12.

<Case 6: Communication interruption inside each power conditioner 22>
Next, a case in which a communication disconnection occurs inside each power conditioner 22 will be described.

<Case 6-1: Communication disconnection between information processing unit 224 and output control unit 225>
In each power conditioner 22, communication disconnection may occur between the information processing unit 224 and the output control unit 225. At this time, in the power conditioner 22 in which the communication disconnection has occurred, the output control unit 225 does not receive (cannot receive) the individual target value from the information processing unit 224. Therefore, the output control unit 225 cannot know the target power value (individual target value), and cannot appropriately control the individual output power. Therefore, the power system S1 may not be able to perform appropriate power control in each of the power conditioners 12, as in the case where a communication disconnection occurs between the information processing unit 124 and the output control unit 125. Therefore, when the individual target value has not been input (cannot be received) from the information processing unit 224, the output control unit 225 sets the own device (the power conditioner 22) to a standby state. That is, the output control unit 225 stops the inverter circuit 225a, and stops the output of power from the own device (the power conditioner 22). In another power conditioner 22 in which communication has not been disconnected, the output control unit 225 controls the individual output power based on the individual target value input from the information processing unit 224 as usual. Thereby, the power system S1 can suppress that inappropriate power control is performed by not receiving the individual target value from the information processing unit 224 to the output control unit 225.

<Case 6-2: Communication disconnection between first communication unit 221 and output control unit 225>
In each power conditioner 22, communication disconnection may occur between the output control unit 225 and the first communication unit 221. At this time, in the power conditioner 22 in which the communication disconnection has occurred, the first communication unit 221 does not receive the value of the individual output power of the own device (the power conditioner 22) or the operation abnormal signal from the output control unit 225 (reception). Can not). Therefore, the first communication unit 221 cannot transmit these to the terminal device 41. However, since the value of the individual output power and the abnormal operation signal transmitted from the first communication unit 221 to the terminal device 41 are not information related to the power control of the power system S1, the power system S1 uses the power command using the control command value. Control is continued.

<Case 6-3: Communication interruption between first communication unit 221 and information processing unit 224>
In each power conditioner 22, communication disconnection may occur between the information processing unit 224 and the first communication unit 221. At this time, in the power conditioner 22 in which the communication disconnection has occurred, transmission and reception of signals between the first communication unit 221 and the information processing unit 224 cannot be performed. However, information related to power control using the control command value is not transmitted or received by communication between them. Therefore, the power system S <b> 1 continues to perform power control using the control command value even when communication is interrupted between the first communication unit 221 and the information processing unit 224.

<Case 6-4: Communication disconnection between second communication unit 222 and output control unit 225>
In each power conditioner 22, communication disconnection may occur between the output control unit 225 and the second communication unit 222. At this time, in the power conditioner 22 in which the communication disconnection has occurred, the second communication unit 222 does not receive (cannot receive) the value of the individual output power from the output control unit 225. Therefore, since the second communication unit 222 cannot transmit the value of the individual output power to the processing device 42, the same situation as the above-described communication disconnection in the bidirectional communication between the power conditioners 12, 22 and the processing device 42 occurs. . Therefore, when the value of the individual output power cannot be output (cannot be transmitted) to the second communication unit 222, the output control unit 225 sets its own device (the power conditioner 22) to a standby state. That is, the output control unit 225 stops the inverter circuit 225a, and stops the output of power from the own device (the power conditioner 22). In the other power conditioners 22 in which the communication disconnection has not occurred, the second communication unit 222 transmits the value of the individual output power input from the output control unit 225 to the processing device 42 as usual. As a result, similarly to the case where the communication disconnection in the bidirectional communication has occurred (see Case 4-2), the power system S1 can suppress inappropriate power control.

<Case 6-5: Communication interruption between second communication unit 222 and information processing unit 224>
In each power conditioner 22, communication disconnection may occur between the information processing unit 224 and the second communication unit 222. At this time, in the power conditioner 22 in which the communication disconnection has occurred, the information processing unit 224 does not receive the control command value from the second communication unit 222. Therefore, the information processing unit 224 does not receive the control command value and cannot calculate the individual target value. Therefore, when the control command value is not input from the second communication unit 222, the information processing unit 224 instructs the output control unit 225 to put the own device (the power conditioner 22) into a standby state. As a result, similarly to the case where the communication disconnection in the one-way communication has occurred (see Case 4-1), the power system S1 can suppress the inappropriate power control from being performed.

<Case 6-6: Communication interruption between state acquisition unit 223 and information processing unit 224>
In each power conditioner 22, communication between the state acquisition unit 223 and the information processing unit 224 may be interrupted. At this time, in the power conditioner 22 in which the communication disconnection has occurred, the information processing unit 224 does not receive the state of the storage battery 21 from the state acquisition unit 223 (cannot receive the state). Therefore, the information processing unit 224 cannot calculate an appropriate individual target value when calculating the individual target value by the above equation (3). As a result, the storage battery 21 is excessively charged and discharged, and the storage battery 21 may be deteriorated or damaged. Therefore, when the state of the storage battery 21 is not input (cannot be received) from the state acquisition unit 223, the information processing unit 224 instructs the output control unit 225 to output the power from the own device (the power conditioner 22) in the standby state. Instruct the user to This suppresses excessive charging / discharging of the storage battery 21 and suppresses deterioration or damage of the storage battery 21.

  As shown in Case 6 above, in the power conditioner 22 in which the communication interruption has occurred internally, the inverter circuit 225a is stopped as necessary, and in the power conditioner 22 in which the communication interruption has not occurred internally, Power control is performed as usual. That is, the power conditioner 22 in which the communication disconnection has not occurred internally performs the power control continuously. As a result, the power system S1 can continue the power control using the control command value while suppressing inappropriate power control, even when communication is interrupted inside the power conditioner 22.

  When the power conditioner 22 has lost the communication between any of the elements inside the device (the power conditioner 22), the first communication unit reports that the communication loss has occurred. 221 (transmitting unit 221b) notifies the terminal device 41. Then, in response to the notification, the terminal device 41 notifies a warning that a communication disconnection has occurred inside the power conditioner 22.

<Case 7: Other communication errors other than communication interruption>
Next, a case will be described in which another communication abnormality other than the communication interruption described in Cases 1 to 6 occurs.

<Case 7-1: Signal abnormality during communication of control command value>
In the present embodiment, each of the power conditioners 12 and 22 receives the control command value transmitted from the processing device 42. When each of the power conditioners 12 and 22 receives the control command value from the processing device 42, the information processing units 124 and 224 detect an error in the received control command value. The method of error detection is not particularly limited, and a known method may be used. Then, when an error in the received signal is detected by the error detection, the information processing units 124 and 224 wait for the output control units 125 and 225 to output power from their own devices (the power conditioners 12 and 22). Instruct the state. Thereby, the power system S1 can suppress that inappropriate power control is performed due to the signal abnormality.

  In addition, when the information processing units 124 and 224 detect an abnormality of the received signal, the power conditioners 12 and 22 notify the terminal devices by the first communication units 121 and 221 (the transmission units 121b and 221b). Notify 41. Then, based on the notification, the terminal device 41 notifies the notification unit 413 that the control command value could not be normally transmitted from the processing device 42 to each of the power conditioners 12 and 22.

<Case 7-2: Address error>
When performing bidirectional communication (Modbus communication) from the processing device 42 to each of the power conditioners 12 and 22, the processing device 42 accesses a predetermined IP address of each of the power conditioners 12 and 22. However, it is conceivable that the processing device 42 accesses an IP address different from the predetermined IP address. Therefore, when the second communication units 122 and 222 detect that such an IP address different from the normal time has been accessed, the second communication units 122 and 222 transmit the power from their own devices (the power conditioners 12 and 22) to the output control units 125 and 225. To put the output of the device in a standby state. Thereby, the power system S1 can suppress that inappropriate power control is performed due to the address abnormality.

  The above-described case 7 (cases 7-1 and 7-2) is an example, and the present invention is not limited to this. For example, in the above-described cases 1 to 6, communication may not be performed normally due to a signal error or address error transmitted / received by communication instead of a communication break between devices or each unit inside each device. As described above, even when various signals cannot be transmitted or received normally due to a signal abnormality or an address abnormality, the power system S1 operates improperly by operating in the same manner as the power control shown in the above cases 1 to 6. It is possible to suppress that the power control is performed.

  The power system S1 of the present disclosure performs power control different from the normal time as described above when communication between devices or between elements inside each device is not performed normally. It is configured. Thus, even when a communication error occurs, the power system S1 can continue to operate without stopping power control using the control command value.

  The power system S1 of the present disclosure performs power control continuously to the extent that inappropriate power control is not performed when a communication abnormality that affects power control using a control command value occurs. When a communication abnormality that does not affect the power control using the command value occurs, the power control is continuously performed as usual. This makes it possible to take appropriate measures for power control using the control command value in accordance with the location where the communication abnormality has occurred.

In the above embodiment, the case where the power system S1 includes the plurality of power conditioners 22 has been described, but the power system S1 may not include the plurality of power conditioners 22. In this case, the processing device 42 calculates a control command value (control command value pr _PV ) and transmits the calculated control command value pr _PV to each of the plurality of power conditioners 12, as in the above embodiment. Then, the plurality of power conditioners 12 calculate the individual target values P _PVi ^ref based on the optimization problem shown in the following equation (1 ′) instead of the optimization problem shown in the above equation (1). In the following equation (1 ′), P _i ^SP indicates the amount of power generated by the i-th solar cell 11. Thereby, the same effect as the above embodiment can be obtained.

  In the above-described embodiment, the case where the terminal device 41 and the processing device 42 are different devices in the power system S1 has been described. However, the present invention is not limited to this, and the terminal device 41 and the processing device 42 are configured by one computer. May be. In this case, each of the terminal device 41 and the processing device 42 does not need to be connected to the WAN 81.

  In the above embodiment, the case where the power system S1 of the present disclosure includes the power conditioner 12 to which the solar cell 11 is connected, that is, the case where the power system S1 is a solar power generation system, has been described. Not limited. The power system according to the present disclosure is, for example, a power generation system using other renewable energy (wind power, hydropower, biomass, geothermal, etc.), a power generation system using a fuel cell, a power generation system using fossil fuel, a rotary-type generator , A virtual power generation system that manages the load on customers by an aggregator that performs negawatt transactions, various cogeneration systems, or a power system that uses an EV (Electric Vehicle) stand. The aggregator does not actually generate power, but regards the power saved by the negawatt transaction as the generated power. The EV stand is a facility for charging and discharging an EV or a plug-in hybrid electric vehicle (PHEV). The EV stand does not actually generate power, but discharges power stored in the EV or PHEV and regards this power as generated power. Even in the case of these power systems, the processing device 42 derives a control command value and transmits the control command value to each power control device. Then, the power control device of each power system calculates the individual target value of the own device based on the optimization problem using the received control command value, and controls the individual output power to be the individual target value. . In the case of a power generation system using renewable energy or a power generation system using a fuel cell, the power control device is a power conditioner like the power system S1. In the case of a power generation system using a rotating machine type generator or various cogeneration systems, the power control device is a generator and a control device that controls the generator. In the case of a power generation system using an aggregator, the power control device is a load on a customer and a control device for controlling the load. In the power generation system using the aggregator, the power that has been saved is regarded as the generated power, and thus the power that is reduced from the normal power consumption of the consumer load is the individual output power. In the case of a power system using an EV stand, the power control device is an EV stand to which an EV or PHEV is connected and a control device for controlling the EV stand. In an electric power system using an EV stand, a battery provided in an EV or PHEV may correspond to the storage battery 21, and the EV stand and a control device for controlling the EV stand may correspond to the power conditioner 22. Further, the electric power system according to the present disclosure may be a combination of the above-described power generation system. For example, a rotating machine type generator is added to the photovoltaic power generation system, and the processing device 42 transmits a control command value to each power conditioner of the photovoltaic power generation system and a power control device of the power generator, and Power control may be performed.

  The power system and the processing device according to the present disclosure are not limited to the above embodiments, and the specific configuration of each unit can be freely changed in various ways without departing from the contents described in the claims. is there.

S1: power system 11: solar cell 12: power conditioner 121: first communication unit 121a: reception unit 121b: transmission unit 122: second communication unit 122a: reception unit 122b: transmission unit 124: information processing unit 125: output control Unit 125a: Inverter circuit 125b: Transformer 125c: Detection circuit 125d: Control circuit 129: Communication bus 21: Storage batteries 22, 22A to 22C: Power conditioner 221: First communication unit 221a: Receiving unit 221b: Transmitting unit 222: First 2 communication unit 222a: reception unit 222b: transmission unit 223: state acquisition unit 224: information processing unit 225: output control unit 225a: inverter circuit 225b: transformer 225c: detection circuit 225d: control circuit 229: communication bus 3: power receiving equipment 31: communication unit 31a: reception unit 31b: transmission unit 32 Detecting unit 33: auxiliary relay 34: control unit 41: terminal device 411: communication unit 411a: receiving unit 411b: transmitting unit 412: operation unit 413: notification unit 414: control unit 42: processing device 421: first communication unit 421a: Receiving unit 421b: transmitting unit 422: second communication unit 422a: receiving unit 422b: transmitting unit 423: storage unit 424: setting unit 425: calculating unit 426: deriving unit 429: communication bus 90: power line H1: network hub H2: network Hub K: Power system L: Power load

Claims (8)

A power system that is connected to a power system and performs power control of connection point power that is power at a connection point with the power system,
A detection device for detecting the value of the connection point power,
A processing device that derives a control command value for setting the value of the connection point power to a set adjustment target value,
Each is connected to the connection point, and, based on an optimization problem using the control command value, a plurality of power control devices that control output power,
With
The processing device includes:
A processing device receiving unit capable of receiving the value of the connection point power from the detection device,
A value of the connection point power received by the processing device receiving unit, and a calculation unit based on the adjustment target value according to a control mode for the power control, a derivation unit that derives the control command value,
A processing device transmitting unit that transmits the control command value derived by the deriving unit to each of the plurality of power control devices,
With
The deriving unit, when the processing device receiving unit cannot normally receive the value of the connection point power, derives a setting value according to the control mode as the control command value,
An electric power system, characterized in that: The plurality of power control devices include a power generation control device to which a power generation device is connected,
The power generation control device is capable of outputting power input from the power generation device,
The control mode includes a peak cut mode for suppressing a peak value of power input from the power system to the power system, and a reverse power flow avoidance for avoiding a reverse power flow from the power system to the power system. Mode,
The deriving unit derives a value that does not cause the power generation control device to suppress the output power, as a set value according to the peak cut mode, and outputs the output power to the power generation control device as a set value according to the reverse power flow avoidance mode. Derive a value that suppresses
The power system according to claim 1. The plurality of power control devices further include a storage battery control device to which a storage battery is connected,
The storage battery control device controls charging and discharging of the storage battery,
The deriving unit derives a value at which the storage battery control device does not charge the storage battery as a set value according to the peak cut mode, and sets the storage battery control device as the set value according to the reverse power flow avoidance mode. Derive a value that does not discharge
The power system according to claim 2. Each of the plurality of power control devices,
A power control device receiving unit capable of receiving the control command value from the processing device,
By calculating the optimization problem, an information processing unit that calculates an individual target value that is a target value of the output power,
An output control unit that controls the output power so that the value of the output power becomes the individual target value,
With
The information processing unit, when the power control device receiving unit can not receive the control command value normally, to stop the output of the power to the output control unit,
The power system according to claim 3. The output control unit further includes an output power detection unit that detects a value of the output power,
Each of the plurality of power control devices,
It further includes a power control device transmission unit that transmits the value of the output power detected by the output power detection unit to the processing device,
The information processing unit, when the power control device transmission unit can not normally transmit the value of the output power, the output control unit to stop the output of power,
The power system according to claim 4. A terminal device capable of communicating with the processing device,
The terminal device,
An instruction unit that instructs the adjustment target value according to the control mode;
A terminal device transmission unit that transmits the adjustment target value instructed by the instruction unit to the processing device,
With
The control mode does not suppress the output power to the power generation control device, and further includes an emergency mode for power control so that the storage battery control device does not charge and discharge the storage battery,
The processing device receiving unit is capable of receiving the adjustment target value transmitted from the terminal device,
The deriving unit operates in the emergency mode as the control mode when the processing device receiving unit cannot receive the adjustment target value normally.
The power system according to claim 5. The storage battery control device,
It further includes a state acquisition unit that acquires a charge rate of the storage battery and outputs the charge rate to the information processing unit of the storage battery control device,
The information processing unit of the storage battery control device,
When calculating the individual target value, the charging rate is used, and when the charging rate is not input from the state acquisition unit, the output control unit stops outputting power.
The power system according to any one of claims 4 to 6. By transmitting a control command value for setting a value of a connection point power, which is power at a connection point with the power system, to an adjustment target value, to the plurality of power control devices connected to the power system, A processing device that controls each of the control devices to control output power based on an optimization problem using the control command value,
A processing device receiving unit that can receive the value of the connection point power from a detection device that detects the value of the connection point power,
A value of the connection point power received by the processing device receiving unit, and a calculation based on the adjustment target value according to the set control mode, a derivation unit that derives the control command value,
A processing device transmitting unit that transmits the control command value derived by the deriving unit to each of the plurality of power control devices,
With
The deriving unit, when the processing device receiving unit cannot normally receive the value of the connection point power, derives a setting value according to the control mode as the control command value,
A processing device characterized by the above-mentioned.

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