JP2013240145A - Self-sustained operation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-sustained operation device capable of maintaining the voltage in a system properly, without installing an extra voltage regulator.SOLUTION: The self-sustained operation device includes an operation mode switching device MD1 which determines a self-sustained operation mode or a normal operation mode corresponding to normal time in the power distribution section of a power distribution system, a main power supply device MP1 which supplies power to a power customer connected with the power distribution system, by supplying power while determining the system voltage and frequency to the power distribution section in the self-sustained operation mode, an automatic power factor regulator PG1 starting in the self-sustained operation mode, a power capacitor PA1 and a shunt reactor SR1 controlled by the automatic power factor regulator PG1, an operation mode switching device MD2 provided in the power customer and determining the self-sustained operation mode or a normal operation mode in the power distribution section, a second automatic power factor regulator PG2 which switches the control in the self-sustained operation mode and normal operation mode, and a power capacitor PA2 controlled by the automatic power factor regulator PG2.

Description

  The present invention relates to a self-sustained operation device, and more particularly, to a self-sustained operation device that enables a self-sustained operation by electrically disconnecting a terminal-side distribution line when a system fault occurs in a power distribution system.

  In the event of a disaster such as a major earthquake or typhoon, long-term grid failures may occur in the power distribution system. In this case, a power failure continues in the distribution line on the terminal side (downstream side) from the accident occurrence location. As a countermeasure against the disaster, an independent operation system in which power is supplied by a main power supply device such as a storage battery is attracting attention as an independent system in which a terminal-side distribution line is electrically disconnected.

  However, when the distance of the independent operation system is a relatively wide range of several kilometers, the system voltage is affected by the influence of the current flowing in the system and the distribution line impedance as the distance from the main power supply that determines the system voltage and frequency increases. Goes up or down. Therefore, it is a problem whether to suppress an increase or decrease in voltage and maintain an appropriate voltage over the entire autonomous operation system.

  It is important to suppress the voltage fluctuation of the distribution line not only at the time of a disaster. For example, in Patent Document 1, the voltage deviation (difference between the target voltage and the estimated voltage), the integration amount, the dead zone, and the operation time are controlled parameters (setting values). Adopted as.

  In other words, when the control target voltage of the voltage regulator is different from the voltage estimation result, it is considered that a slight voltage difference is acceptable in the operation of the distribution system, and excessive control of the voltage regulator shortens the device life. Therefore, in order to allow a slight voltage difference, the dead zone where the control target voltage can be considered in the range instead of the point, and the voltage deviation integral amount that makes the voltage control execution judgment with the total amount of time of the voltage difference as the set value Adopted.

  In addition, if there is an instantaneous voltage deviation due to a steep load change, the voltage deviation may be resolved naturally in a short time, and if voltage adjustment is performed following the instantaneous voltage deviation, excessive (or wasted) It may be a control. Therefore, the operation time until the voltage control operation is adopted as a set value.

Japanese Patent No. 4002190

  In a self-sustained operation system that can electrically isolate a part of the power distribution system in the event of a power failure and can be self-sufficient in power mainly from a main power supply device such as a storage battery, there is no voltage regulator that maintains the voltage in the system properly In such a case, there is a problem that the voltage increases or decreases as the distance from the main power supply device increases and deviates from the appropriate voltage.

  However, voltage regulators are generally expensive, large in weight and volume, and difficult to install in each power distribution system that can operate independently.

  The present invention was made to solve the above-described problems, and provides a self-sustained operation device that can properly maintain the voltage in the system without additionally installing a voltage regulator. Objective.

  The mode of the self-sustained operation device according to the present invention is such that, in normal times, when the adjacent distribution system is electrically connected to the adjacent distribution system and receives power supply, the adjacent predetermined distribution system A self-sustained operation device that is connected to a power distribution system that is electrically disconnected from the power distribution system and controls the predetermined power distribution system as a self-sustained operation system when the adjacent power distribution system fails. A first operation mode switching device for determining whether the distribution section of the distribution system is set to a self-sustaining operation mode corresponding to a case where the adjacent distribution system fails or a normal operation mode corresponding to a normal operation; In the self-sustaining operation mode, the predetermined power distribution system is configured to supply power while determining a system voltage and a frequency in the power distribution section based on the determination in the operation mode switching device 1. Input and release are controlled by a main power supply device that supplies power to a connected power consumer, a first automatic power factor regulator that is activated in the self-sustaining operation mode, and the first automatic power factor regulator. A first phase-advancing capacitor and a shunt reactor, and a second operation mode switch that is provided in the electric power consumer and determines whether the power distribution section is set to the independent operation mode or the normal operation mode. And a second automatic power factor adjuster that switches control between the self-sustained operation mode and the normal operation mode based on the determination made by the device, the second operation mode switching device, and the second automatic power factor adjustment. And a second phase-advancing capacitor that is controlled to be turned on and off by a container.

  According to the self-sustained operation apparatus according to the present invention, it is possible to appropriately maintain the system voltage during the self-sustained operation in the distribution section in charge without additionally installing a costly expensive voltage regulator.

It is a block diagram which shows the structure of the independent operation apparatus of embodiment which concerns on this invention. It is a block diagram which shows the structure of the operation mode switching apparatus which comprises the self-supporting operation apparatus of embodiment which concerns on this invention. It is a flowchart explaining operation | movement of the operation mode switching apparatus which comprises the self-supporting operation apparatus of embodiment which concerns on this invention. It is a block diagram which shows the structure of the automatic power factor regulator of the consumer which comprises the self-sustained operation apparatus of embodiment which concerns on this invention. It is a flowchart explaining operation | movement of the automatic power factor regulator of the consumer which comprises the self-sustained operation apparatus of embodiment which concerns on this invention. It is a block diagram which shows the structure of the automatic power factor regulator of the disaster prevention center which comprises the self-sustained operation apparatus of embodiment which concerns on this invention. It is a flowchart explaining operation | movement of the automatic power factor regulator of the disaster prevention center which comprises the self-sustained operation apparatus of embodiment which concerns on this invention. It is a figure which illustrates voltage control by SVR typically. It is a figure which illustrates voltage control by a LDC system typically. It is a figure explaining the problem of the independent operation in a power distribution system.

<Introduction>
Prior to the description of the embodiments according to the present invention, the operation of an SVR (Step Voltage Regulator) which is a typical voltage regulator in the distribution system will be described.

  FIG. 8 is a diagram for schematically explaining the voltage control by SVR. FIG. 8A shows a configuration in which SVR 101 is installed in the middle of the distribution line, and shows the power from distribution substation DPS. Is provided to the distribution system DB via the circuit breaker BK, and the SVR 101 is inserted in the distribution system DB. In the distribution system DB, distribution switches SWD1 and SWD2 are interposed on the upstream side and the downstream side, respectively, so as to sandwich the SVR 101.

  In FIG. 8 (b), the horizontal axis represents the distance from the distribution substation, the vertical axis represents the voltage, and shows the state of voltage fluctuation depending on the distance from the distribution substation. This shows a state in which the voltage on the terminal side from the SVR 101 is maintained in an appropriate range by the SVR 101 pushing up the voltage gradually decreasing from the distribution substation DSP.

  The SVR 101 adopts a kind of transformer structure that changes the transformation ratio by tap switching and adjusts the secondary side (load side of the distribution system) voltage. As a typical control method, LDC (Line Drop Compensator: Line voltage drop) that controls to the appropriate tap position (ie, transformation ratio) by calculating the passing power (or passing current) of the SVR and the measured value of the secondary side voltage. Compensator) method and a schedule method for switching to a predetermined tap position at a predetermined time.

  FIG. 9 is a diagram for schematically explaining voltage control by the LDC method. FIG. 9A schematically shows the voltage compensation range VC by the SVR 101. In the LDC method, the voltage control range VC is shown by the SVR 101. Assume a voltage estimation point virtually called a “load center point” on the downstream side (terminal side). In FIG. 9 (b), the horizontal axis indicates the distance (km) from the SVR, and the vertical axis indicates the estimated voltage (V), indicating the state of voltage fluctuation depending on the distance from the SVR. .

  An assumption method of the load center point is as follows from the load capacity Ci (kW) of each load device installed in the voltage compensation range and the distance li (m) from the SVR (voltage regulator) to each load device. Using equation (1), the distance lg (m) to the center of gravity is obtained, and the point of distance lg from the voltage regulator is set as the load center point.

  The distance from the voltage regulator to the load center point and the impedance from the distribution line impedance information (line resistance R (Ω / m), reactance (Ω / m)) to the load center point The line resistance R (Ω) and the line reactance X (Ω) are obtained.

Further, the load center point voltage is equal to the terminal voltage of the voltage compensation range, and voltage control is performed so that the load center point voltage _VL is within the upper and lower limits of the operating voltage, as shown in part (b) of FIG.

Using the SVR self-passing effective power P (kW), reactive power Q (kVar), self-end voltage Vs (kV), and line resistance R (Ω) and line reactance X (Ω) from the SVR to the load center point Thus, the voltage V _L (kV) at the load center point away from the SVR is estimated from the following formula (2).

  In the above formula (2), the line resistance R and the line reactance X from the SVR to the load center point are preset constants, which are a so-called “settling value (control parameter)”.

  Here, in the configuration shown in part (a) of FIG. 8, a system failure occurs on the secondary side of the SVR 101, and the problem in the case where the autonomous operation is carried out only in the system on the terminal side from the accident location is shown in FIG. I will explain.

  In FIG. 10, a system fault occurs before the power distribution switch SWD2 on the secondary side of the SVR 101, and a transition is made between the power distribution switch SWD2 and the downstream power distribution switch SWD3 to stand-alone operation. Is shown.

  As shown in FIG. 10, the disaster prevention center DS exists in the self-sustained operation system, and power is supplied from the storage battery BT in the disaster prevention center DS to the power distribution system DB via the inverter IV. There is no voltage regulator, and there is a possibility that the voltage in the distribution system DB cannot be properly maintained.

  As one of the countermeasures, it is conceivable to arrange the SVR in each part of the distribution system that may be operated independently, but as described above, it is difficult to realize it in terms of cost.

<Embodiment>
<Device configuration>
Hereinafter, an embodiment of a self-sustained operation device according to the present invention will be described with reference to FIGS.

  FIG. 1 shows a distribution system DB composed of a distribution line DL and a customer CS including a power load LD that consumes power supplied via the distribution line DL, and a self-sustaining operation apparatus 100 in charge of the distribution system DB. It is a block diagram which shows the structure of these. The region sandwiched between the distribution switches SWD1 and SWD2 of the distribution line DL is the distribution section of the distribution system DB. There are two distribution systems, which are called adjacent distribution systems.

  As shown in FIG. 1, the self-sustained operation device 100 according to the embodiment includes a disaster prevention center DS having a main power supply device MP1, an automatic power factor adjuster PG2, a phase advance capacitor PA2 installed in a customer CS, and It is comprised by operation mode switching device MD2.

  The disaster prevention center DS includes a main power supply device MP1, a phase advance capacitor PA1, a shunt reactor SR1, an operation mode switching device MD1, and an automatic power factor adjuster PG1 as main components.

  As shown in FIG. 1, the phase advance capacitor PA1 and the shunt reactor SR1 are connected to the local system IL1 via the switch SW, respectively, and the local system IL1 is connected to the distribution line DL. A current / voltage meter CM1 is inserted, and the current and voltage waveforms measured by the current / voltmeter CM1 are provided to the automatic power factor adjuster PG1. The on-site system IL1 and the distribution line DL are connected at the connection point CP1.

  In addition, a main power supply device MP1 including a storage battery BT1 and an inverter IV1 is connected to the local system IL1.

  When the connected power distribution system is operating normally, the main power supply device MP1 is operated at a power factor of 100% in synchronization with the voltage / frequency of the connected distribution system. Operates in operation mode. On the other hand, when the power distribution system to be connected fails, it operates in a self-sustaining operation mode in which the system voltage and frequency are generated by itself and power is supplied to the power distribution section to be operated independently. In addition, although the example comprised by storage battery BT1 and inverter IV1 was shown in FIG. 1, electric power generation may be performed by a synchronous generator and may be performed by a fuel cell, and is not specifically limited.

  The operation mode switching device MD1 is connected to the wide area communication network NW, and is configured to receive information from the distribution system monitoring control system DBS provided in the sales office EPC of the electric power company via the wide area communication network NW. Based on the information from the system monitoring control system DBS, the automatic power factor adjuster PG1 is started / stopped and the control mode of the main power supply device MP1 is switched.

  The automatic power factor adjuster PG1 controls on / off of the switch SW connected to the phase advance capacitor PA1 and the shunt reactor SR1 based on the current and voltage waveforms measured by the current / voltmeter CM1. To adjust the power factor. However, during normal operation, the main power unit MP1 is stopped or is operating at a power factor of 100%, so the automatic power factor regulator PG1 is stopped, and the phase advance capacitor PA1 and the shunt reactor are stopped. SR1 is not controlled. When the operation mode switching device MD1 instructs the main power supply device MP1 to shift to the independent operation mode due to the occurrence of a power failure or the like, a start command is issued from the operation mode switching device MD1, and the automatic power The rate adjuster PG1 is activated.

  On the other hand, during the self-sustaining operation, the phase-advancing capacitor PA1 and the shunt reactor SR1 are turned on so as to improve the power factor at the interconnection point CP1, that is, cancel the reactive power burden applied to the inverter IV1 of the main power supply device MP1. The opening is determined, and the switch SW is turned on / off.

  One or more phase-advancing capacitors PA1 and shunt reactors SR1 are installed and connected to the local system IL1 via the switch SW.

  In the customer CS, the phase advance capacitor PA2 is connected to the local system IL2 via the switch SW, and the local system IL2 is connected to the distribution line DL. However, the current system and the voltmeter CM2 are connected to the local system IL2. The current and voltage waveforms measured by the current / voltmeter CM2 are supplied to the automatic power factor adjuster PG2. The on-site system IL2 and the distribution line DL are connected at the connection point CP2. In addition, a power load LD is connected to the local system IL2.

  The operation mode switching device MD2 is connected to the wide area communication network NW, and is configured to receive information from the distribution system monitoring and control system DBS provided in the power company sales office EPC and the like via the wide area communication network NW. Based on the information from the distribution system monitoring control system DBS, the control mode of the automatic power factor adjuster PG2 is switched.

  In the normal operation mode, the automatic power factor adjuster PG2 calculates the active power, reactive power, and power factor of the interconnection point CP2 based on the current and voltage waveforms measured by the current / voltmeter CM2, and is set in advance. The power factor is adjusted by determining whether the phase advance capacitor PA2 is turned on or off so that the target power factor approaches the target power factor, and controlling on / off of the switch SW. Further, in the self-sustained operation mode, the connection point voltage is calculated based on the voltage waveform measured by the current / voltmeter CM2, and the phase advance capacitor PA2 is turned on so that it is within a preset target voltage range. The opening is determined, and the switch SW is turned on / off.

  The phase advance capacitor PA2 is installed in one or a plurality of switches SW2 in order to cancel the reactive power component of the power load LD, which is a delay power factor, and improve the power factor at the interconnection point CP2 in the local system IL2. Is connected to the local system IL2. The phase advance capacitor PA2 is installed on the load side near the interconnection point CP2 as shown in FIG. 1, and is turned on or released according to the magnitude of the reactive power component of the power load LD.

  Here, the power factor discount system is applied to high-voltage customers who receive power directly from the high-voltage system of the distribution line, and the basic charge is reduced as the power factor at the interconnection point is improved from the delay to the forward direction and approaches 100%. ing. Therefore, many high-voltage customers often have a phase advance capacitor for improving the power factor at the interconnection point in the forward direction, and an automatic power factor regulator that controls the turning on and off of the phase advance capacitor. .

  A phase-advancing capacitor is a device that improves the power factor from delay to advance by releasing reactive power. This also changes the power factor of the distribution system in the advance direction, and has the effect of boosting the voltage of the distribution system. is there.

<Overall operation of self-sustained operation device>
When a power outage occurs in the power distribution system upstream of the power distribution system DB and the power outage reaches the adjacent power distribution system, the power distribution switches SWD1 and SWD2 that define the power distribution system DB are opened. It becomes electrically independent from the power distribution system.

  In this case, in the independent operation device 100, the operation mode switching devices MD1 and MD2 cooperate with the power company distribution system monitoring and control system EPC via the wide area network NW to acquire information on the power failure, and the independent operation device 100. It is determined whether the distribution section in charge of is set to normal operation or independent operation. And the operation mode of the automatic power factor regulators PG1 and PG2 respectively installed in the disaster prevention center DS and the customer CS is switched.

  In the operation mode switching devices MD1 and MD2, when a power failure occurs, the prediction of the power failure duration is acquired. For example, when the power failure is prolonged, the operation mode switching devices MD1 and MD2 determine the transition to the independent operation mode. The distribution section at this time is referred to as an “independent operation system”.

  In addition, based on the information acquired from the distribution system monitoring and control system EPC, when it is determined that the distribution system has recovered from the power failure and the autonomous operation system can be operated normally, the transition to the normal operation mode is performed. decide.

  Then, the operation mode switching device MD1 switches the control mode of the main power supply device MP1 based on the determination result, and the operation mode switching device MD2 switches the control mode of the automatic power factor adjuster PG2.

<Configuration of operation mode switching device>
The configuration of the operation mode switching device MD1 will be described with reference to FIG. As shown in FIG. 2, the operation mode switching device MD1 includes a wide area communication unit 1, an operation mode determination unit 2, and an operation mode transmission unit 3 as main components.

  The wide area communication unit 1 communicates with the power distribution system monitoring control system DBS (FIG. 1), and receives information on an expected time of power failure continuation and information on power failure recovery when a power failure occurs.

  The operation mode determination unit 2 is based on the information received from the distribution system monitoring control system DBS and the determination criterion for transition to independent operation that is set in advance and stored in the storage unit 4 (for example, the allowable duration of power outage). Then, it is determined whether the power distribution section in charge of the self-sustained operation device 100 is shifted from the normal operation to the self-sustained operation, or whether the self-sustained operation is shifted to the normal operation.

  Based on the determination by the operation mode determination unit 2, the operation mode transmission unit 3 transmits a control mode switching command to the main power supply device MP1 and a start / stop command to the automatic power factor adjuster PG1. Although the configuration is basically the same in the operation mode switching device MD2, the operation mode transmission unit 3 of the operation mode switching device MD2 transmits a control mode switching command to the automatic power factor adjuster PG2.

  The operation mode switching device MD1 (MD2) is realized by a personal computer or an industrial computer, and the wide area communication unit 1, the operation mode determination unit 2, the operation mode transmission unit 3, and the like are realized by a CPU.

<Operation of operation mode switching device>
Next, the operation of the operation mode switching device MD1 will be described using the flowchart shown in FIG. 3 with reference to FIG. Note that the operation mode switching device MD1 repeatedly performs the following operations at regular intervals such as a 1-second cycle.

  First, the presence / absence of reception information from the distribution system monitoring control system DBS (FIG. 1) is confirmed by the wide area communication unit 1 (step S1). If there is no reception, the operation is terminated and the reception information in the next cycle is waited for.

  On the other hand, when the information from the distribution system monitoring control system DBS is received, it is confirmed whether or not the current operation is in the normal operation mode (step S2). When it is in the mode, the process proceeds to step S6, and the operation mode determination unit 2 determines the mode.

  In step S3, it is confirmed whether or not the power distribution system to which the self-sustained operation device 100 is connected has a power outage and the expected power outage continuation time acquired from the power distribution system monitoring control system DBS is longer than a preset allowable time. (Step S3), if both are satisfied, the transition to the self-sustaining operation mode is determined (Step S4). If both are not satisfied, the operation is terminated.

  In step S6, based on the information acquired from the distribution system monitoring control system DBS, whether or not the adjacent distribution system of the distribution system to which the self-sustained operation device 100 is connected has already been restored and power can be received from there. If it is determined and power can be received from the adjacent distribution system, the shift to the normal operation mode is determined (step S7). The operation is terminated when it is impossible to receive power from the adjacent distribution system.

  When the mode shift is determined in steps S4 and S7, a control mode switching command is transmitted to the main power supply device MP1 via the operation mode transmission unit 3 (step S5). In operation mode switching device MD2, a control mode switching command is transmitted to automatic power factor adjuster PG2.

<Configuration of automatic power factor adjuster for customers>
Next, the configuration of the consumer automatic power factor adjuster PG2 will be described with reference to FIG. As shown in FIG. 4, the automatic power factor adjuster PG <b> 2 includes an effective value calculation unit 10, a comparison determination unit 20, a control execution unit 30, an operation mode reception unit 40, and a storage unit 50 as main components.

  The effective value calculation unit 10 calculates a power factor effective value at the connection point from the current and voltage waveform output from the current / voltmeter CM2, and calculates a voltage effective value at the connection point. And a voltage calculation unit 12.

  The comparison determination unit 20 determines whether or not the power factor at the interconnection point has deviated from a preset target power factor range, and if it deviates, the power factor for determining whether to advance or release the phase advance capacitor The comparison determination unit 21 and a voltage comparison determination unit that determines whether the voltage at the interconnection point has deviated from a preset target voltage range and, if deviated, determines whether the phase advance capacitor is turned on or off. 22. Although the target power factor range is stored in the storage unit 51 and the target voltage range is stored in the storage unit 52, the storage units 51 and 52 may be the same storage unit.

  The control execution unit 30 executes the control for turning on or off the phase-advancing capacitor determined by the comparison / determination unit 20, and also turns on and off the phase-advancing capacitor in the phase adjusting equipment DB (database) stored in the storage unit 50. Update status information.

  The operation mode receiving unit 40 receives an operation mode switching command from the operation mode switching device MD2.

  The storage unit 50 stores equipment information such as the number and capacity of phase advance capacitors, and a phase adjusting equipment DB that stores the input and release states of the phase advance capacitors.

<Operation of the customer's automatic power factor adjuster>
Next, the operation of the automatic power factor adjuster PG2 will be described using the flowchart shown in FIG. 5 with reference to FIG. Note that the automatic power factor adjuster PG2 repeatedly performs the following operations at regular intervals such as a 1-second cycle.

  First, the operation mode receiving unit 40 receives a signal from the operation mode switching device MD2, and determines whether the current operation mode is the normal operation mode or the independent operation mode (step S11). That is, if the latest signal from the operation mode switching device MD2 is a signal instructing switching to the independent operation mode, it is determined that the current mode is the autonomous operation mode, and the latest signal from the operation mode switching device MD2 is normal. If the signal is an instruction to switch to the operation mode, it is determined that the current operation mode is the normal operation mode.

  If it is determined in step S11 that the current mode is the normal operation mode, the power factor calculation unit 11 of the effective value calculation unit 10 determines the current at the connection point based on the current and voltage waveform output from the current / voltmeter CM2. A power factor effective value is calculated (step S12).

  Next, the power factor comparison / determination unit 21 of the comparison / determination unit 20 compares the target power factor range stored in the storage unit 51 with a power factor at the interconnection point that is later than the target power factor range. If this is the case (step S13), it is checked whether or not there is an uncharged phase-advancing capacitor (step S14). If there is an uncharged phase-advancing capacitor, the power factor at the interconnection point is the leading force. The control execution unit 30 is instructed to insert one phase-advancing capacitor that has not been charged so as to achieve a rate (step S15). If there is no phase-advancing capacitor that has not been turned on, the control execution unit 30 is not instructed and the operation is terminated.

  On the other hand, if the power factor at the interconnection point is the leading power factor (step S16), it is checked whether or not there is a phase advance capacitor that has been turned on (step S17). Is present, the control execution unit 30 is instructed to release one of the input phase advance capacitors so that the power factor at the interconnection point becomes the delay power factor (step S18). If the power factor at the connection point is delayed or not advanced, it is determined that the current state is maintained, the instruction to the control execution unit 30 is not issued, and the operation is terminated.

  If it is determined in step S11 that the current mode is the self-sustained operation mode, the voltage calculation unit 12 of the effective value calculation unit 10 determines the connection point based on the current and voltage waveform output from the current / voltmeter CM2. Is calculated (step S20).

  Next, in the voltage comparison / determination unit 22 of the comparison / determination unit 20, the voltage is compared with the target voltage range stored in the storage unit 52. When the voltage at the interconnection point is lower than the target voltage range (step S21), It is confirmed whether or not there is an uncharged phase advance capacitor (step S22). If there is an uncharged phase advance capacitor, the uncharged phase advance capacitor is set so that the voltage at the interconnection point is increased. An instruction is given to the control execution unit 30 so as to insert one (step S23). If there is no phase-advancing capacitor that has not been turned on, the control execution unit 30 is not instructed and the operation is terminated.

  On the other hand, when the voltage at the interconnection point is higher than the target voltage range (step S24), it is confirmed whether there is a phase advance capacitor that has been turned on (step S25). If present, the control execution unit 30 is instructed to release one of the input phase advance capacitors so that the voltage at the interconnection point is lowered (step S26). If there is no phase-advancing capacitor that has not been turned on, the control execution unit 30 is not instructed and the operation is terminated. When the voltage at the interconnection point is within the target voltage range, it is determined that the current state is maintained, and no instruction is given to the control execution unit 30.

  When the control execution unit 30 receives an instruction to turn on or open the phase advance capacitor, the control execution unit 30 executes on / off control of the switch SW of the phase advance capacitor (step S19) and is stored in the storage unit 50. The information on the on / off state of the phase advance capacitor in the phase adjusting equipment DB being updated is updated.

<Configuration of automatic power factor adjuster at Disaster Prevention Center>
Next, the configuration of the automatic power factor adjuster PG1 of the disaster prevention center will be described with reference to FIG. As shown in FIG. 6, the automatic power factor adjuster PG <b> 1 mainly includes a power factor calculation unit 60, a power factor comparison / determination unit 70, a control execution unit 80, and a storage unit 90.

  The automatic power factor adjuster PG1 does not start normally, and when the start command is received from the operation mode switching device MD1, that is, the operation mode switching device MD1 is independent from the main power supply device MP1 due to a power failure or the like. The power factor calculation unit 60 calculates the power factor effective value at the interconnection point from the current and voltage waveforms output from the current / voltmeter CM1.

  The power factor comparison / determination unit 70 determines whether or not the power factor at the interconnection point has deviated from a preset target power factor range, and if deviated, the phase advance capacitor and the shunt reactor are turned on or Decide on opening. The target power factor range is stored in the storage unit 91.

  The control execution unit 80 performs control of turning on or off the phase advance capacitor and the shunt reactor determined by the power factor comparison / determination unit 70, and the phase advance equipment DB of the phase adjusting equipment DB stored in the storage unit 90 and Update information on shunt reactor input and release.

<Operation of automatic power factor adjuster at Disaster Prevention Center>
Next, the operation of the automatic power factor adjuster PG1 will be described using the flowchart shown in FIG. 7 with reference to FIG. Note that the automatic power factor adjuster PG1 repeatedly performs the following operations at regular intervals such as a 1-second cycle.

  First, based on the current and voltage waveform output from the current / voltmeter CM1 in the power factor calculation unit 60, the power factor effective value at the interconnection point is calculated (step S31).

  Next, the power factor comparison / determination unit 70 compares the target power factor range stored in the storage unit 91, and if the power factor at the interconnection point is behind the target power factor range (step S32). ), Whether or not there is a shunt reactor that has already been put in (step S33), and if there is a shunt reactor that has been thrown in, the power factor at the interconnection point is advanced and becomes the power factor Then, the control execution unit 80 is instructed to release one of the thrown shunt reactors (step S34). If there is no shunt reactor that has been turned on, the process proceeds to step S39, where it is confirmed whether or not there is an uncharged phase advance capacitor. The control execution unit 80 is instructed to insert one unadvanced phase advance capacitor so that the power factor at the system point becomes the advance power factor (step S40). When there is no phase-advancing capacitor that has not been turned on, no instruction is issued to the control execution unit 80, and the operation is terminated.

  On the other hand, if the power factor at the interconnection point is the leading power factor (step S35), it is confirmed whether or not there is a phase advance capacitor that has been turned on (step S36), and the phase advance capacitor that has been turned on. Is present, the control execution unit 80 is instructed to release one of the input phase advance capacitors so that the power factor at the interconnection point becomes the delay power factor (step S37). If there is no phase-advancing capacitor that has already been turned on, the process proceeds to step S41, where it is checked whether or not there is an uncharged shunt reactor. The control execution unit 80 is instructed to insert one unreached shunt reactor so that the power factor at the system point becomes the delayed power factor (step S42). If the power factor at the connection point is delayed or not advanced, it is determined that the current state is maintained, the instruction to the control execution unit 80 is not issued, and the operation is terminated.

  When the control execution unit 80 receives an instruction to turn on or open the phase advance capacitor, or to turn on or open the shunt reactor, the control execution unit 80 executes on / off control of the switch SW of the phase advance capacitor and the shunt reactor. Along with (Step S38), the information on the on / off state of the phase advance capacitor of the phase adjusting equipment DB stored in the storage unit 90 is updated.

  As described above, in the independent operation device 100, the operation mode switching devices MD1 and MD2 acquire information on the power outage in cooperation with the power company distribution system monitoring and control system EPC via the wide area communication network NW. It is determined whether the power distribution section handled by the driving device 100 is set to normal operation or independent operation. When it is determined that the operation mode switching devices MD1 and MD2 are to be operated independently, the transition to the independent operation mode is determined, and the operation mode switching device MD1 switches the control mode of the main power supply device MP1 and operates. The mode switching device MD2 switches the control mode of the automatic power factor adjuster PG2.

  Then, the automatic power factor adjuster PG2 improves the power factor at the connection point in the normal operation mode by controlling the turning on and off of the phase advance capacitor PA2, and when the operation mode shifts to the self-sustaining operation mode, When the automatic power factor adjuster PG1 enters the start state in response to the start / stop control from the operation mode switching device MD, the turning on and off of the phase advance capacitor PA2 is controlled so as to adjust the voltage at The turning on and off of the phase advance capacitor PA1 and the shunt reactor SR1 are controlled so as to adjust the voltage at the interconnection point.

  Thereby, the reactive power burden of main power unit MP1 can be reduced, and the power capacity of main power unit MP1 can be reduced.

  Thus, in the self-sustained operation device according to the present invention, it is possible to properly maintain the system voltage during the self-sustaining operation in the distribution section in charge without additionally installing a voltage regulator, and to react to the reactive power burden of the main power supply device. Can be reduced.

  In addition, the operation mode can be appropriately switched by cooperation with the distribution system monitoring control system that monitors the power failure state and the recovery state over the entire distribution system.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  CP1, CP2 connection point, MD1, MD2 operation mode switching device, MP1 main power supply, PG1, PG2 automatic power factor regulator, PA1, PA2 phase advance capacitor, SR1 shunt reactor.

Claims (4)

In normal times, the power supply is connected to an adjacent distribution system and supplied with power, and when the adjacent distribution system fails, it is connected to a predetermined distribution system that is electrically disconnected from the adjacent distribution system. A self-sustained operation device that controls the predetermined power distribution system as a self-sustaining operation system when the adjacent power distribution system fails.
The self-sustaining operation device is:
A first operation mode switching device for determining whether the distribution section of the predetermined distribution system is set to a self-sustaining operation mode corresponding to a case where the adjacent distribution system fails or a normal operation mode corresponding to a normal operation; ,
Based on the determination in the first operation mode switching device, in the self-sustained operation mode, power is supplied to the power distribution section while determining the system voltage and frequency, so that the power demand connected to the predetermined power distribution system A main power supply for supplying power to the house;
A first automatic power factor regulator that starts in the self-sustaining operation mode;
A first phase advance capacitor and a shunt reactor controlled to be turned on and opened by the first automatic power factor regulator;
Provided in the electricity consumer,
A second operation mode switching device that determines whether the power distribution section is the independent operation mode or the normal operation mode;
A second automatic power factor adjuster that switches control between the self-sustaining operation mode and the normal operation mode based on the determination in the second operation mode switching device;
A self-sustained operation device comprising: a second phase advance capacitor that is controlled to be turned on and off by the second automatic power factor regulator. The first automatic power factor adjuster is:
In the self-sustained operation mode, the first phase advance capacitor and the shunt reactor are turned on and off so as to improve the power factor of the first interconnection point between the main power supply device and the predetermined power distribution system. Control
The second automatic power factor adjuster is:
In the normal operation mode, to control the turning on and off of the second phase advance capacitor so as to improve the power factor of the second interconnection point of the power consumer and the predetermined distribution system,
2. The self-sustained operation device according to claim 1, wherein in the self-sustained operation mode, turning on and off of the second phase advance capacitor is controlled so as to adjust a voltage at the second interconnection point. The first automatic power factor adjuster is:
In the self-sustained operation mode, the reactive power flowing out to the predetermined distribution system is absorbed by the second automatic power factor regulator being controlled to turn on and off the second phase advance capacitor, or the predetermined power distribution system 3. The self-sustained operation device according to claim 2, wherein the first phase advance capacitor and the shunt reactor are turned on and off so as to release reactive power. The first and second operation mode switching devices are
In cooperation with the distribution system monitoring and control system of an electric power company that supplies power to the predetermined distribution system, the estimated time of power outage continuation and recovery of power outage obtained from the distribution system monitoring and control system when a power outage occurs in the adjacent distribution system The self-sustained operation device according to claim 1, wherein the self-sustained operation device determines whether the power distribution section is set to the self-sustained operation mode or the normal operation mode based on information.

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