JP7226342B2 - Operation control system, operation control device and operation control method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an operation control system, an operation control device, and an operation control method for a distributed power source that suppresses reverse flow of electric power from the distributed power source to the grid.

Conventionally, in order to prevent reverse power flow when a distributed power supply system including solar power generation and storage batteries is connected to the grid and used, the amount of power at the power receiving point is measured directly, and the power amount at the power receiving point is measured. The power conditioner increases or decreases the output of the distributed power supply based on the patent document 1 (for example, Patent Document 1).

However, in the case of consumers who are connected to high-voltage commercial power, it is necessary to shut down the premises and install a power measurement device on the high-voltage wiring side, or equipment that can measure the power on the high-voltage side is required. Therefore, there were restrictions on the construction period and equipment to be prepared.
In addition, even if a commercially available protective relay is used in place of such a power measuring device, since only the binary state of whether the set value is exceeded or not is known, these protective relays prevent reverse power flow. not used for control.

By the way, when controlling to prevent reverse power flow to the system side of electric power by a distributed power supply using a protective relay, the signal output relay that indicates the binary state of whether or not the set value of the protective relay has been exceeded The challenge is to protect the lifespan of the number of contact operations.

Japanese Patent No. 3656556

The present invention has been made in view of the above problems, and its object is to prevent reverse power flow with a low-cost and simple configuration, and to operate the contact of a protective relay according to load fluctuations and power generation fluctuations. is to provide a technology that can suppress

The present invention for solving the above problems is
An operation control system for operating a distributed power supply connected to a commercial power system,
a forward power flow detection unit that operates to output a first detection signal when it is detected that a forward power flow at a power receiving point connected to the commercial power system is equal to or less than a predetermined value;
a reverse power detection unit that operates to output a second detection signal when reverse flow power is detected at the power receiving point;
A control unit connected to a power line that supplies power supplied from the commercial power system to a load and controls power supplied from the distributed power supply to the load, based on the input of the first detection signal a control unit that controls a control target value of power supplied to the load;
with
The control unit
Counting the number of times the first detection signal is input and storing it in a storage unit;
reducing or maintaining a control target value of power supplied to the load based on information related to the number of operations of the forward power flow detection unit;
characterized by

In an operation control system that connects to the commercial power grid and operates distributed power sources, in order to limit the reverse power flow to the commercial power grid, the system is activated when reverse power flow is detected at the power receiving point. 2 When a reverse power detector that outputs a detection signal is provided, a forward power flow detection unit that operates and outputs a first detection signal when it is detected that the forward power flow at the power receiving point is equal to or less than a predetermined value is also included. provided. Then, the control unit counts the number of times the first detection signal and the second detection signal are input and stores them in the storage unit, and based on information related to the number of operations of the forward power flow detection unit, the load is detected from the distributed power source. By reducing or maintaining the control target value of the power supplied to the commercial power system, reverse power flow to the commercial power system can be prevented. The forward power flow detector can be installed together with the installation work of the reverse power detector provided to limit the reverse power flow, so the installation work is less burdensome, and the forward power flow at the power receiving point is less than a predetermined value. Since expensive equipment is not required by using equipment with a simple configuration, which is a forward power flow detection unit that outputs a first detection signal when it is detected that it is detected, reverse power flow is prevented with a low cost and simple configuration. can. Furthermore, based on information related to the number of operations of the forward power flow detection unit (for example, the number of operations or the number of remaining operations), the control target value of the power supplied from the distributed power source to the load is reduced or maintained. Therefore, it is possible to suppress the contact operation of the protection relay in accordance with load fluctuations and fluctuations in the amount of power generation.

Moreover, in the present invention,
setting the allowable number of operations in a unit period according to information related to the number of operations of the forward power flow detection unit;
The information related to the number of times of operation may be the number of times of operation of the forward power flow detection unit or the number of times remaining after subtracting the number of times of input of the first detection signal counted in the unit period from the number of allowed operations. .

As a result, for example, in a consumer with little load fluctuation in the premises per week, it is possible to control the output target of the distributed power supply within the daily limit of the number of operations of the contact signal. The life of the contact signal of the protection relay is also ensured.

Moreover, in the present invention,
The control unit
A remainder between the number of inputs of the first detection signal counted at the end of the unit period and the allowable number of operations may be added to the allowable number of operations of the unit period continuing on the time series.

As a result, by turning the allowable number of times for the remainder to the next day, for example, for a customer whose regular load is reduced on weekends, the contacts of the protection relay do not operate on weekdays, and the contacts are collected together on Saturdays and Sundays. It becomes possible to act. It is possible to finely control the output of distributed power sources when the load is light.

Moreover, in the present invention,
The control unit
When the count value of the number of times the first detection signal or the second detection signal is input exceeds a predetermined threshold, a control operation start period for reducing or maintaining the control target value of the power supplied to the load. may be made relatively longer.

In this way, when the total number of operations of the protection relay exceeds a predetermined value, the start time of the control operation can be extended, so that the ON/OFF operation of the contact signal of the protection relay can be suppressed.

Moreover, in the present invention,
The control unit
A rate of change in a control operation that reduces or maintains a control target value of power supplied to the load when a count value of the number of times the first detection signal or the second detection signal is input exceeds a predetermined threshold. may be relatively lowered.

In this way, when the total number of operations of the protection relay exceeds a predetermined value, the rate of change of the power output generated by the distributed power source can be relatively decreased. The frequency of ON/OFF operation of the contact signal of the protective relay can be suppressed.

Moreover, in the present invention,
The control unit
When the count value of the number of times the first detection signal or the second detection signal is input exceeds a predetermined threshold, the power consumption amount of the load estimated based on the fluctuation pattern of the power supplied to the load. Depending on the magnitude, the control target value of the electric power supplied to the load may be decreased, or the change speed of the holding control operation may be increased or decreased.

In this way, when the load is estimated to be large, the output change is made fast until just before the estimated load amount, and when the load and the amount of power generated by the distributed power supply are approaching, the output change Since the speed can be slowed down, the ON/OFF operation of the contact signal of the protective relay can be suppressed.

Moreover, in the present invention,
The control unit
When the count value of the number of inputs of the first detection signal or the second detection signal exceeds a predetermined threshold value, the load is detected based on the history of the number of inputs of the first detection signal or the second detection signal. The control target value of the power to be supplied may be decreased, or the change speed of the holding control operation may be relatively decreased.

In this way, when the number of ON/OFF operations in the most recent predetermined period (for example, one week) transitions at a number of operations exceeding a predetermined threshold value, the speed of output change can be switched to a low speed. The ON/OFF operation of the contact signal of the protection relay can be suppressed according to the load fluctuation of the consumer and the fluctuation of the power generation amount of the distributed power supply.

In addition, the present invention
An operation control device for operating a distributed power supply connected to a commercial power system,
a control unit connected to a power line that supplies power supplied from the commercial power system to a load and controlling power supplied from a distributed power supply to the load, the power receiving point being connected to the commercial power system; A forward power flow at a power receiving point connected to the commercial power system output by operation of an underpower relay provided between a high-voltage power receiving facility that receives power supplied from the commercial power system is equal to or less than a predetermined value. a control unit that controls the control target value of the power supplied to the load based on the input of the first detection signal indicating that
with
The control unit
Counting the number of times the first detection signal is input and storing it in a storage unit;
reducing or maintaining a control target value of power supplied to the load based on information related to the number of times the underpower relay operates;
characterized by

According to the present invention, the control unit of the operation control device that controls the operation of the distributed power supply is provided between the power receiving point connected to the commercial power system and the high-voltage power receiving equipment that receives power supplied from the commercial power system. counting the number of first detection signal inputs indicating that the forward power flow at the power receiving point connected to the commercial power system is equal to or less than a predetermined value output by the operation of the power shortage relay, and storing the first detection signal in a storage unit; A control target value of power supplied to the load can be decreased or maintained based on information relating to the number of times the power relay has been activated. As a result, by using equipment with a simple configuration that outputs the first detection signal when it is detected that the forward power flow at the power point is equal to or less than a predetermined value, power is supplied to the load without requiring expensive equipment. Since it is possible to reduce or maintain the control target value of the power supplied, reverse power flow can be prevented with a low-cost and simple configuration. Further, reducing or maintaining the control target value of the power supplied from the distributed power source to the load based on information indicating the number of times the forward power flow detector operates (for example, the number of times of operation or the number of remaining operations). Therefore, it is possible to suppress the contact operation of the protective relay according to load fluctuations and fluctuations in the amount of power generation. In this case, although the undervoltage relay and the reverse current relay are installed in the high-voltage power system, it goes without saying that the same effect can be obtained even if they are installed in the wiring of the low-voltage interconnection.

In addition, the present invention
An operation control method for operating a distributed power supply connected to a commercial power system,
Connected to the commercial power system, output by operation of an underpower relay provided between a power receiving point connected to the commercial power system and a high-voltage power receiving facility that receives power supplied from the commercial power system. counting and storing the number of inputs of the first detection signal indicating that the forward power flow at the power receiving point is equal to or less than a predetermined value;
Based on the information related to the number of operations of the underpower relay, triggered by the input of the first detection signal, from the distributed power supply to the power line that supplies the power supplied from the commercial power system to the load. reducing or maintaining a control target value of power supplied to the load;
characterized by comprising

According to the present invention, when it is detected that the forward power flow at the power receiving point connected to the commercial power system is equal to or less than a predetermined value when controlling the operation of the distributed power supply, the number of times the first detection signal is input is counted. Decrease or maintain the control target value of the power supplied from the distributed power source to the load with respect to the power line supplying power to the load, based on the counted and stored information related to the number of times the underpower relay operates. can do. As a result, by using equipment with a simple configuration that outputs the first detection signal when it is detected that the forward power flow at the power point is equal to or less than a predetermined value, expensive equipment is not required. Reverse power flow can be prevented with a simple configuration. Furthermore, based on the number of operations or the number of remaining operations of the forward power flow detection unit, it is possible to reduce or maintain the control target value of the power supplied from the distributed power source to the load, so that the load fluctuation and the power generation amount can be reduced. It becomes possible to suppress the contact operation of the protection relay in accordance with the variation of .
In addition, according to the present invention, the first detection signal and the second detection signal are a combination of a smooth flow and a reverse power flow, but as a combination having a binary detection threshold between reverse power flows or between forward power flows also has the same effect. Furthermore, the control target value of the power supplied to the load may be the control target value of the power supplied from the distributed power sources to the commercial power, or the upper limit value of the power supplied from the distributed power sources to the commercial power. Similar effects can be obtained in this case as well.

Advantageous Effects of Invention According to the present invention, it is possible to provide a technology capable of preventing reverse power flow with a low-cost and simple configuration and suppressing the contact operation of a protective relay in accordance with load fluctuations and power generation fluctuations.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows schematic structure of the operation control system in Example 1 of this invention. It is a flowchart which shows the processing procedure of the operation control method in Example 1 of this invention. It is a timing chart which shows an example of the operation control method in Example 1 of this invention. 5 is a flowchart showing an example of contact operation suppression processing according to the first embodiment of the present invention. FIG. 9 is a flowchart showing another example of contact operation suppression processing according to the first embodiment of the present invention; FIG. It is a block diagram which shows schematic structure of the operation control system in Example 2 of this invention.

[Example of application]
Hereinafter, application examples of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram including an operation control system 1 according to an application example of the present invention. FIG. 1 shows a schematic configuration of a system in the customer premises connected to a high-voltage commercial power system 2 via a power receiving point Rp.

Loads 5 and 6 are connected to a single-phase three-wire power line through a high-voltage power receiving facility 3 and a distribution board 4 . A power conditioner 10 that controls the output of the photovoltaic module 20 and supplies power to the power line 9 is connected to the power line 9 .
A reverse power relay 7 and an underpower relay 8 are provided between the high voltage power receiving equipment 3 and the power receiving point Rp. The reverse power relay 7 and the power shortage relay 8 constitute protection relays in the operation control system 1 . The reverse power relay 7 outputs a detection signal when the power flowing backward to the commercial power system 2 exceeds a threshold (RPR detection level), and the power shortage relay 8 supplies the load on the consumer side from the commercial power system. When the applied forward power flow falls below the threshold (UPR detection level), it outputs a detection signal. Detection signals from the reverse power relay 7 and the power shortage relay 8 are input to the power conditioner 10 .

The operation control system 1 includes the power conditioner 10 described above, the reverse power relay 7 and the power shortage relay 8 . FIG. 2 is a flow chart showing the processing procedure of the operation control method in the operation control system 1, and FIG. 3 is a timing chart showing an example of the operation control method.
When the power conditioner 10 receives a detection signal from the underpower relay 8 while increasing the output control target value (time t2), the power conditioner 10 stops increasing the output control target value and increases the output control target value. After being held for a predetermined time D2, it is decreased (time t3). Then, when the detection signal from the underpower relay 8 is released (time t4), the power conditioner 10 stops decreasing the output control target value and holds the output control target value for a predetermined time D3. If the detection signal of the power shortage relay 8 is not input while the output control target value is held, the power conditioner 10 increases the output control target value.
Further, when the detection signal of the reverse power relay 7 is input, the power conditioner 10 performs gate block processing and stops the supply of power to the power line 9 regardless of the process of the operation control described above.

When connecting to a high-voltage commercial power system, installation of high-voltage power receiving equipment 3 is required. When the reverse power flow to the commercial power system is restricted, a reverse power relay 7 for detecting reverse power flow may be provided between the high voltage power receiving equipment 3 and the power receiving point Rp. In this application example, operation control of the photovoltaic power generation module 20 is performed using the underpower relay 8 that can be installed together with the reverse power relay 7 . Therefore, when the reverse power relay 7 is already installed, it is sufficient to install the underpower relay 8, so the installation work load is small. In addition, since expensive equipment is not required by using equipment with a simple configuration such as the underpower relay 8 that outputs a detection signal when it is detected that the forward power flow at the power receiving point is equal to or less than a predetermined value, the cost is low. In addition, reverse power flow can be prevented with a simple configuration.

FIG. 4 is a flowchart showing an example of contact operation suppression processing in the operation control system 1, and FIG. 5 is a flowchart showing another example of contact operation suppression processing.
The power conditioner 10 counts the number of operations of the protective relays (RPR/UPR) during operation control. Then, based on the number of times of operation of the protection relay or the number of remaining times of operation, control is performed to suppress the number of operations for increasing or decreasing the output of the distributed power supply at the power receiving end. For example, the power conditioner 10 sets the number of operation permission times for each unit period such as one day, week, or month based on the counted number of operations of the protection relay. Then, the power conditioner 10 limits the number of operations of the contact signal of the protection relay related to the output control of the distributed power supply.
Moreover, the power conditioner 10 switches the mode of operation control using the distributed power supply based on the counted number of operations of the protection relay. For example, the power conditioner 10 extends the start time (predetermined time D2) of the control operation and suppresses the ON/OFF operation of the contact signal related to control. The power conditioner 10 may suppress the ON/OFF operation of the contact signal related to control by relatively reducing the rate of increase or decrease of the power output generated by the distributed power sources. Furthermore, when it is predicted that the load will be large based on the operation history of the contact signal and the load fluctuation pattern, the output changes at high speed until just before the predicted load amount, and when the load and the power generation amount approach each other, the output changes. The ON/OFF operation can also be suppressed by slowing down the speed. In the operation control system 1, it is possible to control the output target of the distributed power supply that provides the optimum number of operations without being conscious of the load fluctuation of the consumer.

[Example 1]
Hereinafter, the operation control system 1 for distributed power sources according to the embodiment of the present invention will be described in more detail with reference to the drawings.

<System configuration>
FIG. 1 is a block diagram showing a schematic configuration of an operation control system 1 installed in a customer's premises. The operation control system shown in FIG. 1 is a system interconnection system that interconnects a photovoltaic power generation module 20 that is a distributed power source and a commercial power system (hereinafter also referred to as “commercial power source”) 2 . The operation control system 1 connects to a high-voltage (6,600 V) distribution line of a commercial power supply 2 .
In the customer's premises, a high voltage cubicle system for receiving high voltage power from the commercial power source 2 and converting it into a power source (3-phase 3-wire 200V) or lighting power source (single-phase 3-wire 200/100V) as needed. A power receiving facility 3 is provided. In FIG. 1, a load 5 is connected between the U phase and the neutral wire O of a single-phase three-wire power line 9 connected from the high-voltage power receiving equipment 3 through the distribution board 4, and the load 5 is placed between the W phase and the neutral wire O A load 6 is connected between each. A reverse power relay (RPR) 7 and an under power relay (UPR) 8, which are protective relays, are connected between the power receiving point Rp and the high-voltage power receiving equipment 3 . The reverse power relay 7 is a relay that detects reverse power flow to the commercial power supply 2, and outputs a detection signal when the power flowing backward to the commercial power supply 2 exceeds a threshold (RPR detection level). The underpower relay 8 is a relay that detects short-circuit accidents, ground faults, and power failures on the commercial power supply 2 side, and the forward power flow supplied from the commercial power supply 2 to the load on the consumer side exceeds the threshold (UPR detection level). When it falls below, it outputs a detection signal. Here, the threshold (UPR detection level) corresponds to the predetermined value of the invention.

A power conditioner 10 is connected to a single-phase three-wire power line 9 connected to loads 5 and 6 . The power conditioner 10 includes a power converter (inverter) 13 that converts the power generated by the photovoltaic module 20 into AC power synchronized with the power supplied from the commercial power supply 2, and the output of the power converter 13. An output current measuring device (current transformer: CT) 14 for detecting the magnitude of current, and a CT input circuit (AD
converter) 15, voltage input circuits 16A and 16B for inputting respective U-phase and W-phase voltages of the power line as detection signals, and a control unit (MPU) 12 as control means. The power conditioner 10 also has a storage unit 17 that stores programs such as an operation control program and various data. Here, the operation control system of the present invention is configured including the reverse power relay 7, the underpower relay 8 and the power conditioner 10. FIG. Also, the power conditioner 10 corresponds to the operation control device of the present invention.
The control unit 12 receives respective signals from the reverse power relay 7, the underpower relay 8, the CT input circuit 15, and the voltage input circuits 16A and 16B, and controls the forward power flow from the commercial power source 2 toward the loads 5 and 6 in a predetermined direction. When the power is below the power value, or when the reverse flow power to the commercial power source 2 is above a predetermined power value, the power converter 13 is controlled to adjust the output power.
The control unit 12 also counts the number of binary contact operations (on status, off status) of the reverse power relay 7 and the under power relay 8 that constitute the protection relays. The counted value is recorded in the storage unit 17 in association with identification information for identifying each relay, date information, and the like.

The output side of the control unit 12 is connected to a control unit (not shown) of the power conversion unit 13, and the input side of the power conversion unit 13 is connected to the output side of the photovoltaic module 20. The output of section 13 is connected to signal output section 18 . The signal output unit 18 includes a U-phase connection line 19A connected to the U-phase of the power line 9, a neutral connection line 19B connected to the neutral line of the power line 9, and a W-phase connected to the W-phase of the power line 9. It has a phase connection line 19C.

The input side of the voltage input circuit 16A is connected to the signal output section 18 to detect the U-phase voltage from the U-phase connection line 19A and the neutral connection line 19B of the signal output section 18. The input side of the voltage input circuit 16B is connected to the signal output section 18 to detect the W-phase voltage from the W-phase connection line 19C and the neutral connection line 19B.

Further, detection signal output sides of the reverse power relay 7 and the underpower relay 8 are connected to the control unit 12 .

Operation control processing in the operation control system 1 according to this embodiment will be described with reference to the flowchart shown in FIG. The operation control process described below is realized by causing the control unit 12 to execute an operation control program stored in a predetermined area of the storage unit 17 .

When the power conditioner 10 starts operating, first, the output control target value, which is the control target value of the power output from the power conditioner 10, is increased (step S1). Then, it is detected whether or not the detection signal of the underpower relay 8 is input (step S2). If it is determined in step S2 that the detection signal of the power shortage relay 8 has not been input, the process returns to step S1 to increase the output control target value. When it is determined in step S2 that the detection signal of the underpower relay 8 has been input, the output control target value is held (step S3).

While holding the output control target value, it waits until a predetermined time elapses (step S4). After a predetermined period of time has passed while the output control target is held, the output control target value is decreased (step S5).

With the output control target value reduced, it is detected whether or not the detection signal for the underpower relay 8 is input (step S6). When it is determined in step S6 that the detection signal of the power shortage relay 8 has been input, the process returns to step S5 to further decrease the output control target value. If it is determined in step S6 that the detection signal of the power shortage relay 8 has not been input, it is determined whether or not the elapsed time has passed (step S7).

If it is determined in step S7 that the predetermined time has not elapsed, the process returns to step S5 to further decrease the output control target value. If it is determined in step S7 that the predetermined time has elapsed, the output control target value is held (step S8).

With the output control target value held, it is determined whether or not the detection signal of the underpower relay 8 has been input (step S9). If it is determined in step S9 that the detection signal of the underpower relay 8 has been input, the process returns to step S5 to decrease the output control target value. If it is determined in step S9 that the detection signal of the power shortage relay 8 has not been input, it is determined whether or not a predetermined time has passed (step S10). That is, it waits for a predetermined time while holding the output control target value.

When the predetermined time has passed while the output control target value is held, the process returns to step S1 to increase the output control target value.

In parallel with the operation control described above, the control unit 12 monitors the presence or absence of a detection signal from the reverse power relay 7 (step S11). Then, when it is determined that the detection signal of the reverse power relay 7 has been input, gate block processing is performed (step S12). That is, the control unit 12 stops outputting power from the signal output unit 18 to the power line connected to the load.

With the gate block processing performed, it is determined whether or not the detection signals of the reverse power relay 7 and the power shortage relay 8 have been input (step S13). If it is determined in step S13 that the detection signals of the reverse power relay 7 and the underpower relay 8 have been input, the gate block processing is continued. If it is determined in step S13 that the detection signals of the reverse power relay 7 and the underpower relay 8 have not been input, it is determined whether or not a predetermined time has passed (step S14). That is, it waits for a predetermined time while continuing gate block processing.

If it is determined in step S14 that the predetermined time has elapsed, the process returns to step S1 to increase the output control target value.

In FIG. 3, the horizontal axis represents time, and the vertical axis represents the power at the power receiving point (upper), the output control target value of the power conditioner 10 and the UPR detection signal (middle), and the number of inputs of the UPR detection signal (lower). 3 is a timing chart of output control according to the embodiment.
Although the system according to this embodiment does not need to measure the power at the power receiving point, it is also shown in FIG. 2 for explanation. In addition, the power value shown on the vertical axis of the upper graph has 0 W between the PRR detection level and the UPR detection level, and the upward direction from 0 W along the vertical axis is the direction in which the reverse flow power increases. The downward direction along the vertical axis is the direction in which the forward current increases.

First, when the operation of the power conditioner 10 is started, the output control target value is increased. At this time, the power at the forward power receiving point decreases and becomes equal to or lower than the UPR detection level at time t1. In this way, when the power at the power receiving point becomes equal to or lower than the UPR detection level, the underpower relay 8 outputs a detection signal to the control section 12 . The time D1 from when the power at the receiving point becomes equal to or lower than the UPR detection level at time t1 to when the detection signal is output from the underpower relay 8 can be set to, for example, 0.5 seconds, but can be set as appropriate. can do. Note that in FIG. 3, the time D1 is displayed longer for convenience of explanation, and does not necessarily represent a comparison with other lengths such as the time D2.

When the detection signal of the power shortage relay 8 is input at time t2, the control unit 12 holds the output control target value. When the predetermined time D2 has passed from time t2 and reaches time t3, the control unit 12 decreases the output control target value. The time D2 can be set to 5 seconds, for example, but can be set as appropriate. As the output control target value is held from time t2 and decreased from time t3, the power at the receiving point increases. Then, when the power at the receiving point exceeds the UPR detection level, the detection signal of the underpower relay 8 is canceled at time t4. When the detection signal of the underpower relay 8 is released in this way and the detection signal of the underpower relay 8 is not output for a predetermined time, the control section 12 holds the output control target value. The predetermined time from when the detection signal of the underpower relay 8 is no longer detected to when the output control target value is held is not clearly shown in FIG. When the output control target value is held, the receiving point power is also held at a power exceeding the UPR detection level.

When the predetermined time D3 has passed from time t4 and reaches time t5, the control unit 12 increases the output control target value. The predetermined time D3 can be set to 60 seconds, for example, but can be set as appropriate. When the control unit 12 increases the output control target value, the power at the receiving point decreases. Then, when the power at the receiving point becomes equal to or lower than the UPR detection level, the underpower relay 8 outputs a detection signal.

When the detection signal is input from the power shortage relay 8 at time t6, the control unit 12 holds the output control target value. When a predetermined time D2 elapses from time t6 and reaches time t7, the control unit 12 decreases the output control target value. The power at the receiving point, which decreases as the output control target value increases, increases as the output control target value is held from time t6 and decreased from time t7. Then, when the power at the receiving point exceeds the UPR detection level, the detection signal of the underpower relay 8 is canceled at time t8. If the detection signal of the underpower relay 8 is not output, the control section 12 holds the output control target value.

Here, when the output control target value is held, the power at the receiving point is also held at power exceeding the UPR detection level. Regardless of the output control of the power conditioner 10, the power at the power receiving point may decrease and become equal to or lower than the UPR detection level. In such a case, the detection signal is input from the underpower relay 8 even when the control unit 12 holds the output control target value. At time t9, when such a detection signal of the power shortage relay 8 is input, the control section 12 decreases the output control target value. After that, the power at the power receiving point exceeds the UPR detection level, and the detection signal of the underpower relay 8 is canceled at time t10. If the detection signal of the underpower relay 8 is not output, the control section 12 holds the output control target value.

Although not shown in FIG. 3, when the power at the receiving point exceeds the RPR detection level, the reverse power relay 7 outputs a detection signal. When the detection signal is input from the reverse power relay 7, the control section 12 performs gate block processing.

In this embodiment, the operation control of the photovoltaic power generation module 20 is performed using the reverse power relay 7 and the underpower relay 8 that can be installed together. Therefore, when the reverse power relay 7 is already installed, it is sufficient to install the underpower relay 8, so the installation work load is small. In addition, the use of equipment having a simple configuration such as the underpower relay 8 that outputs a detection signal when it is detected that the forward power flow at the power receiving point Rp is equal to or less than a predetermined value does not require expensive equipment. Reverse power flow can be prevented with a simple configuration at a low cost.

In addition, the power state of the power receiving point Rp detected by the reverse power relay 7 and the underpower relay 8 that constitute the protective relay is not an analog signal indicating a voltage value or a current value like a voltage transformer (CT), but is It is a binary contact signal (for example, ON status, OFF status) for determining whether or not the received power exceeds a predetermined value. For this reason, when effectively utilizing power generated by photovoltaic power generation at a level close to the power level at which reverse power flow occurs to the grid side, the operating frequency of the contact signal increases. In general, protective relays operate for the purpose of detecting abnormal conditions such as power outages and accidents in equipment related to power usage, and are not intended for frequent contact operations. That is, in the protective relay, for example, a predetermined number of times of operation (for example, 30,000 times/10 years) is set based on the lifetime or the like, and the number of times of operation may limit the contact operation. If this limit is exceeded, the abnormality detection operation intended by the protection relay is not performed, and there is a risk that equipment related to power usage will malfunction.

Therefore, in the operation control system 1 according to the first embodiment, the increase/decrease in the output of the distributed power supply at the power receiving point Rp is controlled based on the number of times the protection relay (RPR/UPR) is operated or the number of remaining operations. do. More specifically, the power conditioner 10 of this operation control system has an operation counter function for counting the number of operations of the protection relay, and stores the counted number of operations of the protection relay. Then, in this operation control system, for example, when the control power supply of the power conditioner 10 is turned on, the number of operation permission times of the protection relay is set. The number of operation permission times is set in advance for each unit period such as one day, week, or month based on the life of the protection relay, for example. According to this operation control system, for example, since the number of operation permission times in a unit period such as one day can be set as a target, the number of operations of the contact signal of the protective relay can be limited.

For example, the power conditioner 10 subtracts 1 count number from the set number of operation permission times each time the protective relay is turned ON/OFF. Then, in the power conditioner 10, for example, the surplus of the allowable number of times that the ON/OFF contact of the protection relay did not operate is accumulated, and the operation of adding it to the allowable number of times after the next day is performed. As a result, for example, in a consumer with little load fluctuation in the premises per week, it is possible to control the output target of the distributed power supply within the daily limit of the number of operations of the contact signal. The life of the contact signal of the protection relay is also ensured. In addition, by rotating the remaining allowable number of times to the next day, for example, for consumers whose regular load is low on weekends, the contacts of the protective relay do not operate on weekdays, and the contacts operate collectively on Saturdays and Sundays. It becomes possible to do The operation control system 1 enables detailed output control of the distributed power sources when the load is light. According to the operation control system 1, it is possible to control the output target of the distributed power supply that provides the optimum number of operations without being conscious of load fluctuations of the consumer.

Moreover, the power conditioner 10 may perform control so as to suppress the ON/OFF operation of the protective relay based on the total number of operations of the protective relay. For example, in the timing chart shown in FIG. 3, the control operation start time (predetermined time D2) can be set relatively long to suppress the ON/OFF operation of the contact signal related to control. Further, the predetermined time from when the detection signal of the protective relay (underpower relay 8) is no longer detected until the transition to holding of the output control target value may be set relatively long. The same applies to the predetermined time D3.

Moreover, the power conditioner 10 may suppress the ON/OFF operation of the contact signal related to the control by relatively reducing the change speed of the increase/decrease in the power output generated by the distributed power sources. Since the change speed of the output control target value with respect to the power generated by the photovoltaic power generation module 20 is switched to a low speed, for example, the frequency of ON/OFF operation of the contact signal output from the underpower relay 8 to the control unit 12 is suppressed. be.

In addition, the power conditioner 10 predicts the amount of power consumed by the loads 5 and 6 based on the load fluctuation pattern, and suppresses the ON/OFF operation of the contact signal related to control based on the prediction. good too. For example, when the load is predicted to be large, the output change speed is increased until just before the predicted load amount, and when the load and the power generation amount are approaching, the output change speed is decreased to suppress the ON/OFF operation. can be done.

Furthermore, based on the stored history of ON/OFF operation times of the protection relay, the power conditioner 10 switches the output change speed to a low speed to suppress the ON/OFF operation when the number of operations is large. can be For example, if the number of ON/OFF operations in the most recent predetermined period (for example, one week) is more than a predetermined threshold value, the speed of output change may be switched to a low speed. It is possible to suppress the contact operation of the protection relay according to the load fluctuation of the consumer and the fluctuation of the power generation amount of the photovoltaic power generation module 20 .

FIG. 4 is a flowchart showing an example of contact operation suppression processing in the operation control system 1 according to the present embodiment. The suppression process described below is realized by causing the control unit 12 to execute an operation control program stored in a predetermined area of the storage unit 17 .

When the operation of the power conditioner 10 is started, first, the allowable number of UPR operations of the underpower relay 8 constituting the protective relay is set (step S101). The permitted number of PR operations is represented, for example, by adding the variable X, which is the amount carried over from the previous day, and the number i of operations of the underpower relay 8 per unit period. The number i of operations per unit period is expressed, for example, by dividing the total number of operations predetermined by the life of the protection relay or the like by the unit period. For example, if the total number of times of operation is 30000 times/10 years, the number of times i of operation is expressed as about 8 times/day. After the process of step S101, the process proceeds to step S102 to determine whether or not the detection signal of the underpower relay 8 has been input.

If it is determined in step S102 that the detection signal of the underpower relay 8 has not been input (step S102, "No"), the process proceeds to step S105, and if it is determined that the detection signal of the underpower relay 8 has been input. (step S102, "Yes"), the process proceeds to step S103. At step 103, it is determined whether or not the current UPR operation count permission number is zero. In step S102, if the current allowable number of UPR operations is 0 (step S103, "Yes"), the process proceeds to step S105, and if the current allowable number of UPR operations is not 0 (step S103, " No"), the process proceeds to step S104. In step S104, one count is subtracted from the allowable number of UPR operations set in step S101. The process proceeds to step S105.

In step S105, it is determined whether or not the OFF state of the control power source has been detected. If it is determined in step S105 that the OFF state of the control power supply has been detected (step S105, "Yes"), the process proceeds to step S106, and if it is determined that the OFF state of the control power supply has not been detected (step S105, "No"), the process proceeds to step S102. In step S106, it is determined whether or not the current allowable number of UPR operations is zero. If it is determined in step S106 that the current allowable number of UPR operations is not 0 (step S106, "Yes"), the process proceeds to step S107. (step S106, "No"), this routine is temporarily terminated. In step S107, a variable X is set to the permitted number of UPR operations, which is carried over to the next day. When the process of step S107 is finished, this routine is once finished.

With the above processing, the operation control system increments the number of times of operation permission set when the control power supply of the power conditioner 10 is turned on every time the power shortage relay 8 constituting the protective relay is turned on/off. can be subtracted. Then, this operation control system, for example, accumulates the surplus of the allowable number of times that the ON/OFF contact of the underpower relay 8 constituting the protection relay did not operate, and causes the operation to be added to the allowable number of times after the next day. be able to. As a result, in the case of a consumer whose regular load is low on weekends and the like, it is possible to carry over the allowed number of times for the rest of weekdays, and to perform the contact operation collectively on Saturdays and Sundays when the load increases.

FIG. 5 is a flowchart showing another example of the contact operation suppression process in the operation control system 1 according to the present embodiment. The suppression process described below is realized by causing the control unit 12 to execute an operation control program stored in a predetermined area of the storage unit 17 .

When the operation of the power conditioner 10 is started, first, count values of ON/OFF operations of the reverse power relay 7 and the power shortage relay 8 that constitute the protective relays are obtained (step S111). The control unit 12 that executes the process acquires, for example, the current ON/OFF operation count values of the reverse power relay 7 and the underpower relay 8 recorded in the storage unit 17 . Then, in step S112, it is determined whether or not the count value of ON/OFF operations of the reverse power relay 7 and the underpower relay 8 obtained in step S111 exceeds a threshold value. Here, the threshold is the number of operations that serves as an index for ensuring the life of the protection relay. can be determined in advance according to the amount of power generation, etc.

If it is determined in step S112 that the ON/OFF operation count value of the reverse power relay 7 or the underpower relay 8 exceeds the threshold value (step S112, "Yes"), the process proceeds to step S113. If so (step S112, "No"), this routine is once terminated. In steps S113 to S116, a process of suppressing the ON/OFF operation of the reverse power relay 7 or the power shortage relay 8 exceeding the threshold is performed. The execution of the processes from step S113 to step S116 can be appropriately set according to the total number of operations of the reverse power relay 7 or the underpower relay 8 exceeding the threshold, the load amount of the consumer, the power generation amount of the distributed power supply, etc. . For example, one of the processes shown in steps S113 to S116 may be executed, or a combination of multiple processes may be executed.

In step S113, the start time of the control operation (increase/decrease of power generation output) is set relatively long, and the ON/OFF operation of the contact signal related to control is suppressed. For example, the periods of the predetermined times D2 and D3 in the timing chart shown in FIG. 3 are set relatively long. In addition, it is also possible to set a relatively long predetermined time period from when the detection signal of the power shortage relay 8 is no longer detected to when the output control target value is maintained. The predetermined times D2 and D3 and the predetermined time until transition to holding of the output control target value may be set long at the same time.

In step S114, the speed at which the power output generated by the distributed power source increases or decreases is relatively decreased (switched to low speed operation), and the ON/OFF operation of the contact signal related to control is suppressed. In step S115, the magnitude of the power load consumed by the loads 5 and 6 is predicted based on the load fluctuation pattern, and the ON/OFF operation of the contact signal related to control is suppressed based on the prediction. For example, when the load is predicted to be large, the output change speed is increased until just before the predicted load amount, and when the load and the power generation amount approach each other, the output change speed is decreased to suppress the ON/OFF operation. In step S116, based on the history of the number of ON/OFF operations of the reverse power relay 7 and the power shortage relay 8 recorded in the storage unit 17, the output change speed of the power generation of the distributed power supply is switched to a low speed, /OFF operation is suppressed. For example, when the number of ON/OFF operations in the most recent predetermined period (for example, one week) exceeds a predetermined threshold number of operations, the speed of output change is switched to a low speed. When the process of step S116 ends, this routine ends.

With the above processing, the present operation control system obtains the count value (total number of times of operation) of the ON/OFF operation of the protection relay (one or both of the reverse power relay 7 and the underpower relay 8) recorded in the storage unit 17. Based on, the ON/OFF operation of the protection relay can be suppressed. According to this operation control system, it is possible to provide a technology capable of suppressing the contact operation of the protection relay and preventing reverse power flow according to the load fluctuation of the consumer and the fluctuation of the power generation amount of the photovoltaic power generation module 20 .

[Example 2]
FIG. 6 is a block diagram showing a schematic configuration of the operation control system 100 according to the second embodiment. Configurations common to the operation control system according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The operation control system 100 is interconnected with a high-voltage distribution line of a commercial power system. Also in this embodiment, high-voltage power is received from the commercial power supply 2, and between the U phase and the neutral line of the single-phase three-wire power line 9 connected via the high-voltage power receiving equipment 3 and the distribution board 4 A single-phase load 5 and a single-phase load 6 are connected between the W phase and the neutral wire O, respectively. In this embodiment, power is supplied from three power conditioners 10A, 10B, and 10C to this power line 9 (description of distributed power sources whose outputs are controlled by the respective power conditioners 10A, 10B, and 10C is omitted). are doing.). Further, in this embodiment, a three-phase load 21 is connected to a three-phase, three-wire power line 29 connected via the high-voltage power receiving equipment 3 and the distribution board 4 . Here, power conditioners 10A, 10B, and 10C correspond to the operation control device of the present invention.

In this embodiment, the power conditioners 10A and 10B are connected by a communication line 22, and the power conditioners 10B and 10C are connected by a communication line 23. FIG. Information is transmitted and received between the power conditioner 10A and the power conditioner 10B, and between the power conditioner 10B and the power conditioner 10C, for example, by CAN communication, but the communication method is not limited to this.
Detection signals from the reverse power relay 7 and the power shortage relay 8 are input only to the power conditioner 10A. Operation control based on the detection signals of the reverse power relay 7 and the power shortage relay 8 is performed via communication lines 22 and 23, with the power conditioner 10A as the master and the power conditioners 10B and 10C as slaves. , 10B and 10C work together. Here, the control units of the power conditioners 10A, 10B, and 10C that cooperate with each other correspond to the control unit of the present invention. If the power conditioners 10A, 10B, and 10C have the same rating, each output control target value may be increased or decreased at the same rate. However, the method of increasing or decreasing the output control target values of the power conditioners 10A, 10B, and 10C when increasing or decreasing the output control target values is not limited to this. The method of increasing or decreasing the output target value may be appropriately set according to the difference in ratings of the power conditioners 10A, 10B, and 10C and the difference in the connected distributed power sources.
Further, in the present embodiment, power is supplied to the power line 9 from three power conditioners, but the number of power conditioners that supply power to the power line 9 may be two, or four or more. good.

In this embodiment, a power shortage relay 8 that can be installed together with a reverse power relay 7 is used to control the operation of a plurality of distributed power sources. Therefore, when the reverse power relay 7 is already installed, it is sufficient to install the underpower relay 8, so the installation work load is small. In addition, the use of equipment having a simple configuration such as the underpower relay 8 that outputs a detection signal when it is detected that the forward power flow at the power receiving point Rp is equal to or less than a predetermined value does not require expensive equipment. Reverse power flow can be prevented with a simple configuration at a low cost.

In the same manner as in the first embodiment, the operation control system 100 of the second embodiment is based on the number of times the reverse power relay 7 and the underpower relay 8, which constitute protective relays, operate, or the number of remaining operations, to determine the dispersion at the power receiving point Rp. Controls the increase/decrease of the output of the model power supply. The power conditioner 10A of this operation control system has an operation counter function for counting the number of operations of the protection relay, and stores the counted number of operations of the protection relay. In the second embodiment, the operation control system 100 may execute the contact operation suppression process described with reference to FIGS. 4 and 5 . According to this operation control system, for example, since the number of operation permission times in a unit period such as one day can be set as a target, the number of operations of the contact signal of the protection relay can be limited. Also in the embodiment 2, it is possible to finely control the output of distributed power sources when the load is small. Target control becomes possible.

The configurations of the above-described embodiments can be combined as much as possible without departing from the subject and technical idea of the present invention. For example, in the above-described embodiment, an example of application to an operation control system equipped with photovoltaic power generation modules as a distributed power source was explained, but the present invention is applied to an operation control system equipped with storage battery modules in addition to photovoltaic power generation modules. The invention can be applied. In place of the photovoltaic power generation module, the present invention can be applied to an operation control system using energy such as a fuel cell module, a gas engine module, a wind power generation module, a tidal power generation module, a hydraulic power generation module, a geothermal power generation module, or a combination thereof. can also be applied.

In order to allow comparison between the constituent elements of the present invention and the configurations of the embodiments, the constituent elements of the present invention will be described below with reference numerals in the drawings.
<Invention 1>
An operation control system (1) for operating a distributed power supply (20) connected to a commercial power system (2),
a forward power flow detector (8) that operates to output a first detection signal when it is detected that the forward power flow at the power receiving point (Rp) connected to the commercial power system (2) is equal to or less than a predetermined value; ,
a reverse power detection unit (7) that operates to output a second detection signal when reverse flow power is detected at the power receiving point (Rp);
Power supplied from the commercial power system (2) is connected to a power line (9) that supplies loads (5, 6), and power is supplied from the distributed power supply (20) to the loads (5, 6). a control unit (12) for controlling a control target value of electric power supplied to the load based on the input of the first detection signal;
with
The control unit (12)
counting the number of times the first detection signal is input and storing it in a storage unit (17);
reducing or maintaining the control target value of the power supplied to the loads (5, 6) based on information related to the number of operations of the forward power flow detection unit (8);
An operation control system (1) characterized by:

1, 100: Operation control system 2: Commercial power supply 5, 6, 21: Load 7: Reverse power relay 8: Underpower relay 10, 10A, 10B, 10C: Power conditioner 20: Solar power generation module Rp: Power receiving point

Claims (11)

An operation control system for operating a distributed power supply connected to a commercial power system,
provided on a power line that connects the commercial power system and a high-voltage power receiving facility that receives power supplied from the commercial power system, and forward flow power at a power receiving point between the commercial power system and the high-voltage power receiving facility an underpower relay that outputs a first detection signal indicating that the forward flow power is equal to or less than a predetermined value when it is detected to be equal to or less than a predetermined value;
provided on a power line that connects the commercial power system and the high-voltage power receiving equipment, and when reverse flow power of power generated by the distributed power supply to the commercial power system is detected at the power receiving point , a reverse power relay that outputs a second detection signal indicating that the reverse power flow is detected;
A control unit connected to a power line that supplies power supplied from the commercial power system to a load and controls power supplied from the distributed power supply to the load, wherein the control target of the power supplied to the load value is increased so that the input of the second detection signal output from the reverse power relay is not detected, and is supplied to the load according to the presence or absence of the input of the first detection signal output from the underpower relay. a control unit that controls to reduce or maintain the control target value of the power supplied;
with
The control unit
counting the number of times the first detection signal is input and storing it in a storage unit;
Based on the counted number of times of input of the first detection signal and information for limiting the number of ON/OFF operations of the power shortage relay, a predetermined total number of operations is reached according to the life of the power shortage relay. changing the degree of reduction of the control target value of the power supplied to the load or the length of the holding period so as to increase the period until the power shortage relay operates,
An operation control system characterized by: The information for limiting the number of ON/OFF operations of the underpower relay is the total number of operations of the underpower relay or the allowable number of operations, which is the limit value of the number of operations in a unit period set for the underpower relay. including
The control unit subtracts the difference between the total number of operations and the counted number of inputs of the first detection signal or the number of inputs of the first detection signal counted in the unit period from the allowable number of operations. 2. The operation control system according to claim 1, wherein the degree of reduction of the control target value of the power supplied to the load or the length of the holding period is changed according to the number of remainders. The control unit
accumulating the remaining number of times counted at the end of the unit period, adding it to the allowable number of operations in the unit period continuing on the time series, and carrying over to the allowable number of operations in the unit period continuing on the time series; The operation control system according to claim 2, characterized by: The control unit
counting the number of times the second detection signal is input and storing it in a storage unit;
Control operation to reduce or hold the control target value of the power supplied to the load when the count value of the counted number of times of input of the first detection signal or the second detection signal exceeds a predetermined threshold 4. The operation control system according to any one of claims 1 to 3, wherein the start timing of the control action is relatively extended to suppress the frequency of operation of the underpower relay. The control unit
When the count value of the number of times the first detection signal or the second detection signal is input exceeds a predetermined threshold value, the control operation to decrease or hold the control target value of the power supplied to the load is performed. 5. The operation control system according to claim 4, wherein the rate of change is relatively lowered to suppress the frequency of operation of the underpower relay. The control unit
When the count value of the number of times the first detection signal or the second detection signal is input exceeds a predetermined threshold, the power consumption of the load estimated based on the fluctuation pattern of the power supplied to the load is increased. When it is relatively large, the rate of change of the control action to decrease or maintain the control target value of the power supplied to the load until immediately before reaching the estimated power consumption of the load is relatively increased. to the target value of the power supplied to the load according to the difference between the power consumption of the load and the estimated power consumption of the load, or the control operation of holding 6. The operation control system according to claim 4, wherein the rate of change of is relatively reduced. The control unit
When the count value of the number of times the first detection signal or the second detection signal is input exceeds a predetermined threshold, based on the history of the number of times the first detection signal or the second detection signal is input, the most recent predetermined When the frequency of operation of the underpower relay or the reverse power relay in the period increases, the change speed of the control operation to decrease or maintain the control target value of the power supplied to the load is relatively increased. 7. The operation control system according to any one of claims 4 to 6, characterized in that it lowers to . An operation control device for operating a distributed power supply connected to a commercial power system,
A control unit connected to a power line that supplies power supplied from the commercial power system to a load and controls power supplied from the distributed power supply to the load, wherein the commercial power system and the commercial power system Forward flow power at a power receiving point between the commercial power system and the high-voltage power receiving equipment of an underpower relay installed on a power line connected to the high-voltage power receiving equipment that receives the supplied power is equal to or less than a predetermined value. a first detection signal indicating that the forward flow power is equal to or less than a predetermined value when the
A reverse power relay provided on a power line that connects the commercial power system and the high-voltage power receiving equipment, at the power receiving point, reverse power flow power of the power generated by the distributed power supply to the commercial power system When detected, the second output from the reverse power relay outputs a control target value of power supplied to the load based on input with a second detection signal indicating that the reverse power flow has been detected. The input of the detection signal is increased so as not to be detected, and the control target value of the electric power supplied to the load is decreased or held according to the presence or absence of the input of the first detection signal output from the power shortage relay. A control unit that controls to
The control unit
counting the number of times the first detection signal is input and storing it in a storage unit;
Based on the counted number of times of input of the first detection signal and information for limiting the number of ON/OFF operations of the power shortage relay, a predetermined total number of operations is reached according to the life of the power shortage relay. changing the degree of reduction of the control target value of the power supplied to the load or the length of the holding period so as to increase the period until the power shortage relay operates,
An operation control device characterized by: An operation control method executed by a control unit of an operation control device that operates a distributed power supply connected to a commercial power system,
A power receiving point between the commercial power system and the high voltage power receiving equipment of a power shortage relay provided on a power line connecting the commercial power system and the high voltage power receiving equipment receiving power supplied from the commercial power system. counting and storing the number of inputs of a first detection signal indicating that the forward current power is equal to or less than a predetermined value when it is detected that the forward current power is equal to or less than a predetermined value;
A reverse power flow of power generated by the distributed power supply to the commercial power system in the first detection signal and a reverse power relay provided on a power line connecting the commercial power system and the high-voltage power receiving equipment. When the power is detected, the control target value of the power supplied to the load from the commercial power system is set from the reverse power relay based on the input of the second detection signal indicating that the reverse power flow is detected. The control target value of the power supplied to the load is increased so that the input of the output second detection signal is not detected, and the power supplied to the load is increased according to the presence or absence of the input of the first detection signal output from the power shortage relay. controlling to reduce or maintain
Based on the counted number of times of input of the first detection signal and information for limiting the number of ON/OFF operations of the power shortage relay, a predetermined total number of operations is reached according to the life of the power shortage relay. changing the degree of reduction of the control target value of the power supplied to the load or the length of the holding period so as to increase the period until the power shortage relay operates;
operation control method including The control target value of the power supplied to the load is the control target value of the reverse power flow power supplied from the distributed power source to the commercial power system, and the control unit controls the control target value of the reverse power flow power supplied to the load. The operation control system according to any one of claims 1 to 7, wherein the control target value is increased so that the input of the second detection signal output from the reverse power relay is not detected, or The operation control device according to claim 8 or the operation control method according to claim 9. The control target value of the power supplied to the load is the upper limit value of the reverse power flow power supplied from the distributed power source to the commercial power system, and the control unit controls the control target value of the reverse power flow power supplied to the load. The operation control system according to any one of claims 1 to 7, wherein the upper limit value of is increased so that the input of the second detection signal output from the reverse power relay is not detected, or The operation control device according to claim 8 or the operation control method according to claim 9.

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