WO2013015192A1 - 故障診断方法、系統連系装置、及び制御装置 - Google Patents
故障診断方法、系統連系装置、及び制御装置 Download PDFInfo
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- WO2013015192A1 WO2013015192A1 PCT/JP2012/068327 JP2012068327W WO2013015192A1 WO 2013015192 A1 WO2013015192 A1 WO 2013015192A1 JP 2012068327 W JP2012068327 W JP 2012068327W WO 2013015192 A1 WO2013015192 A1 WO 2013015192A1
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- power
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- pcs
- interconnection device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Definitions
- the present invention relates to a failure diagnosis method, a grid interconnection device, and a control device for diagnosing a failure associated with a grid interconnection device to which output power of a solar cell is input.
- the grid interconnection device has a grid interconnection relay for disconnecting the solar cell from the grid (see, for example, Patent Document 1).
- the grid interconnection device When the grid interconnection device detects an abnormality in its own device or solar cell (for example, input overvoltage, output overvoltage, semiconductor component abnormality, etc. of the grid interconnection device), the grid interconnection relay is turned off to remove the solar cell from the grid. The system is disconnected, the system operation is stopped, and error processing (such as error display and buzzer sound output) for notification to the user is performed.
- an abnormality in its own device or solar cell for example, input overvoltage, output overvoltage, semiconductor component abnormality, etc. of the grid interconnection device
- error processing such as error display and buzzer sound output
- an object of the present invention is to provide a failure diagnosis method, a grid interconnection device, and a control device capable of automatically diagnosing a failure related to the grid interconnection device even when the interconnection operation is stopped.
- the present invention has the following features.
- a feature of the failure diagnosis method according to the present invention is that a system configured to perform an interconnection operation in which output power of a distributed power source (for example, PV100) is input and the distributed power source is connected to a system (system 10).
- a fault diagnosis method for diagnosing a fault related to a grid connection device PV PCS150, wherein the grid connection device is stopped when the grid connection device detects an abnormality, and then the distributed power source is linked to the grid.
- Step A in which power is supplied to a predetermined load (storage battery 200, power storage PCS 250) from the independent operation output of the grid interconnection device by independent operation that is not connected, and when power is supplied to the predetermined load in Step A, Step B for measuring the output power state of the distributed power source and / or the grid interconnection device, and when the output power state measured in the step B does not satisfy a predetermined condition, Serial determines that a failure has occurred, is summarized in that with a step C of performing error processing for notifying the user.
- a predetermined load storage battery 200, power storage PCS 250
- the output power state of the distributed power source and / or the grid interconnection device is normal by performing the independent operation.
- a test for verifying whether or not after confirming that the output power state of the distributed power source and / or the grid interconnection device does not satisfy the predetermined condition (that is, not normal), by performing error processing, the interconnection operation is stopped. Even if it exists, the failure which concerns on a grid connection apparatus can be diagnosed automatically.
- Another feature of the failure diagnosis method according to the present invention is that in the above-described feature, when the output power state measured in the step B satisfies the predetermined condition, the autonomous operation is stopped and the interconnection operation is performed.
- the gist of the present invention is to further include a step D for attempting to start the above.
- the predetermined load includes a storage battery having a variable charge amount, and the storage battery charges the power supplied in Step A. Furthermore, it is summarized as having.
- step B changes the output power state of the distributed power source and / or the grid interconnection device while changing the charge amount of the storage battery.
- the gist is to include step B1 for measurement.
- the predetermined load includes the storage battery and another grid interconnection device (power storage PCS 250) capable of linking the storage battery to the grid.
- the other grid interconnection device is connected to the autonomous operation output of the grid interconnection device via a power line (PV autonomous output line PL4), and the step A includes the power from the autonomous operation output.
- the gist is to include step A1 of supplying AC power to the other grid interconnection device via a line.
- the system interconnection device is characterized in that the output power of the distributed power supply is input, and the system is configured to perform the interconnection operation of connecting the distributed power supply to the system and supplying power to the load.
- a supply unit (inverter 151, self-sustained output relay 153, PV controller 154) that supplies power to the predetermined load from the operation output, the distributed power source when supplying power to the predetermined load from the self-sustained operation output, and / or the
- an error processing unit (PV controller 154) that performs error processing for notifying the user Display 157, and summarized in that a speaker 158), a.
- a feature of the control device is that a grid interconnection configured to perform an interconnection operation in which output power of a distributed power supply is input, and the distributed power supply is linked to a grid to supply power to a load.
- a control device HEMS 600 for controlling a device, and after stopping the interconnection operation due to the abnormality detected by the grid interconnection device, the self-sustained operation that does not link the distributed power source to the grid,
- a supply control unit HEMS controller 610, transceiver 620
- controls to supply power to a predetermined load from a self-sustained operation output of the grid interconnection device, and the dispersion when power is supplied from the self-sustained operation output to the predetermined load When the output power state of the type power supply and / or the grid interconnection device does not satisfy a predetermined condition, it is determined that the failure has occurred and control is performed to perform error processing for notifying the user That error processing controller and (HEMS controller 610, transceiver 620), and summarized in that with.
- FIG. 1 is a block diagram of a power control system according to the present embodiment.
- power lines are indicated by bold lines
- communication lines are indicated by broken lines.
- the communication line is not limited to a wired line and may be wireless.
- the power control system provides a solar cell (PV) 100, a PV power conditioner (PV PCS) to consumers who receive an alternating current (AC) power supply from the grid 10 of an electric power company. ) 150, storage battery 200, storage power conditioner (storage PCS) 250, distribution board 300, and one or more loads 400.
- PV solar cell
- PV PCS PV power conditioner
- AC alternating current
- PV100 corresponds to a distributed power source.
- the PV PCS 150 corresponds to a grid interconnection device configured to perform a grid connection operation in which the output power of the PV 100 is input and the PV 100 is linked to the grid 10 and power is supplied to the load 400.
- PV100 receives sunlight and generates power, and outputs direct current (DC) power obtained by power generation to PV PCS150 via PV power line PL1 provided between PV100 and PVPCS150.
- DC direct current
- Storage battery 200 stores electric power.
- Storage battery 200 charges DC power from power storage PCS 250 via power storage power line PL ⁇ b> 2 provided between power storage PCS 250, converts the DC power generated by the discharge into AC power by power storage PCS 250, and distributes power to distribution board 300. Output.
- PV PCS150 converts DC power obtained by power generation of PV100 into AC and outputs it.
- the PV PCS 150 outputs AC power to the distribution board 300 via the PV interconnection output line PL3 provided between the PV PCS 150 and the distribution board 300 during the interconnection operation.
- the PV PCS 150 outputs AC power to the power storage PCS 250 through the PV self-sustained output line PL4 provided between the PV PCS 250 and the power storage PCS 250.
- the PV PCS 150 includes an inverter 151, a grid interconnection relay 152, a self-supporting output relay 153, a PV controller 154, a sensor 155, a sensor 156, a display 157, and a speaker 158.
- the inverter 151 converts DC power output from the PV 100 into AC under the control of the PV controller 154.
- the grid interconnection relay 152 is turned on / off under the control of the PV controller 154.
- the grid interconnection relay 152 is on, the PV 100 is linked to the grid 10, and when the grid interconnection relay 152 is off, the PV 100 is disconnected from the grid 10.
- the interconnection operation is an operation state in which the grid interconnection relay 152 is on and the inverter 151 outputs AC power.
- the independent output relay 153 is turned on / off under the control of the PV controller 154. Independent operation is an operation state in which the independent output relay 153 is on and the inverter 151 outputs AC power.
- the grid interconnection relay 152 and the independent output relay 153 are controlled by the PV controller 154 so that only one of them is turned on.
- the PV controller 154 controls various functions of the PV PCS 150, and is configured using a processor and a memory.
- the PV controller 154 is configured to be able to communicate with the power storage PCS 250 via the communication line CL.
- the PV controller 154 and the power storage controller 253 detect a state where they can communicate with each other, and make a state where control described below can be performed.
- the PV controller 154 is not limited to a configuration that performs direct communication with the power storage controller 253, and may exchange information via a transceiver, a server, or a control device. Further, these pieces of information may be exchanged by wire or wireless.
- the PV controller 154 detects an abnormality of the PV 100 and / or the PV PCS 150 during the interconnection operation, and stops the interconnection operation (specifically, an abnormal stop that turns off the grid interconnection relay 152 and stops the inverter 151). It is configured to perform processing. In addition, the PV controller 154 performs failure diagnosis for diagnosing a failure related to the PV PCS 150 after performing the abnormal stop processing. The failure diagnosis will be described later.
- Sensor 155 is provided on PV power line PL 1, measures the output power state (voltage, current) of PV 100, and outputs the measurement result to PV controller 154.
- Sensor 156 is provided on PV self-supporting output line PL4, measures the output power state (voltage, current) of PV PCS 150, and outputs the measurement result to PV controller 154.
- the sensor 156 may not be provided.
- the display 157 is configured to perform various displays (such as error display) under the control of the PV controller 154.
- the speaker 158 is configured to perform various audio outputs (such as a buzzer sound output) under the control of the PV controller 154.
- both the display 157 and the speaker 158 are used for error processing, but only one of them may be used for error processing.
- the display 157 may be provided outside the PV PCS 150.
- the storage PCS 250 converts AC power (mainly nighttime power) from the grid 10 or AC power from the PV PCS 150 into DC and outputs it to the storage battery 200 during charging.
- the power storage PCS 250 converts DC power obtained by discharging the storage battery 200 into AC, and distributes power through a power storage input / output line PL5 provided between the power distribution panel 300 and the power distribution PCS 250. It outputs to the board 300.
- the power storage PCS 250 includes a bidirectional converter 251, a grid interconnection relay 252, a power storage controller 253, and a sensor 254.
- the bidirectional converter 251 converts DC power output from the storage battery 200 into AC, or converts AC power from the system 10 or AC power from the PV PCS 150 into DC under the control of the storage controller 253.
- the grid interconnection relay 252 is turned on / off under the control of the power storage controller 253. When the grid interconnection relay 252 is in the on state, the storage battery 200 is linked to the grid 10, and when the grid interconnection relay 252 is in the off state, the storage battery 200 is disconnected from the grid 10.
- the power storage controller 253 controls various functions of the power storage PCS 250 and is configured using a processor and a memory.
- the power storage controller 253 is configured to be able to communicate with the PV controller 154 via the communication line CL.
- the power storage controller 253 performs a part of failure diagnosis for diagnosing a failure related to the PV PCS 150 during the self-sustaining operation of the PV PCS 150. The failure diagnosis will be described later.
- the sensor 254 is provided on the PV independent output line PL4, measures the output power state (voltage, current) of the PV PCS 150, and outputs the measurement result to the PV controller 154.
- Distribution board 300 supplies AC power output from PV PCS 150 and AC power output from power storage PCS 250 to load 400.
- the distribution board 300 receives the shortage of AC power from the system 10 via the system power line PL7. Electricity) to supply to the load 400.
- the distribution board 300 reverses the excess AC power to the grid 10 via the grid power line PL7. Tidal current (power sale).
- the reverse power flow by the storage battery 200 power storage PCS 250
- the reverse power flow is limited to the output AC power of the PV PCS 150.
- the load 400 is supplied with AC power through the power supply line PL6 provided between the load 400 and the load 400, and operates by consuming the supplied AC power.
- the load 400 may be one or plural.
- the load 400 is not limited to lighting, or home appliances such as an air conditioner, a refrigerator, and a television, but may include a heat accumulator or the like.
- the failure diagnosis method according to the present embodiment is for diagnosing a failure related to the PV PCS 150 configured to perform the interconnection operation that links the PV 100 to the grid 10.
- the failure diagnosis method first stops the PV 100 after stopping the grid operation due to the PV PCS 150 detecting an abnormality (for example, the PV PCS 150 input overvoltage, output overvoltage, semiconductor component abnormality, etc.). Electric power is supplied from the self-sustained operation output of the PV PCS 150 to the power storage PCS 250 by the self-sustained operation not connected to the grid 10.
- an abnormality for example, the PV PCS 150 input overvoltage, output overvoltage, semiconductor component abnormality, etc.
- the predetermined condition means an output power state (voltage, current, etc.) in which the PV 100 and / or the PV PCS 150 can be regarded as operating normally.
- the failure diagnosis method uses the storage battery 200 as a predetermined load and performs a test for confirming (verifying) whether the PV 100 and / or the PV PCS 150 are operating normally by self-sustained operation. I do.
- FIG. 2 is a flowchart of the failure diagnosis method according to the present embodiment.
- the grid interconnection relay 152 is on and the grid relay 152 is off, and the inverter 151 is operating (running).
- step S101 the PV controller 154 detects an abnormality (for example, an input overvoltage, an output overvoltage, an abnormality in a semiconductor component, etc. of the PV PCS 150) and stops the interconnection operation. Specifically, the grid interconnection relay 152 is turned off and the operation of the inverter 151 is stopped.
- an abnormality for example, an input overvoltage, an output overvoltage, an abnormality in a semiconductor component, etc. of the PV PCS 150
- the grid interconnection relay 152 is turned off and the operation of the inverter 151 is stopped.
- step S102 the PV controller 154 turns on the self-sustained output relay 153 and starts the operation of the inverter 151, thereby starting the self-sustaining operation of the PV PCS 150.
- the AC power output from the inverter 151 is input to the bidirectional converter 251 of the power storage PCS 250 via the independent output relay 153 and the PV independent output line PL4.
- step S103 when the storage controller 253 detects that AC power is supplied via the PV self-supporting output line PL4, the storage controller 253 starts a charging mode for charging the storage battery 200.
- the storage controller 253 may change the charge amount of the storage battery 200 in the charging mode.
- the charge amount is indicated by any one of current, voltage, power, current per unit time, or power.
- the PV controller 154 measures the output current value of the PV 100 when the output voltage value of the PV 100 changes, and measures the product of the output voltage value and the output current value of the PV 100 as the output power amount of the PV 100.
- the PV controller 154 measures the output current value of the PV PCS 150 when the output voltage value of the PV PCS 150 changes, and measures the product of the output voltage value and the output current value of the PV PCS 150 as the output power amount of the PV PCS 150. To do.
- step S104 the PV controller 154 stores the power condition (voltage value, current value, power amount, power value) stored in advance in the power state (voltage value, current value, power amount, power conversion efficiency) measured in step S103. It is confirmed whether the power conversion efficiency matches or substantially matches. If they match or substantially match (step S104; YES), it is determined that the PV 100 and the PV PCS 150 are operating normally, and the process proceeds to step S105. On the other hand, if they match or do not substantially match (step S104; NO), it is determined that the PV 100 and / or PV PCS 150 is not operating normally, and the process proceeds to step S108.
- step S105 the PV controller 154 stops the self-sustaining operation of the PV PCS 150 by turning off the self-sustaining output relay 153.
- step S106 the PV controller 154 shifts to the start state of the interconnected operation.
- step S107 the PV controller 154 attempts to start the interconnection operation by turning on the grid interconnection relay 152 while operating the inverter 151 (retry process).
- step S108 after it is determined that the PV 100 and / or the PV PCS 150 is not operating normally, the PV controller 154 turns off the self-sustained output relay 153 and stops the inverter 151, whereby the PV PCS 150 Stop autonomous operation.
- step S109 the PV controller 154 performs error processing for notifying the user of the failure.
- the PV PCS 150 supplies power to the power storage PCS 250 from the self-sustained operation output of the PV PCS 150 by the self-sustained operation that does not link the PV 100 to the grid 10 after stopping the interconnected operation due to abnormality detection ( Inverter 151, self-sustained output relay 153, PV controller 154), and a failure has occurred when the output power state of PV 100 and / or PV PCS 150 does not satisfy a predetermined condition when power is supplied to power storage PCS 250 from the self-sustained operation output And error processing means (PV controller 154, display 157, speaker 158) for performing error processing for notification to the user.
- abnormality detection Inverter 151, self-sustained output relay 153, PV controller 154
- a test for verifying whether the output power state of the PV 100 and / or the PV PCS 150 is normal can be performed by performing the independent operation after stopping the interconnection operation due to the abnormality detection. Then, after confirming that the output power status of the PV 100 and / or the PV PCS 150 is not normal, by performing error processing, even if the grid operation is stopped, the failure related to the PV PCS 150 is automatically performed. Diagnose with
- the storage battery 200 has a variable charge amount and charges the power supplied from the PV PCS 150.
- the output power state of PV100 and / or PV PCS150 can be confirmed in steps by using storage battery 200 with a variable charge as a predetermined load for the test. And by charging without consuming the electric power obtained during such a test, the electric power can be prevented from being wasted.
- the power control system according to the present embodiment is configured in the same manner as in the first embodiment, but the failure diagnosis method is partially different from that in the first embodiment.
- FIG. 3 is a flowchart of the failure diagnosis method according to the present embodiment. In this flow, since steps other than steps S203 to S205 and S208 are the same as those in the first embodiment, steps S203 to S205 and S208 will be described.
- the power storage controller 253 starts a charging mode for charging the storage battery 200 when detecting that AC power is supplied through the PV self-sustained output line PL4.
- the storage controller 253 may change the charge amount of the storage battery 200 in the charging mode.
- the output voltage value of the PV PCS 150 is also changed.
- the power storage controller 253 measures the output current value of the PV PCS 150 when the output voltage value of the PV PCS 150 changes, and calculates the product of the output voltage value and the output current value of the PV PCS 150 as the output power of the PV PCS 150. Measure as quantity.
- step S204 the power storage controller 253 determines that the power condition (voltage value, current value, power amount, power conversion efficiency) measured in step S203 is stored in advance as power conditions (voltage value, current value, power amount, It is confirmed whether the power conversion efficiency matches or substantially matches. If they match or substantially match (step S204; YES), it is determined that the PV 100 and the PV PCS 150 are operating normally, the fact is notified to the PV controller 154, and the process proceeds to step S205. On the other hand, if they match or do not substantially match (step S204; NO), it is determined that the PV 100 and / or PV PCS 150 is not operating normally, the fact is notified to the PV controller 154, and the process is performed in step S208. Proceed to
- step S205 the PV controller 154 stops the independent operation of the PV PCS 150 by turning off the independent output relay 153 in response to the notification from the power storage controller 253. Thereafter, the PV controller 154 performs a retry process in the same manner as in the first embodiment.
- step S208 the PV controller 154 stops the independent operation of the PV PCS 150 by turning off the independent output relay 153 and stopping the inverter 151 in response to the notification from the power storage controller 253. Thereafter, the PV controller 154 performs error processing as in the first embodiment.
- FIG. 4 is a block diagram of the power control system according to the present embodiment.
- the power control system is different from the first embodiment and the second embodiment in that a HEMS (Home Energy Management System) 600 is provided.
- the HEMS 600 is for performing power management within a consumer.
- the HEMS 600 collects various measurement values by transmitting various control commands to the PV PCS 150, the power storage PCS 250, and the load 400, and collects various measurement values to determine the state of each device in the consumer. It has a function to monitor and display.
- the HEMS 600 corresponds to a control device that controls the PV PCS 150 (system interconnection device).
- the HEMS 600 includes a HEMS controller 610 and a transceiver 620.
- the HEMS controller 610 is configured using a processor and a memory, and controls each device in the consumer using the transceiver 620.
- the transceiver 620 is configured to communicate with each device in the consumer.
- the HEMS 600 performs control for implementing the failure diagnosis method according to the above-described embodiment.
- the operation when the HEMS 600 performs control for executing the failure diagnosis method according to the above-described embodiment will be described with reference to the flowchart of FIG.
- step S101 the HEMS 600 detects an abnormality (for example, an input overvoltage, an output overvoltage, a semiconductor component abnormality, etc. of the PV PCS 150), and controls the PV PCS 150 to stop the interconnection operation.
- an abnormality for example, an input overvoltage, an output overvoltage, a semiconductor component abnormality, etc. of the PV PCS 150
- step S102 the HEMS 600 controls the PV PCS 150 so as to start the independent operation.
- the AC power output from the inverter 151 is input to the bidirectional converter 251 of the power storage PCS 250 via the independent output relay 153 and the PV independent output line PL4.
- step S103 when the HEMS 600 detects that AC power is supplied via the PV self-sustained output line PL4, the HEMS 600 controls the power storage PCS 250 to start a charging mode for charging the storage battery 200.
- the HEMS 600 changes the charge amount of the storage battery 200 in the charge mode.
- the output voltage values of the PV 100 and the PV PCS 150 are also changed.
- the HEMS 600 measures the output current value of the PV 100 when the output voltage value of the PV 100 changes, and measures the product of the output voltage value and the output current value of the PV 100 as the output power amount of the PV 100.
- the HEMS 600 measures the output current value of the PV PCS 150 when the output voltage value of the PV PCS 150 changes, and measures the product of the output voltage value and the output current value of the PV PCS 150 as the output power amount of the PV PCS 150.
- step S104 the HEMS 600 determines that the power state (voltage value, current value, power amount, power change efficiency) measured in step S103 is stored in advance as power conditions (voltage value, current value, power amount, power change). Efficiency) is confirmed. If they match or substantially match (step S104; YES), it is determined that the PV 100 and the PV PCS 150 are operating normally, and the process proceeds to step S105. On the other hand, if they match or do not substantially match (step S104; NO), it is determined that the PV 100 and / or PV PCS 150 is not operating normally, and the process proceeds to step S108.
- step S104 YES
- step S105 the HEMS 600 controls the PV PCS 150 to stop the independent operation.
- step S106 the HEMS 600 controls the PV PCS 150 so as to shift to the start state of the interconnected operation.
- step S107 the HEMS 600 controls the PV PCS 150 so as to try to start the interconnection operation.
- step S108 after it is determined that the PV 100 and / or the PV PCS 150 is not operating normally, the HEMS 600 controls the PV PCS 150 to stop the independent operation.
- step S109 the HEMS 600 controls the PV PCS 150 to perform error processing for notifying the user of the failure.
- a display (not shown) or a speaker (not shown) provided in the HEMS 600 may be used to control the display or the speaker so that the HEMS 600 itself performs error processing.
- the HEMS 600 from the autonomous operation output of the PV PCS 150 by the autonomous operation that does not link the PV 100 to the grid 10 after stopping the interconnection operation due to the PV PCS 150 detecting an abnormality.
- Supply control means HEMS controller 610, transceiver 620 for controlling power to be supplied to a predetermined load, and the output power state of PV 100 and / or PV PCS 150 when power is supplied to power storage PCS 250 from a self-sustained operation output is a predetermined condition If the above condition is not satisfied, it is determined that a failure has occurred, and error processing control means (HEMS controller 610, transceiver 620) for controlling to perform error processing for notification to the user is included. Accordingly, the failure diagnosis method can be implemented even in a configuration in which no communication line is provided between the PV PCS 150 and the power storage PCS 250.
- DC power may be supplied from the PV PCS 150 to the power storage PCS 250.
- a DC / DC converter (not shown) provided between the PV 100 and the inverter 151 is connected to the self-sustained output relay 153, and the self-sustained output relay 153, the storage battery 200, and the bidirectional converter 251 are connected. What is necessary is just to connect the DC / DC converter (not shown) provided between them by PV independent output line PL4.
- the storage battery 200 (and the storage PCS 250) is used as a predetermined load.
- a load with variable power consumption may be used instead of the storage battery 200 (and the storage PCS 250).
- PV has been described as an example of a distributed power source.
- a solid oxide fuel cell SOFC
- SOFC solid oxide fuel cell
- the present invention is useful in the electric power field because it can automatically diagnose a failure related to the grid interconnection device even when the grid operation is stopped.
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Abstract
Description
図1は、本実施形態に係る電力制御システムのブロック図である。以下のブロック図において、電力ラインは太線で示し、通信ライン(信号ライン)は破線で示している。なお、通信ラインは有線に限らず無線であってもよい。
以下、第2実施形態について、第1実施形態との相違点を説明する。
以下、第3実施形態について、第1実施形態及び第2実施形態との相違点を説明する。図4は、本実施形態に係る電力制御システムのブロック図である。
上記のように、本発明は各実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。
Claims (7)
- 分散型電源の出力電力が入力され、前記分散型電源を系統に連系する連系運転を行うように構成された系統連系装置に係る故障を診断する故障診断方法であって、
前記系統連系装置が異常を検知したことにより前記連系運転を停止した後、前記分散型電源を前記系統に連系しない自立運転によって、前記系統連系装置の自立運転出力から所定負荷に電力を供給するステップAと、
前記ステップAで前記所定負荷に電力が供給される際に、前記分散型電源及び/又は前記系統連系装置の出力電力状態を計測するステップBと、
前記ステップBで計測された前記出力電力状態が所定条件を満たさない場合に、前記故障が発生したと判定して、ユーザへの通知のためのエラー処理を行うステップCと、
を有することを特徴とする故障診断方法。 - 前記ステップBで計測された前記出力電力状態が前記所定条件を満たす場合に、前記自立運転を停止して、前記連系運転の開始を試みるステップDをさらに有することを特徴とする請求項1に記載の故障診断方法。
- 前記所定負荷は、充電量が可変の蓄電池を含み、
前記蓄電池が、前記ステップAで供給される電力を充電するステップDをさらに有することを特徴とする請求項1に記載の故障診断方法。 - 前記ステップBは、前記蓄電池の充電量を変化させながら、前記分散型電源及び/又は前記系統連系装置の出力電力状態を計測するステップB1を含むことを特徴とする請求項3に記載の故障診断方法。
- 前記所定負荷は、
前記蓄電池と、
前記蓄電池を前記系統に連系可能な他の系統連系装置と、を含み、
前記系統連系装置の前記自立運転出力には、電力ラインを介して前記他の系統連系装置が接続され、
前記ステップAは、前記自立運転出力から前記電力ラインを介して前記他の系統連系装置に交流電力を供給するステップA1を含むことを特徴とする請求項3に記載の故障診断方法。 - 分散型電源の出力電力が入力され、前記分散型電源を系統に連系して負荷に電力を供給する連系運転を行うように構成された系統連系装置であって、
前記系統連系装置が異常を検知したことにより前記連系運転を停止した後、前記分散型電源を前記系統に連系しない自立運転によって、前記系統連系装置の自立運転出力から所定負荷に電力を供給する供給部と、
前記自立運転出力から前記所定負荷に電力を供給する際の前記分散型電源及び/又は前記系統連系装置の出力電力状態が所定条件を満たさない場合に、前記故障が発生したと判定して、ユーザへの通知のためのエラー処理を行うエラー処理部と、
を有することを特徴とする系統連系装置。 - 分散型電源の出力電力が入力され、前記分散型電源を系統に連系して負荷に電力を供給する連系運転を行うように構成された系統連系装置を制御する制御装置であって、
前記系統連系装置が異常を検知したことにより前記連系運転を停止した後、前記分散型電源を前記系統に連系しない自立運転によって、前記系統連系装置の自立運転出力から所定負荷に電力を供給するよう制御する供給制御部と、
前記自立運転出力から前記所定負荷に電力を供給する際の前記分散型電源及び/又は前記系統連系装置の出力電力状態が所定条件を満たさない場合に、前記故障が発生したと判定して、ユーザへの通知のためのエラー処理を行うよう制御するエラー処理制御部と、
を有することを特徴とする制御装置。
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