JP5431391B2 - Transfer interruption system for distributed power supply and settling value processing device - Google Patents

Description

  The present invention relates to a setting value setting function of a protective relay using a transfer interrupting device in a distributed power transfer interrupting system.

  Due to the recent eco-boom, subsidy system to support the introduction of power generation equipment, surplus power purchase system, etc., solar power generation equipment, wind power generation equipment and power storage equipment (hereinafter referred to as “power generation equipment”) are spreading. Many power generation facilities are being installed.

  When generating power by connecting the power generation equipment to the power grid, it is based on the “Grid Grid Technical Requirements Guidelines for Ensuring Power Quality” established by the Agency for Natural Resources and Energy and the “Grid Grid Regulations” to supplement those guidelines. Power plant owners or managers (hereinafter referred to as “customers”) and power system managers (hereinafter referred to as “system managers”) conduct prior consultations on power quality and safety measures, and are necessary. Is required to confirm that appropriate measures have been taken.

  One necessary measure is the installation and management of protective relays. Protective relays have a control function that detects short-circuit faults, etc., and disconnects the failure section from the power system. Customers are required to manage the protective relays appropriately in the future. It is desirable that the management status of relays is confirmed from time to time by the system administrator.

JP 2003-70152 A

Therefore, in the past, matters relating to protective relays have been described in contracts (for example, contract outlines related to surplus power receipt from solar power generation) exchanged between customers and system managers. Since the system administrator does not have a mechanism for monitoring or setting the set values such as the voltage and current at which the protective relay operates, from a remote location, the following problems arise.
(1) If a large number of power generation facilities are connected, the voltage rise will increase, and the automatic voltage adjustment function will work in each power generation facility. At that time, the customer has arbitrarily changed the set value to be advantageous for power sales. However, the system administrator cannot grasp this, and there is a risk that it may lead to a third party's disadvantage (voltage rise, power sale suppression, etc.).
(2) Even if a set value other than the agreed value is set due to erroneous input, etc., the system administrator cannot grasp it and the safety of the power system is not guaranteed.
(3) When it is necessary to change the setting value of the protective relay due to a change in the configuration of the power system, etc., it is necessary to go to the site, and work related to the setting change of the setting value is required.
In Patent Document 1, when the series reactor or the tap of the furnace transformer is changed, the set value corresponding to the changed tap is changed to the protective relay to prevent the occurrence of an accident. Although the device is disclosed, it does not confirm the set value currently set in the protective relay.

  This invention is made | formed in view of the said subject, The main objective is to perform setting and management of the set value of a protective relay smoothly.

In order to solve the above problems, the present invention provides a master station that transmits a transfer cutoff signal of a distributed power source, and a slave station that receives the transfer cutoff signal from the master station and shuts off the distributed power source from a power system. A distributed power supply transfer cut-off system comprising: a protection relay that cuts off the distributed power supply from the power system when the slave station detects an abnormality in the power system or the distributed power supply Means for obtaining a set value that is a set value that has been set, and means for changing the set value, wherein the master station stores an appropriate value that is a set value to be set in the protection relay And an instruction to change the setting value of the protective relay to the appropriate value when the stored appropriate value is different from the stored appropriate value and the means for acquiring the set value from the slave station. It means for transmitting to the station, the set An instruction to change the value to the appropriate value after transmitting the slave station, if the proper value was the storage, and the setting value acquired again different, and means for transmitting the transfer trip signal to said slave station, It is characterized by providing.
According to this configuration, the master station reads the set value set in the protective relay through the slave station, and if the set value is incorrect, the correct set value (appropriate value. For example, by a customer or a system administrator. By writing (agreement value) in the protective relay, setting and management of the set value of the protective relay can be performed smoothly. According to this, even if the customer changes the set value of the protective relay without permission, the system administrator should monitor the set value of the protective relay under its control at any time and reset it to the correct set value as necessary. Can do.

The present invention also provides a distributed power source comprising a master station that transmits a transfer cutoff signal of a distributed power source, and a slave station that receives the transfer cutoff signal from the master station and shuts off the distributed power source from a power system. A settling value set in a protective relay that shuts off the distributed power source from the power system when the slave station detects an abnormality in the power system or the distributed power source. Means for changing a set value, and the master station obtains an appropriate value, which is a set value to be set for each of the subordinate protection relays, and stores it for each protection relay, and each protection relay means for transmitting an instruction to change the setting value to the appropriate value collectively to each slave station, characterized in that it comprises, means for transmitting the appropriate value to the device for each customer.
According to this configuration, when a master station obtains a new appropriate value as a set value for the protective relay in response to a predetermined situation change (for example, a change in the configuration of the power system, etc.), the master station sets an appropriate value through the slave station. Since it sets to a protection relay and a new appropriate value is notified to a customer's contact information, the setting value and management of a protection relay can be performed smoothly. For example, when the number of photovoltaic power generation systems connected to the power system increases and it becomes necessary to change the set value set for each protection relay, the setting is not changed individually at each customer's house. By making it possible to change the setting values of the protective relays under the control of all at once, it is possible to save work by local maintenance personnel. Moreover, since the set value may change depending on the configuration change of the distribution line, it is meaningful to notify the consumer each time.

Further, the present invention provides a protective relay that outputs a cut-off signal instructing opening to a switch connected between the power system and the distributed power source when it is determined that the power system or the distributed power source is abnormal A set value processing device that performs processing related to the set value of the power system, from a device of the power system manager, the first connection state in which the protective relay, the power system measuring instrument and the switch are connected, or, said protection relay, a switching data receiving means for receiving the switching data indicating the second connection state and the setting value processing device is connected, based on the switching data to which the switching data received by the receiving means, before Symbol first connection state, or, a switching means for switching the pre-Symbol second connection state, the apparatus manager of the power system, showing the output processing of the setpoint, or to change process and change its said setpoint Power set value And processing data receiving means for receiving processed data indicated, the state is switched to the second connection state by the switching means, based on the processing data to which the processing data received by the receiving means, a signal for instructing the output of the setpoint Or output a signal instructing change to the settling value to be changed to the protection relay, and then obtaining the instructed output or change result from the protection relay, and an apparatus of the power system manager And a return means for switching to the first connection state by the switching means after finishing the processing by the set value processing means.
According to this configuration, the protective relay connected to the measuring instrument and the switch at normal times is connected to the processing device at the time of settling value processing, and the processing device issues an output instruction or change instruction for the settling value to the protective relay, Obtain the result from the protective relay and send it to the system administrator's device, without bothering manpower and without affecting the interconnection of the power system and the distributed power supply. Can be processed. On the other hand, the system administrator's device can obtain the settling value currently set in the protective relay through the processing device, and determines whether the settling value is correct. Can be set as a protective relay. In addition, the system manager's device can unconditionally change the set value set in the protective relay.

  According to this, setting and management of the set value of the protective relay can be performed smoothly. In addition, the correct settling value is an agreement value agreed between a customer or a system manager, a calculated value according to a configuration change of the power system, or the like.

Moreover, in the set value processing apparatus of the present invention, the protection relay may be processed when an instruction for the protection relay processing is acquired from a device of the power system manager.
According to this configuration, the system administrator can instruct the set value processing of the protective relay at an arbitrary timing.

Moreover, in the set value processing apparatus of the present invention, a process schedule of the protection relay may be stored, and the process of the protection relay may be performed according to the schedule.
According to this configuration, the customer (customer) can perform the set value processing of the protective relay according to the processing schedule by setting the processing schedule in the processing device in advance.

Moreover, in the set value processing apparatus of the present invention, the protection relay may be processed when an instruction for the protection relay processing is obtained by an operation of a field worker.
According to this configuration, the local worker can instruct the set value processing of the protective relay at an arbitrary timing.

  In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the description of the mode for carrying out the invention and the drawings.

  ADVANTAGE OF THE INVENTION According to this invention, the setting value and management of a protective relay can be performed smoothly.

It is a figure which shows the structure of the transfer interruption | blocking system 1 for distributed power supplies. 1 is a diagram illustrating a configuration of a transfer cutoff signal transmission device (master station) 3. FIG. It is a figure which shows the structure of the power conditioner 5 and its periphery. 3 is a diagram showing a configuration of a slave station 9. FIG. It is a figure which shows the structure of the data memorize | stored in the memory | storage part of each apparatus, (a) shows the structure of the customer information 35A memorize | stored in the memory | storage part 35 of the master station 3, (b) is the memory | storage of the slave station 9 The structure of the slave station information 94A stored in the unit 94 is shown. It is a figure which shows the format of the data transmitted / received between the main | base station 3 and the sub_station | mobile_unit 9, (a) shows the format of switch change data for a change, (b) shows the format of settling value process data. . 5 is a flowchart showing a confirmation and change process of a set value of the master station 3. It is a flowchart which shows the data reception process of the sub_station | mobile_unit 9.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The settling value processing apparatus (slave station) according to the embodiment of the present invention receives an instruction from the system manager side apparatus (master station), and acquires and changes the settling value set in the protective relay. It has a function and transmits a set value read signal and a write signal to the protective relay and obtains the result. The master station grasps the set value of the protective relay connected to each distributed power source through the slave station, and forcibly changes the setting as necessary. In other words, in the embodiment of the present invention, processing related to the set value of the interconnection protection relay is performed from the outside by utilizing a distributed power transfer interruption system including a master station and a slave station. The set value is determined for each protection relay, and is set by discussion between the customer who is the power generation facility installer and the system administrator. As a specific settling value, a voltage value, a frequency, a current value, an impedance, and the like are set.

  According to the above, the set value set in the protective relay can be monitored and inspected at any time, and an arbitrary change of the set value by an individual can be prevented. According to this, it is possible to reduce the burden on both the customer and the system manager when operating the protective relay, and it is possible to ensure the safety of the power system and, in turn, the public benefit.

≪System configuration and overview≫
FIG. 1 is a diagram showing a configuration of a distributed power transfer cutoff system 1. The distributed power transfer interruption system 1 includes a distribution automation system 2, a transfer interruption signal transmission device (hereinafter referred to as "master station") 3, a transfer interruption signal relay device (hereinafter referred to as "relay station") 4, a power conditioner. 5 and a distributed power source 6. The relay station 4 is provided on the utility pole, and the power conditioner 5 is provided in the customer (electric power consumer) 's house, and they are communicably connected via a service line.

  The distribution automation system 2 manages the state of the power system and transmits power system information to the master station 3 in real time. The master station 3 acquires and stores power system information in advance. Then, when a power system accident occurs, CB (Circuit Breaker) / Ry (Relay: protection relay) information is acquired, and based on the acquired CB / Ry information and stored power system information, a power failure The distributed power source 6 connected to the section of the distributed power line is specified, and a transfer cut-off signal (disconnection request) including the number of the specified distributed power source 6 is sent to the relay station under its control via the IP network 7 4 to send. The relay station 4 stores the number of the distributed power source 6 under its control. When the transfer cutoff signal is received from the master station 3 via the IP network 7, the number of the distributed power source 6 under the relay station 4 is added to the number of the distributed power source 6 to be blocked included in the transfer cutoff signal. Is included, a transfer interruption signal is transmitted to the subordinate power conditioner 5 by PLC (Power Line Communication) using a lead-in line.

  The power conditioner 5 has a function of converting DC power generated by the distributed power supply 6 into household AC power, and receives a transfer cut-off signal from the relay station 4 by a low-speed PLC on the lead-in line, or itself Has a function of detecting a system abnormality and disconnecting the distributed power source 6 from the power system by a built-in switch. The distributed power source 6 is a private power source such as a solar power generator or a wind power generator installed at a customer's home, and is connected to the power system via the power conditioner 5.

  Note that not only the transfer cut-off signal but also data related to the set value processing of the interconnection protection relay built in the power conditioner 5 is transmitted and received between the master station 3 and the power conditioner 5 via the relay station 4. The

FIG. 2 is a diagram showing a configuration of the transfer cutoff signal transmission device (master station) 3. The master station 3 includes a communication unit 31, a display unit 32, an input unit 33, a processing unit 34, and a storage unit 35, and is configured so that each unit can transmit and receive data via the bus 36. The communication unit 31 is a part that communicates with the distribution automation system 2 and the relay station 4 via a communication line (including the IP network 7), and is realized by a NIC (Network Interface Card) or the like. The display unit 32 is a part that displays data according to an instruction from the processing unit 34, and is realized by, for example, a liquid crystal display (LCD). The input unit 33 is a part where an operator inputs data, and is realized by a keyboard, a mouse, or the like. The processing unit 34 exchanges data between the units and controls the entire master station 3. The processing unit 34 is realized by a CPU (Central Processing Unit) executing a program stored in a predetermined memory. The The storage unit 35 stores data from the processing unit 34 and reads the stored data, and is realized by a nonvolatile storage device such as a flash memory or a hard disk device.
The distribution automation system 2 and the relay station 4 have the same configuration as the master station 3 in FIG.

  FIG. 3 is a diagram showing the configuration of the power conditioner 5 and its periphery. The power conditioner 5 includes an inverter 51 and a switch 52 as an electric main circuit unit, and includes an inverter control circuit 53, a connection protection relay 54, and a slave station 9 as a control circuit unit. The inverter 51 is a device that converts DC power from the distributed power source 6 into AC power, and the converted AC power is supplied to the distribution board 8 via the switch 52. The switch 52 is a switch for causing the distributed power source 6 to be parallel or disconnected from the power system. The switch 52 is connected between the inverter 51 and the distribution board 8 and normally the distributed power source 6 is connected in a closed state. In parallel, when an abnormality in the power system is detected, the distributed power source 6 is disconnected due to an open circuit state.

  The inverter control circuit 53 performs various controls related to the inverter 51 (voltage, current, frequency, maximum power point tracking [MPPT, Maximum Power Point Tracking], single operation detection, voltage rise prevention, sequence, etc.) and abnormalities in the power system. Is detected, the system abnormality information is transmitted to the interconnection protection relay 54. The interconnection protection relay 54 acquires voltage, current, frequency, etc. (system data) of the power system from a measuring instrument (not shown) provided on the power line, and outputs a trip signal when an abnormality is detected. Thus, the distributed power source 6 is disconnected from the power system. A trip signal is also output when system abnormality information is received through the inverter control circuit 53 or when a failure of the distributed power source 6 is detected. Further, the interconnection protection relay 54 outputs and changes the set value according to an instruction from the slave station 9 and outputs a processing result.

  In accordance with the data received from the master station 3 via the relay station 4, the slave station 9 outputs a set value output instruction and change instruction to the interconnection protection relay 54, and interrupts the transfer of the distributed power supply 6 (for the distributed power supply). Function as a transfer blocking device in the transfer blocking system), and is connected to magnet switches MGS1 and MGS2 and terminals T2 and T4. By outputting a transfer cut-off signal to the magnet switch MGS1, the switch 52 is opened, and the distributed power supply 6 is disconnected. For the magnet switch MGS2, a change switch switching signal is output, so that the change switches SW1 and SW2 and the respective terminals are changed according to the normal time and when the set value of the interconnection protection relay 54 is changed. Switch connection.

  The change switch SW1 is a switch for switching a transmission source of a signal input to the interconnection protection relay 54. Of the terminals whose connection is switched, the terminal T1 is connected to a power line measuring instrument (not shown), and the terminal T2 Is connected to the slave station 9. On the other hand, the change switch SW2 is a switch for switching the destination of the signal output from the interconnection protection relay 54. Of the terminals whose connection is switched, the terminal T3 is connected to the magnet switch MGS1, and the terminal T4 is connected to the slave station 9. Connected.

  Normally, the change switch SW1 is connected to the terminal T1, and the change switch SW2 is connected to the terminal T3. As a result, the interconnection protection relay 54 acquires the system data from the power line and outputs a transfer cutoff signal to the magnet switch MGS1 as a trip signal when an abnormality in the power system is detected, thereby opening the switch 52. The distributed power source 6 is disconnected. On the other hand, when the set value is changed, the change switch SW1 is connected to the terminal T2, and the change switch SW2 is connected to the terminal T4. As a result, the interconnection protection relay 54 obtains a setting value output instruction or a change instruction (including an agreement value or a change value) from the slave station 9, performs a process according to the instruction, and trips the set value or the processing result. The signal is output to the slave station 9 as a signal.

  FIG. 4 is a diagram showing the configuration of the slave station 9. The slave station 9 includes a communication unit 91, a signal input / output unit 92, a processing unit 93, and a storage unit 94, and is configured so that each unit can transmit and receive data via the bus 95. The communication unit 91 is a part that communicates with the relay station 4 by PLC, and is realized by a PLC modem or the like. The signal input / output unit 92 outputs signals to the magnet switches MGS1 and MGS2 and the terminal T2 shown in FIG. 3 and acquires signals from the terminal T4. The processing unit 93 exchanges data between the units and controls the slave station 9 as a whole. The processing unit 93 is realized by the CPU executing a program stored in a predetermined memory. The storage unit 94 stores data from the processing unit 93 and reads the stored data, and is realized by a non-volatile storage device such as a flash memory or a hard disk device.

<< Data structure >>
FIG. 5 is a diagram illustrating a configuration of data stored in the storage unit of each device. FIG. 5A shows the configuration of customer information 35 </ b> A stored in the storage unit 35 of the master station 3. The customer information 35A is information relating to the customer's home under the master station 3, and includes a record including a distributed power supply number 35A1, a customer contact information 35A2, an agreement set value 35A3, a set set value 35A4, and a processing result 35A5. The distributed power supply number 35A1 is a number unique to the distributed power supply 6 connected to the subordinate of the master station 3, and is set as data transmitted from the master station 3 to the slave station 9. The customer contact information 35A2 is a contact information of a customer (customer) who manages the distributed power supply 6 with the distributed power supply number 35A1, and for example, an address, a telephone number, an email address, etc. are set, and the processing result 35A5 is notified. Used as contact information. The agreement set value 35A3 is a set value of the interconnection protection relay 54 agreed by the customer or the system administrator. The set set value 35A4 is a set value of the interconnection protection relay 54 that is actually set. The processing result 35A5 is a result of the processing in the slave station 9, and is notified to the customer contact 35A2 when it is abnormal.

  FIG. 5B shows the configuration of the slave station information 94 </ b> A stored in the storage unit 94 of the slave station 9. The slave station information 94A is information related to the slave station 9, and includes a distributed power supply number 94A1, a relay connection mode 94A2, a processing result 94A3, and a set value 94A4. The distributed power supply number 94A1 is a number unique to the distributed power supply 6 connected to the power conditioner 5 incorporating the slave station 9, and is matched with the distributed power supply number of the data received from the master station 3. Sometimes processing according to the received data is performed. The relay connection mode 94A2 indicates a connection state of the change switches SW1 and SW2 of the interconnection protection relay 54, and a normal mode (first connection state) or a set value change mode (second connection state) is set. The normal mode is the normal connection state (the change switch SW1 is connected to the terminal T1 and the change switch SW2 is connected to the terminal T3) described with reference to FIG. 3, and the connection protection relay 54 is normal. Perform the operation. On the other hand, the set value change mode is the connection state (the change switch SW1 is connected to the terminal T2 and the change switch SW2 is connected to the terminal T4) when the set value is changed as described in FIG. The system protection relay 54 can be processed by an instruction from the slave station 9. The processing result 94A3 indicates the result of the data reception processing of the slave station 9. The set value 94A4 indicates the set value set in the interconnection protection relay 54.

  FIG. 6 is a diagram illustrating a format of data transmitted / received between the master station 3 and the slave station 9. FIG. 6A shows a format of change switch switching data. When the master station 3 instructs the slave station 9 to switch the switches SW1 and SW2 for changing the power conditioner 5, and when the slave station 9 notifies the master station 3 of the result. Used. The packet length is the size of the data, and “20 bytes” is set as a fixed length. The distributed power supply number is the number of the distributed power supply 6 connected to the power conditioner 5 including the interconnection protection relay 54 that is the target of settling value processing. The T flag is “1” when the set value is changed, and is “0” during normal operation. As the packet type, “31h” indicating a selection control command (one behavior) is set. The C flag and serial number are fixed to 0. The control code indicates a switching code of the change switch, and is set to “03h” indicating switching to the normal mode or “05h” indicating switching to the set value change mode. The control response result indicates the switching result of the change switch, and is set to “FFh” indicating normal operation or “0Fh” indicating malfunction. The transmission time (day, hour, minute, second) indicates the time when the data is transmitted from the master station 3 or the slave station 9, and one decimal digit is set for each byte.

  FIG. 6B shows the format of the set value processing data. When the master station 3 instructs the slave station 9 to perform processing related to the set value of the interconnection protection relay 54, and when the slave station 9 notifies the master station 3 of the result. Used. The packet length is the size of the data, and “24 bytes” is set as a fixed length. The distributed power supply number is the number of the distributed power supply 6 connected to the power conditioner 5 including the interconnection protection relay 54 that is the target of settling value processing. The T flag is set to “1” indicating the settling value processing time. As the packet type, “35h” indicating settling value processing is set. The C flag is fixed to 0. The process type indicates the type of process related to the settling value, and is set to “01h” indicating output or “02h” indicating change. The process response indicates the result of the process and is set to a value equal to or greater than “01h” indicating that the relay operation is normal or “00h” indicating that the relay operation is abnormal. The changed set value is a set value that is set by the master station 3 and should be reflected in the interconnection protection relay 54 when the process type is “02h” indicating change. The set set value is a set value actually stored in the interconnection protection relay 54 set by the slave station 9 when the processing type is “01h” indicating output. The change set value and the set set value are set as binary numbers because they are digital relays. The transmission time (year, month, day, hour, minute) indicates the time when the data is transmitted from the master station 3 or the slave station 9, and one decimal digit is set for each byte.

≪System processing≫
7 and 8 are flowcharts showing the processing of the distributed power supply transfer cutoff system 1. FIG. FIG. 7 shows the confirmation and change processing of the set value of the interconnection protection relay 54 by the master station 3. In the master station 3, in the master station 3, the processing unit 34 mainly refers to and updates the data in the storage unit 35 in response to an instruction from the input unit 33 by the operation of the system administrator, while the communication unit 31 performs the IP network 7. The setting value is confirmed and changed to the slave station 9 via the relay station 4.

  First, the master station 3 transmits change switch switching data to the slave station 9 in order to switch the interconnection protection relay 54 to the set value change mode (S701). At that time, the change switch switching data shown in FIG. 6A is set in a predetermined memory. Specifically, one of the distributed power supply numbers 35A1 in the customer information 35A in the storage unit 35 is set as the distributed power supply number. Next, “1” indicating the set value processing time is set in the T flag, and “05h” indicating the switching to the set value change mode is set in the control code. Then, the current date and time are set as the transmission time. Note that the fixed value of the changeover switch switching data is set in advance. Subsequently, change switch switching data is received as a switching result from the slave station 9, the control response result is stored as a processing result 35A5 (S702), and whether or not the control response result is “FFh” indicating normal operation. Is determined (S703).

  If the control response result is “FFh”, that is, if the switching result is normal (Y in S703), the master station 3 sets the set value processing data in order to obtain the set value set in the interconnection protection relay 54. Is transmitted to the slave station 9 (S704). At that time, settling value processing data shown in FIG. 6B is set on a predetermined memory. Specifically, the distributed power supply number set in the change switch switching data in S701 is set as the distributed power supply number. Next, “01h” indicating the output of the set value is set as the processing type. Then, the current date and time are set as the transmission time. It is assumed that the fixed value of the set value processing data is set in advance. Subsequently, settling value processing data is received from the slave station 9 as a processing result, a processing response is stored as a processing result 35A5 (S705), and whether or not the processing response is equal to or greater than “01h” indicating normal operation of the relay. Is determined (S706).

  If the processing response is “01h” or more, that is, if the processing result is normal (Y in S706), the master station 3 stores the set set value of the set value processing data as the set set value 35A4, and the set set value 35A4. And the agreement set value 35A3 is determined (S707). If they match (Y in S707), it is not necessary to change the settling value, so the processing of S708 to S710 is skipped.

  If they do not match (N in S707), the master station 3 transmits the set value processing data to the slave station 9 in order to change the set value set in the interconnection protection relay 54 to the agreed value (S708). . At that time, settling value processing data shown in FIG. 6B is set on a predetermined memory. Specifically, the distributed power supply number set in the set value processing data in S704 is set as the distributed power supply number. Next, “02h” indicating the change of the setting value is set as the processing type, and the agreement setting value 35A3 is set as the changed setting value. Then, the current date and time are set as the transmission time. It is assumed that the fixed value of the set value processing data is set in advance. Subsequently, settling value processing data is received from the slave station 9 as a processing result, a processing response is stored as a processing result 35A5 (S709), and whether or not the processing response is equal to or greater than “01h” indicating normal operation of the relay. Is determined (S710).

  If it is normal (Y in S710), the settling value is correctly set for the interconnection protection relay 54, and the master station 3 stores the settling value of the setpoint processing data as the settling value 35A4. The change switch switching data is transmitted to the slave station 9 in order to store in the unit 35 and to switch the interconnection protection relay 54 to the normal mode (S711). At that time, the change switch switching data shown in FIG. 6A is set in a predetermined memory. Specifically, the distributed power supply number set in the set value processing data in S704 is set as the distributed power supply number. Next, “0” indicating normal time is set in the T flag, and “03h” indicating switching to the normal mode is set in the control code. Then, the current date and time are set as the transmission time. Note that the fixed value of the changeover switch switching data is set in advance. Subsequently, the switch switching data for change is received from the slave station 9 as a switching result, the control response result is stored as a processing result 35A5 (S712), and whether or not the control response result is “FFh” indicating normal operation. Is determined (S713).

  If the control response result is “FFh”, that is, if the switching result is normal (Y in S713), the master station 3 terminates the processing regarding the settling value.

  If the result of switching to the set value change mode is not normal in S703 (N in S703), if the result of the set value output is not normal in S706 (N in S706), the result of the set value change is normal in S710 If the result is not normal (N in S710), or if the result of switching to the normal mode in S713 is not normal (N in S713), the master station 3 considers the importance or urgency of the result. Then, if necessary, a disconnection request of the distributed power source 6 is transmitted to the slave station 9, the disconnection result is received from the slave station 9, and stored as a processing result 35A5 (S714). It is assumed that the data of the release request and the release result include at least the distributed power source number, the packet type indicating the “release request”, and the release result. In addition, when the set value is not the agreed value (N in S707), it has been described that the set value is changed once. However, the change request may be made without trying the change, or the set value is set a predetermined number of times. If a change is instructed and the settling value still does not match the agreed value, a disconnection request may be made.

  Then, the master station 3 refers to the customer information 35A and notifies the processing result 35A5 to the customer contact 35A2 corresponding to the distributed power supply number 35A1 set in the data transmitted to the slave station 9 (S715). In the processing result 35A5, a switching result, a processing result, and a disconnection result until becoming NG are accumulated. According to this, since the customer can know the stage at which the process is not normal by acquiring and referring to the processing result relating to the set value, it is possible to examine future countermeasures. When receiving an inquiry from a customer, the processing result 35A5 corresponding to the distributed power supply number 35A1 or the customer contact address 35A2 may be notified.

  The master station 3 changes the setting by the slave station 9 when the set value of the subordinate protection relay 54 needs to be changed due to the change of the power system or the like, and the storage unit 35 Of the customer information 35A, a new set value is set as the set value 35A4, and the new set value is notified to the customer contact 35A2 corresponding to the distributed power source 35A1 connected to the interconnection protection relay 54.

  FIG. 8 shows data reception processing of the slave station 9. In this processing, in the slave station 9, the processing unit 93 mainly receives the data from the master station 3 via the IP network 7 and the relay station 4 by the communication unit 91, and sets the reference data while referring to and updating the data in the storage unit 94. The processing related to the switching of the value change switch and the set value is performed.

  First, the slave station 9 determines whether data has been received from the master station 3 (S801). Specifically, it is determined whether or not the communication unit 91 has received data. If the data has been received, the processing unit 93 further determines that the distributed power source number 94A1 in which the distributed power source number in the data is the slave station information 94A. It is determined whether or not it matches. If data having the same distributed power supply number has not been received (N in S801), the reception check is repeated.

  If the data having the same distributed power supply number is received (Y in S801), the slave station 9 refers to the packet type and control code in the data, and the data type is set to the set value change mode. , Switching to normal mode, and a request for disconnecting the distributed power source 6 are determined (S802).

  When the data type is an instruction to switch to the set value change mode (change change in S802), the slave station 9 determines whether or not the relay connection mode 94A2 of the storage unit 94 is in the set value change mode (S803). ). If it is not the set value change mode (N in S803), in order to switch to the set value change mode, the signal input / output unit 92 outputs a change switch switching signal to the magnet switch MGS2 (S804). If the changeover switches SW1 and SW2 are normally switched based on the contact information (Y in S805), the set value change mode is set in the relay connection mode 94A2 of the storage unit 94 (S806). . According to this, even if the interconnection protection relay 54 is operated by the set value processing instruction via the terminal T2 from the slave station 9, the trip signal reaches the slave station 9 via the terminal T4, and the switch 52 Since it does not go to the magnet switch MGS1 for operation, the distributed power source 6 does not have to be disconnected.

  If the relay connection mode 94A2 is the set value change mode in S803 (Y in S803), there is no need to switch the change switch, and the slave station 9 skips the processes in S804 to S806. If the changeover switch is not normally switched in S805 (N in S805), the process in S806 is skipped.

  Then, the slave station 9 transmits the change result of the change switch to the master station 3, and stores it in the storage unit 94 as the processing result 94A3 (S807). At that time, the control response result is set according to the switching result in the received change switch switching data shown in FIG. Specifically, “FFh” is set when the set value change mode has been set or when the switching has been normal. On the other hand, if the switching is not normal, “0Fh” is set. Then, the communication unit 91 transmits change switch switching data to the master station 3. Thereafter, the process returns to S801 to wait for reception of new data.

  When the data type indicates settling value processing (processing instruction in S802), the slave station 9 determines whether or not the relay connection mode 94A2 of the storage unit 94 is in the set value change mode (S808). If it is the set value change mode (Y in S808), since the set value processing can be performed, a processing signal is output to the terminal T2 based on the received set value processing data shown in FIG. 6B. (S809). Thereby, the setting value of the interconnection protection relay 54 can be acquired or changed. In particular, when writing a set value to the interconnection protection relay 54, it is necessary to disconnect the interconnection protection relay 54 from the switch 52, so it is confirmed that the set value change mode is in effect. This is because, for example, if the set value is written incorrectly, the interconnection protection relay 54 may operate instantaneously. If it is not the set value change mode (N in S808), the set value processing cannot be performed, so the process of S809 is skipped.

  Then, the slave station 9 transmits the set value processing result to the master station 3 and stores it as the processing result 94A3 in the storage unit 94 (S810). At that time, the processing response is set according to the processing result in the received set value processing data shown in FIG. Specifically, if a “normal” processing result is received from the interconnection protection relay 54 via the terminal T4 within a predetermined time (for example, 1 second) with respect to the processing signal, a result value of “01h” or more is set. Set. On the other hand, “00h” is set when the trip signal is not received within a predetermined time (for example, 1 second) with respect to the processing signal or when the processing signal is not output because it is not the set value change mode. To do. Then, the communication unit 91 transmits set value processing data to the master station 3. In addition, when acquisition of a set value is normal, the acquired set value is memorize | stored in the memory | storage part 94 as set value 94A4. Thereafter, the process returns to S801 to wait for reception of new data.

  When the data type indicates switching to the normal mode (normal switching in S802), the slave station 9 determines whether or not the relay connection mode 94A2 of the storage unit 94 is in the normal mode (S811). If it is not the normal mode (N in S811), in order to switch to the normal mode, the signal input / output unit 92 outputs a change switch switching signal to the magnet switch MGS2 (S812). If the changeover switches SW1 and SW2 are normally switched based on the contact information (Y in S813), the normal mode is set to the relay connection mode 94A2 of the storage unit 94 (S814).

  If the relay connection mode 94A2 is the normal mode in S811 (Y in S811), the slave station 9 skips the processes in S812 to S814 because there is no need to switch the change switch. If the changeover switch is not normally switched in S813 (N in S813), the process in S814 is skipped.

  Then, the slave station 9 transmits the change result of the change switch to the master station 3 and stores it as the processing result 94A3 in the storage unit 94 (S815). At that time, the control response result is set according to the switching result in the received change switch switching data shown in FIG. More specifically, “FFh” is set when the normal mode has been set or when the switching is normal. On the other hand, if the switching is not normal, “0Fh” is set. Then, the communication unit 91 transmits change switch switching data to the master station 3. Thereafter, the process returns to S801 to wait for reception of new data.

  When the data type is a request for disconnection of the distributed power source 6 (disconnection request in S802), the slave station 9 outputs a transfer cutoff signal to the magnet switch MGS1 by the signal input / output unit 92 (S816). ). Then, the data of the disconnection result corresponding to the open / close state of the switch 52 based on the contact information is transmitted to the master station 3 and stored in the storage unit 94 as the processing result 94A3 (S817). That is, if the switch 52 is open, the disconnection result is “normal”, and if the switch 52 is closed, the disconnection result is “abnormal”. Thereafter, in order to switch to the normal mode, the processes of S811 to S815 are performed, and the process returns to S801 to wait for reception of new data.

  Although the processing of the master station 3 has been described with reference to FIG. 7 and the processing of the slave station 9 has been described with reference to FIG. 8, the data transmission between the master station 3 and the slave station 9 included in these processing is A relay station 4 is interposed. That is, the relay station 4 receives data instructing processing from the master station 3 and transmits it to the slave station 9, while receiving data indicating the processing result from the slave station 9 and transmits it to the master station 3.

  In the power conditioner 5, even in the set value change mode, the system voltage and the like are monitored, and the interconnection protection relay 54 and the switch 52 operate when a power system failure occurs. More specifically, referring to FIG. 3, first, when the inverter control circuit 53 detects an abnormality in the power system, the system abnormality information is transmitted to the interconnection protection relay 54. The interconnection protection relay 54 receives system abnormality information from the inverter control circuit 53 and outputs a trip signal indicating the system abnormality. When the slave station 9 receives the trip signal from the terminal T4 even though the relay connection is in the set value change mode, the slave station 9 recognizes that the power system has failed and outputs a transfer cut-off signal to the magnet switch MGS1. .

  Separately, the master station 3 also detects a system abnormality and transmits a disconnection request of the distributed power source 6 to the slave station 9, so that the slave station 9 outputs a transfer cut-off signal to the magnet switch MGS1. According to the above, even if the grid protection relay 54 is changing the set value, the switch 52 is opened when a system abnormality occurs, so the transfer interruption function is effective and the distributed power source 6 is operated independently. Can be prevented.

  In the above embodiment, the program executed by the processing unit (CPU) is recorded on a computer-readable recording medium in order to make each device in the distributed power transfer cutoff system 1 shown in FIG. 1 function. Then, it is assumed that the distributed power supply transfer cutoff system 1 according to the embodiment of the present invention is realized by causing the computer to read and execute the recorded program. In this case, the program may be provided to the computer via a network such as the Internet, or a semiconductor chip or the like in which the program is written may be incorporated in the computer.

  According to the embodiment of the present invention described above, setting and management of the set value of the interconnection protection relay 54 can be performed smoothly. According to this, when the interconnection protection relay 54 is operated, the burden on the customer and the system administrator who are the installers of the distributed power supply 6 and the time and cost required for both are reduced, and the safety of the power system is ensured. , Can ensure public interest.

  Specifically, as shown in the determination of S707 in FIG. 7 and the processing of S708, when the set value (set value) set in the interconnection protection relay 54 does not match the agreement value, the interconnection protection relay 54 Since an instruction to change the set value to the agreed value is transmitted, the system administrator checks the set value and resets it if necessary even if the customer may change the set value. On the other hand, when the setting value of each interconnection protection relay 54 becomes necessary due to an increase in the number of photovoltaic power generation systems, the setting change is not made at each customer's house, but the setting change is made from the remote master station 3. By making it possible, there is no need for a worker to go to the site, so the labor of setting work can be saved. According to the above, in response to a request for an unexpected change in the set value of the interconnection protection relay 54 or a change request due to the convenience of the system administrator, the setting value setting for the interconnection protection relay 54 is promptly changed. be able to.

  Further, as shown in the determination in S707 or S710 and the processing in S711, after confirming that the correct settling value is set in the interconnection protection relay 54, the connection of the interconnection protection relay 54 is set to the normal mode. Can be returned.

<< Other embodiments >>
As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention. For example, the following embodiments can be considered.

(1) In the above embodiment, the slave station 9 responds to an instruction from the master station 3 with a series of set value processing (switching to the set value change mode, connected to the set value change mode) for the link protection relay 54 shown in FIG. In the above description, the processing signal is output to the protection relay 54, the mode is switched to the normal mode, and the like. However, the set value processing may be performed by another trigger. As an example, the slave station 9 includes an input unit such as a keyboard and a touch panel. Then, it is conceivable that a processing schedule is acquired in advance from the input unit by a customer operation, stored in the storage unit 94, and settling value processing is performed according to the processing schedule. According to this, since the slave station 9 automatically performs the set value processing in accordance with the once set processing schedule, it is possible to reduce the burden on the customer, the system administrator, and the local worker without relying on manpower. In addition, the diagnosis schedule can be adjusted according to the intention of each person, the situation of the interconnection protection relay 54, and the like.

  Further, when the local worker goes around the customer's home where the power conditioner 5 and the distributed power source 6 are installed, the processing instruction of the interconnection protection relay 54 is input by operating the input unit, and the slave station 9 It is conceivable to perform settling value processing in accordance with the instruction. According to this, the local worker can perform the set value processing of the interconnection protection relay 54 at an arbitrary timing. And it is also conceivable that the slave station 9 stores the agreed value and issues an alarm when the input set value is not as agreed value. According to this, for example, when a local worker inputs a set value, there is a setting error such as an error when specifying the corresponding number instead of the set value itself, or the setting button is not pressed after entering a numerical value. Since it is possible, there is a meaning and an effect that such a mistake is immediately notified to the local worker.

(2) In the above embodiment, the slave station 9 switches the relay connection mode according to the instruction from the master station 3, but the slave station 9 receives the instruction for the settling value processing from the master station 3, and the slave station 9 A series of processing such as “switching to mode, settling value processing, switching to normal mode” may be performed.

(3) In the above embodiment, it has been described that the connection of the grid protection relay 54 from the slave station 9 is switched to the set value change mode, and then the set value is acquired or changed. The normal mode may be performed.

(4) The distributed power supply transfer cut-off system 1 receives a message from the customer about the establishment of the distributed power supply 6 (by mail, etc.) There is a function of “sucking ID to relay station 4”. At that time, it is conceivable that the initial value of the set value at the time of newly installing the distributed power supply 6 is surely acquired by sucking up the set value of the interconnection protection relay 54 connected to the distributed power supply 6 together. Then, the acquired initial value is stored, and thereafter, it is monitored whether or not the set value of the interconnection protection relay 54 has changed from the initial value. If it has changed, the initial value is retransmitted to the interconnection protection relay 54. It is possible to set.

  The construction company notifies the power company sales office of the product ID of the distributed power source 6, the address of the installation location, and the set value of the interconnection protection relay 54 instead of the contact from the customer. By inputting and setting the notification contents in the master station 3, it is possible to immediately check the set values in the master station 3. According to this, the set value of the interconnection protection relay 54 can be confirmed at any timing after the installation, although not simultaneously with the installation of the distributed power supply 6.

1 Transfer interruption system for distributed power supply 3 Master station (device of power system manager)
5 Power conditioner 52 Switch 54 Link protection relay (protective relay)
6 Distributed power supply 9 Slave station (settling value processor)
SW1, SW2 change switch (switching means)

Claims (6)

A distributed power supply transfer cut-off system comprising: a master station that transmits a transfer cut-off signal of a distributed power supply; and a slave station that receives the transfer cut-off signal from the master station and cuts off the distributed power supply from a power system. And
The slave station is
Means for obtaining a set value that is a set value set in a protective relay that shuts off the distributed power source from the power system when an abnormality of the power system or the distributed power source is detected;
Means for changing the set value;
With
The master station is
Means for storing a proper value which is a set value to be set in the protective relay;
Means for obtaining the set value from the slave station;
Means for transmitting, to the slave station, an instruction to change the setting value of the protective relay to the appropriate value when the stored appropriate value is different from the acquired setting value;
After transmitting an instruction to change the set value to the appropriate value to the slave station, the means for transmitting the transfer cut-off signal to the slave station when the stored proper value is different from the set value acquired again When,
A transfer interruption system for a distributed power source, comprising: A distributed power supply transfer cut-off system comprising: a master station that transmits a transfer cut-off signal of a distributed power supply; and a slave station that receives the transfer cut-off signal from the master station and cuts off the distributed power supply from a power system. And
The slave station is
Means for changing a set value that is a set value set in a protective relay that cuts off the distributed power source from the power system when an abnormality of the power system or the distributed power source is detected;
The master station is
Means for acquiring an appropriate value, which is a set value to be set for each protection relay under control, and storing it for each protection relay ;
An instruction to change the settings for each protective relay to the appropriate value and means for transmitting collectively the slave station,
Means for transmitting the appropriate value to each customer's device;
A transfer interruption system for a distributed power source, comprising: When it is determined that the power system or the distributed power source is abnormal, processing related to the set value of the protective relay that outputs a cut-off signal that instructs the switch connected between the power system and the distributed power source to open. A settling value processing device to perform,
From the device of the power system manager, the first connection state in which the protective relay and the power system measuring instrument and the switch are connected, or the protective relay and the settling value processing device are connected. Switching data receiving means for receiving switching data indicating the second connected state,
Wherein based on the switching data switching data received by the receiving means, before Symbol first connection state, or, a switching means for switching the pre-Symbol second connection state,
Processing data receiving means for receiving the setting value output processing from the device of the power system manager, or receiving processing data indicating the setting value changing processing and the setting value to be changed, and
Based on the processing data received by the processing data receiving means in the state switched to the second connection state by the switching means, a signal for instructing output of the set value, or a change to the set value to be changed A settling value processing means for outputting a signal instructing to the protection relay, then obtaining the instructed output or change result from the protection relay, and transmitting it to a device of an administrator of the power system;
A return means for switching to the first connection state by the switching means after finishing the processing by the settling value processing means;
A settling value processing apparatus comprising: The set value processing device according to claim 3,
The set value processing apparatus characterized by storing a schedule of processing of the protective relay and performing processing of the protective relay according to the schedule. The set value processing device according to claim 3,
The set value processing apparatus characterized by storing a schedule of processing of the protective relay and performing processing of the protective relay according to the schedule. The set value processing device according to claim 3,
A settling value processing apparatus, wherein when the operation instruction of the protective relay is acquired by an operation of a local worker, the protective relay is processed.

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