CN110596580B - Flexible-straight converter valve overvoltage bypass test method and device - Google Patents
Flexible-straight converter valve overvoltage bypass test method and device Download PDFInfo
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Abstract
The invention relates to a method and a device for testing an overpressure bypass of a flexible straight converter valve, wherein the method comprises the steps of firstly determining submodules to be tested in a first valve assembly and a second valve assembly; charging the first auxiliary valve, the second auxiliary valve, the first test sample valve and the second test sample valve by using the charging branch; secondly, performing boosting bypass operation on the sub-module to be tested in the test valve by controlling the two test valve and the two auxiliary valves so as to trigger the sub-module overvoltage protection logic after the voltage of the sub-module to be tested rises to an overvoltage protection fixed value, and controlling the sub-module to be tested to bypass so that the voltage of the sub-module to be tested gradually drops; and when the system current rises rapidly, the overcurrent protection logic is triggered to control all the submodules to be locked, so that the current gradually drops. By the method, the stress characteristics of the key parts of the sub-module under fault overvoltage and overcurrent and the correctness of the protection logic of the sub-module are detected.
Description
Technical Field
The invention belongs to the technical field of flexible power transmission and distribution, and particularly relates to a flexible direct current converter valve overvoltage bypass test method and device.
Background
With the development of fully-controlled power electronic devices and the application of power electronic technology in power systems, Voltage-source Converter High Voltage Direct Current (VSC-HVDC) technology based on Voltage source converters is increasingly gaining attention. A Modular Multilevel Converter (MMC) is one of voltage source converters in application of a flexible direct current transmission system, and is widely applied to flexible direct current transmission and a new energy access system with its remarkable advantages.
Each converter bridge arm in the MMC direct current transmission project comprises a plurality of sub-modules, and each sub-module comprises a capacitor and a switch device. When the system normally operates, key parts of the sub-modules bear electrical stress within the allowable range of the parts; when the system breaks down, the key parts of the sub-modules bear large electrical stress, and even damage the parts, so that the sub-modules are damaged to endanger the safety of the system. Therefore, when the submodule is designed, overvoltage protection measures, namely overvoltage software and hardware protection of submodule capacitor voltage, must be configured on the submodule to ensure that the electrical stress of key parts of the submodule is within a bearable range and the parts are not damaged under the condition of system failure or submodule failure.
When the bipolar flexible direct current power transmission system has a single-phase earth fault in a station, the protection control acts immediately to lock the current converter. However, due to the follow current characteristic of the anti-parallel diode of the device, the alternating current generates direct current bias and continuously charges the bridge arm sub-module, so that the alternating current circuit breaker cannot be normally disconnected, the converter valve sub-module is seriously overvoltage, even the whole overvoltage bypass of the bridge arm of the converter valve is damaged, and the safe and stable operation of the system is damaged.
Disclosure of Invention
The invention provides a flexible direct converter valve overvoltage bypass test method and device, which are used for meeting the requirements of detection of converter valve electrical stress and submodule overvoltage protection logic tests.
In order to solve the technical problems, the technical scheme and the beneficial effects of the invention are as follows:
the invention discloses an overvoltage bypass test method for a flexible straight converter valve, which is used for a test system with the following structure: the system comprises a first test branch, a second test branch and a charging branch which are connected in parallel; a first auxiliary valve and a first interface used for connecting a first test sample valve are arranged in the first test branch in series; a second auxiliary valve and a second interface used for connecting a second test sample valve are arranged in the second test branch in series; the first test sample valve and the second test sample valve respectively comprise a plurality of sub-modules which are connected in series;
the steps of the overpressure bypass test are as follows:
1) determining submodules to be tested in the first valve assembly and the second valve assembly;
2) charging the first auxiliary valve, the second auxiliary valve, the first test sample valve and the second test sample valve by using the charging branch;
3) for the first sample valve, the submodule to be tested is controlled to be locked, part of the submodule is controlled to be put into, and the first auxiliary valve is controlled to be put into; for the second sample valve, the submodule to be tested is controlled to be locked, a part of submodules is controlled to be cut off, and the second auxiliary valve is controlled to be cut off; charging the submodule to be tested through the submodule in the input state;
4) and after the voltage of the sub-module to be tested rises to the overvoltage protection fixed value, controlling the sub-module to be tested to bypass, so that the voltage of the sub-module to be tested gradually drops.
The invention discloses an overvoltage bypass test device for a flexible direct current converter valve, which comprises a memory and a processor, and aims at a test system with the following structure: the system comprises a first test branch, a second test branch and a charging branch which are connected in parallel, wherein a first auxiliary valve and a first interface used for connecting a first test valve are arranged in the first test branch in series, a second auxiliary valve and a second interface used for connecting a second test valve are arranged in the second test branch in series, the first test valve and the second test valve respectively comprise a plurality of sub-modules which are connected in series, and a processor is used for executing instructions stored in a memory to realize the following method steps:
1) determining submodules to be tested in the first valve assembly and the second valve assembly;
2) charging the first auxiliary valve, the second auxiliary valve, the first test sample valve and the second test sample valve by using the charging branch;
3) for the first sample valve, the submodule to be tested is controlled to be locked, part of the submodule is controlled to be put into, and the first auxiliary valve is controlled to be put into; for the second sample valve, the submodule to be tested is controlled to be locked, a part of submodules is controlled to be cut off, and the second auxiliary valve is controlled to be cut off; charging the submodule to be tested through the submodule in the input state;
4) and after the voltage of the sub-module to be tested rises to the overvoltage protection fixed value, controlling the sub-module to be tested to bypass, so that the voltage of the sub-module to be tested gradually drops.
The beneficial effects are as follows: according to the method, the sub-module to be tested in the test valve is subjected to boosting bypass operation by controlling the two test valve bodies and the two auxiliary valve bodies, so that the stress characteristics of key components of the sub-module under fault overvoltage and overcurrent conditions are detected, and a basis is provided for verifying the rationality of the overvoltage protection configuration of the sub-module.
As a further improvement of the method and the device, after the step 2), the method further comprises the following steps: and adjusting the amplitude and the phase difference of the voltage output from two ends of the first sample valve and the second sample valve, so that the first valve assembly and the second valve assembly continuously operate at the maximum current.
As a further improvement of the method and the device, in step 4), when the voltage of the sub-module to be tested is gradually decreased, the method further comprises the following steps: and checking the system current, and controlling the first auxiliary valve, the second auxiliary valve, the first test sample valve and the second test sample valve to be locked after the system current reaches a current protection fixed value, so that the system current gradually decreases.
As a further improvement of the method and the device, the method further comprises the following steps: and carrying out off-line inspection on each sub-module in the first test sample valve and the second test sample valve.
Drawings
FIG. 1 is a diagram of a test system in an embodiment of the method of the present invention;
FIG. 2 is a diagram of a system fault current waveform in an embodiment of the method of the present invention;
FIG. 3 is a graph of valve assembly submodule capacitance voltage waveforms in an embodiment of the method of the present invention;
FIG. 4 is a graphical representation of electrical stress waveforms of key components in sub-modules of the valve assembly 4 in an embodiment of the method of the present invention;
fig. 5 is a voltage-current stress waveform diagram of a sub-module of valve assembly 4 during overvoltage downtube conduction in accordance with an embodiment of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
The method comprises the following steps:
the embodiment provides an overpressure bypass test method for a flexible direct current converter valve, and the method is used for carrying out an overpressure bypass test on a test system shown in figure 1.
As shown in fig. 1, the testing system includes a first testing branch, a second testing branch and a charging branch connected in parallel. A first test sample valve and a reactor L1 are arranged on the first test branch in series, and a first interface for connecting the first test sample valve is arranged on the first test branch; a second test sample valve is arranged on the second test branch in series, and a second interface for connecting the second test sample valve is arranged on the second test branch; the charging branch is provided with a resistor R1 and a switch S1 in series.
The method comprises the following steps that a proper valve component number is selected for testing according to rated operation voltage of a submodule, a voltage overvoltage value of a submodule capacitor and insulation requirements of a test system in a factory, a first test sample valve comprises two valve components which are respectively a valve component 1 and a valve component 2, and a second test sample valve comprises two valve components which are respectively a valve component 3 and a valve component 4. Each valve component is composed of a plurality of sub-modules connected in series, each sub-module can be a half-bridge sub-module, a full-bridge sub-module, a clamping sub-module or a combination of the sub-modules, and a power switch tube device in each sub-module can be an IGBT (insulated gate bipolar transistor) device or a MOSFET (metal-oxide-semiconductor field effect transistor) device. Moreover, the sub-module parameters are consistent with the parameter settings of the engineering sub-module. In this embodiment, the submodules are all half-bridge submodules.
The system belongs to the prior art and is disclosed in the Chinese invention patent with the application publication number of CN 103197241A.
When the overpressure and overcurrent characteristics of the converter valve need to be tested, the valve component 1 and the valve component 2 which are arranged in series are connected into a first test branch through a first interface, the valve component 3 and the valve component 4 which are arranged in series are connected into a second test branch through a second interface, and then the test is carried out.
For the half-bridge submodule, the states of the upper tube and the lower tube which are turned on and turned off are defined as that the submodule is in an input state, the states of the upper tube and the lower tube which are turned on are defined as that the submodule is in a cutting state, and the states of the upper tube and the lower tube which are turned off are defined as that the submodule is in a locking state. Moreover, each submodule is provided with overvoltage protection logic, namely when the submodule capacitor voltage Uc reaches an overvoltage protection constant value of 3200V, a bypass submodule is controlled, namely a lower tube of the submodule is switched on, an upper tube of the submodule is switched off, and a bypass switch is switched on; and the test system is also provided with overcurrent protection logic, namely all valve assemblies and auxiliary valves are locked when the current Iarm reaches an overcurrent protection constant value 5900A, and the power supply 1 and the power supply 2 are disconnected by an alternating current circuit breaker. It should be noted that, when the overvoltage protection logic is bypassed, the control commands for the upper tube, the lower tube and the bypass switch are issued simultaneously, but since the upper tube and the lower tube are turned off at a relatively high speed, the fast bypass sub-module is realized by the way of turning on the lower tube and turning off the upper tube, and the bypass switch has high reliability, and after the bypass switch is turned on, the reliable bypass of the sub-module can be realized.
The specific test steps are as follows:
1. the sub-modules of the valve assembly 1, the valve assembly 2, the valve assembly 3 and the valve assembly 4 which need to be tested are selected, for example, the sub-modules of the valve assembly 4 are selected as the sub-modules to be tested.
2. The valve assembly 1, the valve assembly 2, the valve assembly 3, the valve assembly 4, the first auxiliary valve and the second auxiliary valve are charged by the charging branch, and after the charging is completed, the opening switch S1 is controlled to open the charging branch.
3. And setting two groups of modulation wave amplitude values and phase remote modulation parameter values of the first test sample valve and the second test sample valve by the background, and obtaining alternating current and direct current components required by the operation of the converter valve by adjusting the amplitude value and the phase difference of the two test sample valves so as to ensure that the maximum current of the converter valve continuously operates.
4. The background control valve assembly 1, the valve assembly 2 and the first auxiliary valve are all in an input state (that is, upper pipes of all sub-modules in the valve assembly 1, the valve assembly 2 and the first auxiliary valve are all opened and lower pipes thereof are all closed), the control valve assembly 3 and the second auxiliary valve are all in a cut-off state (that is, upper pipes of all sub-modules in the valve assembly 3 and the second auxiliary valve are all closed and lower pipes thereof are all opened), and the control valve assembly 4 is in a locking state (that is, upper pipes and lower pipes of all sub-modules in the valve assembly 4 are all closed), so that the state that capacitors corresponding to all sub-modules in the valve assembly 1, the valve assembly 2 and the first auxiliary valve are connected in series and the capacitors of all sub-modules in the valve assembly 4 are charged is formed, and the capacitors of the valve assembly 3 and the second auxiliary valve are naturally discharged due to the cut-off state.
5. The capacitor voltage of all the sub-modules in the valve assembly 4 rises rapidly to reach the overvoltage protection constant value of 3200V, and the simulation results are shown in fig. 3, 4 and 5. At this time, the overvoltage protection logic of the sub-module is enabled to control the bypass sub-module, that is, the lower tube of the sub-module in the control valve assembly 4 is switched on, the upper tube is switched off, and the bypass switch is switched on, so that the sub-module capacitor voltage gradually decreases. And at the time of lower tube conduction, the current stress is 3300A, which is consistent with the current stress at the time of system failure in engineering.
6. Due to the discharge of the capacitors of the valve assembly 1, the valve assembly 2 and the sub-modules in the first auxiliary valve, the system current (i.e., the current passing through the reactor L1) rises rapidly, and when the system current rises to the over-current protection constant value 5900A, the simulation result is as shown in fig. 2, and the maximum system current is 6500A and is consistent with the system fault current stress in the engineering. And controlling all the sub-modules to be locked (namely, the upper pipes and the lower pipes of all the sub-modules in the valve component 1, the valve component 2, the valve component 3, the valve component 4, the first auxiliary valve and the second auxiliary valve are all turned off), disconnecting the power supply 1 and the power supply 2, and gradually reducing the current.
7. After the capacitor voltage of all the sub-modules is discharged, whether the key parts of all the sub-modules in the valve assembly 4 are damaged or not can be checked off line.
In addition, in the embodiment, a submodule in the valve assembly 4 is set as a submodule to be tested, and the submodule in the valve assembly 4 is subjected to boosting operation through the submodule in the valve assembly 1 and the submodule in the valve assembly 2 so as to detect characteristics under fault overpressure and overcurrent stress of the submodule in the valve assembly 4. As other embodiments, for example, the sub-modules in the valve assembly 4 may be subjected to a boosting operation by the sub-modules in the valve assembly 1 and the valve assembly 3 by controlling key components of the respective sub-modules; partial sub-modules in the valve assemblies 1, 2 and 3 can also perform boosting operation on the sub-modules in the valve assembly 4 by controlling key components of the sub-modules; as long as partial submodules in the test system are charged for the submodules to be tested, the boosting of the submodules to be tested can reach the overvoltage protection fixed value.
The embodiment of the device is as follows:
the embodiment provides a flexible direct current converter valve overvoltage bypass testing device which comprises a memory and a processor, wherein the memory and the processor are directly or indirectly electrically connected to achieve data transmission or interaction, and the processor is used for executing instructions stored in the memory to test a testing system disclosed in the method embodiment and shown in fig. 1 to achieve the overvoltage bypass testing method disclosed in the method embodiment. As the description of the method is sufficiently clear it will not be described in detail here.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (8)
1. The overvoltage bypass test method of the flexible straight converter valve is characterized by being used for a test system with the following structure: the system comprises a first test branch, a second test branch and a charging branch which are connected in parallel; a first auxiliary valve and a first interface used for connecting a first test sample valve are arranged in the first test branch in series; a second auxiliary valve and a second interface used for connecting a second test sample valve are arranged in the second test branch in series; the first sample valve comprises two valve components which are a first valve component and a second valve component respectively, the second sample valve comprises two valve components which are a third valve component and a fourth valve component respectively, and each valve component comprises a plurality of serially connected sub-modules;
the steps of the overpressure bypass test are as follows:
1) determining submodules to be tested in each valve assembly;
2) charging the first auxiliary valve, the second auxiliary valve, the first test sample valve and the second test sample valve by using the charging branch;
3) for the first sample valve, the submodule to be tested is controlled to be locked, part of the submodule is controlled to be put into, and the first auxiliary valve is controlled to be put into; for the second sample valve, the submodule to be tested is controlled to be locked, a part of submodules is controlled to be cut off, and the second auxiliary valve is controlled to be cut off; charging the submodule to be tested through the submodule in the input state;
4) and after the voltage of the sub-module to be tested rises to the overvoltage protection fixed value, controlling the sub-module to be tested to bypass, so that the voltage of the sub-module to be tested gradually drops.
2. The flexible direct converter valve overvoltage bypass test method according to claim 1, characterized by further comprising, after the step 2): and adjusting the amplitude and the phase difference of the voltage output from two ends of the first sample valve and the second sample valve, so that the first valve assembly and the second valve assembly continuously operate at the maximum current.
3. The flexible direct current converter valve overvoltage bypass test method according to claim 1, wherein in the step 4), when the voltage of the sub-module to be tested is gradually reduced, the method further comprises the following steps: and checking the system current, and controlling the first auxiliary valve, the second auxiliary valve, the first test sample valve and the second test sample valve to be locked after the system current reaches a current protection fixed value, so that the system current gradually decreases.
4. The method for testing the overpressure bypass of the flexible straight converter valve according to any one of claims 1 to 3, further comprising, after the step 4): and carrying out off-line inspection on each sub-module in the first test sample valve and the second test sample valve.
5. The overvoltage bypass testing device for the flexible direct current converter valve is characterized by comprising a memory and a processor, and is aimed at a testing system with the following structure: the system comprises a first test branch, a second test branch and a charging branch which are connected in parallel, wherein a first auxiliary valve and a first interface used for connecting a first test valve are arranged in the first test branch in series, a second auxiliary valve and a second interface used for connecting a second test valve are arranged in the second test branch in series, the first test valve comprises two valve components which are respectively a first valve component and a second valve component, the second test valve comprises two valve components which are respectively a third valve component and a fourth valve component, each valve component comprises a plurality of sub-modules connected in series, and a processor is used for executing instructions stored in a memory to realize the following method steps:
1) determining submodules to be tested in each valve assembly;
2) charging the first auxiliary valve, the second auxiliary valve, the first test sample valve and the second test sample valve by using the charging branch;
3) for the first sample valve, the submodule to be tested is controlled to be locked, part of the submodule is controlled to be put into, and the first auxiliary valve is controlled to be put into; for the second sample valve, the submodule to be tested is controlled to be locked, a part of submodules is controlled to be cut off, and the second auxiliary valve is controlled to be cut off; charging the submodule to be tested through the submodule in the input state;
4) and after the voltage of the sub-module to be tested rises to the overvoltage protection fixed value, controlling the sub-module to be tested to bypass, so that the voltage of the sub-module to be tested gradually drops.
6. The flexible straight converter valve overvoltage bypass test device according to claim 5, further comprising after the step 2): and adjusting the amplitude and the phase difference of the voltage output from two ends of the first sample valve and the second sample valve, so that the first valve assembly and the second valve assembly continuously operate at the maximum current.
7. The flexible direct current converter valve overvoltage bypass test device according to claim 5, wherein in the step 4), when the voltage of the sub-module to be tested is gradually reduced, the device further comprises: and checking the system current, and controlling the first auxiliary valve, the second auxiliary valve, the first test sample valve and the second test sample valve to be locked after the system current reaches a current protection fixed value, so that the system current gradually decreases.
8. The overvoltage bypass testing device for the flexible straight converter valve according to any one of claims 5 to 7, characterized by further comprising, after the step 4): and carrying out off-line inspection on each sub-module in the first test sample valve and the second test sample valve.
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| CN113376453A (en) * | 2020-02-25 | 2021-09-10 | 南京南瑞继保电气有限公司 | Voltage source converter submodule fault protection test method |
| CN112098796B (en) * | 2020-08-14 | 2022-12-06 | 中国南方电网有限责任公司超高压输电公司 | Flexible direct current converter valve half-bridge submodule thyristor breakdown testing device and method |
| CN113866541B (en) * | 2021-09-26 | 2023-08-08 | 广东电网有限责任公司广州供电局 | Overvoltage protection test method, device and equipment for direct current converter valve power module |
| CN114089156B (en) * | 2021-10-29 | 2023-11-03 | 广东电网有限责任公司广州供电局 | Method and device for testing effectiveness of overvoltage protection function of power module hardware |
| CN114167278B (en) * | 2022-02-11 | 2022-05-17 | 华北电力科学研究院有限责任公司 | Flexible direct-current transmission voltage source converter valve test method and power supply device |
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| CN108279378A (en) * | 2017-12-29 | 2018-07-13 | 中电普瑞电力工程有限公司 | A kind of steady state test device and method of modular multilevel converter valve |
| CN112448572A (en) * | 2019-08-28 | 2021-03-05 | 西安许继电力电子技术有限公司 | Charging method and charging control device for short circuit of direct current side of hybrid converter |
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