JP5608841B1 - System power management system, master station device, relay station device, and program - Google Patents

Abstract

  An object of the present invention is to perform effective power saving in a situation where power supply is tight, and the master station device determines that the current value of the load flow at a predetermined location of the power system exceeds a preset upper limit value. In this case, an interruption amount calculation unit that calculates an interruption amount indicating a load amount to be interrupted by subtracting the upper limit value from the current value, and an assignment amount calculation that calculates an assignment amount in which the interruption amount is assigned to each relay station device And a first communication unit that transmits an allocation amount to each relay station device, and each relay station device distributes a load among loads in which a communicable slave station device is installed based on the allocation amount. A load selection unit that selects a load to be disconnected from the electric wire, and a second unit that receives an allocation amount from the master station device and transmits a cutoff command to a slave station device installed in the load selected by the load selection unit Each slave station device is shielded from any relay station device. And a third communication unit for receiving a command, and a circuit breaker control unit to open the circuit breaker in accordance with the disconnection instruction.

Description

  The present invention relates to a system power management system, a master station device, a relay station device, and a program.

  In an electric power system, in order to ensure the electric power quality, the system operation according to the supply and demand situation of electric power is performed. In addition, a system that adjusts the supply and demand of power by predicting and calculating the power demand of the customer and the load flow of the power system, and actually measuring and collecting it is also used in order to perform appropriate system operation. Yes.

  For example, in Patent Document 1, a master station device installed in a substation, a relay station device installed in a transformer, and a slave station device installed in a power equipment facility cooperate to generate power in the power system. An electric power supply and demand adjustment system for adjusting supply and demand is disclosed. In this system, the surplus power of the distributed power source is charged to the storage battery, and the power from the storage battery is accommodated for insufficient power of the load, or when the power cannot be accommodated, the load is suppressed or cut off. The power system is stabilized when the power supply is introduced.

JP 2012-19598 A

  By the way, in recent years when power supply is tight, in order to avoid a large-scale power outage without forcing a heavy burden such as a rotating power outage to the customer, power saving is demanded from the customer. In such a situation, it is necessary to save electricity effectively while ensuring the power supply to the necessary customer facilities, and to appropriately manage the supply and demand of power.

  However, in the power supply and demand adjustment system of Patent Document 1, when the load is suppressed or cut off, the relay station device having the largest transformer power is identified preferentially, and the customer power under the relay station device is the largest. The slave station device is preferentially specified to instruct suppression or blocking. Therefore, it is necessary to sequentially instruct the slave station devices via the relay station device one by one until the necessary load suppression (cutoff) amount is secured, and it may take time to adjust the power supply and demand. Particularly in a situation where power supply is tight, it is difficult to effectively save electricity and appropriately manage power supply and demand.

  The main present invention that solves the above-described problems is a plurality of substations that receive power from the upper system and supply the distribution lines, and a plurality of loads that are connected to the distribution lines via circuit breakers, respectively. A system power management system for managing supply and demand of power in a power system including a plurality of relay station devices respectively installed in the plurality of substations, and a plurality of relay stations respectively installed in the plurality of loads A plurality of slave station devices communicable with any one of the devices, and a master station device communicable with each of the plurality of relay station devices, the master station device of the load flow at a predetermined location of the power system When a current value exceeds a preset upper limit value, a cutoff amount calculation unit that calculates a cutoff amount indicating a load amount to be blocked by subtracting the upper limit value from the current value; and the cutoff amount The plurality of relay station devices An allocation amount calculation unit that calculates an allocation amount allocated to each of the plurality of relay station devices; and a first communication unit that transmits the allocation amount to each of the plurality of relay station devices. Receives, based on the allocated amount, a load selection unit that selects a load to be disconnected from the distribution line among loads in which communicable slave station devices are installed, and receives the allocated amount from the parent station device And a second communication unit that transmits a cut-off command to a slave station device installed in the load selected by the load selection unit, and each of the plurality of slave station devices includes the plurality of relay stations A system power management system comprising: a third communication unit that receives the breaking command from any of the devices; and a breaker control unit that opens the breaker in response to the breaking command.

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the present invention, it is possible to effectively save power in a situation where power supply is tight, and to maintain and manage power supply and demand in an appropriate state.

It is a block diagram which shows the structure of the system power management system in one Embodiment of this invention. It is a block diagram which shows the structure of a main | base station apparatus. It is a block diagram which shows the structure of a relay station apparatus. It is a block diagram which shows the structure of a subunit | mobile_unit apparatus. It is a flowchart explaining operation | movement of the system | strain power management system in one Embodiment of this invention.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

=== System Power Management System Configuration ===
Hereinafter, with reference to FIG. 1 thru | or FIG. 4, the structure of the system power management system in one Embodiment of this invention is demonstrated. In FIG. 1, electric lines (distribution lines) are indicated by solid lines, and (wired or wireless) communication lines are indicated by broken lines.

  The power system shown in FIG. 1 includes, for example, substations # 1 to # 3 and loads (customer facilities) L1 to L9 installed in customers # 1 to # 9, respectively. Substations # 1 to # 3 are equipped with transformers T1 to T3, respectively. Each transformer is connected to the upper system on the primary side, and supplies power received from the upper system to the distribution lines from the secondary side. doing. Further, the loads L1 to L9 are connected to the distribution line via circuit breakers (not shown). Here, consumers # 2 to # 4 and # 6 to # 8 are consumers (hereinafter referred to as contract customers) who have concluded a power usage restriction contract for individually limiting power consumption. Assume that # 1, # 5, and # 9 do not have a power usage restriction contract.

  The system power management system of this embodiment is a system for managing the supply and demand of power in the power system, and includes a master station device 10, relay station devices 21 to 23, and slave station devices 32 to 34, 36 to 38. It consists of The master station device 10 is installed, for example, in a higher-level substation and is operated by a system operator. Further, the relay station devices 21 to 23 are installed in the substations # 1 to # 3, respectively, and each relay station device can communicate with the master station device 10. Further, the slave station devices 32 to 34 and 36 to 38 are respectively installed in the loads L2 to L4 and L6 to L8 of the contract consumer, and each slave station device is one of the relays connected by a broken line. Communication with the station device is possible.

  FIG. 2 shows a configuration of the master station device 10 in the present embodiment. 2 is connected to each other via a bus 109. An upper limit value setting unit 101, a cutoff amount calculation unit 102, an allocation amount calculation unit 103, an input / output unit 106, a storage unit 107, And a (first) communication unit 108. Note that the functions of the upper limit setting unit 101, the blockage amount calculation unit 102, and the allocation amount calculation unit 103 in the master station device 10 can also be realized by causing the processing unit (processor) 100 to execute a program. . The communication unit 108 is connected to a communication path indicated by a broken line.

  FIG. 3 shows the configuration of each relay station device 2x (x = 1 to 3) in the present embodiment. The relay station device 2x shown in FIG. 3 includes a priority setting unit 201, a load selection unit 202, an input / output unit 206, a storage unit 207, and a (second) communication, which are connected to each other via a bus 209. The unit 208 is configured to be included. In the relay station device 2x, the functions of the priority order setting unit 201 and the load selection unit 202 can also be realized by causing the processing unit (processor) 200 to execute a program. Communication unit 208 is connected to a communication path indicated by a broken line.

  FIG. 4 shows a configuration of each slave station device 3y (y = 2 to 4, 6 to 8) in the present embodiment. The slave station device 3y shown in FIG. 4 includes a circuit breaker control unit 301, an input / output unit 306, a storage unit 307, and a (third) communication unit 308 connected to each other via a bus 309. It is configured. In the slave station device 3y, the function of the circuit breaker control unit 301 can also be realized by causing the processing unit (processor) 300 to execute a program. Communication unit 308 is connected to a communication path indicated by a broken line.

=== Operation of the grid power management system ===
Hereinafter, the operation of the grid power management system in the present embodiment will be described with reference to FIG. 5 as appropriate. FIG. 5 shows an operation in which the master station device 10, the relay station device 2x, and the slave station device 3y cooperate. In FIG. 5, the operation of the master station device 10 is shown on the left side. The operation of 2x or slave station device 3y is shown on the right side.

  The upper limit value setting unit 101 of the master station device 10 first sets in advance an upper limit value Pth of the load flow measured at a predetermined location of the power system (S11). For example, the system operator inputs the upper limit value Pth via the keyboard (input / output unit 106), and the upper limit value setting unit 101 stores the input upper limit value Pth in the storage unit 107. Note that the predetermined location (load flow measurement location) may be a plurality of locations, and even if the upper limit value Pth is set for each of the load flows at the plurality of locations, the total value of the load flows at the plurality of locations. Alternatively, an upper limit value Pth may be set.

  On the other hand, the priority setting unit 201 of each relay station device 2x is first cut off from the load Ly under the relay station device 2x (a slave station device 3y capable of communicating with the relay station device 2x is installed). The priority order Ry is set in advance and stored in the storage unit 207 (S21). That is, the relay station device 21 sets the priority (R2, R3) of the load (L2, L3), the relay station device 22 sets the priority (R4, R6) of the load (L4, L6), The relay station device 23 sets the priority (R7, R8) of the load (L7, L8). The priority order Ry is set, for example, in descending order of load Ly. Further, the priority order Ry may be set according to the power charge in the power usage restriction contract. For example, the priority order Ry may become smaller (easy to be cut off) as the power charge is lower.

  Next, the cutoff amount calculation unit 102 of the master station device 10 acquires the current value P at the load flow measurement location via, for example, the input port (input / output unit 106) (S12) and compares it with the upper limit value Pth. (S13). Then, when the current value P exceeds the upper limit value Pth for a predetermined time (S13: YES), the upper limit value Pth is subtracted from the current value P to indicate a cut-off amount ΔP (= P -Pth) is calculated (S14).

Next, the allocation amount calculation unit 103 of the master station device 10 calculates an allocation amount ΔPx in which the blocking amount ΔP is allocated to each relay station device 2x (S15). Note that the allocation amount ΔPx is equally allocated to each relay station device 2x, for example.
ΔP1 = ΔP2 = ΔP3 = ΔP / 3
Is calculated. Further, for example, the allocation amount ΔPx may be calculated so as to be proportional to the size of the load Ly under the control of each relay station device 2x.
ΔP1 = ΔP × (L2 + L3) / (L2 + L3 + L4 + L6 + L7 + L8)
ΔP2 = ΔP × (L4 + L6) / (L2 + L3 + L4 + L6 + L7 + L8)
ΔP3 = ΔP × (L7 + L8) / (L2 + L3 + L4 + L6 + L7 + L8)
Is calculated. Then, the calculated allocation amount ΔPx is transmitted from the communication unit 108 to each relay station device 2x.

  When the communication unit 208 of the relay station device 2x receives the allocation amount ΔPx (S22: YES), the load selection unit 202 should be disconnected from the distribution line among the loads Ly under the relay station device 2x according to the priority order Ry. The load Lz (z is one of y = 2 to 4 and 6 to 8) is selected. Moreover, when the interruption command is transmitted from the communication unit 208 to the slave station device 3z installed in the selected load Lz and the communication unit 308 of the slave station device 3z receives the cutoff command, the circuit breaker control unit 301 Then, the circuit breaker is opened and the load Lz is disconnected from the distribution line (S23).

  Further, the relay station device 2x waits until the actual cut-off amount Bx indicating the actual load amount selected / separated becomes equal to or larger than the allocation amount ΔPx or until all subordinate loads are selected / separated (S24: NO). And S25: NO), the load Lz is sequentially selected and disconnected according to the priority order Ry (S23). When the actual blocking amount Bx becomes equal to or larger than the allocated amount ΔPx or when all the subordinate loads are selected and disconnected (S24: YES or S25: YES), the actual blocking amount Bx is transferred from the communication unit 208 to the master station device 10. Sent.

  Here, in the present embodiment, the priority order setting unit 201 of the relay station device 2x resets the priority order Ry (S21). In the resetting, the load Ly under the relay station device 2x is selected evenly by increasing the priority order Rz of the disconnected load Lz (not easily blocked).

  When the communication unit 108 of the master station device 10 receives the actual cut-off amount Bx (S16: YES), the allocation amount calculation unit 103 performs reallocation as necessary. That is, when the actual cut-off amount Bx is equal to or greater than the assigned amount ΔPx in all relay station devices (S17: YES), the necessary load suppression (cut-off) amount is secured and the power supply / demand adjustment is terminated. Moreover, when all the subordinate loads are selected and disconnected in all relay station apparatuses (S18: YES), the load cannot be further suppressed (blocked), so the power supply / demand adjustment is terminated. On the other hand, in any one of the relay station devices 2x, if the actual cut-off amount Bx falls below the assigned amount ΔPx even if all the subordinate loads are selected and disconnected (S17: NO and S18: NO), A new allocation amount ΔPx in which the amount (ΔPx−Bx) less than the amount is allocated to each other relay station device is calculated (S15), and the processing from S22 is performed again.

  As described above, in the system power management system shown in FIG. 1, when the current value P of the load flow exceeds the preset upper limit value Pth, the master station device 10 determines the cutoff amount ΔP (= P−Pth). ) Is assigned to each relay station device 2x, and each relay station device 2x selects a load Lz to be disconnected from the subordinate loads Ly based on the assigned amount ΔPx. The slave station device 3z installed in the selected load Lz performs load suppression (blocking) in parallel at each substation (relay station device 2x) by opening the circuit breaker and disconnecting the load Lz. To ensure the necessary amount of load suppression (shutoff) quickly, so that power can be saved effectively, especially when power supply is tight, and the supply and demand of power can be maintained and managed in an appropriate state. Can do. Furthermore, a new service (power usage restriction contract) using the grid power management system can be provided to consumers who are highly conscious of power saving and power charges.

  Further, in any relay station device 2x, when the actual cut-off amount Bx falls below the assigned amount ΔPx, the reallocation amount that assigns the amount (ΔPx−Bx) below the assigned amount to the other relay station devices. By performing the above, it is possible to secure a necessary load suppression (cutoff) amount that could not be secured by the initial allocation and perform appropriate power supply and demand adjustment.

  Further, when the current value P of the load flow exceeds the upper limit value Pth for a predetermined time, by calculating the cut-off amount ΔP and the assigned amount ΔPx, frequent load suppression (cut-off) is prevented, and power usage It is possible to reduce the burden on contract customers who have signed restricted contracts.

  In addition, by selecting the load Lz to be disconnected in accordance with a preset priority order, effective power saving is achieved while securing power supply to consumer facilities that require particularly power supply such as lifeline. , Power supply and demand can be managed appropriately.

  Further, in the master station device 10, by causing the processing unit (processor) 100 to execute a program, the function of the blocking amount calculation unit 102 (blocking amount calculation processing) and the function of the allocation amount calculation unit 103 (allocation amount calculation processing). Can be realized.

  Further, in the relay station device 2x, the function (load selection process and cutoff command output process) of the load selection unit 202 can be realized by causing the processing unit (processor) 200 to execute a program.

  In addition, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

10 Master station device 2x (21 to 23) Relay station device 3y (32 to 34, 36 to 38) Slave station device 100, 200, 300 Processing unit (processor)
101 Upper limit setting unit 102 Blocking amount calculation unit 103 Allocation amount calculation unit 106, 206, 306 Input / output unit 107, 207, 307 Storage unit 108, 208, 308 Communication unit 109, 209, 309 Bus 201 Priority order setting unit 202 Load Selection part 301 Circuit breaker control part T1-T3 Transformer L1-L9 Load (customer equipment)

Claims (10)

A plurality of substations that receive power from the upper system and supply it to the distribution lines;
A plurality of loads each linked to the distribution line via a circuit breaker;
A grid power management system for managing the supply and demand of power in a power system including
A plurality of relay station devices respectively installed in the plurality of substations;
A plurality of slave station devices respectively installed in the plurality of loads and capable of communicating with any of the plurality of relay station devices;
A master station device capable of communicating with each of the plurality of relay station devices;
With
The master station device is
When the current value of the load flow at a predetermined location of the power system exceeds a preset upper limit value, the upper limit value is subtracted from the current value to calculate a cut-off amount indicating the load amount to be cut off. A blocking amount calculation unit;
An allocation amount calculation unit that calculates an allocation amount in which the blocking amount is allocated to each of the plurality of relay station devices;
A first communication unit that transmits the allocated amount to each of the plurality of relay station devices;
Have
Each of the plurality of relay station devices is
Based on the allocated amount, a load selection unit that selects a load to be disconnected from the distribution line among loads in which communicable slave station devices are installed, and
A second communication unit that receives the allocated amount from the master station device and transmits a cutoff command to a slave station device installed in a load selected by the load selection unit;
Have
Each of the plurality of slave station devices is
A third communication unit that receives the cutoff command from any of the plurality of relay station devices;
A circuit breaker control unit that opens the circuit breaker according to the circuit break command;
A system power management system comprising: The system power management system according to claim 1,
The second communication unit transmits an actual cut-off amount indicating the load amount selected by the load selection unit and disconnected from the distribution line to the master station device,
The allocation amount calculation unit allocates an amount below the allocated amount to each of the other relay station devices when the actual blocking amount is below the allocated amount in any of the plurality of relay station devices. A system power management system characterized by further calculating the allocated amount. The system power management system according to claim 1 or 2,
The cutoff power calculation unit calculates the cutoff power when the current value exceeds the upper limit value for a predetermined time. A system power management system according to any one of claims 1 to 3,
The grid power management system, wherein the load selection unit selects a load to be disconnected from the distribution line according to a preset priority order. A plurality of substations that receive power from the upper system and supply it to the distribution lines;
A plurality of loads each linked to the distribution line via a circuit breaker;
In order to manage the supply and demand of power in the power system including
A plurality of slave station devices that are respectively installed in the plurality of loads and open the circuit breaker in response to a break command;
A slave station installed at each of the plurality of substations, selecting a load to be disconnected from the distribution line among the plurality of loads based on the allocated amount allocated to each of the substations, and installed at the selected load A plurality of relay station devices that transmit the cutoff command to a device;
A master station device used together,
When the current value of the load flow at a predetermined location of the power system exceeds a preset upper limit value, the upper limit value is subtracted from the current value to calculate a cut-off amount indicating the load amount to be cut off. A blocking amount calculation unit;
An allocation amount calculating unit that calculates the allocation amount in which the blocking amount is allocated to each of the plurality of relay station devices;
A communication unit that transmits the allocated amount to each of the plurality of relay station devices;
A master station apparatus characterized by comprising: The master station device according to claim 5,
The allocated amount calculation unit, when the actual cut-off amount indicating the load amount disconnected from the distribution line is less than the allocated amount in any of the plurality of relay station devices, the allocated amount is below the allocated amount A master station device characterized by further calculating an allocation amount in which the amount is allocated to each of other relay station devices. A plurality of substations that receive power from the upper system and supply it to the distribution lines;
A plurality of loads each linked to the distribution line via a circuit breaker;
In order to manage the supply and demand of power in the power system including
When the current value of the load flow at a predetermined location of the power system exceeds a preset upper limit value, a master station device that calculates a cut-off amount indicating a load amount to be cut off,
A plurality of slave station devices that are respectively installed in the plurality of loads and open the circuit breaker in response to a break command;
A relay station device used in each of the plurality of substations,
A load selection unit that selects a load to be disconnected from the distribution line among the plurality of loads, based on an allocation amount in which the blocking amount is allocated to each relay station device;
A communication unit that receives the allocated amount from the master station device and transmits the cutoff command to a slave station device installed in a load selected by the load selection unit;
A relay station apparatus comprising: The relay station apparatus according to claim 7, wherein
The said load selection part selects the load which should be disconnected from the said distribution line according to the priority set beforehand, The relay station apparatus characterized by the above-mentioned. A plurality of substations that receive power from the upper system and supply it to the distribution lines;
A plurality of loads each linked to the distribution line via a circuit breaker;
In order to manage the supply and demand of power in the power system including
A plurality of slave station devices that are respectively installed in the plurality of loads and open the circuit breaker in response to a break command;
A slave station installed at each of the plurality of substations, selecting a load to be disconnected from the distribution line among the plurality of loads based on the allocated amount allocated to each of the substations, and installed at the selected load A plurality of relay station devices that transmit the cutoff command to a device;
In the processor of the master station device used together,
When the current value of the load flow at a predetermined location of the power system exceeds a preset upper limit value, the upper limit value is subtracted from the current value to calculate a cut-off amount indicating the load amount to be cut off. Blockage amount calculation processing;
An allocation amount calculation process for calculating the allocation amount in which the blocking amount is allocated to each of the plurality of relay station devices;
A program characterized by having executed. A plurality of substations that receive power from the upper system and supply it to the distribution lines;
A plurality of loads each linked to the distribution line via a circuit breaker;
In order to manage the supply and demand of power in the power system including
When the current value of the load flow at a predetermined location of the power system exceeds a preset upper limit value, a master station device that calculates a cut-off amount indicating a load amount to be cut off,
A plurality of slave station devices that are respectively installed in the plurality of loads and open the circuit breaker in response to a break command;
The processor of the relay station device used together and installed in each of the plurality of substations,
Load selection processing for selecting a load to be disconnected from the distribution line among the plurality of loads, based on an allocation amount in which the blocking amount is allocated to each relay station device;
A shut-off command output process for outputting the shut-off command for the slave station device installed in the selected load;
A program characterized by having executed.

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