System and method for testing reliability of static synchronous phase modifier system on power grid side

Abstract

The invention discloses a system for testing the reliability of a static synchronous phase modifier system on a power grid side, and the system comprises a simulation system which is configured to simulate a converter valve, a super-capacity valve, and switch disconnecting link equipment in an AC power grid and a static synchronous phase modifier; the control system is configured to realize the functions of power and voltage control and sequential logic control of the static synchronous phase modifier; and the protection system is configured to realize the protection function of the alternating current wiring area, the converter valve area and the super-capacity valve area. The invention further discloses a method for testing and evaluating the reliability of the grid-side static synchronous phase modifier system, which comprises the following steps of: performing a single function test; and performing system function tests including a control test, a protection test, an interface test and a self-checking test. According to the invention, the problems of incomplete test verification environment and incomplete test verification items in the prior art can be solved, comprehensive and reliable test verification of the static synchronous phase modifier system function is realized, and the running reliability of the static synchronous phase modifier is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of grid-connected control, and in particular relates to a reliability testing system and method for a grid-side static synchronous condenser system. Background Art

[0002] A static synchronous condenser (SC) is a static VAR compensation device based on power electronics technology, providing reactive power and inertia support for AC systems. The reactive power control stage modulates the voltage amplitude within the converter output, providing capacitive and inductive reactive power to the AC system. During transient AC system faults, the SC naturally responds to the fault by outputting short-circuit current to support the AC system voltage. Furthermore, by employing virtual synchronous control techniques, the SC output phase angle is controlled to release energy stored in excess capacitance, providing inertia support for the AC system and enhancing transient stability.

[0003] However, the inventors of this application have discovered that the application of SGCS in power grids is still in its infancy. Issues exposed during on-site system commissioning indirectly reflect the inadequacy of existing SGCS system functional simulation test and verification environments, incomplete testing and verification items, and inadequate test result evaluation. These issues hinder the high reliability requirements of SGCS systems imposed by power grids. Therefore, we propose a reliability testing method for grid-side SGCS systems. Summary of the Invention

[0004] The purpose of the present invention is to provide a reliability testing system and method for a grid-side static synchronous condenser system, which can solve the problems of imperfect existing test and verification environment and incomplete test and verification items, realize comprehensive and reliable test and verification of the functions of the static synchronous condenser system, and improve the reliability of the operation of the static synchronous condenser.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A reliability test system for a grid-side static synchronous condenser system, comprising:

[0007] The simulation system is configured to simulate the converter valves, over-capacity valves, and switch blades in the AC power grid and the static synchronous condenser;

[0008] A control system configured to implement power and voltage control and sequential logic control functions of a static synchronous condenser; and

[0009] The protection system is configured to realize the protection functions of the AC connection area, the converter valve area, and the over-capacity valve area.

[0010] The above simulation system includes:

[0011] The first simulation system is configured to simulate the AC power grid and the converter valves and the over-capacity valves in the static synchronous condenser;

[0012] A second simulation system is configured to simulate a knife switch device in a static synchronous condenser, and

[0013] The interface device is configured to realize signal transmission between the first simulation system, the second simulation system and the control system and the protection system.

[0014] The above-mentioned control system and protection system adopt a three-layer architecture, namely the operator control layer, the control and protection equipment layer, and the on-site measurement and control layer; among them, the operator control layer includes the operator workstation, the engineer workstation and the maintenance workstation to realize the operation mode and operation status control of the static synchronous phase condenser system and the compilation and debugging of the device function software; the control and protection equipment layer adopts the same control and protection equipment as the site, and the wiring method between the equipment is the same as the on-site wiring method. The valve interface device is configured to simulate the opening of the valve module command; the on-site measurement and control layer adopts the measurement and control device consistent with the site to realize the acquisition of the switch knife status, the transmission of instructions and analog signals, and the configuration of the measurement and control device corresponds to the device configuration of the control and protection equipment layer.

[0015] The above control system adopts a dual configuration, and the protection system adopts a triple configuration.

[0016] A reliability testing method for a grid-side static synchronous condenser system comprises the following steps:

[0017] Step 1: Perform single function test;

[0018] Step 2: Perform system function tests, including control tests, protection tests, interface tests, and self-test tests.

[0019] The above-mentioned control tests include transient and steady-state characteristic tests, phase angle jump tests, inertia support, and AC system fault ride-through tests; protection tests include AC connecting line area, converter valve area, over-capacity valve area fault and protection outlet tests; interface tests include trip outlet tests, system switching tests, and optical fiber break tests; self-test tests include single power supply failure and dual power supply failure simulation tests, redundant system fault switching tests, optical fiber break simulation tests, analog measurement anomaly tests, and switch node input anomaly tests.

[0020] A reliability assessment method for a grid-side static synchronous condenser system includes the following steps:

[0021] Step 1: Establish the control test result score row vector Kc;

[0022] Step 2: Establish the protection test result column vector Kp;

[0023] Step 3, establish the correlation matrix Mcp;

[0024] Step 4, obtaining the overall reliability test score Stest;

[0025] The control test result score row vector Kc is a row vector of the scores of each link of the control test arranged in sequence, the protection test result column vector K is a column vector of the scores of each link of the protection test arranged in sequence, and the correlation matrix Mcp is the influence coefficient matrix of the corresponding control link and protection link;

[0026] The overall reliability test score is calculated by the following formula

[0027] Stest=Kc*Mcp*Kp.

[0028] The calculation formula of the above control test result score row vector Kc is,

[0029] Kc=[kc1,kc2,kc3,kc4]

[0030] in,

[0031] kc1 is the step test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and a step test is performed under each operating condition. The value of kc1 is increased by 1 every time a condition is satisfied.

[0032] kc2 is the phase angle jump test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and a phase angle jump test is performed under each operating condition. The value of kc2 is increased by 1 every time a working condition is met;

[0033] kc3 is the inertia support score, with an initial value of 0. The system working conditions are divided into at least 9 working conditions, and an inertia support test is performed under each working condition. The kc3 value is increased by 1 every time a working condition is met;

[0034] kc4 is the AC system fault ride-through test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and a flow system fault ride-through test is performed under each operating condition. The kc4 value is increased by 1 every time a condition is met.

[0035] The calculation formula of the column vector Kp of the above protection test results is:

[0036] Kp=[kp1,kp2,kp3]'

[0037] in,

[0038] kp1 is the AC connection line area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the AC connection line area protection test is performed under each operating condition. The kp1 value is increased by 1 every time a working condition is met;

[0039] kp2 is the converter valve area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the converter valve area protection test is performed under each operating condition. The kp2 value is increased by 1 every time a condition is met;

[0040] kp3 is the over-capacity valve area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the over-capacity valve area protection test is performed under each operating condition. The kp3 value is increased by 1 every time a condition is met.

[0041] The number of rows and columns of the above correlation matrix Mcp satisfies the scoring calculation formula of the overall reliability test score.

[0042] After adopting the above solution, compared with the prior art, the beneficial effects of the present invention are:

[0043] (1) This invention proposes, for the first time, an in-plant testing system architecture for a STATCOM system. This method systematically addresses various technical issues encountered during on-site commissioning. The technical approach provided by this method effectively completes the testing and verification of all levels of STATCOM system functionality, improving the reliability and safety of the entire STATCOM system.

[0044] (2) This invention proposes, for the first time, an in-factory testing and verification method for a STATCOM system. This method comprehensively verifies the system's self-test, control logic, and protection logic, ensuring operational reliability, correct transient and steady-state response, and reliable protection operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a typical static synchronous condenser wiring diagram;

[0046] Figure 2 This is a schematic diagram of the control and protection system of a static synchronous condenser;

[0047] Figure 3 It is a closed-loop simulation system for testing static synchronous condenser;

[0048] Figure 4 This is the functional test step of the static synchronous condenser system;

[0049] Figure 5 It is a test and verification project for static synchronous condenser. DETAILED DESCRIPTION

[0050] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] The present invention provides a reliability test method for a grid-side static synchronous condenser system, which is used to comprehensively verify the self-checking logic, switch interlocking logic, sequence control logic, power control, and regional protection of the control and protection system. The tested static synchronous condenser primary system topology is as follows: Figure 1 As shown in the figure, the static synchronous condenser is generally divided into two areas: AC side and DC side. The main equipment on the AC side includes AC switch, starting resistor, bypass switch and connecting knife switch, etc.; the main equipment on the DC side includes converter valve, over-capacity valve and DC side connecting switch knife switch, etc.

[0052] Among them, AC switches, bypass switches, connecting knife switches and other equipment assist in realizing the connection and isolation of static synchronous phase regulators, and the online activation and deactivation of over-capacity valves.

[0053] The converter valve utilizes a dual-star parallel structure, with each phase consisting of two upper and lower bridge arms. Each arm utilizes a full-bridge or full-half-bridge hybrid sub-module connected in series. Each arm is connected in series with a smoothing reactor to suppress harmonic and fault currents. A current transformer is installed in each arm to collect the current flowing through it, and a voltage transformer is installed on the DC side of the converter valve to collect the DC voltage.

[0054] The overcapacity valve is connected in parallel with the converter valve via a DC-side switch. By releasing energy from the energy storage unit, the valve provides inertia support for the AC system and maintains the DC-side operating voltage. By controlling the DC-side switch, the valve provides online activation and deactivation capabilities. The overcapacity valve can be used in a single-branch or multi-branch parallel configuration. Each branch is connected in series with a smoothing reactor to suppress harmonic and fault currents. Current transformers are installed in each branch to collect current flowing through the branch, enabling branch protection and monitoring.

[0055] like Figure 2 The figure shows the structure diagram of the secondary control and protection system of the static synchronous condenser. The control and protection system adopts a three-layer structure design, namely the operator control layer, the control and protection equipment layer, and the equipment interface layer. Among them, the operator control layer includes the operator workstation, the engineer workstation and the maintenance workstation, which realize the control of the operation mode and operation status of the static synchronous condenser system and the compilation and debugging of the device function software. The server configuration, network layout and monitoring system design of the operator control layer adopt a structure consistent with the actual project, using a dual-network redundant connection method.

[0056] The control and protection equipment layer control, the configuration of the protection device and the wiring between the devices and between layers are the same as the actual project. The same control and protection equipment as the site is used, the wiring method between the devices is the same as the on-site wiring method, and the valve interface device is configured to simulate the input of the valve sub-module command.

[0057] The field interface layer adopts a measurement and control device consistent with the field to realize the acquisition of switch status, transmission of instructions and analog signals, etc. The configuration of the measurement and control device corresponds to the configuration of the control and protection equipment layer.

[0058] The control system is configured in dual configuration, the protection system is configured in triple configuration, with independent valve layer protection, and independent configuration of converter valve and over-capacity valve protection.

[0059] like Figure 3 The figure shows the structure of the closed-loop simulation system for static synchronous condenser testing. The system includes a primary equipment simulation system and a secondary control and protection system. The primary equipment simulation system simulates devices such as converter valves, over-capacity valves, starting resistors, and connection knife switches. The converter valve simulation uses a dedicated FPGA module to simulate the switching of each sub-module in the bridge arm and the dynamic changes of the capacitor voltage. The over-capacity valve simulation uses a dedicated FPGA module to simulate the switching of each sub-module in the bridge arm and the dynamic changes of the supporting capacitor voltage and the energy storage module voltage.

[0060] Among them, the primary equipment simulation link can realize the dynamic process simulation of all switches in the static synchronous phase condenser system, and the configuration and wiring method of the secondary control protection system are consistent with the actual project.

[0061] Figure 3 The closed-loop simulation system composed of the primary equipment simulation link and the secondary control protection system can simulate and verify the sequential control of the static synchronous phase condenser system as well as the system's transient and steady-state characteristic test verification, protection function test verification, device self-test logic test, and peripheral interface test verification.

[0062] The present invention also provides an in-plant test system for a grid-side static synchronous condenser, including an RTDS simulation system for simulating primary equipment such as an AC power grid, a converter valve, an over-capacity valve, and a switch knife; a control system for implementing functions such as power and voltage control and sequential logic control of the static synchronous condenser; and a protection system for implementing protection of the AC connection area, the converter valve area, and the over-capacity valve area.

[0063] Among them, the RTDS simulation system includes RTDS equipment that simulates the AC power grid, converter valves, over-capacity valves, and switch knife devices. The switch knife devices can also be simulated using dedicated simulation devices, as well as interface devices that realize signal transmission between the control and protection devices and the RTDS equipment.

[0064] like Figure 4 The figure shows the functional test steps of the static synchronous condenser system, which is divided into 5 steps. Before carrying out the specific system functional test, the device has completed the step 1 single unit functional test.

[0065] Step 2: Conduct signal input / output testing and analog acquisition function testing of the static synchronous condenser system. This includes verifying switch status signals, trip and other protection action signals, unlocked / locked status signals, and analog measurement verification of valve-side voltage / current, bridge arm current, and DC-side voltage / current.

[0066] Step 3: Conduct self-test verification of the static synchronous condenser system. This includes redundant control system switching, minor, major, and emergency fault testing and verification, protection device fault self-test verification, and analog acquisition anomaly self-test verification.

[0067] Step 4.1, carry out control function test verification. And establish the performance test score vector Kc

[0068] Kc=[kc1,kc2,kc3,kc4]

[0069] in,

[0070] kc1 is the step test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and a step test is performed under each operating condition. The value of kc1 is increased by 1 every time a condition is met;

[0071] kc2 is the phase angle jump test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and a phase angle jump test is performed under each operating condition. The value of kc2 is increased by 1 every time a condition is satisfied;

[0072] kc3 is the inertia support score, with an initial value of 0. The system working conditions are divided into at least 9 working conditions, and an inertia support test is performed under each working condition. The kc3 value is increased by 1 every time a working condition is met;

[0073] kc4 AC system fault ride-through test score, the initial value is 0, the system working conditions are divided into at least 9 working conditions, the flow system fault ride-through test is performed under each working condition, and the kc4 value is increased by 1 every time a working condition is met;

[0074] Step 4.2: Carry out protection function test verification. The protection test result column vector Kp is characterized by:

[0075] Kp=[kp1,kp2,kp3]'

[0076] in,

[0077] kp1 is the AC connection line area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the AC connection line area protection test is performed under each operating condition. The kp1 value is increased by 1 every time a working condition is met;

[0078] kp2 is the converter valve area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the converter valve area protection test is performed under each operating condition. The kp2 value is increased by 1 every time a condition is met;

[0079] kp3 is the over-capacity valve area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the over-capacity valve area protection test is performed under each operating condition. The kp3 value is increased by 1 every time a working condition is met;

[0080] Step 5: Conduct peripheral interface functional testing and verification, including testing and verification of the converter valve, over-capacity valve, and valve cooling interface.

[0081] This embodiment provides a correlation matrix Mcp, whose values ​​are as follows

[0082]

[0083] The reliability test score is calculated as follows:

[0084] Stest=Kc*Mcp*Kp

[0085] like Figure 5 The figure shows a schematic diagram of the test and verification project for a static synchronous phase condenser, which includes control test, protection test, interface test and self-test test. In addition to the conventional transient and steady-state characteristic test, the control test project includes phase angle jump test, inertia support and AC system fault ride-through test; the protection test includes AC connecting line area, converter valve area, over-capacity valve area fault and protection outlet test; the interface test project includes trip outlet test, system switching test and optical fiber break test; the self-test test project includes single power supply fault, dual power supply fault simulation test, redundant system fault switching test, optical fiber break simulation test, analog measurement abnormality test and switch node input abnormality test.

[0086] It will be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0087] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0088] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0089] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0090] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0091] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A reliability test system for a grid-side static synchronous condenser system, characterized by: include, The simulation system is configured to simulate the converter valves, over-capacity valves, and switch blades in the AC power grid and the static synchronous condenser; The control system is configured to realize the functions of power and voltage control and sequential logic control of the static synchronous phase condenser; and the protection system is configured to realize the functions of protecting the AC connection area, the converter valve area, and the over-capacity valve area.

2. The system according to claim 1, wherein: The simulation system includes: The first simulation system is configured to simulate the AC power grid and the converter valves and the over-capacity valves in the static synchronous condenser; A second simulation system is configured to simulate a knife switch device in a static synchronous condenser, and The interface device is configured to realize signal transmission between the first simulation system, the second simulation system and the control system and the protection system.

3. The system according to claim 1, wherein: The control system and protection system adopt a three-layer architecture, namely the operator control layer, the control and protection equipment layer, and the on-site measurement and control layer; among them, the operator control layer includes the operator workstation, the engineer workstation and the maintenance workstation to realize the operation mode and operation status control of the static synchronous phase condenser system and the compilation and debugging of the device function software; the control and protection equipment layer adopts the same control and protection equipment as the on-site, the wiring method between the equipment is the same as the on-site wiring method, and the valve interface device is configured to simulate the opening and closing of the valve sub-module command; the on-site measurement and control layer adopts the measurement and control device consistent with the on-site to realize the acquisition of the switch knife status, the transmission of instructions and analog signals, and the configuration of the measurement and control device corresponds to the device configuration of the control and protection equipment layer.

4. The system according to claim 1, wherein: The control system adopts a dual configuration, and the protection system adopts a triple configuration.

5. A reliability test method for a grid-side static synchronous condenser system, characterized in that The steps include: Step 1: Perform single function test; Step 2: Perform system function tests, including control tests, protection tests, interface tests, and self-test tests.

6. The method according to claim 5, wherein: The control test includes transient and steady-state characteristic test, phase angle jump test, inertia support, and AC system fault ride-through test; the protection test includes AC connecting line area, converter valve area, over-capacity valve area fault and protection outlet test; the interface test includes trip outlet test, system switching test and optical fiber break test; the self-test test includes single power supply fault, dual power supply fault simulation test, redundant system fault switching test, optical fiber break simulation test, analog measurement abnormality test, and switch knife node input abnormality test.

7. A reliability assessment method for a grid-side static synchronous condenser system, characterized in that The steps include: Step 1: Establish the control test result score row vector Kc; Step 2: Establish the protection test result column vector Kp; Step 3, establish the correlation matrix Mcp; Step 4, obtaining the overall reliability test score Stest; The control test result score row vector Kc is a row vector of the scores of each link of the control test arranged in sequence, the protection test result column vector K is a column vector of the scores of each link of the protection test arranged in sequence, and the correlation matrix Mcp is the influence coefficient matrix of the corresponding control link and protection link; The overall reliability test score is calculated by the following formula Stest=Kc*Mcp*Kp.

8. The method according to claim 7, wherein: The calculation formula of the control test result score row vector Kc is: Kc=[kc1,kc2,kc3,kc4] in, kc1 is the step test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and a step test is performed under each operating condition. The value of kc1 is increased by 1 every time a condition is met; kc2 is the phase angle jump test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and a phase angle jump test is performed under each operating condition. The value of kc2 is increased by 1 every time a working condition is met; kc3 is the inertia support score, with an initial value of 0. The system working conditions are divided into at least 9 working conditions, and an inertia support test is performed under each working condition. The kc3 value is increased by 1 every time a working condition is met; kc4 is the AC system fault ride-through test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and a flow system fault ride-through test is performed under each operating condition. The kc4 value is increased by 1 every time a condition is met.

9. The method according to claim 7, wherein: The calculation formula of the protection test result column vector Kp is: Kp=[kp1,kp2,kp3]' in, kp1 is the AC connection line area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the AC connection line area protection test is performed under each operating condition. The kp1 value is increased by 1 every time a working condition is met; kp2 is the converter valve area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the converter valve area protection test is performed under each operating condition. The kp2 value is increased by 1 every time a condition is met; kp3 is the over-capacity valve area protection test score, with an initial value of 0. The system operating conditions are divided into at least 9 operating conditions, and the over-capacity valve area protection test is performed under each operating condition. The kp3 value is increased by 1 every time a condition is met.

10. The method according to claim 7, wherein: The number of rows and columns of the correlation matrix Mcp satisfies the scoring calculation formula of the overall reliability test score.

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