JP2014161172A - Control method for power distribution system and information processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent power fluctuation in a power system without limiting a power selling amount of a power generation facility on the user side.SOLUTION: A power distribution system 1 including a transformer 4, a plurality of users 5 supplied with power from a low voltage line 3, a power generation facility 51 provided in the user 5, a storage battery 10 provided together with the transformer 4, a generated power supply line 71 on which a changeover switch 20 for selecting one of the storage battery 10 and the low voltage line 3 to supply generated power of the power generation facility 51 is provided, and a storage battery discharge power supply line 6 on which an on/off switch 30 for controlling presence/absence of power supply of the storage battery 10 to the low voltage line 3 comprises a control device 100 for controlling a power storage amount of the storage battery 10, voltage of the low voltage line 3, and a power supply state of the low voltage line 3 by controlling at least any of the changeover switch 20 and on/off switch 30 according to at least any of the power storage amount of the storage battery 10, voltage of the low voltage line 3, and power supply state of the low voltage line.

Description

  The present invention relates to a method for controlling a power distribution system and an information processing apparatus, and more particularly to a technique for suppressing power flow fluctuations in an electric power system without limiting the amount of power sold in a power generation facility provided on a consumer side such as a solar power generation apparatus.

  In recent years, the full purchase system of renewable energy (fixed price purchase system) has also been boosted, and the introduction of power generation facilities (distributed power supply) for consumers such as solar power generators for household use is rapidly progressing. However, when a large number of power generation facilities are connected to the power system, a large amount of reverse power flow is generated, which increases the possibility of deviating from the voltage specified in the technical standards for electrical facilities.

  Regarding the technology for suppressing the reverse power flow, for example, in Patent Document 1, a power storage device is installed on the low voltage side of the pole transformer that connects the high voltage line to the low voltage line of the distribution system, It is described that charging / discharging for fluctuations in power flow prevents reverse power flow from the low voltage line to the high voltage line and reduces the voltage increase of the high voltage line.

  Further, in Patent Document 2, in a distribution system in which a large number of photovoltaic power generation systems are connected, in order to minimize the amount of output suppression of all consumers of the distribution system and correct the inequality of the amount of output suppression between consumers, Measure the PCS (power conditioner) terminal voltage of all consumers in a region at a certain time, calculate the difference between the terminal voltage of the PCS of the consumer that showed the highest voltage and the voltage management value, and calculate the highest voltage The set value of the PCS of the shown consumer is set to the same value as the voltage control value, and the set value of the PCS of the other consumer is set to a value obtained by adding the difference to each of the measured voltages. It is described that the value is set.

JP 2012-39774 A JP 2012-70598 A

  By the way, if the output of the power generation equipment on the customer side is suppressed for the purpose of maintaining the supply and demand balance of the entire distribution system, for example, as in Patent Document 2, the effect of introducing the power generation equipment on the customer side is impaired. It will end up. In particular, in the full-volume purchase system, the purchase price of electric power sold is determined on the assumption that the power generation equipment will continue to exhibit its expected performance for a long period (about 10 years or more). The willingness to introduce is greatly diminished, and as a result, there are concerns about the impact on the promotion of green power facilities.

  The present invention has been made in view of such a background, and it is possible to control a power distribution system capable of suppressing power flow fluctuations in an electric power system without limiting the amount of power sold by a power generation facility provided on a customer side. It is an object to provide a method and an information processing apparatus.

  One aspect of the present invention for achieving the above object is a control method of a power distribution system, which transforms power supplied from a high-voltage line and supplies it to a low-voltage line, and supplies power through the low-voltage line. A plurality of consumers who receive the power generation facility provided in the consumer, a storage battery provided corresponding to the transformer, and select either the storage battery or the low-voltage line for the generated power of the power generation facility A supply line for generated power provided with a changeover switch for supply, and a supply line for discharge power of the storage battery provided with an on / off switch for controlling whether or not the power stored in the stored electricity value is supplied to the low-voltage line; Detecting at least one of a storage amount of the storage battery, a voltage of the low-voltage line, and a power supply state of the low-voltage line, and a small number of the switch, the change-over switch, and the on-off switch. In the power distribution system configured to include a control device, the control device controls at least one of the changeover switch and the on / off switch according to a detection value of the sensor. Thus, at least one of the storage amount of the storage battery, the voltage of the low voltage line, and the power supply state of the low voltage line is controlled.

  According to the present invention, the control device controls the changeover switch and the on / off switch according to at least one of the storage amount of the storage battery, the voltage of the low-voltage line, and the supply state of the power by the low-voltage line, and the storage of the storage battery Since at least one of the quantity, the voltage of the low-voltage line, and the supply state of the power by the low-voltage line is adjusted, the generated power of the power generation facility of the consumer can be used effectively. In addition, by storing the generated power of the power generation facility in the storage battery, the generated power can be used as the amount of power sold without waste, so there is no need to force consumers to reduce the amount of power sold. There is no loss of willingness to introduce. Moreover, the voltage of a low voltage line can be adjusted using the electric power stored in the storage battery, and the stable supply of electric power can be achieved. Further, since the storage battery is interposed as a buffer between the high voltage line and the power generation facility, fluctuations in power flow on the high voltage line side are also suppressed.

  Another aspect of the present invention is the above-described control method, wherein the control device is configured such that a storage amount of the storage battery is less than a preset charge target amount, and the voltage of the low-voltage line is set in advance. When the upper limit value of the suitable range is exceeded, the changeover switch is controlled so that the generated power of the power generation facility is supplied to the storage battery.

  As described above, when the storage amount of the storage battery is less than the preset charge target amount and the voltage of the low voltage line exceeds the upper limit value of the preset aptitude range, the control device Since the generated power is supplied to the storage battery to charge the storage battery, the power generated by the power generation facility can be sold effectively. At this time, since the low voltage line is disconnected from the power generation facility, the voltage of the low voltage line is not affected by the generated power, and the power can be stably supplied to the consumer.

  Another aspect of the present invention is the above-described control method, wherein the control device is configured such that a storage amount of the storage battery is equal to or greater than a preset charge target amount, and the voltage of the low-voltage line is electrical equipment. When the upper limit value of the specified voltage in the technical standard is exceeded and the storage battery is not fully charged, the changeover switch is controlled so that the generated power of the power generation facility is supplied to the storage battery.

  Thus, even if the storage amount of the storage battery is equal to or greater than the target charge amount, if the voltage of the low voltage line exceeds the upper limit value of the voltage specified in the electrical equipment technical standard, the control device is not fully charged. As long as the storage battery is charged by supplying the generated power of the power generation facility to the storage battery, it is possible to reliably prevent an increase in the voltage of the low-voltage line. In addition, consumers can effectively sell the power generated by the power generation equipment.

  Another aspect of the present invention is the above-described control method, wherein when the voltage of the low-voltage line falls below a lower limit value of a preset suitability range, the control device generates power generated by the power generation facility. The changeover switch is controlled so as to be supplied to the low-voltage line.

  Thus, when the voltage of the low voltage line becomes less than the lower limit value of the appropriate range, the control device supplies the generated power of the power generation facility to the low voltage line, so the voltage of the low voltage line is reduced using the generated power of the power generation facility. Can be prevented.

  Another aspect of the present invention is the above-described control method, wherein the control device is configured such that a storage amount of the storage battery is equal to or greater than a preset charge target amount, and the voltage of the low-voltage line is preset. The on / off switch is controlled so that electric power is supplied from the storage battery to the low-voltage line when it is less than the lower limit value of the appropriate aptitude range.

  Thus, when the storage amount of the storage battery is equal to or greater than the preset charge target amount and the voltage of the low voltage line is less than the lower limit value of the preset aptitude range, the control device is stored in the storage battery. Since the electric power currently supplied is supplied to a low voltage line, the fall of the voltage of a low voltage line can be suppressed using the electric power stored in the storage battery. In addition, the power stored in the storage battery will be exchanged between the consumers who are receiving power supply from the same transformer, and the supply and demand balance can be adjusted between the consumers connected to the same transformer. .

  Another aspect of the present invention is the above-described control method, wherein the control device is configured to supply power to the low-voltage line when a storage amount of the storage battery is less than a preset charge target amount. When trouble occurs, the on / off switch is controlled so that electric power is supplied from the storage battery to the low-voltage line.

  As described above, even when the storage amount of the storage battery is less than the preset charge target amount, when the supply of power to the low voltage line is hindered, the control device reduces the power stored in the storage battery to a low pressure. Since it is made to supply to a line, the trouble which has arisen in the low voltage line can be solved quickly.

  Another one of the present invention is the above-described control method, wherein the control device is configured such that when power is supplied from the storage battery to the low-voltage line, a charge target in which a storage amount of the storage battery is set in advance. The on / off switch is controlled so that power is not supplied from the storage battery to the low-voltage line when the voltage of the low-voltage line exceeds the upper limit value of the preset aptitude range.

  As described above, when power is supplied from the storage battery to the low-voltage line, if the storage amount of the storage battery becomes less than the preset charge target amount and the voltage of the low-voltage line exceeds the upper limit value of the appropriate range, the control is performed. The device controls the on / off switch so that power is not supplied from the storage battery to the low-voltage line, so that the storage amount of the storage battery can be kept appropriate, and the voltage of the low-voltage line deviates from the appropriate range. Can be prevented.

  Another aspect of the present invention is the above-described control method, wherein the power distribution system is provided in the generated power supply line, and a current flows only in a direction from the generated power supply line toward the input side of the stored value. A first unidirectional element that allows a current to pass through, and a second unidirectional element that is provided in the storage battery output supply line and that allows a current to pass only in a direction from the output side of the storage battery toward the low-voltage line, It shall be provided with at least one of these.

  Another aspect of the present invention is the power distribution system, wherein the power distribution system includes a converter that converts alternating current power output from the power generation facility into direct current power and supplies the direct current power to the storage battery, and the storage battery. And an inverter that converts the output DC power into AC power and supplies the AC voltage to the low-voltage line.

  In addition, the subject which this application discloses, and its solution method are clarified by the column of the form for inventing, and drawing.

  ADVANTAGE OF THE INVENTION According to this invention, the tidal current fluctuation | variation of an electric power grid | system can be suppressed, without restrict | limiting the electric power sales amount of the power generation equipment provided in the consumer side.

1 is a diagram illustrating a schematic configuration of a power distribution system 1. FIG. 4 is a diagram illustrating an example of a converter 41, an inverter 42, a first unidirectional element 44, and a second unidirectional element 45. FIG. It is a figure which shows the main hardware with which the control apparatus 100 is provided. It is a figure which shows the main functions with which the control apparatus 100 is provided. It is a flowchart explaining charge process S500. It is a figure which shows the relationship between the prescription | regulation range and suitable range in case the rated value of the voltage of the low voltage | pressure wire 3 is 100V. It is a flowchart explaining electric discharge processing S700.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of a power distribution system 1 described as an embodiment of the present invention. As shown in the figure, the power distribution system 1 transforms high-voltage (for example, 6600V) power supplied from a high-voltage line 2 (high-voltage distribution line) of an electric power system operated by an electric power company or the like into a voltage (for example, 200V, 100V). A plurality of transformers 4 (post transformers, ground transformers, etc.) that supply to the low-voltage line 3 (low-voltage distribution line) and a part of the low-voltage line 3 and receive power supply from the transformer 4 A plurality of power purchase wirings 61 to be supplied to each of the consumers 5 and a plurality of power supplies generated by the power generation equipment 51 installed on the customer 5 side to either the low voltage line 3 or the storage battery 10 to be described later. Power storage wiring 71 (generated power supply line) and a storage battery 10 that is charged by the power supplied through the power sales wiring 71 and is provided corresponding to the transformer 4.

  The consumer 5 is, for example, a general household, an organization such as a company or a public office, a factory, or the like. The power generation facility 51 is, for example, a solar power generation device, a wind power generation device, a hydropower generation device, a biomass power generation device, a geothermal power generation device, a wave power generation device, or the like.

  The storage battery 10 is a secondary battery (for example, a lead storage battery, a redox flow battery, a sodium sulfur battery (NAS battery), a nickel metal hydride battery, a lithium ion battery), which is charged by the generated power of the power generation equipment 51 of each customer 5. These include electric double layer capacitors, flywheel batteries, and superconducting magnetic energy storage (SMES). In addition, the capacity | capacitance of the storage battery 10 is set, for example to the kWh value comparable as the kVA value of the transformer 4 (For example, if the capacity | capacitance of the transformer 4 is 30 kVA, the capacity | capacitance of the storage battery 10 is set to about 30 kWh. )

  The power distribution system 1 is stored in the changeover switch 20 and the storage battery 10 that are provided in the power sale wiring 71 and select and supply either the storage battery 10 or the low voltage line 3 as the supply destination of the generated power of the power generation facility 51. The storage battery discharge power supply line 6 and the storage battery discharge power supply line 6 are connected to the low voltage line 3, and the power stored in the storage battery 10 is supplied to the low voltage line 3 (with the output side of the storage battery 10 and The AC power supplied through the on / off switch 30 and the power sale wiring 71 is converted into the DC power supplied to the storage battery 10, the converter 41, the DC power supplied from the storage battery 10 is switched. Current is passed only in the direction from the inverter 42 and the power sale wiring 71 toward the input side of the storage battery 10, which is converted into AC power supplied to the low-voltage line 3 (from the input side of the storage battery 10 The current flows in the direction of the electrical wiring 71), the first unidirectional element 44 (for example, a power diode), and the current passes only in the direction from the output side of the storage battery 10 to the low-voltage line 3. A second unidirectional element 45 (for example, a power diode) or the like is included (which prevents backflow of current in the direction from the low voltage line 3 toward the output side of the storage battery 10).

  As shown in the figure, each customer 5 has a PCS 52 (PCS: Power Conditioning Subsystem) that outputs AC power based on the power generated by the power generation facility 51, and the current of the customer 5 based on the current flowing through the power purchase wiring 61. A purchased power meter 54 that measures the purchased power amount and a sold power meter 55 that measures the sold power amount of the consumer 5 based on the current flowing through the power sale wiring 71 are provided. The PCS 52 includes, for example, an inverse conversion device and a protection device for interconnection.

  The power distribution system 1 includes a power generation amount monitoring sensor that acquires the current power generation amount (generator output) of each power generation facility 51, a low voltage line voltage sensor that acquires the current voltage of the low voltage line 3, and the current power storage amount of the storage battery 10. (SOC (State Of Charge)) (SOC (full charge at 100%, half charge at 50%) (SOC: State Of Charge)) (this is a voltage that measures the voltage across the terminals of the storage battery 10, for example) And a low-voltage line state monitoring sensor (hereinafter, expressed by a supply reliability obtained by using parameters such as power failure presence / absence, instantaneous power failure / flicker presence / absence, etc.) Are referred to as various sensors 200), for example, the low voltage line 3, the transformer 4, the customer 5, the power purchase wiring 61, the power sale wiring 71, the changeover switch 20, the on / off switch 30, and the central control station of the electric power company , Substation, electric Prepare for key points. Each of the various sensors 200 is connected to be able to communicate with the control device.

  In addition, the power distribution system 1 includes a control device 100 configured using one or more information processing devices that are communicably connected to the various sensors 200, the purchased power meter 54, and the sold power meter 55. . Note that all or part of the hardware of the control device 100 is, for example, in a central point of a power company, a substation, a utility pole, a transformer 4, a storage battery 10, a customer 5, a low voltage line 3, a PCS 52, or the like. Provided. The control device 100 may be realized by a single information processing device, or may be realized by a cooperative operation of a plurality of information processing devices connected to be communicable. For example, the PCS 52 may be configured to perform all or part of the functions of the control device 100.

  FIG. 2 shows a circuit configuration of the converter 41, the inverter 42, the first unidirectional element 44, and the second unidirectional element 45 described above. The circuit configurations of the converter 41, the inverter 42, the first unidirectional element 44, and the second unidirectional element 45 are not limited to those shown in FIG. These specific functions and necessity are appropriately selected or determined according to the configuration of the power generation equipment 51, the PCS 52, and the like.

  In this circuit, the first unidirectional element 44 is realized by three diodes Da, Db, Dc provided corresponding to each phase. As shown in the figure, each of the diodes Da, Db, and Dc is provided so as to allow only a current flowing from the changeover switch 20 to the storage battery 10 to pass therethrough.

  Further, in this circuit, the converter 41 is realized by a three-phase full-wave rectifier circuit constituted by three combinations (SRa1 and SRa2, SRb1 and SRb2, SRc1 and SRc2) of two thyristors provided for each phase. Yes.

  In this circuit, the second unidirectional element 45 is realized by three diodes Dd, De, Df provided corresponding to each phase. As shown in the figure, each of the diodes Dd, De, Df is provided so as to pass only the current flowing from the storage battery 10 in the direction of the on / off switch 30.

  In this circuit, the inverter 42 is realized by a voltage-type inverter constituted by three combinations (SRd1 and SRd2, SRe1 and SRe2, SRf1 and SRf2) of two thyristors provided for each phase. As shown in the figure, free wheel diodes Dd1, Dd2, and De1 are provided between the terminals of thyristors SRd1, SRd2, SRe1, SRe2, SRf1, and SRf2, respectively, in order to feed back the delayed current component of the inductive load to the DC power supply. , De2, Df1, and Df2. The capacitor C shown in the figure is for smoothing.

  The control device 100 receives values (information) from the above-described various sensors (power generation amount monitoring sensor, low voltage line voltage sensor, power storage amount monitoring sensor, low voltage line state monitoring sensor), purchased power meter 54, and sold power meter 55. Based on the acquired value, the devices and facilities constituting the power distribution system 1 such as the transformer 4, the storage battery 10, the changeover switch 20, the on / off switch 30, the converter 41, the inverter 42, the power generation facility 51, and the PCS 52 Control.

  FIG. 3 shows main hardware included in the control device 100. The control device 100 is configured based on an information processing device (computer). As shown in the figure, the control device 100 includes a central processing unit 101, a storage device 102, a communication circuit 103, and a control circuit 104.

  The central processing unit 101 is, for example, a CPU or MPU. The storage device 102 is a semiconductor storage device, a magnetic recording device, an optical recording device, or the like. The communication circuit 103 includes a communication module corresponding to various communication methods, and is connected to other devices (various sensors 200, the transformer 4, the changeover switch 20, the on / off switch 30, the PCS 52, etc.) with a LAN and a power line. Communication is performed via communication (PLC), the Internet, a dedicated line, a public communication network, and the like. In response to an instruction from the central processing unit 101, the control circuit 104 communicates with other devices (such as the changeover switch 20, the on / off switch 30, and the PCS 52) to control these operations.

  FIG. 4 shows main functions provided in the control device 100. As shown in the figure, the control device 100 includes functions of an integrated control processing unit 411, a storage battery charging processing unit 412, and a storage battery discharging processing unit 413. Note that these functions are performed by the central processing unit 101 reading and executing a program stored in the storage device 102, by the hardware function of the control device 100, or by the control device 103 described above. And by controlling various facilities.

  The integrated control processing unit 411 adjusts the amount of electric power sold or purchased for each customer 5 in order to adjust the supply and demand balance (hereinafter referred to as integrated control) for the whole or a part of the power system. In the present embodiment, the integrated control is performed in preference to the processing performed by the storage battery charge processing unit 412 and the processing performed by the storage battery discharge processing unit 413 in principle.

  The storage battery charge processing unit 412 is a changeover switch according to at least one of the storage amount (SOC) of the storage battery 10, the voltage of the low voltage line 3, and the power supply state of the low voltage line 3 detected by the various sensors 200. 20 is performed, and a process related to charging of the storage battery 10 by the power generated by the power generation facility 51 (charge process S500 described later) is performed.

  The storage battery discharge processing unit 413 is an on / off switch according to at least one of the storage amount (SOC) of the storage battery 10, the voltage of the low voltage line 3, and the power supply state of the low voltage line 3 detected by the various sensors 200. 30 is controlled to perform a process related to the discharge of the electric power stored in the storage battery 10 (discharge process S700 described later).

  Next, in the power distribution system 1 having the above configuration, a process performed mainly by the control device 100 will be specifically described.

  FIG. 5 is a flowchart for explaining one of the processes performed by the control device 100 (hereinafter referred to as a charging process S500). The control device 100 repeatedly executes this charging process S500.

  As shown in the figure, the control device 100 first determines whether or not the power generation facility 51 is currently generating power based on the value input from the power generation amount monitoring sensor described above (the generator output is obtained from the power generation facility 51). (Or whether or not a generator output equal to or higher than a preset threshold value is obtained from the power generation facility 51) is determined (S511).

  If it is determined that the power generation facility 51 is currently generating power (S511: YES), then the control device 100 determines whether the integrated control by the integrated control processing unit 411 is currently being executed (S512). . If integrated control is currently being executed (S512: YES), the process returns to S511. If integrated control is not currently being executed (S512: NO), the process proceeds to S513.

  In S513, the control device 100 determines whether or not the storage battery 10 is currently being discharged. The control device 100 makes this determination based on, for example, the contact state of the on / off switch 30, the operating state of the inverter 42, the output current of the storage battery 10, and the like. If the storage battery 10 is currently discharging (S513: YES), the process returns to S511. If the storage battery 10 is not currently discharging (S513: NO), the process proceeds to S514.

  In S514, control device 100 determines whether or not the SOC of storage battery 10 is currently less than a preset charge target amount based on the value input from the above-described storage amount monitoring sensor. If the SOC of the storage battery 10 is currently less than the target charge amount (S514: YES), the process proceeds to S515. On the other hand, when the SOC of the storage battery 10 is equal to or greater than the charge target amount (S514: NO), the process proceeds to S531.

  The charge target amount is set to 30 to 50% of the capacity of the storage battery 10, for example. For example, when the capacity of the transformer 4 is 30 kVA and about 10 households (customers 5) are connected to the transformer 4, an average of 1 kW of power is consumed per power outage. Moreover, the electric power of about 1 to 1.5 hours can be compensated by the storage battery 10.

  In S515, the control device 100 determines whether or not the voltage of the low-voltage line 3 exceeds the upper limit value of the preset aptitude range based on the value input from the low-voltage line voltage sensor described above. If the voltage of the low voltage line 3 does not exceed the upper limit value of the appropriate range, the process waits until the voltage of the low voltage line 3 exceeds the upper limit value of the appropriate range (S515: NO). If the voltage of the low voltage line 3 does not exceed the upper limit value of the aptitude range, the process returns to S511 instead of waiting until the voltage of the low voltage line 3 exceeds the upper limit value of the aptitude range. Also good.

  The suitability range is a standard indicating the suitability range of the voltage of the low voltage line 3. For example, when the rated value of the voltage of the low-voltage line 3 is 100V, the range of the specified voltage in the electrical equipment technical standard (hereinafter also referred to as the specified range) is 101V ± 6V = 95V to 107V. The upper limit value of the aptitude range is set to 104V that is 3V lower than the upper limit value of the specified range, and the lower limit value of the aptitude range is set to 98V that is 3V higher than the lower limit value of the specified range.

  FIG. 6 shows an example of the relationship between the specified range and the appropriate range when the rated value of the voltage of the low-voltage line 3 is 100V.

  If it is determined in S515 that the voltage of the low voltage line 3 exceeds the upper limit value of the appropriate range (S515: YES), the control device 100 switches the changeover switch 20 so that the generated power of the power generation facility 51 is supplied to the storage battery 10. (S516), and charging of the storage battery 10 is started (S517).

  Thus, the control apparatus 100 is that the storage amount of the storage battery 10 is less than the preset charge target amount (S514: YES), and the voltage of the low voltage line 3 exceeds the upper limit value of the preset aptitude range. (S515: YES), the power generated by the power generation facility 51 is supplied to the storage battery 10 to charge the storage battery 10, so that the power generated by the power generation facility 51 can be sold effectively (power generation facility). The electric power supplied from 51 to the storage battery 10 is measured by the electric power sales meter 55 as the electric power sales power). For this reason, in the consumer 5, the introduction effect and the willingness to introduce the power generation facility 51 can be enhanced, and the introduction of the green power facility can be promoted. At this time, since the low-voltage line 3 is disconnected from the power generation facility 51, the voltage of the low-voltage line 3 is not affected by the generated power of the power generation facility 51, and power can be stably supplied to the customer 5. it can.

  After the charging of the storage battery 10 is started, the control device 100 monitors in real time whether or not the SOC of the storage battery 10 has reached the charge target amount or more (S518). When it is detected that the SOC of the storage battery 10 has reached the charge target amount or more (S518: YES), the control device 100 stops the power supply from the power generation facility 51 to the storage battery 10 (S519).

  Thereafter, the control device 100 determines whether or not the voltage of the low-voltage line 3 is less than the preset lower limit value of the aptitude range, and if the voltage of the low-voltage line 3 is not less than the lower limit value of the aptitude range. The process waits until the voltage of the low-voltage line 3 becomes less than the lower limit value of the appropriate range (S520). If the voltage of the low voltage line 3 is not less than the lower limit value of the suitability range, the process returns to S511 instead of waiting until the voltage of the low voltage line 3 is less than the lower limit value of the suitability range. It may be.

  When the control device 100 detects that the voltage of the low voltage line 3 is less than the lower limit value of the appropriate range (S520: YES), the changeover switch 20 so that the generated power of the power generation facility 51 is supplied to the low voltage line 3. Is controlled (S521). Thereafter, the process returns to S511.

  Thus, when the voltage of the low voltage line 3 becomes less than the lower limit value of the appropriate range (S520), the control device 100 controls the changeover switch 20 so that the generated power of the power generation facility 51 is supplied to the low voltage line 3. Therefore, it is possible to suppress a decrease in the voltage of the low-voltage line 3 using the power generated by the power generation facility 51.

  In S531, the control device 100 determines whether or not the voltage of the low voltage line 3 currently exceeds the upper limit value (107V) of the specified range. If the voltage of the low-voltage line 3 currently exceeds the upper limit value of the specified range (S531: NO), the process returns to S511. On the other hand, when the voltage of the low-voltage line 3 is currently not more than the upper limit value of the specified range (S531: YES), the process proceeds to S532.

  In S532, the control device 100 determines whether or not the storage battery 10 is in a chargeable state (whether it is in a fully charged state (SOC = 100%)) based on the value input from the above-described storage amount monitoring sensor. When charging is not possible.) When the storage battery 10 is not chargeable (S532: NO), a process returns to S511. When the storage battery 10 can be charged (S532: YES), the process proceeds to S533.

  In S533, the control device 100 controls the changeover switch 20 so that the power generated by the power generation facility 51 is supplied to the storage battery 10, and starts charging the storage battery 10 (S534).

  In this way, even when the storage amount of the storage battery 10 is equal to or greater than the target charge amount, the control device 100, if the voltage of the low-voltage line 3 exceeds the upper limit value of the specified range, Since the power generated by the power generation facility 51 is supplied to the storage battery 10 to charge the storage battery 10, an increase in the voltage of the low-voltage line 3 can be suppressed. In addition, the power generated by the power generation facility 51 can be effectively sold (the power supplied from the power generation facility 51 to the storage battery 10 is measured by the power sales power meter 55 as the amount of power sold). . For this reason, in the consumer 5, the introduction effect and the willingness to introduce the power generation facility 51 can be enhanced, and the introduction of the green power facility can be promoted.

  While the storage battery 10 is being charged, the control device 100 monitors whether or not the storage battery 10 is fully charged (S535), and when detecting that the storage battery 10 is fully charged (S535: NO), the power generation facility 51 transfers to the storage battery 10. Is stopped (S519). Thereafter, the process proceeds to S520, and thereafter, the same process as described above is performed.

  FIG. 7 is a flowchart illustrating another process of the control device 100 (hereinafter referred to as a discharge process S700). The control device 100 repeatedly executes this discharge process S700.

  As shown in the figure, the control device 100 first determines whether or not the integrated control by the integrated control processing unit 411 is currently being executed (S711). If integrated control is currently being executed (S711: YES), the process returns to S711. If integrated control is not being executed (S711: NO), the process proceeds to S712.

  In S712, the control device 100 determines whether or not the storage battery 10 is currently being charged. The control device 100 makes this determination based on the contact state of the changeover switch 20, the operation state of the converter 41, the input current of the storage battery 10, the operation state of the PCS 52, and the like. If the storage battery 10 is currently being charged (S712: YES), the process returns to S711. On the other hand, if the storage battery 10 is not currently being charged (S712: NO), the process proceeds to S713.

  In S713, the control device 100 determines whether or not the SOC of the storage battery 10 is currently equal to or greater than the charge target amount based on the value input from the above-described storage amount monitoring sensor. If the SOC of the storage battery 10 is currently equal to or greater than the charge target amount (S713: YES), the process proceeds to S714. On the other hand, when the SOC of the storage battery 10 is less than the target charge amount (S713: NO), the process proceeds to S731.

  In S <b> 714, the control device 100 determines whether or not the voltage of the low-voltage line 3 is less than the lower limit value of the preset appropriate range based on the value input from the low-voltage line voltage sensor described above. When the voltage of the low voltage line 3 is equal to or higher than the lower limit value of the appropriate range, the process waits until the voltage of the low voltage line 3 becomes less than the lower limit value of the appropriate range (S714: NO). If the voltage of the low voltage line 3 is not less than the lower limit value of the suitability range, the process returns to S711 instead of waiting until the voltage of the low voltage line 3 is less than the lower limit value of the suitability range. Good.

  If it is determined in S714 that the voltage of the low voltage line 3 is less than the lower limit value of the appropriate range (S714: YES), the control device 100 controls the on / off switch 30 so that power is supplied from the storage battery 10 to the low voltage line 3. (S715) and discharging of the storage battery 10 is started (S716).

  Thus, the control apparatus 100 is more than the preset charge target amount in the storage battery 10 (S713: YES), and the voltage of the low voltage line 3 is less than the lower limit value of the preset aptitude range. In some cases (S714: YES), since the electric power stored in the storage battery 10 is supplied to the low voltage line 3, it is possible to suppress the voltage drop of the low voltage line 3 using the electric power stored in the storage battery 10. . Further, the power stored in the storage battery 10 is transferred between the consumers 5 receiving the power supply from the same transformer 4, and the supply-demand balance is adjusted between the consumers 5 connected to the same transformer 4. it can.

  After starting the discharge of the storage battery 10, the control device 100 monitors in real time whether or not the SOC of the storage battery 10 has become less than the target charge amount (S717). When it is detected that the SOC of the storage battery 10 has become less than the target charge amount (S717: YES), it is then determined whether the voltage of the low voltage line 3 exceeds the preset upper limit value of the aptitude range. When the voltage of the line 3 exceeds the upper limit value of the suitability range, the process waits until the voltage of the low voltage line 3 exceeds the upper limit value of the suitability range (S718). If the voltage of the low voltage line 3 does not exceed the upper limit value of the aptitude range, the process returns to S711 instead of waiting until the voltage of the low voltage line 3 exceeds the upper limit value of the aptitude range. May be.

  When the control device 100 detects that the voltage of the low voltage line 3 exceeds the upper limit value of the appropriate range (S718: YES), the control device 100 controls the on / off switch 30 so that power is not supplied from the storage battery 10 to the low voltage line 3 ( S719), the discharge of the storage battery 10 is terminated (S720). Thereafter, the process returns to S711.

  Thus, when electric power is being supplied from the storage battery 10 to the low voltage line 3, the storage amount of the storage battery 10 becomes less than the target charge amount (S717: YES), and the voltage of the low voltage line 3 is the upper limit value of the appropriate range. Exceeds the limit, the control device 100 controls the on / off switch 30 so that power is not supplied from the storage battery 10 to the low-voltage line 3, so that the storage amount of the storage battery 10 can be maintained at an appropriate level, and the low-voltage line 3 Can be prevented from deviating from the appropriate range.

  In S731, the control device 100 determines whether or not there is a problem in the power supply of the low-voltage line 3 based on the value (information) currently input from the low-voltage line state monitoring sensor (for example, the low-voltage line 3). It is determined whether the voltage deviates from the specified range, the supply reliability (for example, a value represented by the presence or absence of a power failure, the presence or absence of an instantaneous power failure, the presence or absence of flicker) is lower than a preset threshold value). To do. If there is no hindrance in the power supply of the low voltage line 3 (S731: NO), the process returns to S711. On the other hand, when the power supply of the low voltage line 3 is currently hindered (S731: YES), the process proceeds to S732.

  In S732, the control device 100 controls the on / off switch 30 so that power is supplied from the storage battery 10 to the low voltage line 3 (S732), and starts discharging the power of the storage battery 10 to the low voltage line 3 (S733). Thereafter, the control device 100 monitors in real time whether or not the trouble that has occurred in the low-voltage line 3 has been resolved (S734). When the control device 100 detects that the trouble that has occurred in the low-voltage line 3 has been resolved (S734: NO), the process proceeds to S719 (hereinafter, the same process as described above).

  As described above, the control device 100 is stored in the storage battery 10 if the power supply of the low voltage line 3 is hindered even when the storage amount of the storage battery 10 is less than the preset charge target amount. Since the supplied electric power is supplied to the low-voltage line 3, it is possible to quickly cope with troubles occurring in the low-voltage line 3.

  As described above, according to the power distribution system 1 of the present embodiment, the control device 100 is at least one of the storage amount of the storage battery 10, the voltage of the low voltage line 3, and the supply state of power by the low voltage line 3. Accordingly, the changeover switch 20 and the on / off switch 30 are controlled to adjust at least one of the storage amount of the storage battery 10, the voltage of the low voltage line 3, and the power supply state of the low voltage line 3. The power generated by the power generation facility 51 can be used effectively. In addition, since the generated power of the power generation facility 51 is stored in the storage battery 10, the generated power can be used as the amount of power sold without waste. Therefore, it is not necessary to force the customer 5 to suppress the amount of power sold, and the power generation facility in the customer 5 51 does not impair the introduction effect and willingness to introduce. Moreover, the voltage of the low voltage line 3 can be adjusted using the electric power stored in the storage battery 10, and the stable supply of electric power can be aimed at. Moreover, since the storage battery 10 is interposed as a buffer between the high voltage line 2 and the power generation equipment 51, fluctuations in power flow on the high voltage line 2 side are also suppressed.

  The embodiment described above is for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.

  1 Power Distribution System, 2 High Voltage Line, 3 Low Voltage Line, 4 Transformer, 5 Customer, 6 Storage Battery Discharge Power Supply Line, 10 Storage Battery, 20 Changeover Switch, 30 On-Off Switch, 41 Converter, 42 Inverter, 51 Power Generation Equipment, 52 PCS , 54 Electricity purchased electricity meter, 55 Electricity sold electricity meter, 61 Wiring for electric power purchase, 71 Wiring for electric power sale, 44 1st unidirectional element, 45 2nd unidirectional element, 100 Control apparatus, 103 Communication apparatus 104 control circuit, 411 integrated control processing unit, 412 storage battery charge processing unit, 413 storage battery discharge processing unit

Claims (10)

A transformer that transforms the power supplied from the high-voltage line and supplies it to the low-voltage line;
A plurality of consumers who receive power supply through the low-voltage line;
Power generation equipment provided to the consumer;
A storage battery provided corresponding to the transformer;
A supply line for the generated power, provided with a changeover switch for selecting either the storage battery or the low-voltage line to supply the generated power of the power generation facility;
A supply line for discharge power of the storage battery, provided with an on / off switch for controlling whether or not the power stored in the stored electricity value is supplied to the low-voltage line;
A sensor that detects at least one of a storage amount of the storage battery, a voltage of the low-voltage line, and a power supply state of the low-voltage line;
In a power distribution system configured to include a control device that controls at least one of the changeover switch and the on / off switch,
The control device controls at least one of the changeover switch and the on / off switch in accordance with a detection value of the sensor, whereby the storage amount of the storage battery, the voltage of the low voltage line, and the voltage of the low voltage line A method of controlling a power distribution system that controls at least one of power supply states. A control method for a power distribution system according to claim 1,
When the storage amount of the storage battery is less than a preset charge target amount and the voltage of the low voltage line exceeds the upper limit value of the preset aptitude range, the control device A control method for a power distribution system, wherein the changeover switch is controlled so that generated power is supplied to the storage battery. A control method for a power distribution system according to claim 1 or 2,
The control device is configured such that a storage amount of the storage battery is equal to or greater than a preset charge target amount, the voltage of the low-voltage line exceeds an upper limit value of a specified voltage in electrical equipment technical standards, and the storage battery A control method of a power distribution system that controls the changeover switch so that the generated power of the power generation facility is supplied to the storage battery when the battery is not fully charged. A control method for a power distribution system according to any one of claims 1 to 3,
The control device controls the changeover switch so that the generated power of the power generation facility is supplied to the low-voltage line when the voltage of the low-voltage line becomes less than a lower limit value of a preset aptitude range. Method. A control method for a power distribution system according to any one of claims 1 to 4,
When the storage amount of the storage battery is equal to or higher than a preset charge target amount and the voltage of the low-voltage line is less than a lower limit value of a preset aptitude range, the control device removes the low-voltage from the storage battery. A control method for a power distribution system, wherein the on / off switch is controlled so that power is supplied to the line. A control method for a power distribution system according to any one of claims 1 to 5,
The control device supplies power from the storage battery to the low-voltage line when the storage amount of the storage battery is less than a preset charge target amount and the supply of power to the low-voltage line is hindered. A control method for a power distribution system, wherein the on / off switch is controlled. It is the control method of the power distribution system as described in any one of Claims 1 thru | or 6, Comprising:
When the electric power is supplied from the storage battery to the low-voltage line, the control device has a storage capacity of the storage battery that is less than a preset charge target amount, and the voltage range of the low-voltage line is preset. A control method for a power distribution system that controls the on / off switch so that power is not supplied from the storage battery to the low-voltage line when an upper limit value of the storage battery is exceeded. A control method for a power distribution system according to any one of claims 1 to 7,
The power distribution system includes a first unidirectional element that is provided in the generated power supply line and passes current only in a direction from the generated power supply line toward the input side of the stored value, and the storage battery output supply line. A control method for a power distribution system, comprising: at least one of a second unidirectional element that is provided on the second battery and passes current only in a direction from the output side of the storage battery toward the low-voltage line. A control method for a power distribution system according to any one of claims 1 to 8,
The power distribution system converts AC power output from the power generation equipment into DC power and supplies the battery, and converts DC power output from the storage battery into AC power and supplies the low voltage line A method for controlling a power distribution system comprising an inverter.   An information processing device functioning as the control device in the control method of the power distribution system according to any one of claims 1 to 9, wherein the change-over switch and the on / off switch according to a detection value of the sensor An information processing apparatus having a function of controlling at least one of a storage amount of the storage battery, a voltage of the low-voltage line, and a power supply state of the low-voltage line by controlling at least one of the above.

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