TWI697174B - Regulating method of integrated system of renewable energy and distribution automation - Google Patents

Abstract

A control method for an integrated system of renewable energy and distribution automation is implemented by an integrated system of renewable energy and distribution automation. The integrated system of renewable energy and distribution automation performs power supply and monitoring for a feeder network, and includes a distribution automation system, a A renewable energy management system, a regional network equipment, and a renewable energy power generation system electrically connected to the feeder network. The integrated control method for renewable energy and power distribution automation includes: the distribution automation system generates a faulty feeder switch switching information, the power distribution The automation system informs the renewable energy management system of the faulty feeder switch switching information. The renewable energy management system generates a regulation information to the renewable energy power generation system. The renewable energy power generation system generates a plurality of output voltages according to the regulation information.

Description

Regulating method of integrated system of renewable energy and distribution automation

The invention relates to a method for regulating and controlling a distribution automation system, in particular to a method for regulating and controlling a renewable energy and distribution automation integrated system.

At present, Taipower has built a renewable energy management system (REMS), which is a combination of a distribution automation system (DAS) and a renewable energy and distribution automation system, for renewable energy power generation management. However, when the power failure of the renewable energy and distribution automation system occurs due to an accident, the renewable energy and distribution automation system will actively carry out the fault, detection, isolation and restoration (FDIR) of the accident feeder Procedures to achieve rapid isolation of the accident area and speed up the user's recovery of electricity. However, after the failure, detection, isolation and recovery procedures of the accident feeder of the renewable energy and distribution automation system, the impedance of the distribution network due to the change in feeder length will There are changes. At this time, if the renewable energy management system is connected to the power supply without proper control, there will be a serious problem of voltage fluctuations.

Therefore, the object of the present invention is to provide a control method for an integrated system of renewable energy and distribution automation to solve the problem of severe voltage fluctuations caused by the direct connection of the renewable energy to the grid after the feeder fails.

Therefore, the method for regulating and controlling the integrated system of renewable energy and distribution automation of the present invention is to supply and monitor multiple feeders. Each feeder includes multiple switches. The integrated system of renewable energy and distribution automation includes a distribution automation system and a renewable energy source. A management system, a local network device, and a renewable energy power generation system including multiple renewable energy site equipment that are electrically connected to the multiple feeders, each renewable energy site equipment generates an output voltage to the multiple feeder sites Corresponding to one of them, the distribution automation system controls the switching state of each switch, and the integrated control method of renewable energy and distribution automation includes the following steps: (A) when the distribution automation system detects one of the plurality of feeders occurs In case of power failure, a faulty feeder switch switching information is generated. The faulty feeder switch switching information indicates that each switch of the feeder is to be switched on or off; (B) The distribution automation system uses the faulty feeder switch switching information by The regional network equipment is transmitted to the renewable energy management system; (C) the renewable energy management system calculates a load change information caused by the change in the length of the feeder and the change in load according to the faulty feeder switch switching information, and according to The load change information generates a pair of control information with multiple control parameter groups corresponding to the feeder; (D) the renewable energy management system transmits the control information to the renewable energy power generation system, and the renewable energy power generation system regulates electricity according to the control information Each renewable energy site equipment connected to the feeder generates the output voltage.

The effect of the present invention is that the distribution automation system transmits the faulty feeder switch switching information to the renewable energy management system through the control method of the integrated system of renewable energy and distribution automation, so that the renewable energy management system can change the load according to the load change information Perform grid-connected impact analysis to generate the control information to control the renewable energy power generation system and effectively reduce the voltage fluctuation rate generated by the renewable energy reconnected to the grid.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same number.

The control method of the renewable energy and distribution automation integrated system of the present invention mainly identifies the fault interval and determines the normally open switch (Normal open, NO) when the distribution automation system (DAS) detects a power failure in the feeder ) And Normally Closed (Normal close, NC) points, transmit information to the Renewable Energy Management System (REMS), and perform system analysis based on the change in feeder length and determine the power of each renewable energy case Factor and actual power output operating parameters, after issuing commands to the smart converters of each case through the fourth-generation mobile communication (4G-LTE) network, and then notifying the distribution automation system that the power restoration process can be performed to reduce the renewable energy The impact of the power distribution system. More detailed system equipment for implementing the control method of the renewable energy and distribution automation integrated system of the present invention will be further described in the following content.

Referring to FIGS. 1 and 2, a renewable energy and distribution automation integrated system is electrically connected to a feeder network 6 to execute the control method of the renewable energy and distribution automation integrated system of the present invention, and supplies power to the six feeders of the feeder network 6 In this embodiment, the feeder network 6 uses a normally open loop distribution feeder and is equipped with a distributed power supply. One end of each feeder is electrically connected to a secondary substation (S/S) 61. The other end is electrically connected to a normally open switch 64, and the feeder is sequentially connected from the secondary substation 61 to the normally open switch 64 to a feeder circuit brake (FCB) 62 and a plurality of normally closed switches 63 Among them, each switch is a four-way switch equipped with a feeder terminal unit (FTU) (not shown), but not limited to this.

The renewable energy and distribution automation integrated system includes a distribution automation system 2, a renewable energy management system 3, a regional network device 4 disposed between the distribution automation system 2 and the renewable energy management system 3, and a renewable energy management system The renewable energy power generation system 5 of the energy management system 3 communication connection. The local area network device 4 may be a device that implements a wired local area network (Local area network, LAN) or a device that implements a wireless local area network (Wireless local area network, WLAN). In this embodiment, The local area network device 4 is a device that realizes a wired local area network. In addition, the communication connection may be an Internet connection, or through fiber optic technology, Asymmetric Digital Subscriber Line (ADSL) technology, or wireless local area network access to the Internet The combined connection of the networks may also be a wireless mobile communication system (Wireless mobile communication system), but not limited to this. In this embodiment, the renewable energy management system 3 and the renewable energy generation The communication connection between the systems 5 is a fourth-generation wireless mobile communication system (4G-LTE).

The power distribution automation system 2 includes a power distribution management device 21, and a plurality of feeder remote terminal units (FRTU) in communication with the power distribution automation system 2, and the power distribution management device 21 has an application server 211 and a data server group 212 in communication connection with the application server 211. The data server group 212 may be a data server, or may be composed of multiple data servers, but not limited to this. In this embodiment, the data server group 212 has multiple data servers . The communication connection between the distribution automation system 2 and the plurality of feed information terminal devices, and the communication connection between the application server 211 and the data server group 212 are all regional networks.

The renewable energy management system 3 includes a renewable energy management server 31 and a wireless communication device 32 electrically connected to the renewable energy management server 31. The wireless communication device 32 supports the fourth-generation wireless mobile communication system to virtualize mobile data Dedicated network (Mobile data virtual private network, MDVPN) to send and receive wireless transmission information.

The local area network device 4 is installed with a data sampling and monitoring system (supervisory control and data acquisition, SCADA) to realize the communication connection between the distribution automation system 2 and the renewable energy management system 3, so that the distribution automation system 2 and The renewable energy management system 3 can carry out bidirectional data transmission.

The renewable energy power generation system 5 includes a plurality of renewable energy crime scene equipment 51, and each renewable energy crime scene equipment 51 has an information transceiving unit 511 that supports the fourth-generation wireless mobile communication system to use a virtual private network for mobile data To send and receive wireless transmission information for each renewable energy site equipment 51 to transmit data to the wireless communication device 32 and receive data from the wireless communication device 32. In this embodiment, each information transceiver unit 511 is a Gateway (Gateway).

Each feeder information terminal device 22 in the distribution automation system 2 is electrically connected to multiple feeder end units of the feeder network 6 to receive multiple feeder end information from the multiple feeder end units, each The feeder end report information includes a fault flag, multiple feeder end report information received by each feeder information terminal device, and each feeder end report information records the relationship between the feeder end unit to which it belongs and other feeder end units Connection relationship. The renewable energy power generation system 5 is electrically connected to the six feeders to output a plurality of renewable energy output voltages to the six feeders, wherein each renewable energy injection current of each feeder is a regeneration from the renewable energy power generation system 5 Energy crime scene equipment 51.

When a power failure occurs on a feeder, the integrated system of renewable energy and distribution automation will start the following control procedures: (1) The distribution automation system 2 detects an accidental power outage on the feeder and initiates the failure of the feeder in the accident, The generation of detection, isolation and power recovery schemes also determines the position of the normally open switch and normally closed switch of the feeder. (2) The distribution automation system 2 notifies the renewable energy management system 3, and informs which feeder has a failure and the position of the normally open switch and normally closed switch. (3) The renewable energy management system 3 re-plans a new structure of the feeder based on the notified switch position. (4) The renewable energy management system 3 starts to analyze the impact of renewable energy on-grid to determine the control parameters of each of the feeder's renewable energy cases. (5) The renewable energy management system 3 uses the wireless communication device 32 of the renewable energy management server 31 to issue control parameters to various renewable energy crime scenes for control. (6) The renewable energy management system 3, after confirming the completion of the regulation in each case, informs the distribution automation system 2 that it can carry out the feeder fault, detection, isolation, and power recovery schemes. (7) The distribution automation system 2 performs accident isolation on the feeder according to the fault, detection, isolation and power restoration scheme of the feeder. The detailed flow steps of the control method (control program) of the integrated system of renewable energy and distribution automation described above will be further described in the following content.

Referring to FIGS. 3 and 4, the integrated renewable energy and power distribution automation system executes the control method of the integrated renewable energy and power distribution automation system. The control method includes steps 1A1 to 16F. After the start, first step A1.

In step A1, in the case of normally open loop distribution feeders and the installation of distributed power supplies, when one of the feeders of the feeder network 6 fails due to a fault, multiple feeders will be generated from the feeder outlet to the fault point Fault current, each terminal unit of the feeder through which the multiple fault currents flow will generate a fault flag, while the remaining terminal units of the feeder through which the multiple fault currents will not generate a fault flag Mark, then go to step two A2.

In step two A2, each feeder end unit of the feeder network 6 transmits a feeder end report information to the feeder information terminal device 22 to which it belongs, and each feeder information terminal device 22 returns the number of The feeder end reports information to the power distribution management device 21, and then proceeds to step three A3.

In step 3 A3, the application server 211 determines the failure of the feeder based on all feeder end report information and the connection relationship of all feeder end units on the feeder network 6 recorded by the data server group 212 Point and generate a fault corresponding to the fault, detection, isolation and power recovery action plan information, the fault corresponding plan information includes a fault feeder switch switching information to indicate which switches on the feeder will be switched to non-conducting for fault Isolation, those switches have to be switched on to reduce the power outage range, and then step 4A4 is entered.

In step 4A4, the data server group 212 receives the fault correspondence solution information from the application server 211, and records and updates the fault feeder switch switching information and the connection of all terminal units according to the fault correspondence scheme information Information, then go to step 5B.

In short, step 1 A1 to step 4 A4 is that when the distribution automation system 2 detects that one of the six feeders has a power failure, the corresponding information of the fault and the switching information of the faulty feeder switch are generated. The faulty feeder switch switching information includes an indication that each switch of the feeder is to be switched on or off.

In step 5B, the distribution automation system 2 transmits the faulty feeder switch switching information through the LAN device 4 with the data sampling and monitoring system, and the fault is recorded by the data server 212 before a fault The normal feeder current information of the feeder reaches the renewable energy management system 3, and then step 6 C1 is entered.

In step C1, the renewable energy management server 31 first calculates a feeder length change information and a feeder possible load based on the faulty feeder switch switching information and the normal feeder current information, and then the renewable energy management server 31 then According to the feeder length change information and the possible load of the feeder, a load change information of the feeder is calculated, and then step 7C2 is entered.

In step 7C2, the renewable energy management server 31 is based on the load change information, and one of the renewable energy site equipment 51 in the renewable energy power generation system 5 that is electrically connected to the feeder is a renewable energy site equipment 51 The power generation capacity is analyzed by power flow to calculate the required regulation information and the system voltage change rate caused by the regulation information when the renewable energy power generation system 5 is to be incorporated into the feeder. The regulation information includes A plurality of regulation parameter groups for regulating the plurality of renewable energy case equipments respectively, the plurality of renewable energy case equipments are electrically connected to the feeder, each regulation parameter group includes a power factor and a real power parameter, and then enters the step Eight C3.

In step eight C3, the renewable energy management server 31 determines whether the system voltage variation rate exceeds a variation specification value. In this embodiment, the preset limit range is a unit voltage variation rate specification value (3%), If yes, go to step nine C4, if no, go to step twelve C7.

In step nine C4, the renewable energy management server 31 judges that the power factor reaches a rated upper limit value of power factor. In this embodiment, the upper limit value of the rated power factor is 0.9. If yes, step 10 is entered. One C6, if not, go to step 10 C5.

In step ten C5, the renewable energy management server 31 adjusts the power factor, and performs power flow analysis again according to the adjusted multiple control parameter sets, and then returns to step eight C3.

In step 11C6, the renewable energy management server 31 reduces the real power parameter corresponding to the power factor, and performs power flow analysis again according to the adjusted multiple control parameter groups, and then returns to step 8C3.

In step 12C7, the renewable energy management server 31 determines that the voltage change rates of the plurality of renewable energy site equipment 51 electrically connected to the feeder are all within the change specification value, and then proceeds to step 13C8.

In step 13C8, the renewable energy management system 3 obtains the plurality of control parameter groups corresponding to the feeder system voltage change rate within the change specification value, and then proceeds to step 14D.

In short, step 6 C1 to step 13 C8 is that the renewable energy management system 3 calculates the load change information due to the change in the length of the feeder and the change in the load amount according to the switching information of the faulty feeder switch, and according to The load change information generates the regulation information.

In step 14D, the renewable energy management system 3 uses the wireless communication device 32 to transmit the multiple control parameter sets to the corresponding multiple renewable energy scene equipment 51 through the mobile data virtual private network, respectively, to Regulate the plurality of renewable energy crime scene equipment, wherein the information transceiving unit 511 of each renewable energy crime scene equipment 51 performs information reception and transmission, and then proceeds to step 15E.

In step 15E, the renewable energy management system 3 transmits a control completion signal to the distribution automation system 2 through the local network device 4 to inform the distribution automation system 2 that the fault response plan information can be executed to perform the fault , Detection, isolation and power recovery actions, and then step 16F.

In step 16F, the distribution automation system 2 completes the switching operation of the multiple switches that need to be adjusted for the feeder to achieve fault isolation and power recovery preparation, multiple renewable energy cases of the renewable energy power generation system 5 The field device 51 outputs a plurality of power supply voltages to be connected to the secondary substation 61 that is electrically connected to the feeder and connected to the grid.

In summary, the advantages of the control method of the integrated system of renewable energy and distribution automation of the present invention are: the control method of the integrated system of renewable energy and distribution automation is executed by the integrated system of renewable energy and distribution automation to make the distribution automation system 2 After generating the corresponding information of the fault corresponding to the feeder's fault, detection, isolation and power recovery, the renewable energy management system 3 conducts a renewable energy grid-connected voltage surge analysis based on the fault corresponding plan information to control the renewable energy power generation system 5 The multiple output power supply voltages reduce the impact of the renewable energy power generation system 5 on the voltage fluctuation of the feed network 6, and effectively improve the power supply quality of the renewable energy power generation system 5 to the feed network 6.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

2: Distribution automation system 21: Distribution management equipment 211: Application server 212: Data server group 22: Feeding information terminal equipment 3: Renewable energy management system 31: Renewable energy management server 32: Wireless communication equipment 4: LAN equipment 5: Renewable energy power generation system 51: Renewable energy crime scene equipment 6: feeder network 511: Information transceiver unit 61: Secondary Substation 62: feeder circuit breaker 63: normally closed switch 64: normally open switch A1~A4: Flow chart steps 1 to 4 B: Step 5 of the flowchart C1~C8: Flow chart steps 6 to 13 D~F: flowchart step 14 ~ step 16

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings. Among them: FIG. 1 and FIG. 2 are a preferred embodiment of the control method of the integrated renewable energy and distribution automation system of the present invention. Block diagrams; and FIGS. 3 and 4 are flowcharts illustrating the preferred embodiment of the control method of the integrated system of renewable energy and distribution automation.

2: Distribution automation system

21: Distribution management equipment

211: Application server

212: Data server group

22: Feeding information terminal equipment

3: Renewable energy management system

31: Renewable energy management server

32: Wireless communication equipment

4: LAN equipment

5: Renewable energy power generation system

51: Renewable energy crime scene equipment

511: Information transceiver unit

6: feeder network

Claims (9)

A control method for an integrated system of renewable energy and distribution automation is executed by an integrated system of renewable energy and distribution automation to supply and monitor multiple feeders. Each feeder includes multiple switches. The integrated system of renewable energy and distribution automation It includes a power distribution automation system, a renewable energy management system, a regional network equipment, and a renewable energy power generation system that includes multiple renewable energy site equipment that are electrically connected to the multiple feeders. Each renewable energy site equipment generates An output voltage reaches one of the multiple feeders. The distribution automation system controls the switching state of each switch. The integrated control method of renewable energy and distribution automation includes the following steps: (A) When the distribution automation system detects the When one of the feeders fails, a power failure occurs, and a faulty feeder switch switching information is generated. The faulty feeder switch switching information indicates that each switch of the feeder is to be switched on or off; (B) the distribution automation system The faulty feeder switch switching information is transmitted to the renewable energy management system through the local network equipment; (C) The renewable energy management system calculates the change due to the length of the feeder and the change in load according to the faulty feeder switch switching information A load change information, and according to the load change information, a pair of control information with multiple control parameter sets corresponding to the feeder is generated; and (D) the renewable energy management system transmits the control information to the renewable energy power generation system, the The renewable energy power generation system regulates and controls each renewable energy site equipment electrically connected to the feeder according to the regulation information, so that each renewable energy site equipment generates an output voltage. The control method for an integrated system of renewable energy and distribution automation as described in claim 1, wherein, in step (A), when the distribution automation system detects that one of the feeders has a power failure, it generates a Fault corresponding plan information indicating faults, detection, isolation and power recovery actions of the feeder, and the fault corresponding plan information includes switching information of the faulty feeder switch. The control method for an integrated system of renewable energy and distribution automation as described in claim 2, wherein in step (B), the distribution automation system also transmits normal feeder current information of the feeder recorded before a fault to the renewable energy Management system. The control method for a renewable energy and distribution automation integrated system as described in claim 3, wherein in step (C), the renewable energy management system is based on the load change information, the normal feeder current information, and the multiple renewable energy sources One of the power generation capacity of the crime scene equipment is used to calculate a set of control parameters for the corresponding renewable energy crime scene equipment. The control method for an integrated system of renewable energy and distribution automation as described in claim 4, wherein in step (C), each control parameter group includes a power factor and a real power parameter. The control method for an integrated system of renewable energy and distribution automation as described in claim 1, wherein, in step (D), the renewable energy management system transmits the multiple control parameter sets to the control system via a wireless communication device A plurality of renewable energy crime scene equipment, the plurality of renewable energy crime scene equipment are electrically connected to the feeder. The control method of the integrated system of renewable energy and distribution automation as described in claim 2, further comprising the following steps: 　　 (E) The renewable energy management system transmits a control completion signal to the distribution automation system through the local network equipment, so that After the distribution automation system executes the information of the failure corresponding plan on the feeder, the renewable energy power generation system restores power to the feeder. The control method for an integrated system of renewable energy and distribution automation as described in claim 1, wherein, in step (A), the distribution automation system includes a power distribution management device and a plurality of feeds in communication with the power distribution management device Information terminal equipment, the power distribution management equipment has an application server and a data server group; the application server and the data server group are communicatively connected for two-way information transmission. The control method of a renewable energy and distribution automation integrated system as described in claim 1, wherein, in step (C), the renewable energy management system includes a renewable energy management server and a wireless communication device; the renewable energy management servo The wireless communication device performs two-way information transmission with the renewable energy power generation system.

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