Multi-zone-area flexible interconnection local real-time control system based on zone area intelligent fusion terminal

Abstract

The invention discloses a multi-zone-area flexible interconnection local real-time control system based on zone area intelligent fusion terminals, which comprises zone area fusion terminals, flexible interconnection devices, a coordination controller, switches and extension modules, and is characterized in that each zone area is provided with a zone area fusion terminal device, and the extension modules are inserted into the zone area fusion terminals through standard interfaces; the transformer area fusion terminal is connected with the coordination controller through an optical fiber and a switch to form a local area network to realize information interconnection and intercommunication, the coordination controller obtains analog quantity sampling point data of each transformer area, then the coordination controller calculates and processes the sampling data of each transformer area to obtain an effective value of the analog quantity data, and the effective value is used for performing data processing on the effective value. And the coordination controller generates a regulation and control strategy of the flexible interconnection device on energy of each transformer area based on transformer area analog quantity sampling point data obtained from the transformer area fusion terminal, a state signal of the transformer area main switch intelligent switch and other data. According to the invention, all functional requirements of the flexible interconnection device for relatively high real-time requirements can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to an on-site real-time control system for flexible interconnection of multiple substations based on substation intelligent fusion terminals. Background Art

[0002] In modern power systems, substations are the basic units of distribution systems, and their operational stability and reliability have a direct impact on the quality of power supply to users. With the continuous growth of power demand and the widespread access to distributed energy, traditional substation operation and management methods face many challenges.

[0003] Most traditional substations operate independently, and there is a lack of effective coordination and energy interaction mechanisms between substations. In the application scenario of flexible interconnection of multiple substations, it is necessary to effectively regulate the energy of multiple substations. Due to the delay in data acquisition and transmission, traditional substation equipment cannot meet these functional requirements with high real-time requirements. In operations such as power outages and power transfers in multiple substations, it is necessary to be able to directly control the intelligent circuit breakers on the substation side and to be able to retrieve the open / closed position signals of the circuit breakers to ensure the accuracy and reliability of the operation. The existing substation intelligent fusion terminals lack such remote control export functions and remote signal input functions, and cannot meet the control needs of flexible interconnection of multiple substations in these aspects.

[0004] Flexible control system is a control system for dynamic, complex and uncertain tasks, which can perform adaptive and flexible control according to environmental changes and task requirements. However, the existing solutions still have shortcomings:

[0005] (I) Plan 1

[0006] like Figure 1 As shown in the figure, the flexible interconnection control system is mainly composed of telecontroller, PT and CT transformers, flexible interconnection device, coordination controller, intelligent switch of the main switch of the substation, etc. The telecontroller is responsible for real-time collection of the electrical quantity data of the substation and transmits the data to the coordination controller through optical fiber. Each substation will be installed with a telecontroller, so that the coordination controller can obtain the electrical quantity data of each substation through the telecontroller, thereby realizing the function of the flexible interconnection device to regulate the energy of each substation. The disadvantages of this solution are:

[0007] 1) Increased cost and construction difficulty: Each substation needs to add an additional telecontrol controller, and a separate PT and CT transformer needs to be added on the substation side.

[0008] 2) All operating data and control strategies of the flexible interconnected device are executed locally, lacking remote monitoring and operation and maintenance at the distribution master station.

[0009] (II) Option 2

[0010] like Figure 2 As shown in the figure, the flexible interconnection control system is mainly composed of the substation fusion terminal, PT and CT transformers, flexible interconnection devices, coordination controllers, switches, substation main switch intelligent switches, etc. The fusion terminal will collect the substation electrical quantity data in real time and transmit the electrical quantity data to the coordination controller through the network cable. Each substation will be equipped with a substation fusion terminal. Each substation fusion terminal is connected to the coordination controller through a network cable and a switch. In this way, a local area network can be formed between the substation fusion terminal and the coordination controller to realize information interconnection and intercommunication. In this way, the coordination controller can obtain the electrical quantity data of each substation, thereby realizing the function of the flexible interconnection device to regulate the energy of each substation. The disadvantages of this solution are:

[0011] 1) The existing substation fusion terminal does not have an I / O port, and it is impossible to control the opening / closing of the intelligent main switch of the control station through a hard node.

[0012] 2) The existing substation fusion terminal cannot send the sampled waveform collected by the real-time line to the coordination controller, and the coordination controller cannot process application functions such as harmonic compensation that have high requirements for sampling real-time performance. Summary of the invention

[0013] In view of the deficiencies in the prior art, the present invention discloses an on-site real-time control system for flexible interconnection of multiple substations based on an intelligent substation fusion terminal to solve the problems raised in the above-mentioned background technology.

[0014] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an on-site real-time control system for multiple substations with flexible interconnection based on intelligent fusion terminals of substations, including a substation fusion terminal, a flexible interconnection device, a coordination controller, a switch and an extension module. Each substation is provided with a substation fusion terminal device. The extension module is inserted into the substation fusion terminal through a standard interface. The substation fusion terminal is connected to the coordination controller through an optical fiber and a switch to form a local area network to realize information interconnection. The coordination controller obtains the analog sampling point data of each substation, and then the coordination controller calculates and processes the sampling data of each substation to obtain the effective value of the analog data. The coordination controller generates a flexible interconnection device based on the analog sampling point data of the substation obtained from the substation fusion terminal. The control strategy for the energy of each substation.

[0015] Preferably, the expansion module is used to sample the analog quantity of the substation line in real time and transmit the sampled waveform to the coordination controller in real time, so that the flexible interconnection device can realize the function of real-time compensation of substation harmonics.

[0016] Preferably, the expansion module includes a hard contact opening interface, and the substation fusion terminal controls the opening / closing function of the substation main intelligent switch through the hard contact opening interface. This function can cooperate with the flexible interconnection device to realize the substation power outage and power supply transfer function.

[0017] Preferably, the expansion module includes a fiber optic interface, and the station area fusion terminal directly communicates with the outside through the fiber optic interface.

[0018] Preferably, the system is provided with a cloud-pipe-edge-end hierarchical architecture of the electric power Internet of Things, realizing the remote monitoring function of the cloud master station on the flexible interconnection device.

[0019] Preferably, the expansion module communicates with the core board of the substation fusion terminal through a USB interface to achieve data sharing and receive external control instructions from the application software in the core board.

[0020] Preferably, the substation fusion terminal acquisition board is provided with a current transformer and a voltage transformer responsible for real-time acquisition of analog data of line current and voltage, and converting them into analog data within the measuring range processed by the metering chip. The metering chip will perform digital-to-analog conversion on the analog data and forward it to the substation fusion terminal main control board through the waveform DMA interface in real time, and then the substation fusion terminal main control board will transparently forward it to the extension module. The extension module will then receive the sampled waveform in real time through the microcontroller SPI interface, package it and send it to the third-party device, thereby realizing the forwarding function of the sampled waveform sampling data.

[0021] Preferably, the exchange metering chip adopts a metering chip with 1 SPI interface and 1 independent DMA interface. The real-time data of the metering chip is transmitted to the expansion module through DMA. The expansion module transmits the data to the flexible interconnection coordination control board through optical fiber signals, and the sampling delay is controlled within 10ms.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. While meeting the requirements of the substation fusion terminal specifications, the present invention provides a method for transmitting the sampling waveform from the substation fusion terminal acquisition board to the expansion module, and then the expansion module transmits the sampling waveform in real time to other devices that need to obtain real-time sampling data of the substation.

[0024] 2. While meeting the requirements of the substation fusion terminal specifications, the present invention provides an expansion module with a hard-open node, which enables the substation fusion terminal to have the control function of opening / closing the substation main switch. The expansion module has fiber optic communication, which enables the substation fusion terminal to have the function of external fiber optic communication.

[0025] 3. The present invention eliminates the remote controller of the traditional flexible interconnection device, and instead transmits the real-time data of voltage and current collected by the fusion terminal to the expansion module in real time through the DMA channel of the metering chip. The expansion module then transmits the data to the coordination controller through the optical fiber transceiver circuit. This solution can control the sampling delay within 10ms, and can meet all functional requirements of the flexible interconnection device with relatively high real-time requirements.

[0026] 4. On the basis of meeting the requirements of the State Grid technical specifications, the present invention designs the device exchange circuit and expands an extension module to connect with the substation intelligent fusion terminal through a pin header interface, thereby realizing the function of forwarding the real-time data of the line sampling point to a third-party device, in order to cope with the functional requirements of forwarding real-time sampling data in certain special application scenarios and under the condition that the substation intelligent fusion terminal itself is installed in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0028] In the attached picture:

[0029] Figure 1 It is a schematic diagram of the architecture of the flexible interconnected control system of the existing solution one;

[0030] Figure 2 It is a schematic diagram of the architecture of the flexible interconnection control system of the existing solution 2;

[0031] Figure 3 It is a schematic diagram of the architecture of the flexible interconnection control system designed by the present invention;

[0032] Figure 4 It is a functional module schematic diagram of the original area fusion terminal of the present invention;

[0033] Figure 5 It is a functional module diagram of the improved backend area fusion terminal of the present invention;

[0034] Figure 6 It is a schematic diagram of the principle of the expansion function of the terminal in the station area fusion of the present invention;

[0035] Figure 7 It is a schematic diagram of the installation structure of the expansion module in the present invention;

[0036] Numbers in the figure: 1. Substation fusion terminal; 2. Substation intelligent main switch; 3. Voltage transformer; 4. Current transformer; 5. Coordination controller; 6. Flexible interconnection device; 7. Optical fiber; 8. Extension module; 9. Substation fusion terminal main control board; 10. Substation fusion terminal exchange board; 11. Substation fusion terminal shell. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] Example: Figure 3-Figure 7 As shown, based on the flexible interconnection of multiple substations in situ real-time control system of substation intelligent fusion terminal, it includes substation fusion terminal 1, voltage transformer 3, current transformer 4, flexible interconnection device 6, coordination controller 5, switch, substation main switch intelligent switch 2, etc. The substation fusion terminal 1 includes substation fusion terminal main control board 9, substation fusion terminal exchange board 10 and substation fusion terminal shell 11. The substation fusion terminal exchange board 10 is inside the substation fusion terminal shell 11. The substation fusion terminal main control board 9 is located at the upper end of the substation fusion terminal exchange board 10; and an expansion module 8 is added, and the expansion module 8 is located on the upper end wall of the substation fusion terminal main control board 9; the expansion module 8 can be inserted into the fusion terminal device through a standard interface. Based on this expansion module 8, the fusion terminal can transmit the substation analog sampling point data to the coordination controller 5 in real time through the optical fiber 7. Each substation is equipped with a substation fusion terminal device, and each substation fusion terminal 1 is connected to the coordination controller 5 through an optical fiber 7 and a switch, thereby forming a local area network between the substation fusion terminal 1 and the coordination controller 5 to achieve information interconnection. The coordination controller 5 obtains the analog sampling point data of each substation, calculates and processes it to obtain the effective value of the analog data, and based on these effective value data and the data such as the state of the intelligent main switch of the substation collected and controlled by the expansion module 8, the flexible interconnection device 6 generates a control strategy for the energy of each substation.

[0039] Furthermore, the expansion module 8 has real-time sampling and harmonic compensation functions: the designed expansion module 8 can be inserted into the fusion terminal device through a standard interface, and can sample the analog quantity of the substation line in real time and transmit the sampled waveform to the coordination controller 5 in real time. Based on this function, the flexible interconnection system can add the function of real-time compensation for substation harmonics. In traditional systems, it is difficult to achieve real-time and effective compensation for harmonics because it is impossible to quickly obtain real-time analog quantity data of substation lines. The present invention solves this problem.

[0040] Furthermore, the expansion module 8 includes a hard contact opening interface function; the designed expansion module 8 has a hard contact opening interface, so that the fusion terminal can control the opening / closing function of the intelligent main switch 2 of the control area through the hard contact opening of the expansion module 8. This function is of great significance in the operation of power outage and power supply transfer of multiple areas with flexible interconnection, but in the previous intelligent fusion terminals of the area, there is a lack of such a function of directly controlling the intelligent main switch.

[0041] Furthermore, the expansion module 8 has an optical fiber 7 interface function, so that the fusion terminal can directly communicate with the outside through the optical fiber 7. In the application scenario of multiple stations, the distance between stations may be far, and the traditional communication method is prone to unstable communication quality. The optical fiber 7 interface of the present invention ensures the stability and reliability of data transmission.

[0042] Furthermore, it meets the power Internet of Things architecture and remote monitoring functions. The designed flexible interconnection control system solution meets the hierarchical architecture of the power Internet of Things "cloud-pipe-edge-end", and opens up the remote monitoring function of the cloud master station to the flexible interconnection device from the physical link. This helps to realize the intelligent management of the power system and improve the operating efficiency and reliability of the entire power system.

[0043] Furthermore, the design of the expansion module 8 includes:

[0044] like Figure 4 As shown, in the existing system architecture of the station area fusion terminal 1, the exchange metering unit obtains the PT / CT value integration and averages it and sends the data to the main control unit. The data calculated by the main control unit algorithm communicates with other devices through the external interface. However, the delay from obtaining PT / CT data to processing the data and interacting with other devices takes about 3 seconds, which cannot meet the functional applications of the flexible interconnection device 6 with high real-time requirements.

[0045] like Figure 5 As shown, in order to meet the application of high real-time requirements for flexible interconnection, the present invention improves the existing system architecture. First, the cross-collection metering chip adopts a metering chip with 1 SPI interface and 1 independent DMA interface, and transmits the real-time data of the metering chip directly to the reserved module expansion module 8 as the fusion terminal through DMA. Then, secondary development is carried out on the extension module 8, adding the CPU minimum system and the optical fiber 7 transceiver circuit, and the extension module 8 transmits the data received by DMA to the flexible interconnection coordination control board through the optical fiber 7 signal. This improved scheme can control the sampling delay within 10ms, and can meet all functional requirements of the flexible interconnection device 6 with relatively high real-time requirements, such as the harmonic compensation function of the substation area, etc., and realizes the interconnection and intercommunication of the fusion terminal, the coordination control device, the flexible interconnection equipment, etc.

[0046] like Figure 6As shown, the current transformer 4 and the voltage transformer 3 of the intelligent fusion terminal exchange board of the substation are responsible for real-time acquisition of analog data such as line current and voltage and converting them into analog data within the range that the metering chip can process. The metering chip will perform digital-to-analog conversion on the analog data and forward it to the main control board of the intelligent fusion terminal in the substation in real time through the waveform DMA interface, and then the main control board of the intelligent fusion terminal in the substation will transparently forward it to the expansion module 8. The expansion module 8 then receives the sampled waveform in real time through the single-chip SPI interface and packages it and sends it to the third-party device, thereby realizing the forwarding function of the real-time sampled waveform sampling data. At the same time, the designed expansion module 8 can also communicate with the core board of the intelligent fusion terminal in the substation through the USB interface to realize data sharing, and can receive functions such as external control instructions of the application software in the core board, and at the same time, this also adds the function that the intelligent fusion terminal in the substation originally did not have a control export.

[0047] Among them, the substation fusion terminal 1 is a standardized device with enterprise specifications issued by the State Grid. Based on the existing specifications and standards, we believe that the present invention is the only method that can realize the transmission of real-time sampled waveform data between the substation fusion terminal 1 and the flexible interconnection, and can solve all application functions of the flexible interconnection with relatively high real-time sampling data.

[0048] Specific working principle:

[0049] 1) Connection and data transmission between extension module 8 and fusion terminal

[0050] The extension module 8 is connected to the intelligent fusion terminal of the substation through a standard interface (such as a pin header interface). In terms of data transmission, the current transformer 4 and the voltage transformer 3 of the substation intelligent fusion terminal acquisition board collect analog data such as line current and voltage in real time and convert them into analog data within the range that the metering chip can process. The metering chip performs digital-to-analog conversion on the analog data and forwards it to the main control board of the substation intelligent fusion terminal through the waveform DMA interface in real time, and then the main control board of the substation intelligent fusion terminal transparently forwards it to the extension module 8. The extension module 8 then receives and packages the sampled waveform in real time through the SPI interface of the single-chip microcomputer, and finally sends it to the third-party device to realize the forwarding function of the real-time sampled waveform sampling data.

[0051] 2) Communication between expansion module 8 and the core board of the intelligent fusion terminal in the substation

[0052] The designed expansion module 8 communicates with the core board of the intelligent fusion terminal in the area through the USB interface to realize data sharing. The expansion module 8 can receive external control instructions of the application software in the core board and other functions, adding a control export function that the intelligent fusion terminal in the area does not originally have.

[0053] 3) Coordinate the workflow of controller 5

[0054] The coordination controller 5 obtains the analog sampling point data of each substation by connecting to each substation fusion terminal 1 (connected by a switch and an optical fiber 7). The data are calculated and processed, such as calculating the effective value of voltage and current. Based on these calculation results, the flexible interconnection device 6 generates a strategy for regulating the energy of each substation, such as a load transfer strategy, a harmonic compensation strategy, etc.

[0055] 4) Control and monitoring of the intelligent switch 2 of the main switch of the substation

[0056] When it is necessary to perform power outage and power transfer operations, the fusion terminal controls the opening / closing of the main intelligent switch 2 in the console area through the hard contact opening interface of the expansion module 8. At the same time, the opening / closing position signal of the intelligent circuit breaker is collected through the remote signal opening function of the expansion module 8 to ensure the accuracy and reliability of the operation.

[0057] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Based on the flexible interconnection of multiple zones in real-time control system of zone intelligent fusion terminal, the characteristics are: It includes a substation fusion terminal, a flexible interconnection device, a coordination controller, a switch and an extension module. Each substation is provided with a substation fusion terminal device. The extension module is inserted into the substation fusion terminal through a standard interface. The substation fusion terminal is connected to the coordination controller through an optical fiber and a switch to form a local area network to achieve information interconnection. The coordination controller obtains the analog sampling point data of each substation, and then obtains the effective value of the analog data by calculating and processing the sampling data of each substation. The coordination controller generates a flexible interconnection device based on the substation analog sampling point data obtained from the substation fusion terminal. The control strategy for the energy of each substation.

2. According to claim 1, the flexible interconnection and real-time control system for multiple stations based on the station intelligent fusion terminal is characterized by: The expansion module is used to sample the analog quantity of the substation line in real time and transmit the sampled waveform to the coordination controller in real time, so that the flexible interconnection device can realize the function of real-time compensation of substation harmonics.

3. According to claim 1, the flexible interconnection and real-time control system for multiple stations based on the station intelligent fusion terminal is characterized by: The expansion module includes a hard contact output interface, and the substation fusion terminal controls the opening / closing function of the substation main switch intelligent switch through the hard contact output interface.

4. According to claim 1, the flexible interconnection and real-time control system for multiple stations based on the station intelligent fusion terminal is characterized by: The expansion module includes an optical fiber interface, and the station area fusion terminal directly communicates with the outside through the optical fiber interface.

5. According to claim 1, the flexible interconnection and real-time control system for multiple stations based on station intelligent fusion terminal is characterized by: The system is provided with a cloud-pipe-edge-end hierarchical architecture of the electric power Internet of Things, realizing the remote monitoring function of the cloud master station on the flexible interconnected device.

6. The on-site real-time control system based on multi-area flexible interconnection of area intelligent fusion terminals according to claim 1 is characterized by: The expansion module communicates with the core board of the station area fusion terminal through a USB interface to achieve data sharing and receive external control instructions from the application software in the core board.

7. The on-site real-time control system based on multi-area flexible interconnection of area intelligent fusion terminals according to claim 1 is characterized by: The substation fusion terminal acquisition board is equipped with a current transformer and a voltage transformer, which are responsible for real-time collection of analog data of line current and voltage, and converting them into analog data within the range of the metering chip. The metering chip will perform digital-to-analog conversion on the analog data and forward it to the substation fusion terminal main control board through the waveform DMA interface in real time, and then the substation fusion terminal main control board will transparently forward it to the expansion module. The expansion module will then receive the sampled waveform in real time through the microcontroller SPI interface, package it, and send it to the third-party device, thereby realizing the forwarding function of the sampled waveform sampling data.

8. The on-site real-time control system based on multi-area flexible interconnection of area intelligent fusion terminals according to claim 7 is characterized by: The cross-purchase metering chip adopts a metering chip with one SPI interface and one independent DMA interface. The real-time data of the metering chip is transmitted to the expansion module through DMA, and the expansion module transmits the data to the flexible interconnection coordination control board through optical fiber signals.

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