JP6797073B2 - Operation control device and power generation equipment - Google Patents

Description

The present invention relates to an operation control device and a power generation facility that control the operation of the power generation device.

As described in Patent Document 1, a power generation device 15 such as a fuel cell may be installed in a consumer facility such as a house, and at least a part of the power load in the consumer facility may be covered by the power generated by the power generation device 15. It is done. FIG. 4 is a circuit diagram schematically describing the system described in Patent Document 1. As shown in the figure, a watt hour meter 2 is connected to a service line 1 drawn from the power system, and a power line 3 connected to the watt hour meter 2 is connected to a main breaker 4. In such a single-phase three-wire power receiving facility, the power line 3 is a total of three power lines 3u, 3n, 3v, which are a voltage line U-phase line and a V-phase line and a neutral line N-phase line. It is composed of. If a 3P2E type is used for the main breaker 4, the continuation of overcurrent in the U-phase power line 3u and the V-phase power line 3v is prevented. That is, when the current flowing through the U-phase power line 3u or the V-phase power line 3v exceeds, for example, the breaking capacity of 30A, the main breaker 4 forcibly cuts off the power line 3 until a predetermined time elapses.

In the example shown in FIG. 4, a power load 16u having a 100V load is connected to the U-phase power line 3u, and a power load 16v having a 100V load is connected to the V-phase power line 3v. In addition, the power generation device 15 is connected to the power line 3 (3u, 3n, 3v) via the wiring 13 (13u, 13n, 13v). In this example, the power consumption of the power load 16u is 0W, and the power consumption of the power load 16v is 3500W. In this case, since the power generation device 15 is generating 1000 W (200 V), a current of 5 A flows through each of the U-phase wiring 13u and the V-phase wiring 13v. In the figure, the output current of the power generation device 15 is indicated by a minus sign. The current flowing through the U phase of the main breaker 4 is −5 A, and the current flowing through the V phase of the main breaker 4 is 30 A. Therefore, of the power consumption of 3500 W, 1000 W is covered by the power supplied from the power generation device 15, and 2500 W is covered by the power supplied from the power system.

As described above, in the example shown in FIG. 4, the magnitude of the current flowing through the U-phase power line 3u is 5A, and the magnitude of the current flowing through the V-phase power line 3v is 30A. Therefore, the breaking capacity of the main breaker 4 If is 30A, the main breaker 4 does not shut off. However, in the example shown in FIG. 4, the magnitude of the current flowing through the N-phase power line 3n is 35A. That is, when the power generation device 15 is performing power generation operation, the current flowing through the U-phase line and the V-phase line among the currents of each phase flowing through the main breaker 4 depends on the load states of the power load 16u and the power load 16v. Even if it is not an overcurrent, the current flowing through the N-phase wire (neutral wire) may become an overcurrent. However, when a 3P2E type main breaker 4 is used, it does not have a function to cut off based on the overcurrent of the N-phase line, so that the continuation of the overcurrent in the U-phase line and the V-phase line is prevented. However, there is a problem that the continuation of overcurrent in the N-phase wire is not prevented. Further, replacing the already installed 3P2E type main breaker with a 3P3E type main breaker that can prevent the continuation of overcurrent in the N-phase line has a problem in that the cost increases.

In view of such a problem, in the invention described in Patent Document 1, the main breaker 4 directly measures the current flowing through the N-phase line (neutral line) which is not the target of overcurrent prevention, or the U-phase. By calculating the current flowing through the N-phase wire (neutral wire) using the measurement results of the current flowing through the wire and the V-phase wire, measures are taken to prevent the overcurrent in the N-phase wire from continuing. Specifically, the current value flowing through the N-phase line is calculated using the detected current values of the U-phase line and the V-phase line, and when the calculated current value becomes equal to or higher than the first set value, the output of the power generation device 15 is output. When the current value is lowered and the calculated current value becomes greater than or equal to the second set value larger than the first set value, the output of the power generation device 15 is stopped.

As described above, in the invention described in Patent Document 1, attention is paid to whether or not the current flowing through the N-phase line (neutral line) is an overcurrent, and the current flows through the N-phase line (neutral line). It is premised to know the current value.

Patent Document 1 does not specifically describe what kind of circuit configuration the power generation device 15 is connected to the power system, but this point will be considered below.
FIG. 5 is a diagram schematically showing the internal structure of the distribution board 11. As shown in FIG. 5, the watt hour meter 2 is connected to the service line 1 drawn from the power system, and the power line 3 connected to the watt hour meter 2 is drawn into the distribution board 11. In the distribution board 11, the main breaker 4, the earth leakage breaker 5, and the plurality of branch breakers 12 as wiring breakers are installed in order when viewed from the upstream side (power system side) of the power line 3. In the case of such a single-phase three-wire power receiving facility, the power lines 3 are a total of three power lines 3u, 3n, which are voltage lines U-phase and V-phase lines and neutral N-phase lines. It is composed of 3v. The electric cable as the power line 3 connected to the primary side (upstream side) of the main breaker 4 is fastened to the primary side terminal 4a by the screw 9 as the power line 3 connected to the secondary side (downstream side) of the main breaker 4. The electric cable is fastened to the secondary terminal 4b by a screw 10.

In the distribution board 11 illustrated in FIG. 5, an electric cable is used for the power line 3 connecting the main breaker 4 and the earth leakage breaker 5, and the power line 3 connecting the earth leakage breaker 5 and each branch breaker 12 is used. Electric cables and copper bars 6u, 6n, 6v are used. In this way, three copper bars 6u, 6n, 6v corresponding to the power lines 3u, 3n, 3v of each of the U phase, N phase, and V phase are installed, and each branch is formed from the copper bars 6u, 6n, 6v. The power line 3 is branched to the breakers 12 (12a, 12b, 12c, 12d). The copper bars 6u, 6n, and 6v of the example shown in FIG. 5 have a configuration in which the crossover bar is fixed by the screw 8 at the screw hole 7.

As shown in FIG. 5, if a screw hole 7 for connecting another crossover bar or the like remains on the copper bars 6u, 6n, 6v, the screw hole 7 is used exclusively for the power generation device 15. The breaker of the above can be additionally connected, and the power generation device 15 can be connected to the power line 3 drawn into the consumer facility via the dedicated breaker. If the power generation device 15 is connected in this way, the circuit configuration as shown in FIG. 4 will be obtained.

Japanese Patent No. 4540248

When there is no screw hole 7 or the like for connecting other wiring on the copper bars 6u, 6n, 6v as shown in FIG. 5, the main breaker 4, the earth leakage breaker 5, and the branch breaker 12 are used in the first place. If the power line 3 between them is not exposed in the form of a copper bar or the like, there is a problem that a dedicated breaker cannot be installed in the power generation device 15. In such a case, the following two methods can be considered as a method of installing a breaker dedicated to the power generation device 15.

As shown in FIG. 6, the first method is a method of connecting a dedicated breaker 14 to the power generation device 15 on the primary side (upstream side) of the main breaker 4. That is, since the power line 3 is fixed to the primary side of the main breaker 4 by a screw 9 or the like, the wiring 13 (13u, 13n, 13v) connected to the breaker 14 dedicated to the power generation device 15 using the screw 9 is also used. Both can be fixed. However, if such an installation method of the breaker 14 is adopted, the construction will be carried out on the upstream side (electric power system side) of the main breaker 4, so that the electric power company that manages the electric power system will cause a power outage. There is a problem that you need to get it. Further, even if the main breaker 4 is cut off, if the breaker 14 is not cut off, the power generation device 15 remains connected to the power system.

The second method is a method of connecting a dedicated breaker 14 to the power generation device 15 on the secondary side (downstream side) of the main breaker 4, as shown in FIG. That is, since the power line 3 is fixed by a screw 10 or the like on the secondary side of the main breaker 4, the wiring 13 (13u, 13n, 13v) connected to the breaker 14 dedicated to the power generation device 15 using the screw 10 Can be fixed together. However, when such an installation method of the breaker 14 is adopted, the secondary side terminal 4b of the main breaker 4 and the plurality of branch breakers 12 are used even though the current exceeding the breaking capacity of the main breaker 4 does not flow. Of the electric paths between the two, a current exceeding the breaking capacity can continue to flow in the portion between the connection portion (secondary terminal 4b in FIG. 7) to which the power generation device 15 is connected and the plurality of branch breakers 12. There is sex.

8 and 9 are diagrams schematically showing the current flowing through the single-phase three-wire power receiving facility. Specifically, FIG. 8 shows a state in which the power generation device 15 is not generating power, and FIG. 9 shows a state in which the power generation device 15 is generating power of 1000 W (200 V). In the figure, the output current of the power generation device 15 is indicated by a minus sign.

As shown in FIG. 8, the power load 16a, which is a 100V load connected to the U-phase power line 3u, consumes 2500W of power, and the power load 16b, which is also a 100V load connected to the U-phase power line 3u. Is consuming 3000W of power. In this case, a current of 25 A flows through the U-phase and N-phase of the branch breaker 12a, and a current of 30 A flows through the U-phase and N-phase of the branch breaker 12b. Since all the power consumption (5500 W) is covered by the power received from the power system, a current of 55 A flows through the U phase and the N phase of the main breaker 4. Therefore, if the breaking capacity of the main breaker 4 is 50A as described above, the main breaker 4 shuts off before a predetermined time elapses.

Also in the case of FIG. 9, the power load 16a consumes 2500 W of power, and the power load 16b consumes 3000 W of power. In addition, since the power generation device 15 is generating 1000 W (200 V), a current of 5 A is supplied from the power generation device 15 via the U-phase wiring 13u, and the current of 5 A is supplied via the V-phase wiring 13v. Current is supplied. That is, of the 5500 W required by the power load 16a and the power load 16b, 1000 W is covered by the generated power of the power generation device 15, and the remaining 4500 W is received and measured by the watt hour meter 2. Of the current (55A) supplied to the U-phase power load 16a and the power load 16b, 5A is covered by the current supplied from the power generation device 15, so that the U-phase of the main breaker 4 has 50A. Electric current flows.

In the case of FIG. 9, since the current flowing through the U phase and the V phase of the main breaker 4 is 50 A or less, which is the breaking capacity, the breaking operation does not occur. However, the power generation device 15 is connected to the U-phase line on the secondary side (downstream side) of the main breaker 4, that is, the electric path between the secondary terminal 4b of the main breaker 4 and the plurality of branch breakers 12. A total current of 55 A, including the current (5 A) supplied from the power generation device 15, flows through the U-phase line of the portion between the connection portion and the plurality of branch breakers 12. In addition, a current of 55 A is flowing even in the N-phase wire, which is a neutral wire that is not monitored by the main breaker 4.

In this way, when the power generation device 15 is connected at a predetermined connection portion in the electric path between the secondary side terminal 4b of the main breaker 4 and the plurality of branch breakers 12, the branch breaker 12 is connected from the connection portion. There is a possibility that the overcurrent flowing in the electric path leading to is left unattended.

The present invention has been made in view of the above problems, and an object of the present invention is an operation control device capable of preventing an overcurrent from continuously flowing in an electric path from the secondary side of the main breaker to the branch breaker. And to provide power generation equipment.

The characteristic configuration of the operation control device according to the present invention for achieving the above object is that the primary side terminal is connected to the main breaker connected to the power system and the secondary side terminal of the main breaker. A plurality of branch breakers are provided, and a power generation device is changed to U-phase and V-phase at a predetermined connection portion in a single-phase three-wire electric path between the secondary terminal of the main breaker and the plurality of branch breakers. An operation control device that controls the operation of the power generation device in the connected power receiving equipment.
Of the electric path between the secondary terminal of the main breaker and the branch breakers, the U-phase flows between the connection portion to which the power generation device is connected and the branch breakers. When the U-phase current or the V-phase current flowing through the V-phase becomes equal to or higher than the first set value, the output current of the power generator is reduced, and the U-phase current or the V-phase current is larger than the first set value. The point is that a current control unit is provided to make the output current of the power generation device zero when the value exceeds the set value of.

According to the above-mentioned feature configuration, the current control unit is a portion of the electric path between the secondary terminal of the main breaker and the plurality of branch breakers, between the connection portion to which the power generation device is connected and the plurality of branch breakers. When the U-phase current flowing through the U-phase or the V-phase current flowing through the V-phase exceeds the first set value, the output current of the power generation device is reduced. That is, as the output currents of the U-phase and V-phase of the power generation device decrease, among the electric paths between the secondary terminal of the main breaker and the plurality of branch breakers, the connection portion to which the power generation device is connected and a plurality of electric paths The U-phase current flowing through the U-phase and the V-phase current flowing through the V-phase in the portion between the branch breaker and the branch breaker become smaller. As a result, it is possible to prevent a large current from continuing to flow in the electric path from the secondary side of the main breaker to the branch breaker.

However, even if the output current of the power generation device is reduced as described above, if the power consumption of the power load connected to the secondary side of the branch breaker increases, the current itself supplied from the power system also increases. , The sum of the current supplied from the power system and the output current of the power generation device, that is, among the electrical paths between the secondary terminal of the main breaker and the plurality of branch breakers, the connection part to which the power generation device is connected and the plurality of The U-phase current flowing through the U-phase or the V-phase current flowing through the V-phase in the portion between the branch breaker and the V-phase can be very large.
Therefore, in this feature configuration, the current control unit is the portion of the electrical path between the secondary terminal of the main breaker and the plurality of branch breakers, between the connection portion to which the power generation device is connected and the plurality of branch breakers. When the U-phase current flowing through the U-phase or the V-phase current flowing through the V-phase becomes greater than or equal to the second set value larger than the first set value, the output current of the power generator is reduced to zero. That is, by setting the output currents of the U-phase and V-phase of the power generation device to zero, among the electrical paths between the secondary side terminals of the main breaker and the plurality of branch breakers, the connection sites to which the power generation device is connected and a plurality of electric paths. The U-phase current and V-phase current flowing through the U-phase in the portion between the branch breaker and the branch breaker are only the current supplied from the power system via the main breaker. As a result, if the operation of the main breaker is normal, it is possible to prevent a large current from continuing to flow in the electric path from the secondary side of the main breaker to the branch breaker.

Another characteristic configuration of the operation control device according to the present invention includes a current detection unit that detects currents flowing in the U phase and V phase of the power line connected to the primary side terminal of the main breaker.
The current control unit determines the U-phase current and the V-phase current from the sum of the current detected by the current detection unit and the output current of the power generation device.

According to the above-mentioned characteristic configuration, the current detection unit detects the current flowing through the U phase and the V phase of the power line connected to the primary side terminal of the main breaker. For example, on the primary side terminal of the main breaker to be used as a detector for detecting the total power consumption in the power receiving equipment or as a detector for detecting the reverse power flow from the power receiving equipment to the power system. If a detector for detecting the current flowing through the U phase and the V phase of the connected power line is provided, the detector can be used as the current detector of the present feature configuration.

Yet another characteristic configuration of the operation control device according to the present invention is the connection portion to which the power generation device is connected among the electric paths between the secondary side terminal of the main breaker and the plurality of branch breakers. The point is that a current detection unit for detecting the U-phase current flowing through the U-phase and the V-phase current flowing through the V-phase is provided in the portion between the branch breakers.

According to the above-mentioned characteristic configuration, of the electric path between the secondary terminal of the main breaker and the plurality of branch breakers, the U-phase flows in the portion between the connection portion to which the power generation device is connected and the plurality of branch breakers. By using the current detection unit for detecting the U-phase current and the V-phase current flowing through the V-phase, the current flowing through the electric path from the secondary side of the main breaker to the branch breaker can be directly detected.

Yet another characteristic configuration of the operation control device according to the present invention is that the power generation device is connected to the secondary terminal of the main breaker.

According to the above characteristic configuration, since the power generation device may be additionally connected to the secondary side terminal of the main breaker, it is used for the electric path between the secondary side terminal of the main breaker and the plurality of branch breakers. There is no need to make changes such as cutting or processing to the electric cable.

A characteristic configuration of the power generation facility according to the present invention for achieving the above object is that the operation control device and the power generation device are provided.

According to the above characteristic configuration, it is possible to provide a power generation facility capable of preventing an overcurrent from continuously flowing in an electric path from the secondary side of the main breaker to the branch breaker.

It is a figure which shows schematicly the distributed power generation system provided with the operation control device and power generation equipment of 1st Embodiment. It is a flowchart explaining the current limiting process performed by a current control unit. It is a figure which shows schematicly the distributed power generation system provided with the operation control device and power generation equipment of 2nd Embodiment. It is a circuit diagram which shows the distributed power generation system. It is a figure which shows schematic the internal structure of a distribution board. It is a figure which shows schematicly the distributed power generation system. It is a figure which shows schematicly the distributed power generation system. It is a circuit diagram which shows the distributed power generation system. It is a circuit diagram which shows the distributed power generation system.

<First Embodiment>
The operation control device according to the first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram schematically showing a distributed power generation system provided with the operation control device and power generation equipment of the first embodiment. In the distributed power generation system shown in the figure, the main breaker 4 in which the primary side terminal 4a is connected to the power system and a plurality of branch breakers 12 (12a, 12a, which are connected to the secondary side terminal 4b of the main breaker 4 12b, 12c, 12d), and the power generator 15 has a U-phase and a U-phase at a predetermined connection in a single-phase three-wire electrical path between the secondary terminal 4b of the main breaker 4 and the plurality of branch breakers 12. It is a power receiving facility connected to the V phase. In addition, FIG. 1 schematically shows the internal structure of the distribution board 11 which is a part of the power receiving equipment.

As shown in FIG. 1, a watt hour meter 2 is connected to a service line 1 drawn from the power system, and a power line 3 connected to the watt hour meter 2 is drawn into the distribution board 11. In the distribution board 11, the main breaker 4, the earth leakage breaker 5, and the plurality of branch breakers 12 as wiring breakers are installed in order when viewed from the upstream side (power system side) of the power line 3. In the case of a single-phase three-wire power receiving facility, the power line 3 is composed of a total of three power lines 3u, 3n, 3v, which are a voltage line U-phase line and a V-phase line and a neutral line N-phase line. Has been done.

The power line 3 connected to the primary side (upstream side) of the main breaker 4 is fastened to the primary side terminal 4a by the screw 9, and the power line 3 connected to the secondary side (downstream side) of the main breaker 4 is connected by the screw 10. It is fastened to the next terminal 4b. Since a 3P2E type is used for the main breaker 4, the continuation of overcurrent in the U phase and the V phase is prevented. That is, when the current flowing through the U phase or the V phase of the main breaker 4 exceeds, for example, 30 A, which is the breaking capacity, the main breaker 4 forcibly cuts off the power line 3 until a predetermined time elapses.

An electric cable is used for the power line 3 between the watt hour meter 2 and the main breaker 4. An electric cable is used for the power line 3 that connects the main breaker 4 and the earth leakage breaker 5, and an electric cable and copper bars 6u, 6n, 6v are used for the power line 3 that connects the earth leakage breaker 5 and each branch breaker 12. It is used.

In the distribution board 11 illustrated in FIG. 1, three copper bars 6u, 6n, 6v corresponding to the power lines 3u, 3n, 3v of each of the U-phase, N-phase, and V-phase are provided, and the copper bars 6u, In 6n and 6v, the crossover bar is fixed by the screw 8 at the screw hole 7.

The power generation device 15 is connected to the secondary terminal 4b of the main breaker 4. Specifically, the wiring 13 connected to the power generation device 15 is connected to the breaker 14, and the wiring 13 connected to the breaker 14 is connected to the secondary terminal 4b of the main breaker 4. The breaker 14 is installed inside the distribution board 11. An electric cable is used for the wiring 13, and the electric cable is fastened to the secondary terminal 4b of the main breaker 4 with a screw 10.

In the present embodiment, the operation control device that controls the operation of the power generation device 15 is among the electric paths between the secondary side terminals 4b of the main breaker 4 and the plurality of branch breakers 12 (12a, 12b, 12c, 12d). The output of the power generation device 15 when the U-phase current flowing through the U-phase or the V-phase current flowing through the V-phase in the portion between the connection portion to which the power generation device 15 is connected and the plurality of branch breakers 12 exceeds the first set value. A current control unit 20 is provided which reduces the current and makes the output current of the power generation device 15 zero when the U-phase current or the V-phase current becomes greater than or equal to the second set value larger than the first set value.

Further, in the present embodiment, the operation control device that controls the operation of the power generation device 15 is the current detection unit 18 that detects the current flowing through the U phase and the V phase of the power line 3 connected to the primary side terminal 4a of the main breaker 4. (18u, 18v). The current detection unit 18 can be realized by using, for example, an instrument transformer (current transformer). Specifically, an electric cable is used for the power line 3 connected to the primary side terminal 4a of the main breaker 4, and the current detection unit 18 connects the power line 3 connected to the primary side terminal 4a of the main breaker 4. Detect the current flowing through the realized electric cable. The detection result of the current detection unit 18 is transmitted to the current control unit 20. Further, in the current control unit 20, the output current of the power generation device 15 (output current to the wiring 13u which is the U-phase line and output current to the wiring 13v which is the V-phase line) from the power generation control unit 15b of the power generation device 15). Is also transmitted. Then, the current control unit 20 determines the U-phase current and the V-phase current from the sum of the current detected by the current detection unit 18 and the output current of the power generation device 15.

The power generation device 15 has a power generation unit 15c realized by various devices such as a fuel cell and an engine and a generator driven by the engine, and a desired voltage and frequency of power generated by such a power generation unit 15c. It has a power conversion unit 15a such as an inverter that converts phase power, and a power generation control unit 15b that controls the operations of the power generation unit 15c and the power conversion unit 15a. The power generation control unit 15b determines a predetermined target output current, and outputs the target output current from the power conversion unit 15a to the breaker 14 and the main breaker 4 via the wiring 13 so that the power generation unit 15c and the main breaker 4 are output. It controls the operation of the power conversion unit 15a.

As described above, the output current of the power generation device 15 is connected to the power generation device 15 among the electric paths between the secondary terminal 4b of the main breaker 4 and the plurality of branch breakers 12 (12a, 12b, 12c, 12d). It flows through the portion between the connection portion to be formed and the plurality of branch breakers 12. In addition, the current supplied from the power system also flows through the main breaker 4 in the same portion. Therefore, the main breaker 4 shuts off when a current larger than the breaking capacity continues to flow, but the secondary side terminal 4b of the main breaker 4 does not have a current exceeding the breaking capacity flowing through the main breaker 4. And, of the electric paths between the plurality of branch breakers 12, the portion between the connection portion to which the power generation device 15 is connected and the plurality of branch breakers 12 has a current exceeding the breaking capacity (current from the power generation device 15). And the current from the power system (the total current) may continue to flow. That is, in the case of the present embodiment, the breaking capacity of the main breaker 4 is the same as the allowable current of the electric cable and the copper bar used in the electric path between the secondary terminal 4b of the main breaker 4 and the branch breaker 12. Or because the values are close to each other, a current exceeding the allowable current may continue to flow through the electric cable and the copper bar.

Therefore, among the electric paths between the secondary terminal 4b of the main breaker 4 and the plurality of branch breakers 12, the current flowing in the portion between the connection portion to which the power generation device 15 is connected and the plurality of branch breakers 12 is transferred. If it is desired to suppress the current to the allowable current or less, the output current of the power generation device 15 may be suppressed as necessary. The current limiting process described below is performed based on this idea.

FIG. 2 is a flowchart illustrating a current limiting process performed by the current control unit 20.
While the power generation device 15 is operating, the current detection unit 18 detects the current flowing through the U phase and the V phase of the power line 3 connected to the primary side terminal 4a of the main breaker 4, and the detection result is the current control unit. It is transmitted to 20. Further, in the current control unit 20, the output current of the power generation device 15 (output current to the wiring 13u which is the U-phase line and output current to the wiring 13v which is the V-phase line) from the power generation control unit 15b of the power generation device 15). Is also transmitted. In step # 10, the current control unit 20 determines the U-phase current and the V-phase current from the sum of the current detected by the current detection unit 18 and the output current of the power generation device 15, and the currents are equal to or higher than the first set value. It is determined whether or not it is. The current control unit 20 stores the first set value in advance. For example, the first set value is 50A, which is the same value as or close to the breaking capacity of the main breaker 4.
Then, if the current is equal to or higher than the first set value (“Yes” in step # 10), the current control unit 20 shifts to step # 11, and if the current is smaller than the first set value (step). In # 10, "No") Step # 10 is repeated.

In step # 11, the current control unit 20 starts timer timing. Next, in step # 12, in the current control unit 20, the U-phase current or the V-phase current determined from the sum of the current detected by the current detection unit 18 and the output current of the power generation device 15 is the first. It is determined whether or not the value is greater than or equal to the second set value larger than the set value of. The current control unit 20 stores the second set value in advance. For example, the second set value is a value such as 60A.
Then, the current control unit 20 shifts to step # 17 if the current is equal to or higher than the second set value, and shifts to step # 13 if the current is smaller than the second set value.

In step # 13, the current control unit 20 determines that the U-phase current or the V-phase current determined from the sum of the current detected by the current detection unit 18 and the output current of the power generation device 15 is the first set value. It is determined again whether or not it is the above. Then, if the U-phase current or the V-phase current is equal to or higher than the first set value, the current control unit 20 shifts to step # 15 to reduce the output current of the power generation device 15. In the power generation device 15, the power generation control unit 15b receives a command for reducing the output current and controls the operation of the power conversion unit 15a and the operation of the power generation unit 15c, so that the output current of the power generation device 15 is reduced. The current control unit 20 commands the power generation device 15 to reduce the output current at a rate of, for example, 75% or 50% of the regular output current, or with a reduction range of 1A or 2A. It can be done in various ways, such as when commanding. If the U-phase current and the V-phase current are smaller than the first set value at the time of step # 13, the current control unit 20 shifts to step # 14 to cancel the timer timing and the original. Return to the output current.

In this way, the output currents of the U-phase and V-phase of the power generation device 15 are reduced by the current limiting process, so that power is generated in the electric path between the secondary terminal 4b of the main breaker 4 and the plurality of branch breakers 12. The U-phase current and V-phase current flowing in the U-phase of the portion between the connection portion to which the device 15 is connected and the plurality of branch breakers 12 become smaller. As a result, it is possible to prevent a large current from continuing to flow in the electric path from the secondary side of the main breaker 4 to the branch breaker 12.

In addition, even after the output current of the power generation device 15 has already been reduced, the current control unit 20 continues timer counting while maintaining the reduced output current (process # 16 → process # 12 → process # 13 →). Step # 15 → Step # 16), when the period during which the output current of the power generation device 15 is reduced reaches a predetermined period, the process proceeds to step # 17.

In step # 17, the current control unit 20 has a U-phase current or a V-phase current determined from the sum of the current detected by the current detection unit 18 and the output current of the power generation device 15 being equal to or higher than the second set value. The output current of the power generation device 15 is set to zero based on the above, that is, based on the determination that the overcurrent is flowing. By setting the output currents of the U-phase and V-phase of the power generation device 15 to zero in this way, the power generation device 15 among the electric paths between the secondary side terminals 4b of the main breaker 4 and the plurality of branch breakers 12 The U-phase current flowing through the U-phase and the V-phase current flowing through the V-phase in the portion between the connected connection portion and the plurality of branch breakers 12 are limited to the current supplied from the power system via the main breaker 4. Become. As a result, if the operation of the main breaker 4 is normal, it is possible to prevent a large current from continuing to flow in the electric path from the secondary side of the main breaker 4 to the branch breaker 12.

In the above description, an example in which the operation control device includes the current detection unit 18 and the current control unit 20 has been described, but the operation control device (current detection unit 18 and current control unit 20) and the power generation device 15 are provided. A power generation facility may be constructed.

<Second Embodiment>
The operation control device of the second embodiment is different from the above-described embodiment in the location where the current is detected by the current detection unit. The operation control device of the second embodiment will be described below, but the description of the same configuration as that of the above embodiment will be omitted.

FIG. 3 is a diagram schematically showing a distributed power generation system provided with the operation control device and power generation equipment of the second embodiment.
In the present embodiment, the operation control device that controls the operation of the power generation device 15 is among the electric paths between the secondary side terminals 4b of the main breaker 4 and the plurality of branch breakers 12 (12a, 12b, 12c, 12d). Current detection unit 19 (19u, 19v) for detecting the U-phase current flowing through the U-phase and the V-phase current flowing through the V-phase in the portion between the connection portion to which the power generation device 15 is connected and the plurality of branch breakers 12. To be equipped. That is, the current detection unit 19 detects the total current of the current from the power generation device 15 and the current from the power system. Then, the current control unit 20 receives the electric path between the secondary terminal 4b of the main breaker 4 and the plurality of branch breakers 12 between the connection portion to which the power generation device 15 is connected and the plurality of branch breakers 12. When the U-phase current flowing through the U-phase or the V-phase current flowing through the V-phase becomes equal to or higher than the first set value, the output current of the power generation device 15 is lowered, and the U-phase current or the V-phase current becomes higher than the first set value. When the value exceeds the second large set value, the current limiting process for reducing the output current of the power generation device 15 to zero is performed.

As described above, in the present embodiment, among the electric paths between the secondary terminal 4b of the main breaker 4 and the plurality of branch breakers 12, between the connection portion to which the power generation device 15 is connected and the plurality of branch breakers 12. By using the current detection unit 19 for detecting the U-phase current flowing through the U-phase and the V-phase current flowing through the V-phase, the electric path from the secondary side of the main breaker 4 to the branch breaker 12 can be established. The flowing current can be detected directly.

Further, also in this embodiment, a power generation facility including the operation control device (current detection unit 19 and current control unit 20) and the power generation device 15 may be constructed.

<Another Embodiment>
<1>
In the above embodiment, the configuration of the operation control device and the power generation facility of the present invention has been described with reference to specific examples, but the configuration can be changed as appropriate.
For example, in the above embodiment, the example in which the power generation device 15 is connected to the secondary side terminal 4b of the main breaker 4 has been described, but the electric path between the secondary side terminal 4b of the main breaker 4 and the plurality of branch breakers 12 The power generation device 15 may be connected to another part in the middle of the above. As an example, the power generation device 15 can be connected to the primary side terminal, the secondary side terminal, or the like of the earth leakage breaker 5.
Further, in the above embodiment, the current value and the like have been described with specific numerical values, but these numerical values are described for the purpose of exemplification and can be changed as appropriate.

<2>
The configurations disclosed in the above embodiment (including other embodiments, the same shall apply hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction, and are disclosed in the present specification. The embodiment is an example, and the embodiment of the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention.

The present invention can be used for an operation control device and a power generation facility capable of preventing an overcurrent from continuously flowing in an electric path from the secondary side of the main breaker to the branch breaker.

4 Main breaker 4a Primary side terminal 4b Secondary side terminal 12 (12a, 12b, 12c, 12d) Branch breaker 15 Power generation device 16 Current control unit 18 Current detection unit 18u Current detection unit 18v Current detection unit 19 Current detection unit 19u Current detection Unit 19v Current detection unit 20 Current control unit

Claims (5)

The main breaker in which the primary side terminal is connected to the power system and a plurality of branch breakers connected to the secondary side terminal of the main breaker are provided, and the secondary side terminal and the plurality of the main breaker are provided. An operation control device that controls the operation of the power generation device in a power receiving facility in which the power generation device is connected to the U phase and the V phase at a predetermined connection portion in a single-phase three-wire electric path between the branch breakers. And
Of the electric path between the secondary terminal of the main breaker and the branch breakers, the U-phase flows between the connection portion to which the power generation device is connected and the branch breakers. When the U-phase current or the V-phase current flowing through the V-phase becomes equal to or higher than the first set value, the output current of the power generator is reduced, and the U-phase current or the V-phase current is larger than the first set value. An operation control device including a current control unit that makes the output current of the power generation device zero when the value exceeds the set value of. A current detection unit for detecting currents flowing through the U phase and V phase of the power line connected to the primary terminal of the main breaker is provided.
The operation control device according to claim 1, wherein the current control unit determines the U-phase current and the V-phase current from the sum of the current detected by the current detection unit and the output current of the power generation device. Of the electric path between the secondary terminal of the main breaker and the branch breakers, the U-phase flows between the connection portion to which the power generation device is connected and the branch breakers. The operation control device according to claim 1, further comprising a current detection unit for detecting the U-phase current and the V-phase current flowing through the V-phase. The operation control device according to any one of claims 1 to 3, wherein the power generation device is connected to the secondary terminal of the main breaker. A power generation facility including the operation control device according to any one of claims 1 to 4 and the power generation device.

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