JP6944388B2 - Power coordination control system at multiple stations - Google Patents

Description

The present invention relates to a power coordinated control system equipped with electrical equipment such as an air conditioner and a lighting device, and more particularly to a technology that can be utilized for demand coordinated control that controls power supply according to power demand at a plurality of stations. be.

Conventional power receiving and distribution equipment that supplies the necessary power to the station building of a railway company generally uses AC power supplied from a substation or an electric power company.
On the other hand, in railways, in a DC feeder system, the regenerative power generated by the regenerative brake of an electric vehicle is used as the power running power of another electric vehicle via a feeder. Therefore, an inverter that converts the direct current of the DC power supply system to alternating current is provided, and when regenerative power exceeding a predetermined value is generated, the inverter is operated so that the power converted by the inverter can be supplied to the power supply system of the station building. As a result, an invention relating to a station building power supply device that enables effective utilization of surplus regenerated electric power of an electric vehicle has been proposed (for example, Patent Document 1).

Further, a power storage unit for storing the surplus regenerated power in the substation section and a power conversion unit for converting the DC power supplied from the power storage unit into the AC power supplied to the station equipment are provided, and the surplus regenerated power is temporarily stored in the power storage unit. An invention relating to a station building power supply device that accumulates and controls a power conversion unit to supply power from the power storage unit to station equipment when the charge amount of the power storage unit exceeds a predetermined threshold has also been proposed (for example). , Patent Document 2).

Japanese Unexamined Patent Publication No. 2015-107766 Japanese Unexamined Patent Publication No. 2014-40127 Japanese Unexamined Patent Publication No. 2017-153191

By the way, in recent years, the power consumed by each station building has tended to increase with the expansion of station equipment, stores in the station premises, snow melting equipment, etc., and the power supply system to the existing station building must meet the required power. Can be difficult. In addition, the distribution line used to supply power to the station building is often laid along the railway line from the distribution transformer installed in the DC substation that supplies power for train operation, and is generally used by electric power companies. Since it is linear unlike a planar distribution line, if the power supplied increases, the voltage of the distribution line may drop, causing malfunction of the load (station electrical equipment).

In order to solve such a problem, it is conceivable to take measures to suppress a decrease in voltage by using the station building power supply device according to the inventions of Patent Document 1 and Patent Document 2, but the station building power supply device of Patent Document 1 and Patent Document 2 is considered. Was developed for the effective utilization of surplus regenerated electric power of electric vehicles, and it is difficult to stably supply the required electric power to station facilities for a long period of time. Therefore, if the power consumption exceeds the permissible value, it is necessary to strengthen the infrastructure such as distribution lines.
In addition, it is possible to reduce the electrical resistance by increasing the diameter of the distribution line and to install an SVR (automatic voltage regulator), but all of these measures are significant costs due to the high hardware price and installation cost. There is a problem of inviting up. Moreover, although these measures satisfy the requirement of suppressing the voltage drop, the peak cut of the demand power cannot be expected, which does not lead to the reduction of the infrastructure equipment.

Furthermore, in the power supply system of a station building, since the equipment of multiple station buildings that are separated from each other is connected to one linear distribution line, the entire system is monitored and some equipment is connected. It is necessary to control to reduce the power supply.
Therefore, the applicant has a plurality of power interchange devices capable of converting the DC power supplied from the substation on the terminal side of the distribution line to the AC power and supplying it to the terminal side of the distribution line among the two substations. Terminal AC voltage detection means that detects the voltage value on the side of the station building on the side far from the substation on the start side of the distribution line, and the power interchange device when it is determined that the detected terminal AC voltage is less than or equal to the predetermined voltage value. Coordination with a function to temporarily operate the device and a function to reduce the AC power supplied to any of the electrical equipment of multiple station buildings by referring to the table data showing the controlled device and the degree of power supply in stages. An application has been filed for an invention relating to a power control system provided with a control device (Patent Document 3).

However, the system described in Patent Document 3 uses the power supply device in the section where the power supply device (inverter) having a function of converting the surplus regenerated power into AC power and supplying it to the station building is already installed. Since it can be used as a power supply interchange device that supplies power to the terminal side of the distribution line, it is possible to suppress the increase in hardware, but if you want to apply it to a section where such a power supply device is not installed, it is hard. There is a problem that the number of wear is increased.
The present invention has been made in the background as described above, and provides a power cooperative control system capable of cutting the peak demand power without causing an increase in hardware and avoiding a voltage drop in a distribution line. The purpose is to do that.

In order to achieve the above object, the present invention
A distribution line that receives AC power from a substation and supplies power to multiple station buildings,
A plurality of local demand control devices provided in each of the plurality of station buildings and capable of outputting instructions for reducing power demand to the electrical equipment of the corresponding station building.
A cooperative control device that acquires information on a received power value and a control state from the plurality of local demand control devices and sends a control command value related to the demand power to each of the plurality of local demand control devices. In a power coordination control system at a plurality of stations that regulates AC power supplied from the distribution line to each of the electrical equipment of the plurality of station buildings.
The local demand control device is
A power measuring means that measures the received power of each station building,
A storage device that stores an energy-saving control table that shows the relationship between multiple power-saving control stages and the amount of power saved in the electrical equipment of the station building.
When the received power exceeds a preset value based on the power value measured by the power measuring means, the power saving control stage is determined and the energy saving control table is referred to based on the determined power saving control stage. It has a function to output an instruction to reduce the power demand to the electric equipment of its own station building and a function to output an instruction to reduce the power demand to the electric equipment of its own station building in response to a control command from the cooperative control device. Equipped with power suppression means,
When the total value of the received power values acquired from the plurality of local demand control devices exceeds a preset value, the coordinated control device sets the power saving control stage of coordinated control based on the acquired control state information. Calculate the total power saving control stage by adding the power saving control stage of each station building, extract the station building with the lowest total power saving control stage, and send a control command to raise the power saving control stage to the corresponding local demand control device. It is configured in.

According to the above means, when the power demand increases in any of the station buildings connected to the distribution line, the surplus regenerated power is used to reduce the power supplied to any of the electric facilities in the multiple station buildings. It is possible to suppress the peak of power demand and avoid a voltage drop in the distribution line without providing a power supply device (inverter) having a function of converting the power into AC power and supplying it to each station building. In addition, the total power saving control stage is calculated by adding the power saving control stage of cooperative control and the power saving control stage of each station building, the station building with the lowest total power saving control stage is extracted, and a control command for raising the power saving control stage is sent. Therefore, when the power demand is tight, the power saving control for reducing the power consumption of the equipment is equally executed at each station, and it is possible to avoid the occurrence of a station building where the power saving control is extremely forced.

Here, preferably, the energy-saving control table describes information on the power saving rate of the electric equipment arranged in each of a plurality of preset areas of the electric equipment of the corresponding station building. ,
The local demand control device determines the power demand of the electrical equipment of its own station building based on the power saving control stage determined by determining its own power saving control stage or the power saving control stage designated by the control command from the cooperative control device. At that time, the power saving amount of the electric equipment in each area is determined with reference to the energy saving control table, and the power saving instruction is output to the electric equipment.
According to this configuration, the power saving amount of the electric equipment in each area is determined by referring to the energy saving control table, and the power saving instruction is output to the electric equipment, so that a complicated algorithm or calculation formula is used. It is possible to determine the amount of power saving without doing so and output a power saving instruction to the corresponding electrical equipment.

Further, preferably, the electrical equipment includes at least lighting equipment and air conditioning equipment.
In the energy saving control table, different power saving rates for the lighting equipment and the air conditioning equipment are described for each power saving control stage.
According to such a configuration, it is possible to suppress a decrease in service to users without forcing each station building to save power when the demand for electric power temporarily increases.

Further, preferably, a secondary battery and a power storage device provided with charge / discharge control means for the secondary battery are connected to the distribution line.
The cooperative control device sends a command to start discharging to the charge / discharge control means when the total value of the received power values acquired from the plurality of local demand control devices exceeds a preset value. Configure to do.
According to such a configuration, since the power storage device is provided, it is possible to preferentially set the equipment for reducing power among the lighting equipment and the air conditioning equipment for each station building, so that the power can be saved according to the configuration of the power supply system to be applied. It is possible to avoid a voltage drop in the distribution line while executing appropriate power saving control according to the circumstances of each station building.

Further, preferably, the charge / discharge control means has a function of transmitting at least information indicating a charge / discharge state and a charge amount to the cooperative control device.
The cooperative control device is conditioned on the charge amount of the power storage device being equal to or more than a predetermined value when the total value of the received power values acquired from the plurality of local demand control devices exceeds a preset value. It is configured to generate a command to start discharging and send it to the charge / discharge control means.
According to this configuration, since a command to start discharging is sent on condition that the charge amount of the power storage device is equal to or higher than a predetermined value, the distribution line is used when the power demand increases while avoiding the deterioration of the battery due to over-discharging. It is possible to avoid the voltage drop of.

According to the present invention, there is an effect that it is possible to realize a power cooperative control system capable of cutting the peak demand power without inviting an increase in hardware and avoiding a voltage drop in the distribution line.

It is a system block diagram which shows one Embodiment of the station building electric power supply system to which the electric power cooperative control system which concerns on this invention is applied. It is a figure which shows an example of the energy saving control table used by the station demand control device in the electric power coordinated control system which concerns on embodiment. (A) is a control table showing the concept of power saving control in the cooperative control device constituting the power cooperative control system according to the embodiment, (B) is a time chart showing an example of the process of power saving control, and (C) is a state change. It is a figure which shows the timetable which shows in time series. It is a flowchart which shows an example of the procedure of self-sustaining power saving control in the station demand control device which comprises the power cooperative control system which concerns on embodiment. It is a flowchart which shows an example of the procedure of the cooperative control in the cooperative control device which comprises the electric power cooperative control system which concerns on embodiment. It is a flowchart which shows the other procedure (modification example) of the cooperative control in a cooperative control device.

Hereinafter, embodiments of the power cooperative control system according to the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram showing an embodiment of a station building power supply system to which the power cooperative control system according to the present invention is applied.
Although the distribution lines of the two substation sections are taken out and shown in FIG. 1, the other substation sections are also configured in the same manner as in FIG.

As shown in FIG. 1, in one substation section, a pair of distribution lines that supply AC power (for example, AC6600V system) to station buildings (station equipment) 10A, 10B ... 10C of a plurality of stations in the substation section. 20 is provided. AC power is supplied to the distribution line 20 from one of the substations 30A and 30B (for example, the substation 30A) located at both ends of the substation section. Of the pair of distribution lines 20, one is a regular distribution line and the other is a spare distribution line. Here, when the end of the distribution line 20 on the substation 30A side is called the start end, a circuit breaker 41 is provided on the start end side of the distribution line 20 and a circuit breaker 42 is provided on the end side. The circuit breaker of the regular distribution line of the circuit breaker 41 on the start end side is conducted, and the circuit breaker of the regular and spare distribution lines of the circuit breaker 42 on the terminal side is cut off.

On the other hand, when the circuit breaker 42 of the regular distribution line on the terminal side of the distribution line 20 is put into a conductive state, the regular and spare circuit breakers of the circuit breaker 41 on the starting end side of the distribution line 20 are put into a cutoff state. .. Since the AC power sent from the two substations may be out of phase, if AC power is supplied to one distribution line 20 from the substations at both ends at the same time, a touching accident may occur, so avoid this. Therefore, when one of the circuit breakers at both ends of the distribution line 20 is brought into a conductive state, the circuit breaker at the other end is always put into a cutoff state.

Although not particularly limited, in the power coordination control system of the present embodiment, the power storage device 50 is connected to the terminal side of the distribution line 20 via the circuit breaker 43.
The power storage device 50 includes a battery 51 made of a secondary battery such as a lead storage battery, a transformer 52, and a PCS (power conditioning system) 53 that converts a direct current into an alternating current or an alternating current into a direct current. A charge / discharge control device 54 that controls the PCS 53 in response to a charge / discharge command from the central control device 60 is provided. Further, the circuit breaker 43 has a function of monitoring the voltages of the regular and spare distribution lines to prevent accidental discharge during a maintenance power failure.

Although not shown in FIG. 1, the station buildings 10A, 10B ... 10C are provided with station demand control devices 11A, 11B ... 11C as local demand control devices, respectively, and are supplied from the distribution line 20. A transformer that converts high-voltage AC power (AC6600V system) to low-voltage AC power (for example, AC210V system) is installed in the station electric room, etc. Power is supplied by.
Further, each station building 10 is provided with a wattmeter or ammeter for measuring the power or current consumed in the own station building, and the measured power value or current value is input to the station demand control device 11. Each station demand control device 11 is configured to compare the maximum permissible power value and the power consumption value of the own station building and perform stepwise energy saving control when the maximum permissible power value is approached.

In the power supply system of the present embodiment, the central cooperative control device 60 is connected to the station demand control devices 11A, 11B ... 11C and the charge / discharge control device 54 of the power storage device 50 via a communication line and controls them in an integrated manner. The station demand control device 11A, 11B ... 11C transmits a value indicating the amount of power received and the control stage being executed to the central cooperative control device 60, and the central cooperative control device 60 sends the station demand control device 60. Control values are transmitted to 11A, 11B ... 11C.

Further, the discharge amount (discharge rate) is transmitted from the charge / discharge control device 54 of the power storage device 50 to the central coordinated control device 60, and the central coordinated control device 60 charges / discharge controls the charge / discharge control device 54 according to the discharge amount. It is configured to send commands.
A voltmeter for detecting the voltage at the power input point (node Na in FIG. 1) of the station building 10A, which is the terminal end of the distribution line 20, is provided, and the detection signal from the voltmeter is transmitted to the central cooperative control device 60. In consideration of the detected voltage, a discharge control command may be transmitted to the charge / discharge control device 54, or a control value may be generated and transmitted to the station demand control devices 11A, 11B ... 11C.

Here, the central coordinated control device 60 is a device having the same configuration as a general control device, for example, a microprocessor and a storage device (memory) for storing fixed data such as a microprocessor and a reference table executed by the microprocessor. , A computer device equipped with an input operation device capable of inputting commands to the microprocessor and an output device such as a liquid crystal display panel and a lamp can be used, and detailed description thereof will be omitted. Data transmission / reception between the central cooperative control device 60 and the station demand control devices 11A, 11B ... 11 or the charge / discharge control device 54 may be performed by using a cable.

The concept of cooperative control in this embodiment is that while the total power consumption of all stations is sufficiently lower than the maximum allowable power value, each station demand control device 11 sets the maximum allowable power value and the power consumption value of its own station building. When the total power consumption of all stations reaches a predetermined ratio (for example, 95%) of the maximum allowable power value, the central cooperative control device 60 saves energy in each station building. With reference to the control level, the control level for suppressing the power consumption of the station demand control device 11 of each station building is determined, the control value is generated, and the control value is transmitted to the corresponding station demand control device 11 to perform the station demand. Energy saving control is performed at a control level according to the control value received by the control device 11.

The station demand control device 11 of each station building holds in memory energy-saving control table data in which the power suppression rate is set for each target area and target equipment according to the control level, and the station demand control device 11 When the control value is received from the central coordinated control device 60, the equipment to be controlled and the target power value are determined with reference to the energy saving control table based on the received control value, and the power control is executed.
Hereinafter, an example of a specific control method by the station demand control device 11 and the central cooperative control device 60 when the above concept is applied will be described with reference to FIGS. 2 and 3.

The station demand control device 11 of each station building has an energy-saving control table as shown in FIG. 2, and executes independent control according to the energy-saving control table of FIG. In FIG. 2, the “backyard” means the electrical equipment in the area where station employees are active, and the “concourse” means the electrical equipment in the area where passengers come and go.
The contents of the energy-saving control table held by the station demand control device 11 of each station building are set differently according to the number of equipment and devices arranged in the own station building and the maximum allowable power. In the energy saving control table of FIG. 2, "control level 0" means that the energy saving control is not performed. Further, "* 1" in the "home" column means that the control is performed by a timer, a detection signal of the illuminance sensor, or the like, and is not under the control of the station demand control device 11. In the case of an underground station, the station platform may also be controlled according to a "concourse" or the like.

The values shown in the energy saving control table are examples, and are not limited to such values. Further, in the table of FIG. 2, the energy saving rate is set to increase in the order of backyard-concourse-window, but the order may be changed according to the structure of the station or the like.
Further, in the table of FIG. 2, in the "concourse", the air conditioner is given priority over the power consumption of the lighting device to reduce the power, but the lighting device is given priority over the air conditioner to reduce the power. It may be controlled as follows. “Other” equipment includes escalators and elevators, and for these equipment, the number of operating units may be gradually reduced when power suppression control is performed. In that case, for example, if one of the four units is stopped, the power consumption will be 75% (25% reduction in power consumption).

As shown in FIG. 3A, the control by the central cooperative control device 60 in the present embodiment using the table of FIG. 2 is performed by the central cooperative control device 60 in the stepwise independent control (vertical direction) for each station building. It is executed by adding stepwise control (horizontal axis direction) based on the control command from.
Although FIG. 3A shows that the independent control and the cooperative control each have three stages, the number of control stages is not limited to “3”. Further, the number of stages of the independent control and the number of stages of the central cooperative control may be different.

Here, as an example, FIG. 3 (C) shows how the cooperative control proceeds when the demand power of the entire system (total demand power of the three stations) increases with time as shown in FIG. 3 (B). ) Will be described.
In FIG. 3B, the horizontal axis is time, the vertical axis is the total power demand (rate), THp is the power threshold value that is a condition for the central cooperative control device 60 to issue a control command, and for example, THp is the system. It means a value such as 95% (or 90%) of the total maximum allowable power. Further, in FIG. 3C, (0,0), (3,0), (0,1) and the like represent the number of control stages for independent control and the number of control stages for cooperative control, respectively, and the right side of the equal symbol (=). Represents the sum of the values in parentheses.

In the column of the initial state (t1) of the "state event" in FIG. 3 (C), at the time t1 in the graph of FIG. The number of stages is "0", and at station B, the third stage power suppression control (number of independent control stages = "3") is performed by independent control, while the power suppression control is not performed by cooperative control (number of control stages = "". 0 "), and the C station does not perform self-sustaining control (number of control stages =" 0 "), while the first-stage power suppression control (number of self-sustaining control stages =" 1 ") is performed by coordinated control. Represents.

From this state, when the total power demand exceeds the power threshold THp as shown at time t2 in FIG. 3 (B), the “state event” in FIG. 3 (C) becomes “THp” as shown in the second line. "Pass", and a coordinated control command (target power saving rate, etc.) is issued from the central coordinated control device 60. At this time, since the B station and the C station have already performed the power suppression control in the initial state (t1) and the A station has the lowest total number of combinations, the central cooperative control device 60 is used as the station demand control device 11A of the A station. On the other hand, a cooperative control command is issued to raise the power suppression control by one step.
As a result, the control state (number of control stages) of station A becomes (0,1) = 1. Then, if the power saving control at the station A that receives the cooperative control command causes the power demand rate to drop once as shown at time t3 in FIG. 3 (B), for example, if the self-sustaining power saving control at the station A is executed, the figure shows. The "state event" of 3 (C) is "A station control stage number +1" as in the third line, and the control state (control stage number) of A station is (1,1) = 2. As a result, the total power demand rate becomes lower than the power threshold THp (time t4).

After that, when the total power demand increases again and exceeds the power threshold THp as shown at time t5 in FIG. 3 (B), the “state event” in FIG. 3 (C) becomes as shown in the fourth line. It becomes "THp passage", and a cooperative control command is issued from the central cooperative control device 60. At this time, since the total number of combined stages is "2" for station A, "3" for station B, and "1" for station C, a coordinated control command is issued to station C, which has the lowest number of combined stages. The control state (number of control stages) of station C is (0,2) = 2.

As a result, the total demand power temporarily falls below the power threshold THp but increases again as shown at time t6 in FIG. 3 (B), and the total demand power becomes power as shown at time t7 in FIG. 3 (B). Assuming that the threshold value THp is exceeded, the “state event” in FIG. 3C becomes “THp passage” as shown in the fifth line, and the central cooperative control device 60 issues a cooperative control command. At this time, since the number of combined stages is "2" for station A, "3" for station B, and "2" for station C, a cooperative control command is issued to station C, which has a low number of combined stages, and the number of combined stages is "2". The control state (number of control stages) is (0,3) = 3. At this time, the central coordinated control device 60 may issue a coordinated control command to station A, which has the same number of combined stages as station C. As a result, the control state (number of control stages) of station A becomes (1, 2) = 3.

Next, the flowcharts of FIGS. 4 and 5 show an example of a specific power reduction control procedure by the station demand control device 11 and the cooperative control device 60 of each station building when the above control is applied to the power supply system of FIG. Will be described using.
Since the power supply system of FIG. 1 includes a power storage device 50, it is necessary to include a process of issuing a control command from the cooperative control device 60 to the power storage device 50. Further, as a method of issuing a command for cooperative control to the power storage device 50, there are an idea of giving priority to electric power demand and an idea of giving priority to energy saving. First, regarding the control procedure when the idea of giving priority to electric power demand is adopted. explain.

Of FIGS. 4 and 5, FIG. 4 shows the control procedure of the station demand control device 11, and FIG. 5 shows the control procedure of the cooperative control device 60.
When the control process of FIG. 4 is started, the station demand control device 11 first reads the received power value W of the own station equipment from the wattmeter of the own station (step S1), and sets the preset power of the own station. It is determined whether or not the received power value W is larger than the threshold power THa (step S2). The threshold power THa may be, for example, 95% of the maximum demand power value, but may be 90% or the like. The "maximum demand power value" is the sum of the maximum power supply from the substation and the discharge power of the power storage device when the power storage device 50 is discharging.

If it is determined in step S2 that the received power value W is not larger than the threshold power THa (No), the process proceeds to step S6. Further, if it is determined that the received power value W is larger than the threshold power THa (step S2: Yes), the process proceeds to step S3.
In step S3, the current number of independent control stages of the own station (see FIG. 3 (A)) is increased by one step, and the equipment to be power-saving is selected according to the new number of independent control stages by referring to the table shown in FIG. Then, a power saving command is issued to the target device (step S4). After that, it waits for the predetermined time T1 corresponding to the response time when the power value changes due to the power saving command elapses (step S5), returns to step S1 when the predetermined time T1 elapses, and reads the received power value W from the wattmeter again. ..

Then, if it is determined in the next step S2 that the received power value W is larger than the threshold power THa of the own station (Yes), the above steps S3 to S5 are repeated, while the received power value W is the threshold power in step S2. If it is determined that the value is not larger than THa (No), the process proceeds to step S6, and it is determined whether or not the received power value W is smaller than (THa−Δp). It is conceivable that Δp is, for example, 5% and (THa−Δp) is 90%.

If it is determined in step S6 that the received power value W is not smaller than (THa−Δp) (No), the process returns to step S1, and if it is determined that the received power value W is smaller than (THa−Δp) (Yes). Proceed to step S7, reduce the number of independent control stages of the current own station by one step, refer to the energy-saving control table shown in FIG. 2, and select and target the equipment that permits the increase in power according to the new number of independent control stages. Issue a command to the equipment (implementation of peak power cut). After that, it waits for the predetermined time T1 corresponding to the response time when the power value changes due to the power saving command elapses (step S8), and when the predetermined time T1 elapses, the process returns to step S1 and the above procedure is repeated.

When the control by the cooperative control device 60 of FIG. 5 is started, the cooperative control device 60 first acquires the received power value W and the number of power saving control stages of each station from the station demand control devices 11 of stations A to C (step S11). ). Further, the cooperative control device 60 acquires the battery charge amount and the state information indicating whether the battery is being charged or discharged from the control device 54 of the power storage device 50 (step S12).
Next, the cooperative control device 60 calculates the total received power value, that is, the total TW of the received power values of stations A to C (step S13). Subsequently, it is determined whether or not the total power value TW of the demand power is larger than the preset threshold power THp (step S14).

If it is determined in step S14 that the total power value TW is not larger than the threshold power THp (No), the process proceeds to step S15. Further, if it is determined that the total power value TW is larger than the threshold power THp (step S14: Yes), the process proceeds to step S18.
In step S15, it is determined whether or not the battery charge amount of the power storage device 50 is larger than the preset threshold value THc. Then, if it is determined that the threshold value is not greater than THc (No), the process proceeds to step S18. Further, if it is determined in step S15 that the charge amount is larger than the threshold value THc (Yes), the process proceeds to step S16, and a predetermined time T2 elapses after issuing a discharge start command to the control device 54 of the power storage device 50. (Step S17), and the process returns to step S11.

In step S18, when it is determined in step S14 that the total power value TW is not greater than the threshold power THp (No) or in step S15 it is determined that the charge amount is not greater than the threshold value THc (No), the transition is made. Find the station with the smallest total number of control stages. In addition, a charging start command is issued to the control device 54 of the power storage device 50. Subsequently, a control command for increasing the number of control stages by one is transmitted to the station demand control device 11 of the station (step S19). After that, it waits for the predetermined time T3 to elapse (step S20), proceeds to step S21, and determines whether or not the total power value TW is smaller than (THp−Δp).

Further, if it is determined in step S21 that the total power value TW is not smaller than (THp−Δp) (No), the process returns to step S11, and the total electric power value TW is smaller than (THp−Δp) (Yes). If it is determined, the process proceeds to step S22, and the station having the largest total number of control stages is obtained. Subsequently, a control command for reducing the number of control stages by one is transmitted to the station demand control device 11 of the station (step S23). After that, it waits for the predetermined time T3 corresponding to the response time when the power value changes according to the command to elapse (step S24), and when the predetermined time T3 elapses, the process returns to step S11 and the above procedure is repeated.

By performing the above control by the cooperative control device 60, when the power demand increases, the power saving control for reducing the power consumption of the equipment is equally executed at each station, and the voltage on the terminal side of the distribution line 20 becomes equal to or less than the allowable value. It is possible to avoid lowering, and it is possible to avoid the occurrence of a station building where extremely power saving control is forced.
The control device 54 of the power storage device 50 that received the discharge start command from the cooperative control device 60 in step S16 starts discharging and monitors the charge amount, and when the charge amount becomes equal to or less than a predetermined value, the cooperative control device 60 starts. Discharge is stopped by the command of, and charging of the battery is started. Further, the control device 54 of the power storage device 50 may be configured to stop the discharge at its own discretion and control to charge the battery while the discharge is not performed.

(Modification example)
Next, a modified example of the above embodiment will be described. This modification is a control procedure of the cooperative control device 60 in the case where the concept of giving priority to energy saving is adopted when the charge command to the power storage device 50 is given, and the flowchart thereof is shown in FIG.
In the flowchart of FIG. 6, a step S14a for determining whether or not the number of control stages for power saving is the largest in all station buildings is provided between steps S14 and S15 of the flowchart of FIG.

According to this flowchart, when it is determined in step S14a that the number of control stages at all stations is the maximum (Yes), the process proceeds to step S15, a discharge start command is issued to the control device 54 of the power storage device 50, and all stations If it is determined that the number of control stages is not the maximum (No), the process proceeds to step S18, and a control command for reducing the number of control stages by one is transmitted to the station demand control device 11.
By executing the above control, when the discharge time of the power storage device 50 is limited and the power demand of all stations in the system continues to be high for a long time, the distribution line 20 It is possible to prevent the voltage on the terminal side from dropping below the permissible value.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the battery 51 of the power storage device 50 is configured to be charged only by the electric power from the substation 30A or 30B, but includes an inverter connected to the electric wire to convert direct current into alternating current. , It may be configured to be charged by the regenerative power generated by the inverter.
Further, in the above embodiment, the case where the present invention is applied to a power supply system provided with a power storage device connected to a distribution line has been described, but the present invention is applied to a power supply system not provided with a power storage device. Is also possible.

10A, 10B, 10C Station building (station electrical equipment)
11A, 11B, 11C Station demand controller 20 Distribution line 30A, 30B Substation 41, 42, 43 Circuit breaker 50 Power storage device 51 Battery 54 Charge / discharge control device 60 Coordinated control device

Claims (5)

A distribution line that receives AC power from a substation and supplies power to multiple station buildings,
A plurality of local demand control devices provided in each of the plurality of station buildings and capable of outputting instructions for reducing power demand to the electrical equipment of the corresponding station building.
A cooperative control device that acquires information on a received power value and a control state from the plurality of local demand control devices and sends a control command value related to the demand power to each of the plurality of local demand control devices. A power coordination control system at a plurality of stations that regulates AC power supplied from the distribution line to each of the electrical equipment of the plurality of station buildings.
The local demand control device is
A power measuring means that measures the received power of each station building,
A storage device that stores an energy-saving control table that shows the relationship between multiple power-saving control stages and the amount of power saved in the electrical equipment of the station building.
When the received power exceeds a preset value based on the power value measured by the power measuring means, the power saving control stage is determined and the energy saving control table is referred to based on the determined power saving control stage. It has a function to output an instruction to reduce the power demand to the electric equipment of its own station building and a function to output an instruction to reduce the power demand to the electric equipment of its own station building in response to a control command from the cooperative control device. Equipped with power suppression means,
When the total value of the received power values acquired from the plurality of local demand control devices exceeds a preset value, the coordinated control device sets the power saving control stage of coordinated control based on the acquired control state information. Calculate the total power saving control stage by adding the power saving control stage of each station building, extract the station building with the lowest total power saving control stage, and send a control command to raise the power saving control stage to the corresponding local demand control device. A power coordination control system at multiple stations, which is characterized by being configured in. In the energy saving control table, information on the power saving rate of the electric equipment arranged in each of a plurality of preset areas among the electric equipment of the corresponding station building is described.
The local demand control device determines the power demand of the electrical equipment of its own station building based on the power saving control stage determined by determining its own power saving control stage or the power saving control stage designated by the control command from the cooperative control device. The first aspect of claim 1, wherein the amount of power saving of the electric equipment in each area is determined with reference to the energy saving control table, and an instruction for power saving is output to the electric equipment. Power coordination control system at multiple stations. The electrical equipment includes at least lighting equipment and air conditioning equipment.
The power coordination control system at a plurality of stations according to claim 2, wherein in the energy saving control table, different power saving rates for the lighting equipment and the air conditioning equipment are described for each power saving control stage. A secondary battery and a power storage device provided with charge / discharge control means for the secondary battery are connected to the distribution line.
The cooperative control device sends a command to start discharging to the charge / discharge control means when the total value of the received power values acquired from the plurality of local demand control devices exceeds a preset value. The power cooperative control system at a plurality of stations according to any one of claims 1 to 3, wherein the power cooperative control system is configured to be used. The charge / discharge control means has a function of transmitting at least information indicating a charge / discharge state and a charge amount to the cooperative control device.
The cooperative control device is conditioned on the charge amount of the power storage device being equal to or more than a predetermined value when the total value of the received power values acquired from the plurality of local demand control devices exceeds a preset value. The power cooperative control system at a plurality of stations according to claim 4, wherein a command for starting discharge is generated and sent to the charge / discharge control means.

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