Closed-loop verification platform construction method and system for power grid safety and stability control technology

Abstract

The invention relates to the technical field of power systems and automation, in particular to a power grid safety and stability control technology closed-loop verification platform construction method and system. According to the flexible construction method of the closed-loop verification platform, a safety and stability control system is classified and reconstructed according to different functional assemblies, assembly interfaces of all functional areas are collected into one area, and flexible combination of different functional units is achieved through optical fiber jumpers. The method has the beneficial effects that a large amount of wiring and platform debugging work in a traditional construction method is converted into simple optical fiber patch cord and channel configuration, so that standardized configuration of a closed-loop verification platform in a laboratory environment is realized, and switching among different experiment systems can be quickly completed; the manual investment in the process of constructing the power grid safety and stability control system hardware-in-the-loop experiment platform is greatly reduced, the experiment preparation time is greatly shortened, and the experiment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of power systems and automation technology, and in particular to a method and system for constructing a closed-loop verification platform for power grid safety and stability control technology. Background Art

[0002] The power grid safety and stability control system covers a wide area, has multiple control levels (including the main station level, master station level, coordination substation level, execution station level and user terminals), multiple sites, and various control methods (including DC power modulation, pumped storage and pump cutting, generator cutting and load cutting, etc.). The simplified small-scale system closed-loop test based on the ideal power supply or the single-device level open-loop test method based on the signal generator has played an important role in equipment research and development, criterion verification, control system network access inspection and power grid production and operation for many years. It is still the main means of conducting in-factory testing of control devices and fault diagnosis / location; however, it is difficult to apply it to the closed-loop test of the power grid safety and stability control system because it cannot truly reflect the changes in the dynamic stability characteristics of the primary power grid after a fault and the effect of the control system executing emergency control measures on the transient safety and stability of the system. The traditional test method also has the following shortcomings:

[0003] First, the workload of platform construction is large, the wiring between devices is complex, and it takes a long time. If the power grid safety and stability control system experimental verification platform is constructed according to the "one experiment, one platform" plan, the device wiring work during the construction process includes: wiring between chassis in the same cabinet, signal wiring from real-time simulation equipment to power amplifiers, analog and switch input and output wiring from power amplifiers to safety and stability control devices, and multi-level station channel wiring, etc. The construction of a regional power grid safety and stability control system closed-loop verification platform requires at least 400 people / day. Due to the large number of device wiring, poor line layout during platform construction can easily increase the difficulty of later debugging and diagnosis, and temporary wiring is also prone to loose interfaces and falling off, seriously affecting the efficiency of experimental work.

[0004] Second, the investment in auxiliary simulation equipment resources is large. In order to verify the effectiveness of the action criteria of the power grid safety and stability control system, the correctness of the control strategy and the reliability of the action, it is necessary to collect a large amount of bus voltage, branch current or power information from the real-time digital simulation model of the primary power grid. The traditional experimental scheme uses a power amplifier connected to the control device. For the closed-loop verification of the power grid safety and stability control system, the number of power amplifiers required for the experiment is huge.

[0005] Third, the experimental environment is difficult to maintain. Due to the limitations of laboratory simulation resources and space, the closed-loop verification platform built for specific experimental needs is often difficult to retain for a long time, resulting in low utilization of the experimental platform; moreover, since the experimental environment cannot be rebuilt in a short period of time, it is impossible to respond to the actual production and operation needs of the power grid in a timely manner.

[0006] Therefore, there is an urgent need for a flexible construction method and system for a closed-loop verification platform for power grid safety and stability control technology, which can significantly shorten the platform construction time, reduce the workload of wiring between devices, realize the rapid construction of a control system-level hardware-in-the-loop experimental verification platform and flexible switching of different experimental system environments, and comprehensively improve the experimental efficiency. Summary of the invention

[0007] In view of the above existing technical problems, the present invention is proposed.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for constructing a closed-loop verification platform for power grid safety and stability control technology, which includes splitting each safety and stability control device into a main control unit, a sampling unit and a communication unit according to its function;

[0009] The same units are concentrated in the same cabinet, and the cabinets with the same functions are arranged in the same area to form the main control unit area, sampling unit area, and communication unit area;

[0010] The sampling unit of the safety and stability control device directly reads the low-level signal output by the real-time digital simulation device;

[0011] The sampling cabinet includes a plurality of I\O interface boards, and the output ports of the plurality of I\O interface boards are connected to the input ports of the sampling unit;

[0012] The data transmitted by each of the communication units is integrated into a synchronous digital system device to form a communication network;

[0013] Centrally deploying real-time digital simulation equipment to form a real-time digital simulation area, wherein the real-time digital simulation area and the sampling unit area transmit signals to each other;

[0014] The transmission data of the main control unit area, the sampling unit area, the communication unit area and the real-time digital simulation area are concentrated in the conversion area, and the conversion area is connected with each of the functional areas by using optical fiber jumpers.

[0015] As a preferred solution of the method for constructing a closed-loop verification platform for power grid safety and stability control technology of the present invention, a single cabinet includes at least one of the main control unit, the sampling unit or the communication unit, forming a main control unit cabinet, a sampling unit cabinet, and a communication unit cabinet.

[0016] As a preferred solution of the method for constructing a closed-loop verification platform for power grid safety and stability control technology of the present invention, the sampling unit is an A / D sampling module of the safety and stability control device, and the sampling unit and the I\O interface board of the digital simulation device directly read the -10V~+10V level signal output by the I\O interface board.

[0017] As a preferred solution of the method for constructing a closed-loop verification platform for power grid safety and stability control technology of the present invention, wherein: the communication unit is connected to a synchronous digital system device via a coaxial cable, and a plurality of the synchronous digital system devices form a communication network using optical fiber; each of the safety and stability control devices realizes point-to-point communication based on a high-level data link control protocol, and the encoding method is consistent with the actual inter-station communication encoding method of the safety and stability control device.

[0018] The present invention also provides a system constructed by adopting the closed-loop verification platform construction method of power grid safety and stability control technology, including a main control unit module, a sampling unit module, a communication unit module, a real-time digital simulation module and an optical fiber interface conversion module;

[0019] The main control unit module will receive the power grid operation data provided by the sampling unit module, transmit the event information to the communication unit module, and after the communication unit module processes the data, it will be connected to the synchronous digital system equipment and then transmitted to the safety and stability control device. The real-time digital simulation module will exchange data with the sampling unit module; the optical fiber interface conversion module will serve as a connection hub, combining each of the modules and data interaction.

[0020] As a preferred solution for the closed-loop verification platform construction system of the power grid safety and stability control technology of the present invention, the main control unit module is composed of multiple safety and stability control device main control units, and the main control unit is used to receive and process data according to a preset state.

[0021] As an optimal solution for constructing a closed-loop verification platform for power grid safety and stability control technology of the present invention, the sampling unit module is composed of multiple safety and stability control device sampling units and a real-time digital simulation device IO interface board; the sampling unit is responsible for A / D sampling, input / frequency acquisition, fault judgment, etc. of the safety and stability control device; the IO interface board is responsible for two-way interaction of data.

[0022] As a preferred solution for the closed-loop verification platform construction system of the power grid safety and stability control technology of the present invention, the communication unit module is composed of multiple safety and stability control device communication units, and the communication unit is used to convert the data transmitted by the main control unit through the optical fiber interface, and connect to the synchronous digital system equipment, and transmit it to the safety and stability control device of the opposite site through the communication network.

[0023] As an optimal solution for the closed-loop verification platform construction system of the power grid safety and stability control technology of the present invention, the real-time digital simulation module is composed of multiple real-time digital simulation devices, the real-time digital simulation devices are used for model building and operation characteristic simulation, and the real-time digital simulation module receives the signal of the safety and stability control device to simulate the entire process of the event.

[0024] As a preferred solution for the closed-loop verification platform construction system of the power grid safety and stability control technology of the present invention, the optical fiber interface conversion module is composed of a main control unit interface, a sampling unit interface, a communication unit interface, a real-time digital simulation interface and an optical fiber conversion interface, and each of the interfaces is configured in a partition, and the optical fiber interface conversion module is jumper-connected with the main control unit module, the sampling unit module, the communication unit module and the real-time digital simulation module.

[0025] The beneficial effects of the method and system for constructing a closed-loop verification platform for power grid safety and stability control technology of the present invention are as follows: classification and reconstruction are performed according to different functional components, the component interfaces of each functional area are gathered into one area, and the flexible combination of different functional units is realized through optical fiber jumpers. The rapid construction of the control system-level hardware-in-the-loop experimental verification platform and the flexible switching of different experimental system environments are realized, which comprehensively improves the experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 It is the closed-loop verification platform architecture of the existing power grid safety and stability control system in the present invention.

[0028] Figure 2 The present functional layout of the equipment cabinets at each site in the safety and stability control system of the present invention.

[0029] Figure 3 The sampling modes before and after the transformation of the safety and stability control device in the present invention.

[0030] Figure 4 It is a standardized sampling module for the closed-loop verification platform of the safety and stability control system in the present invention.

[0031] Figure 5 The different functional units and their connection methods after reconstruction of the closed-loop verification platform of the safety and stability control system in the present invention.

[0032] Figure 6 It is a schematic diagram of rapid switching of a closed-loop verification platform for a safety and stability control system in the present invention. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0036] Example 1, reference Figure 1 to Figure 6 , which is the first embodiment of the present invention, and provides a method for constructing a closed-loop verification platform for power grid security and stability control technology.

[0037] For the existing closed-loop experimental platform of power grid control technology, this paper will implement the flexible construction of the closed-loop verification platform according to the steps of functional decomposition-configuration reconstruction-standardized design-multi-system switching; including:

[0038] S1. Separate each safety and stability control device into a main control unit, a sampling unit and a communication unit according to its function;

[0039] According to the functional layout of the safety and stability control device, each safety and stability control device is divided into a main control unit part, a sampling unit part and a communication unit part, wherein the sampling unit and the communication unit are connected to the main control unit through optical fibers.

[0040] S2. Distribute the same units in the same cabinet, and arrange the cabinets with the same functions in the same area to form a main control unit area, a sampling unit area, and a communication unit area;

[0041] The same type of functional components are concentrated in one cabinet, and configured according to the principle of several main control units or several sampling units or several communication units in one cabinet to form a main control unit cabinet, a sampling unit cabinet, and a communication unit cabinet; the same type of cabinets are concentrated in one area to form a main control unit area, a sampling unit area, and a communication unit area.

[0042] S3, the sampling unit of the safety and stability control device directly reads the low-level signal output by the real-time digital simulation device;

[0043] The sampling unit is modified so that the A / D sampling unit of the safety and stability control device can directly read the real-time digital simulation device and output the -10V~+10V level signal through the I / O interface board, thereby realizing the direct connection between the I / O interface board and the A / D sampling unit.

[0044] S4, the sampling cabinet includes a plurality of I\O interface boards, and the output ports of the plurality of I\O interface boards are connected to the input ports of the sampling units;

[0045] The I / O interface board and the A / D sampling unit of the safety and stability control device are combined and installed in a sampling cabinet in a certain proportion, and the output port of the I / O interface board is fixedly connected to the input port of the sampling unit to form a standardized sampling module.

[0046] S5, integrating the data transmitted by each communication unit into the synchronous digital system equipment to form a communication network;

[0047] The 2M interface of the communication unit of the safety and stability control device is connected to the SDH (Synchronous Digital Hierarchy) equipment through a coaxial cable. Multiple SDH devices use optical fiber to form a communication network. The SDH control software is used to adjust the connection relationship between different SDH devices. A large amount of wiring and connection work is transformed into point-to-point configuration operations on the software interface, thereby realizing flexible configuration of communication channels between stations of different safety and stability control systems to be tested. The inter-station communication is based on the High-Level Data Link Control (HDLC) protocol to realize point-to-point communication. The encoding method is consistent with the actual inter-station communication encoding method of the safety and stability control device, and the receiving and sending rate is 600 frames / s.

[0048] S6. Centrally deploy real-time digital simulation equipment to form a real-time digital simulation area, and the real-time digital simulation area and the sampling unit area transmit signals to each other;

[0049] The connection optical ports of components in each functional area, such as the main control unit area, the sampling unit area, the communication unit area and the real-time digital simulation area, are gathered in the optical fiber interface conversion area, and optical fiber jumpers are used to achieve flexible combination of components in different areas.

[0050] S7. The transmission data of the main control unit area, sampling unit area, communication unit area and real-time digital simulation area are concentrated in the conversion area, and the conversion area is connected to each functional area by optical fiber jumpers.

[0051] A safe and stable control experimental system with different functional characteristics is constructed by multiple different area components. Rapid switching between different experimental systems can be quickly completed by simply adjusting the jumper connection between the sampling unit and the real-time digital simulation unit in the optical fiber interface conversion area.

[0052] A single cabinet includes at least one main control unit, sampling unit or communication unit, forming a main control unit cabinet, a sampling unit cabinet, and a communication unit cabinet.

[0053] The sampling unit and the I\O interface card of the digital simulation device directly read the -10V~+10V level signal output by the I\O interface card.

[0054] The communication unit is connected to the synchronous digital system equipment through a coaxial cable, and multiple synchronous digital system equipment uses optical fiber to form a communication network; each safety and stability control device realizes point-to-point communication based on the advanced data link control protocol, and the encoding method is consistent with the actual safety and stability control device station-to-station communication encoding method.

[0055] Example 2, reference Figure 1 to Figure 6 , which is the second embodiment of the present invention, and this embodiment further provides a method for constructing a closed-loop verification platform for power grid security and stability control technology.

[0056] Reference Figure 1 The existing power grid safety and stability control system mainly includes three parts: real-time digital simulation equipment, IO interface board, and safety and stability control device. Among them, the real-time digital simulation equipment is used to build the power grid model and simulate the operation characteristics. The real-time digital simulation equipment is connected to the IO interface board through optical fiber, and the power grid operation status information is sent to the device sampling unit in real time through the IO interface board. After the device identifies the power grid fault, the main control unit searches the strategy table and sends control commands to each site through the communication network. The device at each site feeds back the action signal to the real-time digital simulation equipment through the IO board, completing the simulation of the whole process from power grid fault triggering to control command execution.

[0057] At present, the mainstream control device cabinet functional layout used in power grid safety and stability control systems can be seen in Figure 2 According to the difference in functions, the safety and stability control device can be divided into three parts, namely: main control unit part, sampling unit part, and communication unit part. Among them, each device of the main control unit is equipped with a chassis, which is a functional feature of the safety and stability control system. The number of sampling chassis and communication chassis configured at each site device is different. Therefore, when building different experimental system environments, it is necessary to readjust the sampling chassis and communication chassis configuration of different site devices according to engineering requirements.

[0058] According to the functional composition of the existing control device, the components of the device cabinet are decomposed. The same type of functional components are concentrated in one cabinet, and three main control units are assembled in one cabinet, three sampling units are assembled in one cabinet, and seven communication units are assembled in one cabinet, forming a main control unit cabinet, a sampling unit cabinet, and a communication unit cabinet; the same type of cabinets are concentrated in one area to form a main control unit area, a sampling unit area, and a communication unit area.

[0059] Reference Figure 3-4, the sampling unit of the safety and stability control device is modified, the AC sampling module is removed, and the A / D sampling unit of the device is directly connected to the I / O interface card of the digital simulation device. The A / D sampling unit of the device can read the -10V~ and +10V level signals output by the real-time digital simulation device through the I / O interface card, and the real-time information interaction between the real-time digital simulation device and the safety and stability control device can be realized without passing through a power amplifier; the I / O interface card and the A / D sampling unit of the safety and stability control device are installed in a cabinet in a certain proportion, and the output port of the I / O interface card is fixedly connected to the input port of the sampling unit to form a standardized sampling module.

[0060] The 2M interface of the communication component of the safety and stability control device is connected to the SDH (Synchronous Digital Hierarchy) equipment through a coaxial cable. Multiple SDH devices use optical fibers to form a communication network. The connection relationship between different SDH devices is adjusted using SDH control software to achieve flexible configuration of the communication channels between stations of different safety and stability control systems to be tested. The inter-station communication is based on the High-Level Data Link Control (HDLC) protocol to achieve point-to-point communication. The encoding method is consistent with the actual inter-station communication encoding method of the safety and stability control device, and the transmission and reception rate is 600 frames / s.

[0061] Reference Figure 5 The connection optical ports of the components in the main control unit area, sampling unit area and communication unit area are gathered in the optical fiber interface conversion area. According to the configuration of the devices at each site of the safety and stability control system to be tested, flexible combination of components in different areas is achieved through optical fiber jumpers to quickly build a safety and stability control system experimental environment; all real-time digital simulation equipment is centrally deployed in one area to form a real-time digital simulation area, and gathered to the optical fiber interface conversion area through optical fiber to interact with the sampling unit area for data.

[0062] Reference Figure 6 Real-time digital simulation equipment is expensive and the simulation scale is limited. The above sampling method can combine multiple different regional components according to the safety and stability control system with different functional architectures to form multiple safety and stability control experimental system environments for testing. It only needs to adjust the jumper connection between the sampling unit and the real-time digital simulation unit in the optical fiber interface conversion area to quickly complete the fast switching between different experimental systems.

[0063] Example 3, reference Figure 1 to Figure 6 , which is the third embodiment of the present invention, provides a system for constructing a closed-loop verification platform using a power grid safety and stability control technology, including a main control unit module, a sampling unit module, a communication unit module, a real-time digital simulation module and a fiber optic interface conversion module.

[0064] The main control unit module will receive the power grid operation data provided by the sampling unit module, transmit the event information to the communication unit module, and after the communication unit module processes the data, it will be connected to the synchronous digital system equipment and transmitted to the safety and stability control device. The real-time digital simulation module will interact with the sampling unit module for data; the optical fiber interface conversion module will serve as the connection hub, combining various modules and data interaction.

[0065] The main control unit module is composed of multiple safety and stability control device main control units, and the main control unit is used to receive data according to a preset state.

[0066] The main control unit is responsible for event information analysis, decision-making, processing, storage and constant value management, and is the core of the safety and stability control device.

[0067] The sampling unit module is composed of multiple safety and stability control device sampling units and real-time digital simulation equipment IO interface board; among them, the sampling unit is responsible for A / D sampling and input / frequency processing of the safety and stability control device; the IO interface board is responsible for the two-way interaction of data.

[0068] The sampling unit is responsible for A / D sampling, input / frequency acquisition, calculation, fault judgment, export logic, etc. of the safe and stable control device; the IO interface board is responsible for high-speed two-way interaction of analog and switch quantities, and is the key to achieving closed-loop verification of the control device.

[0069] The communication unit is used to convert the data transmitted by the main control unit through the optical fiber interface, connect to the same device, and transmit it to the safety and stability control device of the opposite site through the communication network.

[0070] The real-time digital simulation module is composed of multiple real-time digital simulation devices. The real-time digital simulation devices are used for model building and operation characteristic simulation. The real-time digital simulation module receives the signal of the safety and stability control device and performs event simulation.

[0071] The real-time digital simulation equipment is responsible for building the power grid model and simulating its operating characteristics. It is the data source of the closed-loop verification platform for the safe and stable control system. It can also receive action signals fed back by the device to achieve full-process simulation from power grid fault triggering to control command execution.

[0072] The optical fiber interface conversion module consists of a main control unit interface, a sampling unit interface, a communication unit interface, a real-time digital simulation interface and an optical fiber conversion interface. Each interface is configured in a partition and electrically connected to the corresponding module. The optical fiber interface conversion module is jumpered to the main control unit module, the sampling unit module, the communication unit module and the real-time digital simulation module.

[0073] Different functional interfaces are configured in partitions and are connected one-to-one with each component interface in the above functional modules through optical fibers; flexible combination of different functional modules can be achieved through optical fiber conversion interface jumpers.

[0074] In summary, by converting a large amount of wiring and platform debugging work in the traditional construction method into simple fiber optic jumpers and channel configuration, the standardized configuration of the closed-loop verification platform in the laboratory environment is achieved, and the switching between different experimental systems can be quickly completed, which greatly reduces the manual input in the construction process of the hardware-in-the-loop experimental platform of the power grid safety and stability control system, greatly compresses the experimental preparation time, and improves the experimental efficiency.

[0075] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0076] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0077] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for constructing a closed-loop verification platform for power grid security and stability control technology, characterized by: include, S1. Separate each safety and stability control device into a main control unit, a sampling unit and a communication unit according to its function; S2. Distribute the same units in the same cabinet, and arrange the cabinets with the same functions in the same area to form a main control unit area, a sampling unit area, and a communication unit area; S3, the sampling unit of the safety and stability control device directly reads the low-level signal output by the real-time digital simulation device; S4, the sampling cabinet includes a plurality of I\O interface boards, and the output ports of the plurality of I\O interface boards are connected to the input ports of the sampling unit; S5, integrating the data transmitted by each of the communication units into a synchronous digital hierarchy device to form a communication network; S6, centrally deploying real-time digital simulation equipment to form a real-time digital simulation area, wherein the real-time digital simulation area and the sampling unit area transmit signals to each other; S7, the transmission data of the main control unit area, the sampling unit area, the communication unit area and the real-time digital simulation area are concentrated in the conversion area, and the conversion area is connected to each of the functional areas by using optical fiber jumpers.

2. The method for constructing a closed-loop verification platform for power grid security and stability control technology according to claim 1, characterized in that: A single cabinet includes at least one of the main control unit, the sampling unit or the communication unit, forming a main control unit cabinet, a sampling unit cabinet, and a communication unit cabinet.

3. The method for constructing a closed-loop verification platform for power grid security and stability control technology according to claim 2, characterized in that: The sampling unit is an A / D sampling module of the safety and stability control device. The sampling unit and the I\O interface card of the digital simulation device directly read the -10V~+10V level signal output by the I\O interface card.

4. The method for constructing a closed-loop verification platform for power grid security and stability control technology according to claim 3, characterized in that: The communication unit is connected to the synchronous digital system equipment via a coaxial cable, and multiple synchronous digital system equipment use optical fiber to form a communication network; each of the safety and stability control devices realizes point-to-point communication based on the advanced data link control protocol, and the encoding method is consistent with the actual safety and stability control device station-to-station communication encoding method.

5. A system using the method for constructing a closed-loop verification platform for power grid security and stability control technology as described in any one of claims 1 to 4, characterized in that: It includes a main control unit module, a sampling unit module, a communication unit module, a real-time digital simulation module and an optical fiber interface conversion module; The main control unit module will receive the power grid operation data provided by the sampling unit module, transmit the event information to the communication unit module, and after the communication unit module processes the data, it will be connected to the synchronous digital system equipment and then transmitted to the safety and stability control device. The real-time digital simulation module will exchange data with the sampling unit module; the optical fiber interface conversion module will serve as a connection hub, combining each of the modules and data interaction.

6. The closed-loop verification platform construction system for power grid security and stability control technology according to claim 5, characterized in that: The main control unit module includes a plurality of safety and stability control device main control units, and the main control units are used to receive and process data according to a preset state.

7. The closed-loop verification platform construction system for power grid security and stability control technology according to claim 6, characterized in that: The sampling unit module includes multiple safety and stability control device sampling units and a real-time digital simulation device IO interface board; wherein the sampling unit is responsible for A / D sampling, input / frequency acquisition, fault judgment, etc. of the safety and stability control device; the IO interface board is responsible for two-way data interaction.

8. The closed-loop verification platform construction system for power grid security and stability control technology according to claim 7, characterized in that: The communication unit module includes multiple safety and stability control device communication units, which are used to convert data transmitted by the main control unit through the optical fiber interface, connect to the synchronous digital system equipment, and transmit it to the safety and stability control device of the opposite site through the communication network.

9. The closed-loop verification platform construction system for power grid security and stability control technology according to claim 8, characterized in that: The real-time digital simulation module includes a plurality of real-time digital simulation devices, and the real-time digital simulation devices are used for model building and operation characteristic simulation. The real-time digital simulation module receives the signal of the safety and stability control device and simulates the whole process of the event.

10. The closed-loop verification platform construction system for power grid security and stability control technology according to claim 9, characterized in that: The optical fiber interface conversion module includes a main control unit interface, a sampling unit interface, a communication unit interface, a real-time digital simulation interface and an optical fiber conversion interface. Each of the interfaces is configured in a partition. The optical fiber interface conversion module is jumper-connected with the main control unit module, the sampling unit module, the communication unit module and the real-time digital simulation module.

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