A modular thyristor valve function test device and test method

Abstract

The present application proposes a modular thyristor valve function test device and a test method, wherein the test device includes a basic module and an optional module, and is assembled from all modules in the basic module and any one or more modules in the optional module through interfaces on the modules, and the test device is configured to detect the optional module included in the test device through a power-on self-test, and to enable and disable the test function corresponding to the optional module.

Description

Technical Field

[0001] The present application relates to the field of power systems, and in particular to a testing device and a testing method for performing functional testing on a thyristor valve. Background Art

[0002] Conventional HVDC converter valves are composed of multiple thyristor stages connected in series. Each thyristor stage mainly includes thyristors, damping resistors, damping capacitors, static equalizing resistors, thyristor trigger units (TCUs) and other components. Thyristors are the most core components. They can withstand a voltage of several thousand volts in the off state and can be turned on after receiving a trigger signal at the gate level. Static equalizing resistors are used for voltage balancing between thyristor stages under DC voltage. The main function of damping resistors and damping capacitors is to suppress the reverse voltage overshoot generated on the loop inductance due to current mutation during the thyristor turn-off process. TCU is responsible for the control and protection of the thyristor stage. Under normal operating conditions, TCU sends a feedback signal IP to the valve control unit (VBE) after taking energy in each power frequency cycle, and triggers the thyristor to turn on after receiving the ignition signal FP sent by VBE. In addition to the normal triggering function, the TCU also has forward overvoltage protection and reverse recovery period protection functions. When the thyristor is in the off state or in the reverse recovery period, the TCU detects that the voltage across the thyristor stage exceeds the corresponding protection setting value and generates a protection trigger pulse to force the thyristor to turn on, thereby protecting it from overvoltage damage.

[0003] In order to ensure the stable and reliable operation of the thyristor level and timely discover and eliminate faulty components, it is necessary to conduct regular thyristor level function tests at the project site. The test content includes the impedance, withstand voltage, normal triggering and protection triggering of the thyristor level and other functions and performance. The test occasions are generally before the project is officially put into operation, during routine annual inspections, and after the replacement of key components. Different test occasions correspond to different test project requirements.

[0004] At present, there are two main types of thyristor-level functional test equipment commonly used on engineering sites: one is a full-function tester, which includes all items such as impedance test, low-voltage trigger test, withstand voltage test, and protection trigger test. It is mainly used before the project is officially put into operation and after the replacement of key components. In order to meet the needs of all test items, the full-function tester integrates multiple boards and modules including power supply, control, and voltage signal generator. In terms of structure, all components are fixed into a whole with screws. The equipment is large in size and generally weighs 130~150kg. During the test, it needs to be moved to the aerial platform by a crane or forklift, which is very inconvenient to operate; the other is a low-voltage tester, which only includes items such as impedance test and low-voltage trigger test. Since there is no need for an impulse voltage generator and a high-precision acquisition and control unit, the size and weight are small. It generally adopts a portable suitcase structure and is easy to carry, but it is only used for routine annual inspections and other occasions. It cannot meet the requirements when high-voltage test items are required. Summary of the invention

[0005] The problem to be solved by this application is to propose a modular thyristor valve function tester in view of the shortcomings and deficiencies of the above two testers, which divides the tester into different submodules, each of which corresponds to certain software and hardware functions, is small in size and light in weight, and is easy to move and carry. All submodules can be assembled into a whole through simple and reliable connections, and the assembled tester as a whole can meet all thyristor-level functional test requirements.

[0006] According to one aspect of the present application, a thyristor valve function test device is provided, characterized in that: the test device includes a basic module and an optional module, and is assembled from all modules in the basic module and any one or more modules in the optional module through interfaces on the modules, and the test device is configured to detect the optional module included in the test device through a power-on self-test, and to enable and disable the test function corresponding to the optional module.

[0007] According to some embodiments, the basic module includes a human-machine interface module, a sampling module, a main control module and an export control module, the optional module includes an impedance power supply module, a low-voltage power supply module and a high-voltage power supply module, and the test function includes impedance testing, low-voltage testing and high-voltage testing.

[0008] According to some embodiments, all modules of the basic module are integrated in a chassis, the chassis has a lifting lug, a handle or rollers for movement, and the chassis contains one or more sampling signal interfaces, control signal interfaces and test voltage signal interfaces.

[0009] According to some embodiments, each of the optional modules uses an independent chassis, and the chassis has a lifting lug, a handle or rollers for movement, and the chassis contains one or more sampling signal interfaces, control signal interfaces and test voltage signal interfaces.

[0010] According to some embodiments, each optional module includes at least one voltage generating circuit and one isolation circuit, and the voltage generating circuit is connected to the test voltage signal interface of the module through the isolation circuit.

[0011] According to some embodiments, the outlet control module includes at least three test voltage signal input interfaces, three switch selection circuits and one test voltage signal output interface, each of the test voltage signal input interfaces is respectively connected in series with a switch selection circuit, and multiple series circuits are connected in parallel to the test voltage signal output interface.

[0012] According to some embodiments, the main control module is configured to output a control signal to the optional module and the outlet control module according to the test item, the optional module generates a corresponding test voltage signal and outputs it to the corresponding test voltage signal input interface on the outlet control module, and the switch selection circuit in the outlet control module selects one of the test voltage input signals or the superposition of multiple test voltage input signals as the test voltage output signal of the test device according to the control signal sent by the main control module.

[0013] According to another aspect of the present application, a method for performing a function test using a thyristor valve function test device is provided, characterized in that it comprises the following steps:

[0014] a. Move the basic module to the lifting platform;

[0015] b. Move one or more optional modules to the lifting platform according to the required test functions;

[0016] c. Connect the basic module and the optional module through corresponding interfaces on the lifting platform to form a complete test device;

[0017] d. Start the test;

[0018] e. After the test, release the connection described in step c on the lifting platform;

[0019] f. Move each module from the lifting platform to the ground.

[0020] According to some embodiments, the main control module in the basic module is configured to output a control signal to the optional module and the outlet control module in the basic module according to the test item, the optional module generates a corresponding test voltage signal and outputs it to the corresponding test voltage signal input interface on the outlet control module, and the switch selection circuit in the outlet control module selects one of the test voltage input signals or the superposition of multiple test voltage input signals as the test voltage output signal of the test device according to the control signal sent by the main control module.

[0021] Compared with existing testing equipment, the modular thyristor valve function testing equipment proposed in this application can flexibly select corresponding functional modules according to the on-site testing requirements, and conduct testing after on-site assembly. It can not only ensure that the test function meets the on-site requirements, but also greatly reduce the difficulty of on-site mobile testing equipment. It is compatible with the advantages of full-function testers and low-voltage testers, and has high practicality and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the system structure of a modular thyristor valve function test equipment with all test functions.

[0023] Figure 2 This is the back view of the basic module integrated chassis solution 1.

[0024] Figure 3 This is the back view of the basic module integrated chassis solution 2.

[0025] Figure 4 This is the rear view of chassis solution 1 with a single optional module.

[0026] Figure 5 This is the rear view of chassis solution 2 with a single optional module.

[0027] Figure 6 This is the front view of the modular thyristor valve function test equipment with full test functions.

[0028] Figure 7 This is the rear view of the modular thyristor valve function test equipment with full test functions.

[0029] Figure 8 This is a schematic diagram of the system structure of a modular thyristor valve function test equipment that only has an impedance test function.

[0030] Fig. 9 This is the front view of the modular thyristor valve function test equipment with only impedance test function.

[0031] Fig.10 This is the rear view of the modular thyristor valve functional test equipment with only impedance test function. DETAILED DESCRIPTION

[0032] The present application is further introduced and described below in conjunction with embodiments, but the protection scope of the present application is not limited thereto.

[0033] Embodiment 1

[0034] The test equipment provided in this example has all the test functions. Its system block diagram is as follows: Figure 1As shown, it is mainly composed of a basic module 1 and an optional module 2. Among them, the basic module 1 includes a human-machine interface module 3, a main control module 4, a sampling module 5 and an export control module 6, and the optional module 2 includes an impedance power supply module 7, a low-voltage power supply module 8 and a high-voltage power supply module 9. There are three main types of signals transmitted between the modules: sampling signals, control signals and test voltage signals. The sampling module 5 collects the electrical signals of the impedance power supply module 7, the low-voltage power supply module 8 and the high-voltage power supply module 9 and sends them to the main control module 4. The main control module 4 generates control signals for the impedance power supply module 7, the low-voltage power supply module 8 and the high-voltage power supply module 9 according to the above-mentioned sampling signals, so that they generate the specified test voltage signals respectively. The test voltage signals generated by the impedance power supply module 7, the low-voltage power supply module 8 and the high-voltage power supply module 9 are transmitted to the export control module 6. The main control module 4 also outputs a control signal to the export control module 6, and the export control module 6 selects one or more superimposed signals from the test voltage signals of the impedance power supply module 7, the low-voltage power supply module 8 and the high-voltage power supply module 9 according to the control signal and outputs them to the product under test.

[0035] The basic module integrated chassis 10 of the test equipment provided in this example integrates a human-machine interface module 3, a main control module 4, a sampling module 5 and an outlet control module 6. The outlet control module 6 includes at least three test voltage signal input interfaces, three switch selection loops and one test voltage signal output interface. Each test voltage signal input interface is connected in series with a switch selection loop, and multiple series loops are connected in parallel to the test voltage signal output interface. Figure 2 As shown, on the back of the chassis are control signal interfaces 11, 12, 13, sampling signal interfaces 14, 15, 16, and test voltage signal interfaces 17, 18, 19, which are respectively connected to the impedance power module 7, the low voltage power module 8, and the high voltage power module 9, as well as a power input interface 20 and a test voltage signal interface 21 output to the test product. Figure 3 As shown, the back of the independent chassis of each optional module is provided with a control signal interface 22, a sampling signal interface 23 and a test voltage signal interface 24. Each optional module contains at least one voltage generating circuit and one isolation circuit, and the voltage generating circuit is connected to the test voltage signal interface 24 of the optional module through the isolation circuit.

[0036] The main control module 3 outputs a control signal to the optional module 2 and the export control module 6 according to the test item. The optional module 2 generates a corresponding test voltage signal and outputs it to the corresponding test voltage signal input interface on the export control module 6. The switch selection circuit in the export control module 6 selects one of the test voltage input signals or the superposition of multiple test voltage input signals as the final test voltage output signal of the modular thyristor valve function test equipment according to the control signal sent by the main control module 3.

[0037] The actual test equipment provided in this example is as follows Figure 4 and Figure 5 As shown, the test equipment is composed of a basic module integrated chassis 10, an impedance power module chassis 25, a low-voltage power module chassis 26 and a high-voltage power module chassis 27, and the upper and lower chassis are connected and fixed by a support 28. The basic module integrated chassis 10 and the impedance power module chassis 25 are connected through a control signal wiring 29, a sampling signal wiring 30, and a test voltage signal wiring 31. The basic module integrated chassis 10 and the low-voltage power module chassis 26 are connected through a control signal wiring 32, a sampling signal wiring 33, and a test voltage signal wiring 34. The basic module integrated chassis 10 and the high-voltage power module chassis 27 are connected through a control signal wiring 35, a sampling signal wiring 36, and a test voltage signal wiring 37. After the test equipment is powered on, the main control module 4 in the basic module integrated chassis 10 can detect the impedance power module 7, the low-voltage power module 8 and the high-voltage power module 9 through the above-mentioned signal wiring, and enable all corresponding test functions.

[0038] The feature of this application is that the optional modules can be flexibly selected according to the on-site test requirements, and the corresponding tests can be completed after being connected through signal lines.

[0039] Embodiment 2

[0040] The test equipment provided in this example only has the impedance test function. Its system block diagram is as follows: Figure 8 As shown, it is mainly composed of a basic module 1 and an optional module 2, wherein the basic module 1 includes a human-machine interface module 3, a main control module 4, a sampling module 5 and an export control module 6, and the optional module 2 includes an impedance power supply module 7. There are three main types of signals transmitted between the modules: sampling signals, control signals and test voltage signals. The sampling module collects the electrical signals of the impedance power supply module 7 and sends them to the main control module 4. The main control module 4 generates a control signal of the impedance power supply module 7 according to the above sampling signal, so that it generates a specified test voltage signal. The test voltage signal generated by the impedance power supply module 7 is transmitted to the export control module 6. The main control module 4 also outputs a control signal to the export control module 6, and the export control module 6 outputs the test voltage signal of the impedance power supply module 7 to the product under test according to the control signal.

[0041] The basic module integrated chassis 10 of the test equipment provided in this example integrates a human-machine interface module 3, a main control module 4, a sampling module 5 and an outlet control module 6. The back view thereof is as shown in FIG. Figure 3 As shown, the back of the chassis is provided with a power input interface 20 and a test voltage signal interface 21 for outputting the test product, and the bottom of the chassis is provided with a number of male connectors 38, which have the functions of both installation and signal transmission. Figure 5 As shown, each optional module has a plurality of female connectors 39 on the top and a plurality of male connectors 38 on the bottom, and these male and female connectors have both the functions of installation and fixing and signal transmission.

[0042] The actual test equipment provided in this example is as follows Fig. 9 and Fig.10 As shown, the test equipment is composed of a basic module integrated chassis 10 and an impedance power module chassis 25. The upper and lower chassis are connected and fixed by inserting the male connector at the bottom of the chassis 10 into the female connector 39 at the top of the chassis 25 one by one. At the same time, the connection of these male and female connectors also realizes the path of sampling signals, control signals and electrical signals. After the test equipment is powered on, the main control module 4 in the basic module integrated chassis 10 can detect the impedance power module 7 in the impedance power module chassis 25 through the above-mentioned signal wiring, and only enable the corresponding impedance test function.

[0043] The feature of this application is that the optional modules can be flexibly selected according to the on-site testing requirements, and different chassis can be stacked up and fixedly connected through male and female connectors, while realizing the signal path and then completing the corresponding test.

[0044] Embodiment 3

[0045] The functional test is performed using the aforementioned test equipment. The test method comprises the following steps:

[0046] a. Move the basic module to the lifting platform;

[0047] b. Move one or more of the optional modules to the lifting platform according to the required test functions;

[0048] c. Connect the basic module and the optional module on the lifting platform through the interface as described above to form a complete test device;

[0049] d. Start the test;

[0050] e. After the test, release the connection described in step c on the lifting platform;

[0051] f. Move each module from the lifting platform to the ground;

[0052] g. End of test.

[0053] The test after outputting the test voltage signal to the product under test is well known in the art and will not be described in detail here. Only the generation of the test voltage output signal will be described below.

[0054] The main control module 3 outputs a control signal to the optional module 2 and the export control module 6 according to the test item. The optional module 2 generates a corresponding test voltage signal and outputs it to the corresponding test voltage signal input interface on the export control module 6. The switch selection circuit in the export control module 6 selects one of the test voltage input signals or the superposition of multiple test voltage input signals as the final test voltage output signal of the modular thyristor valve function test equipment according to the control signal sent by the main control module 3.

[0055] Those skilled in the art may make variations and modifications within the scope of the claims of the present application, and as long as they do not exceed the scope of the claims, they are within the protection scope of the present application.

Claims

1. A thyristor valve function test device, characterized in that: The test equipment includes a basic module and an optional module, and is assembled from all the modules in the basic module and any one or more modules in the optional module through interfaces on the modules. The test equipment is configured to detect the optional modules contained in the test equipment through a power-on self-test, and to enable and disable test functions corresponding to the optional modules. The optional modules include an impedance power supply module, a low-voltage power supply module and a high-voltage power supply module, and the test functions include impedance testing, low-voltage testing and high-voltage testing. All modules of the basic module are integrated in a chassis, and each module in the optional module adopts an independent chassis, so that one or more of the optional modules can be selected according to on-site testing requirements, and the chassis of the basic module and the chassis of the selected optional module are stacked up and fixedly connected through male and female connectors to realize a signal path and complete corresponding tests.

2. The test device according to claim 1, characterized in that The basic module includes a human-machine interface module, a sampling module, a main control module and an outlet control module.

3. The testing device according to claim 1, characterized in that The chassis of the basic module is provided with lifting ears, handles or rollers for movement, and the chassis contains one or more sampling signal interfaces, control signal interfaces and test voltage signal interfaces.

4. The testing device according to claim 1, characterized in that The chassis of the optional module are all provided with lifting ears, handles or rollers for movement, and the chassis contains one or more sampling signal interfaces, control signal interfaces and test voltage signal interfaces.

5. The testing device according to claim 1, characterized in that Each of the optional modules includes at least one voltage generating circuit and one isolation circuit, and the voltage generating circuit is connected to the test voltage signal interface of the module through the isolation circuit.

6. The testing device according to claim 2, characterized in that: The outlet control module comprises at least three test voltage signal input interfaces, three switch selection circuits and one test voltage signal output interface, each of the test voltage signal input interfaces is respectively connected in series with a switch selection circuit, and multiple series circuits are connected in parallel to the test voltage signal output interface.

7. The testing device according to claim 6, characterized in that The main control module is configured to output a control signal to the optional module and the outlet control module according to the test item, the optional module generates a corresponding test voltage signal and outputs it to the corresponding test voltage signal input interface on the outlet control module, and the switch selection circuit in the outlet control module selects one of the test voltage input signals or the superposition of multiple test voltage input signals as the test voltage output signal of the test equipment according to the control signal sent by the main control module.

8. A method for performing a functional test using a thyristor valve functional test device, characterized in that: For use in a thyristor valve function test device as claimed in any one of claims 2, 6 or 7, the method comprises the following steps: a. Move the basic module to the lifting platform; b. Move one or more optional modules to the lifting platform according to the required test functions; c. Connect the basic module and the optional module through corresponding interfaces on the lifting platform to form a complete test device, wherein: the basic module and the optional module can be connected and assembled into a whole to meet the requirements of thyristor-level functional testing; d. Start the test; e. After the test, release the connection described in step c on the lifting platform; f. Move each module from the lifting platform to the ground.

9. The method according to claim 8, characterized in that The main control module in the basic module is configured to output a control signal to the optional module and the outlet control module in the basic module according to the test item, the optional module generates a corresponding test voltage signal and outputs it to the corresponding test voltage signal input interface on the outlet control module, and the switch selection circuit in the outlet control module selects one of the test voltage input signals or the superposition of multiple test voltage input signals as the test voltage output signal of the test equipment according to the control signal sent by the main control module.

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