Power factor adjustment device, power factor adjustment method, and program

Abstract

To efficiently enhance a power factor in accordance with an operation state.SOLUTION: A power factor adjusting device adjusts a power factor of an electric power facility including a plurality of buses, a plurality of capacitors, a communication path and a breaker and comprises: a reactive power calculation section for calculating reactive power; and a control section for controlling turning-on or open-circuiting of the plurality of capacitors. In the power factor adjusting device, the control section controls the turning-on or the open-circuiting of the capacitors connected to the buses based on the reactive power of each bus calculated by the reactive power calculation section in a case where the communication path is open-circuited by the breaker, controls the turning-on or the open-circuiting of the capacitors connected to the buses based on the reactive power of each bus in a case where the plurality of buses is caused to communicate with each other by the breaker, and controls the turning-on or the open-circuiting of the plurality of capacitors connected to the plurality of buses caused to communicate with each other by the breaker based on the reactive power calculated using the reactive power, which is calculated by the reactive power calculation section, of the plurality of buses caused to communicate with each other by the breaker.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a power factor adjustment device, a power factor adjustment method, and a program. [Background technology]

[0002] Conventionally, the technologies described in Patent Documents 1 and 2 are known as techniques for controlling the power factor. The power factor control method for power factor correction capacitors described in Patent Document 1 comprises a plurality of transformers, power factor correction capacitors connected to the secondary side of each transformer via contactors, and a secondary bus connection connecting the secondary sides of the transformers, and performs power factor control by switching the power factor correction capacitors on or off according to the load state of the transformers.

[0003] The reactive power control device described in Patent Document 2 has multiple busbars that receive power from a power company's power source and a busbar connecting circuit breaker that links the multiple busbars, and controls reactive power correction capacitors connected to the multiple busbars. The reactive power control device controls the reactive power correction capacitors based on the reactive power of each system on the power source side connected to each busbar, and the reactive power passing through the busbar connecting circuit breaker. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 54-118554 [Patent Document 2] Japanese Patent Publication No. 64-60229 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The leading power factor capacitor input control method described in Patent Document 1 measures the reactive power in the secondary side of each transformer and in the secondary bus connection during parallel operation of transformers, calculates the reactive power of the load for each transformer from the measured value of the reactive power, and controls the input of the corresponding leading power factor capacitor for each transformer based on the reactive power of the load for each transformer. However, the leading power factor capacitor input control method described in Patent Document 1 cannot improve the power factor for the entire plurality of buses during parallel operation in which a plurality of buses are connected.

[0006] The reactive power control device described in Patent Document 2 controls the reactive power correction capacitor based on the reactive power for each system on the power supply side connected to each individual bus and the reactive power passing through the bus connection breaker, regardless of whether it is in parallel operation or single operation. Therefore, it cannot efficiently improve the power factor according to the operating state.

[0007] This disclosure has been made in view of such circumstances, and an object thereof is to provide a power factor adjustment device, a power factor adjustment method, and a program that can efficiently improve the power factor according to the operating state.

Means for Solving the Problems

[0008] This disclosure has been made to solve the above-described problems, and one aspect of this disclosure is a power factor adjustment device that adjusts the power factor of a power system including a plurality of transformers that transform received power, a plurality of buses connected to each of the plurality of transformers, one or a plurality of capacitors connected to each of the plurality of buses, a connection path that connects between the plurality of buses, and a breaker that connects or disconnects the connection path, wherein the reactive power for each of the plurality of buses is calculated Then, the reactive power is calculated using the reactive power of multiple busbars.It includes a reactive power calculation unit and a control unit that controls the connection or disconnection of the one or more capacitors. When the connection path is opened by the circuit breaker, the control unit controls the connection or disconnection of the capacitors connected to each bus based on the reactive power of each bus calculated by the reactive power calculation unit. When multiple buses are connected by the circuit breaker, the control unit controls the connection or disconnection of the capacitors connected to each bus based on the reactive power of each bus calculated by the reactive power calculation unit. Perform a first control, and after the first control Based on the reactive power calculated using the reactive power of the multiple buses connected by the circuit breaker, control the connection or disconnection of the multiple capacitors connected to the multiple buses connected by the circuit breaker. Perform the second control. It is a power factor adjustment device.

[0009] Another aspect of the present disclosure is a power factor adjustment method for adjusting the power factor of a power facility including a plurality of transformers that transform received power, a plurality of buses connected to each of the plurality of transformers, one or more capacitors connected to each of the plurality of buses, a connection path connecting between the plurality of buses, and a circuit breaker that connects or disconnects the connection path. The method includes steps of determining whether the connection path is opened or connected by the circuit breaker, when it is determined that the connection path is opened by the circuit breaker, calculating the reactive power for each of the plurality of buses, and connecting or disconnecting the capacitors connected to each bus based on the calculated reactive power of each bus; when it is determined that multiple buses are connected by the circuit breaker, calculating the reactive power for each of the plurality of buses, and connecting or disconnecting the capacitors connected to each bus based on the calculated reactive power of each bus. Perform the first control step; After the first control described above Calculating the reactive power of the multiple buses connected by the circuit breaker, and connecting or disconnecting the multiple capacitors connected to the multiple buses connected by the circuit breaker based on the reactive power calculated using the reactive power of the multiple buses. Perform the second control. step, and includes a power factor adjustment method.

[0010] Other aspects of the present disclosure include a power factor adjustment device for adjusting the power factor of a power facility comprising: a plurality of transformers for transforming received power; a plurality of busbars connected to each of the plurality of transformers; one or more capacitors connected to each of the plurality of busbars; a connecting path connecting the plurality of busbars; and a circuit breaker for closing or opening the connecting path, the computer of the power factor adjustment device for adjusting the power factor of the power facility comprising: a plurality of transformers for transforming received power; a plurality of busbars connected to each of the plurality of transformers; one or more capacitors connected to each of the plurality of busbars connected to each of the plurality of busbars; a computer for adjusting the power factor of a power facility comprising: a plurality of transformers for transforming received power; a plurality of busbars connected to each of the plurality of transformers; one or more capacitors connected to each of the plurality of busbars connected to each of the busbars connected to each of the busbars, connected to each of the connected busbars, connected to each connected busbar, and connected to each connected busbar, connected to each connected busbar, and connected to each connected busbar, respectively. Perform the first control Steps and After the first control described above The circuit breaker calculates the reactive power of the multiple busbars connected by it, and based on the reactive power calculated using the reactive power of the multiple busbars, it switches on or off the multiple capacitors connected to the multiple busbars connected by it. Perform the second control. It is a program that executes steps. [Effects of the Invention]

[0011] According to one aspect of the present invention, the power factor can be efficiently improved according to the operating conditions. [Brief explanation of the drawing]

[0012] [Figure 1] This is a block diagram showing an example of a power system in an embodiment. [Figure 2] This is a block diagram showing an example of a power factor adjustment device in an embodiment. [Figure 3] This flowchart shows an example of the operation procedure of the power factor adjustment device in the embodiment. [Figure 4] This is a block diagram illustrating an example of the operation of the power system in the embodiment. [Figure 5] This is a block diagram illustrating another example of the operation of the power system in the embodiment. [Modes for carrying out the invention]

[0013] The power factor adjustment device, power factor adjustment method, and program to which the present invention is applied will be described below with reference to the drawings.

[0014] (First Embodiment) Figure 1 is a block diagram showing an example of a power system in an embodiment. The power system includes, for example, a power factor adjustment device 100 and power equipment. The power equipment includes, for example, a plurality of current detectors 200A, 200B, 200C, 200D, 200E, and 200F, transformers T1, T2, T3, T10, T20, and T30, a plurality of busbars 202A, 202B, and 202C, connecting paths 204A, 204B, and 204C, one or more capacitors C11, C12, C21, C22, C31, C32, and a plurality of circuit breakers S1, S2, S3, S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25, S31, S32, S33, and S34. In the following explanation, when referring to multiple current detectors collectively, they will be referred to as current detector 200; when referring to multiple transformers collectively, they will be referred to as transformer T; when referring to multiple busbars collectively, they will simply be referred to as busbar 202; when referring to multiple connecting paths collectively, they will be referred to as connecting path 204; and when referring to multiple capacitors collectively, they will simply be referred to as capacitor C.

[0015] In this embodiment, the power system has busbars 202A, 202B, and 202C that are interconnected, but is not limited to this; there may be two or more busbars 202, and not all busbars 202 need to be interconnected. Also, in this embodiment, power supply equipment A, B, and C are connected, but is not limited to this; a single grid power may branch off and be connected to each busbar 202.

[0016] The power system is supplied with power from power supply facilities A, B, and C, respectively. Power supply equipment A is connected to busbar 202A via circuit breaker S1. Busbar 202A is connected to load A via transformer T10 and circuit breaker S11. Power supplied from power supply equipment A is supplied to busbar 202A via circuit breaker S1. Transformer T10 transforms the received power supplied to busbar 202A and supplies the transformed received power to load A via circuit breaker S11. Power supply equipment B is connected to busbar 202B via circuit breaker S2. Busbar 202B is connected to load B via transformer T20 and circuit breaker S21. Power supplied from power supply equipment B is supplied to busbar 202B via circuit breaker S2. Transformer T20 transforms the received power supplied to busbar 202B and supplies the transformed received power to load B via circuit breaker S21. Power supply equipment C is connected to busbar 202C via circuit breaker S3. Busbar 202C is connected to load C via transformer T30 and circuit breaker S31. Power supplied from power supply equipment C is supplied to busbar 202C via circuit breaker S3. Transformer T30 transforms the received power supplied to busbar 202C and supplies the transformed received power to load B via circuit breaker S31.

[0017] Busbar 202A is connected in parallel to circuit breaker S12 and capacitor C11, and to circuit breaker S13 and capacitor C12. Busbar 202A is connected to a connecting path 204A between busbar 202A and busbar 202B. Busbar 202A is connected to a connecting path 204C between busbar 202A and busbar 202C. Connecting path 204A is equipped with circuit breaker S15, current detector 200A, and circuit breaker S16. Busbar 202A is connected to a transformer T1 for measuring busbar voltage. Current detector 200A detects the current value flowing through connecting path 204A and measures the busbar connecting current I A A signal indicating this is output to the power factor adjustment device 100. Transformer T1 controls the bus voltage V at busbar 202A. A A signal indicating this is output to the power factor adjustment device 100.

[0018] Busbar 202B is connected in parallel to circuit breaker S22 and capacitor C21, and to circuit breaker S23 and capacitor C22. Busbar 202B is connected to the connecting path 204A between busbars 202A and 202B. Busbar 202B is connected to the connecting path 204B between busbars 202B and 202C. Connecting path 204B is equipped with circuit breaker S24, current detector 200B, and circuit breaker S25. Busbar 202B is connected to the transformer T2 for measuring busbar voltage. Current detector 200B detects the current value flowing through connecting path 204B and measures the busbar connecting current I B A signal indicating this is output to the power factor adjustment device 100. Transformer T2 controls the bus voltage V at busbar 202B. B A signal indicating this is output to the power factor adjustment device 100.

[0019] Busbar 202C is connected in parallel to circuit breaker S32 and capacitor C31, and to circuit breaker S33 and capacitor C32. Busbar 202C is connected to busbar 204B, which connects busbar 202B and busbar 202C. Busbar 202C is connected to busbar 204C, which connects busbar 202C and busbar 202A, which connects busbar 202C. Circuit breaker S14, current detector 200C, and circuit breaker S34 are provided in the connecting path 204C. A transformer T3 for measuring busbar voltage is connected to busbar 202C. Current detector 200C detects the current value flowing through the connecting path 204C and measures the busbar connecting current I C A signal indicating this is output to the power factor adjustment device 100. Transformer T3 controls the bus voltage V at busbar 202C. C A signal indicating this is output to the power factor adjustment device 100.

[0020] The current detector 200D is installed in the line between power supply equipment A and busbar 202A. The current detector 200D detects the current value of the power supplied from power supply equipment A and the receiving current I of busbar 202A. A A signal indicating this is output to the power factor adjustment device 100. The current detector 200E is installed in the line between the power supply equipment B and the busbar 202B. The current detector 200E detects the current value of the power supplied from the power supply equipment B and the receiving current I of the busbar 202B. BOutputs a signal indicating [the situation] to the power factor correction device 100. The current detector 200F is provided in the line between the power supply equipment C and the bus 202C. The current detector 200F detects the current value of the power supplied from the power supply equipment C and the received current I of the bus 202C C Outputs a signal indicating [the situation] to the power factor correction device 100.

[0021] The states of a plurality of circuit breakers S1, S2, S3, S11, S12, S13, S14, S15, S16, S21, S22, S23, S24, S25, S31, S32, S33, and S34 are controlled between the on state and the off state. The on state is a state where electrical conduction is established to supply power. The off state is a state where electrical insulation is established to cut off power. The states of a plurality of circuit breakers S15 and S16, S24 and S25, and S14 and S31 are controlled by a system including, for example, the power supply equipment A, B, and C. The states of a plurality of circuit breakers S12, S13, S22, S23, S32, and S33 are controlled by the power factor correction device 100.

[0022] The capacitors C11, C12, C21, C22, C31, and C32 are, for example, the leading power factor capacitors used in high voltage equipment such as the power equipment in FIG. 1. When the circuit breaker S is controlled to the off state, the power of the capacitor C, which is a leading power factor capacitor, is cut off. When the circuit breaker S is controlled to the on state, the power of the capacitor C is turned on.

[0023] In the following description, the operating state in which the connection path is opened by the circuit breaker is described as single bus operation, and the operating state in which the connection path is connected by the circuit breaker is described as bus connection operation. Single bus operation is, for example, a state in which the conduction between the bus 202A and the bus 202B is cut off by opening either one of the circuit breakers S15 and S16. Bus connection operation is, for example, a state in which the conduction between the bus 202A and the bus 202B is ensured by closing both of the circuit breakers S15 and S16.

[0024] Figure 2 is a block diagram showing an example of a power factor adjustment device 100 in an embodiment. The power factor adjustment device 100 includes, for example, a reactive power calculation unit 110 and a control unit 120. The reactive power calculation unit 110 and the control unit 120 are realized, for example, by a processor such as a CPU (Central Processing Unit) executing a program stored in program memory. Furthermore, some or all of the reactive power calculation unit 110 and the control unit 120 may be realized by hardware such as an LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), or FPGA (Field-Programmable Gate Array), or they may be realized by the cooperation of software and hardware.

[0025] The reactive power calculation unit 110 calculates the reactive power for each of the multiple busbars 202. The reactive power calculation unit 110 calculates the reactive power for the receiving current I of busbar 202A. D and the busbar connection current I of busbar 202A A and busbar connecting current I C The difference between this and is calculated as the current consumed by busbar 202A. The reactive power calculation unit 110 calculates the current consumed by busbar 202A and the busbar voltage V of busbar 202A. A , and the current consumed by busbar 202A and busbar voltage V A The reactive power Q in busbar 202A is due to the phase difference. A The reactive power calculation unit 110 calculates the received current I of busbar 202B. E and the busbar connection current I of busbar 202B B and busbar connecting current I A The difference between these two values ​​is calculated as the current consumed by busbar 202B. The reactive power calculation unit 110 calculates the current consumed by busbar 202B and the busbar voltage V of busbar 202B. B , and the current consumed by busbar 202B and busbar voltage V B The reactive power Q in busbar 202B is due to the phase difference. B The reactive power calculation unit 110 calculates the received current I of the busbar 202C. Fand the busbar connection current I of busbar 202C C and busbar connecting current I B The difference is calculated as the current consumed by busbar 202C. The reactive power calculation unit 110 calculates the current consumed by busbar 202C and the busbar voltage V of busbar 202C. C , and the current consumed by busbar 202C and busbar voltage V C The reactive power Q in busbar 202C is due to the phase difference. C Calculate.

[0026] The power factor adjustment device 100 may determine reactive power from the power supplied from the power supply equipment (apparent power) and the power consumed by the load (active power). Furthermore, the power factor adjustment device 100 may acquire a signal showing the waveform of the received current and the bus voltage, and determine whether the waveforms of the received current and the bus voltage lead or lag to obtain the phase difference between the current consumed by each bus and the bus voltage.

[0027] The control unit 120 acquires, for example, a busbar connection signal indicating busbar independent operation or busbar connection operation. The control unit 120 also controls the closing or opening of one or more capacitors C by outputting a capacitor control signal that controls the circuit breaker S. The control unit 120 can control the amount of capacitor C closed for each busbar 202, or the amount of capacitor C closed for multiple busbars 202, by selectively closing multiple capacitors C. The amount of capacitor C closed is the sum of the capacitances of the closed capacitors C.

[0028] In busbar-only operation, the control unit 120 controls the switching on or off of capacitor C connected to each busbar 202 based on the reactive power in each busbar 202. Specifically, the control unit 120 controls the reactive power Q in busbar 202A. A Based on this, the control unit 120 controls the switching on or off of capacitors C11 and C12 connected to busbar 202A. The control unit 120 controls the reactive power Q in busbar 202B. B Based on this, the control unit 120 controls the switching on or off of capacitors C21 and C22 connected to busbar 202B. The control unit 120 controls the reactive power Q in busbar 202C. CBased on this, the switching on or off of capacitors C31 and C32 connected to busbar 202C is controlled.

[0029] In busbar-connected operation, the control unit 120 controls the switching on or off of capacitors C connected to each busbar 202 based on the reactive power of each busbar 202, and also controls the switching on or off of multiple capacitors C connected to multiple busbars 202 connected by circuit breakers S based on the reactive power calculated using the reactive power of multiple busbars 202 connected by circuit breakers S.

[0030] Figure 3 is a flowchart showing an example of the operation procedure of the power factor adjustment device 100 in the embodiment. First, the reactive power calculation unit 110 calculates the busbar connection current I A , I B , I C , receiving current I D , I E , and I F Busbar voltage V A , V B and V C Signals indicating each of these are input (step S100). The reactive power calculation unit 110 calculates the reactive power Q based on the signals input in step S100. A Q B , and Q C Calculate (Step S102).

[0031] Next, the control unit 120 determines whether or not it is busbar linked operation based on the busbar linkage signal (step S104). If there are multiple combinations of busbars 202, the control unit 120 determines whether or not it is busbar linked operation for each combination of busbars 202. If it is not busbar linked operation but busbar single operation (step S104: NO), the control unit 120 adjusts the power factor for each busbar 202 based on the reactive power of each busbar 202 (step S106). This allows the control unit 120 to control the capacitor C connected to each busbar 202 based on the reactive power calculated for each busbar 202.

[0032] In the case of busbar-connected operation (step S104: YES), the control unit 120 adjusts the power factor for each busbar 202 based on the reactive power of each busbar 202 (step S108), and adjusts the power factor of the multiple connected busbars 202 based on the reactive power of the multiple connected busbars 202 (step S110). As a result, the control unit 120 can control the capacitor C connected to each busbar 202 based on the reactive power calculated for each busbar 202, and then control the capacitor C connected to the multiple busbars 202 based on the reactive power calculated by treating the multiple busbars 202 as one.

[0033] Figure 4 is a block diagram illustrating an example of the operation of a power system in busbar-only operation according to the embodiment. For example, suppose that power from power supply equipment A is supplied to load A by controlling circuit breakers S1 and S11 to the closed state, and power from power supply equipment B is supplied to load B by controlling circuit breakers S2 and S21 to the closed state. Before power factor adjustment, suppose that at least one of circuit breakers S15 and S16 is open, and furthermore, circuit breakers S12 and S13 corresponding to capacitors C11 and C12 connected to busbar 202A, and circuit breakers S22 and S23 corresponding to capacitors C21 and C22 connected to busbar 202B are open.

[0034] When adjusting the power factor, the control unit 120 determines, based on the busbar connection signal, that busbars 202A and 202B are operating independently. For example, if the capacitances of capacitors C11 and C12 are each 500 kVar, the target power factor is 1, and the reactive power Q of busbar 202A is... A If the capacitance is lower than 1000kVar but greater than or equal to 500kVar, the control unit 120 controls the circuit breaker S corresponding to either capacitor C11 or C12 to the closed state. The control unit 120 can supply power to capacitor C11 by, for example, controlling the circuit breaker S12 to the closed state. The control unit 120 can, for example, assume that the capacitances of capacitors C21 and C22 are each 500kVar, the target power factor is 1, and the reactive power Q of busbar 202B. BIf the current is lower than 1000kVar but greater than or equal to 500kVar, the circuit breaker S corresponding to one of the capacitors C22 and C23 is controlled to the closed state. The control unit 120 can supply power to capacitor C21 by, for example, controlling the circuit breaker S22 to the closed state.

[0035] Figure 5 is a block diagram illustrating an example of the operation of a power system in busbar connection operation according to the embodiment. For example, suppose that power from power supply equipment A is supplied to load A by controlling circuit breakers S1 and S11 to be closed, and power from power supply equipment B is supplied to load B by controlling circuit breakers S2 and S21 to be closed. Before power factor adjustment, suppose that circuit breakers S15 and S16 are closed, and furthermore, circuit breakers S12 and S13 corresponding to capacitors C11 and C12 connected to busbar 202A, and circuit breakers S22 and S23 corresponding to capacitors C21 and C22 connected to busbar 202B are open.

[0036] The control unit 120 determines, based on the busbar connection signal, that busbars 202A and 202B are connected in busbar connection operation. For example, the control unit 120 determines that the capacitances of capacitors C11, C12, C21, and C22 are each 500 kVar, the target power factor is 1, and the reactive power Q of busbar 202A. A The reactive power Q of busbar 202B is 800kVar. B When the current is 700kVar, circuit breaker S12 corresponding to capacitor C11 and circuit breaker S22 corresponding to capacitor C21 are controlled to the closed state. When capacitor C11 is closed, the reactive power Q of busbar 202A A The voltage decreases to 300kVar, and the reactive power Q of busbar 202B is reduced when capacitor C21 is switched on. AThis is reduced to 200kVar. Next, the control unit 120 controls the circuit breaker S13 corresponding to capacitor C12 to the closed state in order to reduce the reactive power of 500kVar, which is the sum of the reactive power of 300kVar in busbar 202A and the reactive power of 200kVar in busbar 202B connected by the connecting path 204A. In this way, the control unit 120 can reduce the reactive power of 500kVar, which is the sum of the reactive power of busbar 202A and the reactive power of busbar 202B, by the 500kVar capacity of capacitor C12.

[0037] The control unit 120 may prioritize switching on the capacitor C with the larger capacitance among the capacitors C connected to each bus 202 over the capacitor C with the smaller capacitance. For example, if the capacitance of capacitor C11 is greater than the capacitance of capacitor C12, the control unit 120 may consider the reactive power Q of bus 202A. A If the reactive power Q of busbar 202A is greater than the capacitance of capacitor C11, capacitor C11 is closed with priority over capacitor C12. The control unit 120, for example, when the capacitance of capacitor C11 is greater than the capacitance of capacitor C12, will close capacitor C11 over capacitor C12. A If the current is less than the capacitance of capacitor C11 and greater than the capacitance of capacitor C12, capacitor C12 is switched on. This allows the control unit 120 to switch on the appropriate capacitor C according to the reactive power of busbar 202.

[0038] The control unit 120 may prioritize closing the capacitor C connected to the bus 202 with the larger reactive power calculated by the reactive power calculation unit 110, over the capacitor C connected to the bus 202 with the smaller reactive power calculated by the reactive power calculation unit 110. In busbar connection operation, the control unit 120 closes the capacitor C connected to each bus 202 based on the reactive power of each bus 202, then compares the reactive power of the connected buses 202 and controls the circuit breaker S corresponding to the capacitor C connected to the bus 202 with the larger reactive power to the closed state. For example, to reduce the reactive power of 500kVar, which is the sum of the 300kVar reactive power of bus 202A and the 200kVar reactive power of bus 202B connected by the connecting path 204A, the control unit 120 prioritizes closing the capacitor C of bus 202A over the capacitor C of bus 202B. This allows the control unit 120 to prioritize reducing the reactive power of bus 202A.

[0039] As described above, according to the power factor adjustment device 100 of the embodiment, the control unit 120 controls the switching on or off of capacitors C connected to each bus 202 based on the reactive power of each bus 202 calculated by the reactive power calculation unit 110 when a bus is operating alone with the connecting path 204 open by the circuit breaker S; when a bus is operating in a connected configuration with multiple buses 202 connected by the circuit breaker S, the control unit 120 controls the switching on or off of capacitors C connected to each bus 202 based on the reactive power of each bus 202 calculated by the reactive power calculation unit 110; and controls the switching on or off of multiple capacitors C connected to multiple buses 202 connected by the circuit breaker S based on the reactive power calculated using the reactive power of multiple buses 202 connected by the circuit breaker S calculated by the reactive power calculation unit 110. As a result, according to the power factor adjustment device 100 of the embodiment, the power factor can be efficiently improved according to the operating conditions.

[0040] For example, when the operating state is busbar-connected operation, if the capacitor C connected to each busbar 202 is not controlled based on the reactive power calculated for each busbar 202, but rather the capacitor C connected to multiple busbars 202 is switched on based on the reactive power calculated by treating multiple busbars 202 as one, then the reactive power of each busbar 202 and the amount of capacitor C switched on are not correlated, which may result in insufficient power factor improvement for each busbar 202 when switching to busbar-only operation. In contrast, with the power factor adjustment device 100 of the embodiment, when the operating state is busbar-connected operation, the capacitor C can first be controlled based on the reactive power of each busbar 202, and then the capacitor C can be controlled based on the reactive power of multiple busbars 202, thus avoiding insufficient power factor improvement.

[0041] Although various embodiments and variations have been described, these are merely examples and are not limited to these. For example, one embodiment or variation, or a part of one embodiment or variation, may be combined with one or more other embodiments or variations to realize one aspect of the present invention. [Explanation of Symbols]

[0042] 100...Power factor adjustment device, 110...Reactive power calculation unit, 120...Control unit, 200, 200A, 200B, 200C, 200D, 200E, 200F...Current detectors, 202, 202A, 202B, 202C...Bus lines, 204, 204A, 204B, 204C...Connecting lines

Claims

1. A power factor adjustment device for adjusting the power factor of a power system comprising: a plurality of transformers for transforming the received power; a plurality of busbars connected to each of the plurality of transformers; one or more capacitors connected to each of the plurality of busbars; a connecting path connecting the plurality of busbars; and a circuit breaker for closing or opening the connecting path, A reactive power calculation unit calculates the reactive power for each of the multiple busbars and uses the reactive power of the multiple busbars to calculate the total reactive power, The system comprises a control unit that controls the switching on or off of one or more capacitors, The control unit, When the circuit breaker opens the connecting path, the system controls the switching on or off of the capacitors connected to each bus based on the reactive power of each bus calculated by the reactive power calculation unit. A power factor adjustment device that, when multiple buses are connected by the circuit breaker, performs a first control to control the switching on or switching off of the capacitors connected to each bus based on the reactive power of each bus calculated by the reactive power calculation unit, and performs a second control to control the switching on or switching off of the multiple capacitors connected to the multiple buses connected by the circuit breaker based on the reactive power calculated using the reactive power of the multiple buses connected by the circuit breaker after the first control.

2. The power factor adjustment device according to claim 1, wherein the control unit prioritizes switching on the capacitor with a larger capacitance among the capacitors connected to each busbar over the capacitor with a smaller capacitance.

3. The power factor adjustment device according to claim 1, wherein the control unit preferentially switches on the capacitor connected to the bus with a large reactive power calculated by the reactive power calculation unit, among a plurality of buses, compared to the capacitor connected to the bus with a small reactive power calculated by the reactive power calculation unit.

4. A power factor adjustment method for adjusting the power factor of a power facility comprising: a plurality of transformers for transforming the received power; a plurality of busbars connected to each of the plurality of transformers; one or more capacitors connected to each of the plurality of busbars; a connecting path connecting the plurality of busbars; and a circuit breaker for closing or opening the connecting path, The step of determining whether the connecting path is open or connected by the circuit breaker, If the circuit breaker determines that the connecting path is open, The reactive power for each of the aforementioned busbars is calculated, The steps include: turning on or off the capacitors connected to each bus based on the calculated reactive power of each bus; If the circuit breaker determines that multiple busbars are connected, The reactive power for each of the aforementioned busbars is calculated, A first control step of turning on or off the capacitors connected to each bus based on the calculated reactive power of each bus, After the first control, the reactive power of the multiple buses connected by the circuit breaker is calculated, A second step of performing a second control, which involves switching on or off multiple capacitors connected to multiple buses that are connected by the circuit breaker, based on the reactive power calculated using the reactive power of multiple buses, A power factor adjustment method, including

5. A power factor adjustment device computer adjusts the power factor of a power facility comprising: a plurality of transformers for transforming the received power; a plurality of busbars connected to each of the plurality of transformers; one or more capacitors connected to each of the plurality of busbars; a connecting path connecting the plurality of busbars; and a circuit breaker for closing or opening the connecting path. The step of causing the circuit breaker to determine whether the connecting path is open or connected, If the circuit breaker determines that the connecting path is open, The reactive power for each of the aforementioned multiple busbars is calculated, The steps include: turning on or off the capacitors connected to each bus based on the calculated reactive power of each bus; If the circuit breaker determines that multiple busbars are connected, The reactive power for each of the aforementioned multiple busbars is calculated, A first step of performing control to turn on or off the capacitors connected to each bus based on the calculated reactive power of each bus, After the first control, the reactive power of the multiple buses connected by the circuit breaker is calculated. A second step of performing a second control to turn on or off multiple capacitors connected to multiple buses that are connected by the circuit breaker, based on the reactive power calculated using the reactive power of multiple buses, A program that executes something.

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