CN111398772A - Circuit, method and device for converter valve overcurrent turn-off test - Google Patents
Circuit, method and device for converter valve overcurrent turn-off test Download PDFInfo
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- CN111398772A CN111398772A CN202010290234.XA CN202010290234A CN111398772A CN 111398772 A CN111398772 A CN 111398772A CN 202010290234 A CN202010290234 A CN 202010290234A CN 111398772 A CN111398772 A CN 111398772A
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- 238000012360 testing method Methods 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 40
- 238000007781 pre-processing Methods 0.000 claims description 13
- 238000002955 isolation Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2608—Circuits therefor for testing bipolar transistors
- G01R31/2617—Circuits therefor for testing bipolar transistors for measuring switching properties thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2608—Circuits therefor for testing bipolar transistors
- G01R31/2619—Circuits therefor for testing bipolar transistors for measuring thermal properties thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/27—Testing of devices without physical removal from the circuit of which they form part, e.g. compensating for effects surrounding elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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Abstract
The invention discloses a circuit, a method and a device for an overcurrent turn-off test of a converter valve, wherein the test circuit comprises a direct-current power supply, an isolating switch, a filter reactor and at least two phase units; the phase unit comprises at least two converter valves, a bridge arm reactor and a load reactor, wherein the converter valves are connected through the bridge arm reactor; the alternating current sides of the at least two phase units are connected through the load reactor; the direct current sides of the at least two phase units are connected; and the direct current power supply is connected with the direct current side of the phase unit through the isolating switch and the filter reactor. The maximum continuous operation test of the converter valve and the overcurrent turn-off test of the transistor can be simultaneously carried out in a circuit, so that the utilization rate of equipment is improved, and the investment cost is reduced; meanwhile, the test circuit runs stably and reliably, and the technical requirements of the converter valve overcurrent turn-off test are met.
Description
Technical Field
The invention relates to the field of testing of a flexible direct-current power transmission converter valve, in particular to a circuit, a method and a device for an overcurrent turn-off test of a converter valve.
Background
A flexible high Voltage direct current transmission technology (VSC-HVDC) Based on a Modular Multilevel Converter (MMC) is increasingly widely applied to power systems, and the Voltage level and the current level of the flexible high Voltage direct current transmission technology are increasingly higher and higher. To ensure the reliability of the MMC valve, which is a key device, engineering has put higher demands on its electrical performance, especially on its ability to withstand various extreme currents, voltages and thermal stresses in a fault state. Therefore, before engineering commissioning, a series of tests must be performed on the MMC valve according to standards to verify that the design of the MMC valve meets engineering requirements.
An over-current working condition of an Insulated Gate Bipolar Transistor (IGBT) mainly occurs in a period from the initial fault moment of a flexible direct-current power grid to the time before a related protection action, the IGBT of the MMC valve bears a discharging inrush current with high amplitude in the period, and the IGBT can reliably turn off the fault current. To assess this performance of the MMC valve, it needs to be subjected to an IGBT overcurrent shutdown test. In order to be consistent with the actual working condition as much as possible, the highest junction temperature of the MMC valve IGBT under the normal operation condition is ensured before the test is carried out.
At present, the following problems mainly exist in the patents on the MMC valve IGBT overcurrent turn-off test at home and abroad: firstly, an MMC valve is adopted to discharge a load to generate IGBT overcurrent, and although the method can generate specified overcurrent, the method cannot meet the requirement of the test under the condition that the IGBT reaches steady junction temperature; and secondly, a discharge circuit is additionally added on the basis of the MMC valve operation test to carry out an IGBT overcurrent test, the problem of IGBT heating is solved by the method, equipment needs to be additionally added on the basis of the original circuit, and the circuit complexity and the investment cost are improved.
Disclosure of Invention
The invention aims to provide a circuit, a method and a device for an overcurrent turn-off test of a converter valve, wherein the maximum continuous operation test of the converter valve and the overcurrent turn-off test of a transistor can be simultaneously carried out in the circuit, so that the utilization rate of equipment is improved, and the investment cost is reduced; meanwhile, the converter valve can be heated under the maximum continuous operation working condition, the junction temperature equivalence of the transistor is good and is closer to the actual operation working condition of the converter valve, the performance of the converter valve is favorably checked, and meanwhile, the test circuit is stable and reliable in operation and meets the technical requirements of the overcurrent turn-off test of the converter valve.
To solve the above problems, an aspect of the present invention provides a circuit for an overcurrent shutdown test of a converter valve, the circuit comprising: the device comprises a direct-current power supply, an isolating switch, a filter reactor and at least two phase units.
The phase unit comprises at least two converter valves, a bridge arm reactor and a load reactor, wherein the converter valves are connected through the bridge arm reactor; the alternating current sides of the at least two phase units are connected through the load reactor; the direct current sides of the at least two phase units are connected.
And the direct current power supply is connected with the direct current side of the phase unit through the isolating switch and the filter reactor.
According to one embodiment of the invention, the isolation switch comprises a first isolation switch and a second isolation switch; the filter reactor comprises a first filter reactor and a second filter reactor;
the direct current power supply is connected with one end of the direct current side of the phase unit through the first isolating switch and the first filter reactor, and is connected with the other end of the direct current side of the phase unit through the second isolating switch and the second filter reactor.
According to one embodiment of the present invention, the two phase units include a first arm unit, a second arm unit, a third arm unit, a fourth arm unit, and a load reactor, and the first arm unit, the second arm unit, the third arm unit, the fourth arm unit, and the load reactor are connected in a bridge manner.
According to one embodiment of the invention, the first bridge arm unit comprises a first converter valve submodule and a first bridge arm reactor, wherein the positive electrode of the first converter valve submodule is connected with one end of the first filter reactor, and the negative electrode of the first converter valve submodule is connected with one end of the first bridge arm reactor; the second bridge arm unit comprises a second converter valve submodule and a second bridge arm reactor, the positive electrode of the second converter valve submodule is connected with one end of the first filter reactor, and the negative electrode of the second converter valve submodule is connected with one end of the second bridge arm reactor; the third bridge arm unit comprises a third converter valve submodule and a third bridge arm reactor, the anode of the third converter valve submodule is connected with one end of the third bridge arm reactor, and the cathode of the third converter valve submodule is connected with one end of the second filter reactor; the fourth bridge arm unit comprises a fourth converter valve submodule and a fourth bridge arm reactor, the positive electrode of the fourth converter valve submodule is connected with one end of the fourth bridge arm reactor, and the negative electrode of the fourth converter valve submodule is connected with one end of the second filter reactor;
the other end of the first bridge arm reactor and the other end of the third bridge arm reactor are connected with one end of the load reactor, and the other end of the second bridge arm reactor and the other end of the fourth bridge arm reactor are connected with the other end of the load reactor.
According to an embodiment of the invention, each converter valve sub-module comprises a plurality of full-bridge sub-module circuits or a plurality of half-bridge sub-module circuits; the number of full-bridge sub-module circuits or the number of half-bridge sub-module circuits of each converter valve sub-module is not less than 5.
According to one embodiment of the invention, the full-bridge sub-module circuit comprises: the bridge arm comprises a first submodule bridge arm unit, a second submodule bridge arm unit, a capacitor, a third submodule bridge arm unit and a fourth submodule bridge arm unit; the second end of the first sub-module bridge arm unit and one end of the second sub-module bridge arm unit are mutually connected to form a first end of the full-bridge sub-module circuit; the first end of the first sub-module bridge arm unit, the first end of the third sub-module bridge arm unit and one end of the capacitor are connected with each other; the second end of the second sub-module bridge arm unit and the second end of the fourth sub-module bridge arm unit are connected with the other end of the capacitor; the second end of the third sub-module bridge arm unit and the first end of the fourth sub-module bridge arm unit are mutually connected to form the second end of the full-bridge sub-module circuit;
or, the half-bridge sub-module circuit comprises: the half-bridge sub-module circuit comprises a first sub-module bridge arm unit, a second sub-module bridge arm unit and a capacitor, wherein one end of the first sub-module bridge arm unit and one end of the second sub-module bridge arm unit are connected with each other to form a first end of the half-bridge sub-module circuit, the other end of the first sub-module bridge arm unit is connected with one end of the capacitor, and the other end of the second sub-module bridge arm unit and the other end of the capacitor are connected with each other to form a second end of the half-bridge sub;
the bridge arm unit comprises a submodule and a submodule bridge arm unit, wherein the submodule bridge arm unit comprises a transistor and a diode, a collector electrode of the transistor and an anode of the diode are connected with each other to form a first end of the submodule bridge arm unit, and an emitter electrode of the transistor and a cathode of the diode are connected with each other to form a second end of the submodule bridge arm unit.
The invention discloses a method for overcurrent turn-off test of a converter valve in a second aspect, which is used for the circuit for overcurrent turn-off test of the converter valve, and comprises the following steps:
and S1, preprocessing the required voltage of the turn-off test.
And S2, unlocking each converter valve submodule.
And S3, adjusting the amplitude and the phase of the output voltage of each converter valve submodule to enable the test current of each converter valve submodule bridge arm unit to reach the current value of the preset maximum continuous operation state.
And S4, judging whether the junction temperature of the transistor is stable, if so, locking the bridge arm units of the sub-modules of the converter valves, and simultaneously disconnecting the first isolating switch and the second isolating switch.
And S5, conducting each sub-module bridge arm unit of the first converter valve sub-module and each sub-module bridge arm unit of the second converter valve sub-module, and disconnecting each sub-module bridge arm unit of the third converter valve sub-module and each sub-module bridge arm unit of the fourth converter valve sub-module, so that the capacitor of each sub-module bridge arm unit of the first converter valve sub-module and the capacitor of each sub-module bridge arm unit of the second converter valve sub-module discharge through each bridge arm reactor to form a first test current.
And S6, returning to the step S3 to obtain a second test current, and judging the stability of each bridge arm unit of the converter valve submodule according to the first test current and the second test current to obtain a stable result of each bridge arm unit of the converter valve submodule.
According to an embodiment of the present invention, the preprocessing the shutdown test required voltage in S1 includes: and starting the direct current power supply. And closing the first isolating switch and the second isolating switch.
And the direct-current power supply charges the terminal voltage of each converter valve submodule until the terminal voltage of each converter valve submodule reaches the rated working voltage.
The third aspect of the invention discloses a device for an overcurrent turn-off test of a converter valve, which is applied to the circuit for the overcurrent turn-off test of the converter valve, and comprises the following components:
and the preprocessing module is used for preprocessing the voltage required by the turn-off test.
And the unlocking module is used for unlocking each converter valve submodule. The first adjusting module is used for adjusting the amplitude and the phase of the output voltage of each converter valve submodule, so that the test current of each converter valve submodule bridge arm unit reaches a preset test required current value.
And the locking module is used for judging whether the junction temperature of the transistor is stable or not, locking the bridge arm units of the sub-modules of the converter valves if the junction temperature of the transistor is stable, and disconnecting the first isolating switch and the second isolating switch.
And the processing module is used for conducting each sub-module bridge arm unit of the first converter valve sub-module and each sub-module bridge arm unit of the second converter valve sub-module and disconnecting each sub-module bridge arm unit of the third converter valve sub-module and each sub-module bridge arm unit of the fourth converter valve sub-module, so that the capacitor of each sub-module bridge arm unit of the first sub-module and the capacitor of each sub-module bridge arm unit of the second converter valve sub-module are discharged through each bridge arm reactor to form a first test current.
And the second adjusting module is used for obtaining a second test current according to the first adjusting module, the locking module and the processing module, judging the stability of each sub-module bridge arm unit according to the first test current and the second test current, and obtaining a stable result of each sub-module bridge arm unit.
According to a specific embodiment, the preprocessing module comprises:
the first action unit is used for starting the direct current power supply.
And the second action unit is used for closing the first isolating switch and the second isolating switch.
And the judging unit is used for judging whether the terminal voltage of each submodule charged by the direct-current power supply to each submodule reaches a rated working voltage value or not.
The technical scheme of the invention has the following beneficial technical effects: firstly, each submodule works at the maximum continuous operation load to heat, and the actual operation condition of each submodule is close to, so that the equivalence is high; secondly, the test circuit can complete the transistor overcurrent turn-off test without additionally adding equipment; and thirdly, the transistor overcurrent turn-off tests of the bridge arm units of the plurality of sub-modules can be carried out at a time, and the test efficiency is submitted.
Drawings
FIG. 1 is a schematic circuit diagram of an embodiment of the invention for an overcurrent shutdown test of a converter valve;
FIG. 2(a) is a schematic view of the sub-module structure;
FIG. 2(b) is a schematic diagram of the half-bridge sub-module circuit;
FIG. 2(c) is a schematic circuit diagram of the full bridge sub-module;
FIG. 3 is a flow chart of the method for converter valve over-current shutdown testing;
fig. 4 is a voltage-current waveform diagram of a test valve successfully completing an IGBT overcurrent shutdown test.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described below in detail with reference to the accompanying drawings, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an MMC valve IGBT overcurrent turn-off test circuit, as shown in FIG. 1, the MMC valve overcurrent turn-off test circuit comprises a direct-current power supply, isolating switches (K11 and K12), filter reactors (L11 and L12), test sample valves (valve 1, valve 2, valve 3 and valve 4, wherein the valve 1, valve 2, valve 3 and valve 4 can respectively correspond to a first bridge arm unit, a second bridge arm unit, a third bridge arm unit and a fourth bridge arm unit), bridge arm reactors (L1, L2, L3 and L4 can respectively correspond to a first bridge arm reactor, a second bridge arm reactor, a third bridge arm reactor and a fourth bridge arm reactor) and a load reactor (L0). The power supply can be a direct-current voltage power supply and can charge the test sample valves, and the MMC valve overcurrent turn-off test circuit is very close to an actual operation circuit by adopting a 4-arm topological structure, and has small investment.
The test valve is formed by connecting n full-bridge or half-bridge submodules in series, the valve 1 and the valve 3 are connected through bridge arm reactors L1 and L3 to form a phase unit, the valve 2 and the valve 4 are connected through bridge arm reactors L2 and L4 to form another phase unit, the direct current sides of the two phase units are connected and then connected with a power supply in parallel, and the alternating current sides of the two phase units are connected through a load reactor L0.
Through the MMC valve IGBT overcurrent turn-off test circuit, the two phase units respectively work in a rectification mode and an inversion mode, the temperature is close to the actual working condition, the IGBT junction temperature can be heated to the actual working condition, and the temperature equivalence is high; through the flexible selection of the test object, the test overcurrent is generated in the designated IGBT, and the test operation is simple.
In an alternative embodiment, the sub-module circuit principle is as shown in fig. 2 (a). As shown in fig. 2(b), the half-bridge sub-module circuit includes: the half-bridge sub-module circuit comprises a first sub-module bridge arm unit, a second sub-module bridge arm unit and a capacitor, wherein one end of the first sub-module bridge arm unit and one end of the second sub-module bridge arm unit are connected with each other to form a first end of the half-bridge sub-module circuit, the other end of the first sub-module bridge arm unit is connected with one end of the capacitor, and the other end of the second sub-module bridge arm unit and the other end of the capacitor are connected with each other to form a second end of the half-bridge sub.
The submodule bridge arm units respectively comprise a transistor and a diode, a collector electrode of the transistor and an anode of the diode are connected with each other to form a first end of the submodule bridge arm unit, and an emitter electrode of the transistor and a cathode of the diode are connected with each other to form a second end of the submodule bridge arm unit.
As shown in fig. 2(c), the full-bridge sub-module circuit includes: the bridge arm comprises a first submodule bridge arm unit, a second submodule bridge arm unit, a capacitor, a third submodule bridge arm unit and a fourth submodule bridge arm unit; the second end of the first sub-module bridge arm unit and one end of the second sub-module bridge arm unit are mutually connected to form a first end of the full-bridge sub-module circuit; the first end of the first sub-module bridge arm unit, the first end of the third sub-module bridge arm unit and one end of the capacitor are connected with each other; the second end of the second sub-module bridge arm unit and the second end of the fourth sub-module bridge arm unit are connected with the other end of the capacitor; and the second end of the third sub-module bridge arm unit and the first end of the fourth sub-module bridge arm unit are mutually connected to form the second end of the full-bridge sub-module circuit.
The transistor comprises a first transistor, a second transistor, a first diode, a second diode and a capacitor; the emitter of the first transistor, the cathode of the first diode, the collector of the second transistor and the anode of the second diode are connected with each other to form a first end of the half-bridge sub-module circuit, the collector of the first transistor, the anode of the first diode and one end of the capacitor are connected with each other, and the emitter of the second transistor, the cathode of the second diode and the other end of the capacitor are connected with each other to form a second end of the half-bridge sub-module circuit. The transistor corresponding to each bridge arm unit of the submodule in the figure is T respectively1、T2、T3、T4The diodes are respectively D1、D2、D3、D4。
Specifically, the half-bridge sub-module is composed of a capacitor C, IGBT (T1) and its anti-parallel diode (D1), an IGBT (T2) and its anti-parallel diode (D2). The IGBT (T1) and the IGBT (T2) are connected in series and then connected in parallel with the capacitor C. The connection point of the IGBT (T1) and the IGBT (T2) is the positive pole of the sub-module, and the connection point of the IGBT (T2) and the capacitor C is the negative pole of the capacitor. When the IGBT (T1) is turned on and the IGBT (T2) is turned off, the sub-module is in an input state; when the IGBT (T2) is on and the IGBT (T1) is off, the sub-module is in the off state. The full-bridge sub-module is composed of a capacitor C, IGBT (T1) and an anti-parallel diode (D1) thereof, an IGBT (T2) and an anti-parallel diode (D2) thereof, an IGBT (T3) and an anti-parallel diode (D3) thereof, and an IGBT (T4) and an anti-parallel diode (D4) thereof. The IGBT (T1) and the IGBT (T2) are connected in series, and the IGBT (T3) and the IGBT (T4) are connected in series and then connected with the capacitor C in parallel. The connecting point of the IGBT (T1) and the IGBT (T2) is the positive pole of the submodule, and the connecting point of the IGBT (T3) and the IGBT (T4) is the negative pole of the submodule. The sub-module is in the cut-off state when the IGBT (T1) and the IGBT (T3) are on and the IGBT (T2) and the IGBT (T4) are off, or when the IGBT (T1) and the IGBT (T3) are off and the IGBT (T2) and the IGBT (T4) are on; when the IGBT (T1) and the IGBT (T4) are turned on and the IGBT (T2) and the IGBT (T3) are turned off, the sub-module is in a positive throw-in state; when the IGBT (T1) and the IGBT (T4) are turned off and the IGBT (T2) and the IGBT (T3) are turned on, the sub-module is in a negative throw state.
The second aspect of the present invention further provides an MMC valve IGBT overcurrent shutdown test method, which can be used for the converter valve overcurrent shutdown test circuit, as shown in fig. 3, and specifically includes the following steps:
s1: the pre-treatment shut-down test requires a voltage. Specifically, a direct current power supply is started to charge the MMC valve; in an optional embodiment, the voltage-sharing function and the charging of the submodules are completed by cutting off the corresponding number of submodules through the MMC valve according to the control instruction.
S2: and unlocking each converter valve submodule.
S3: adjusting the amplitude and the phase of the output voltage of each converter valve submodule to enable the test current of each submodule bridge arm unit to reach the current value of a preset maximum continuous operation state; specifically, the amplitude and the phase of the output voltage of the sample valve are adjusted to enable the test current to reach a required value, and the sample valve operates in a maximum continuous operation state. The MMC valves of different projects bear test voltage and test current which have specific requirements specified by special files.
S4: and judging whether the junction temperature of the transistor is stable or not, if so, locking the bridge arm units of the sub-modules of the converter valves, and simultaneously disconnecting the first isolating switch and the second isolating switch. Specifically, after the IGBT junction temperature of the sample valve is stabilized, the MMC valve is locked, and isolation switches K11 and K12 are opened.
S5 conducting each sub-module bridge arm unit of the first converter valve sub-module and each sub-module bridge arm unit of the second sub-module, and disconnecting each sub-module bridge arm unit of the third converter valve sub-module and each sub-module bridge arm unit of the fourth converter valve sub-module, so that a capacitor of each sub-module bridge arm unit of the first converter valve sub-module and a capacitor of each sub-module bridge arm unit of the second converter valve sub-module are discharged through each bridge arm reactor to form a test current.
S6: again, the test system was operated at maximum continuous operation, and continued until the transistor was at the required junction temperature, to assess the steady state operation function of the test valve. Specifically, returning to step S3, the test current of each bridge arm unit of the converter valve sub-module reaches the current value of the preset maximum continuous operation state again, and the current value is continuously maintained until the transistor is crystallized, so as to obtain the second test current in step S5, and the stability of each bridge arm unit of the converter valve sub-module is determined according to the first test current and the second test current, so as to obtain the stable result of each bridge arm unit of the sub-module.
Specifically, after the test is started, firstly, a direct current power supply is started to charge a test sample valve (valve 1, valve 2, valve 3 and valve 4), after the charging is completed, the test sample valve (valve 1, valve 2, valve 3 and valve 4) is unlocked, the amplitude and the phase of the output voltage of the valve 1, valve 2, valve 3 and valve 4) are adjusted, so that the test current reaches a required value, after the test sample valve (valve 1, valve 2, valve 3 and valve 4) operates in a maximum continuous operation state and lasts for a certain time, the IGBT junction temperature of the test sample valve (valve 1, valve 2, valve 3 and valve 4) is stable, all the test sample valves (valve 1, valve 2, valve 3 and valve 4) are locked, then all sub-modules in the valve 1 and valve 3 are switched in the next control period, all the sub-modules in the valve 2 and valve 4 are simultaneously cut off, the capacitors of all the sub-modules in the valve 1 and valve 3 can be automatically discharged through bridge arms (L, L, L and L) to form the test current, 6754, after the test sample valve is detected, the overcurrent is successfully cut off, the test sample valve 1 and the test sample valve 4 is successfully cut off, the IGBT current is cut off, and the test sample valve 1 and the IGBT current is cut off, the test sample valve 4, the IGBT current is shown in a test sample valve 2 and the test sample valve is cut off, and the test sample valve 4, the test sample valve is cut off.
The third aspect of the invention discloses a device for an overcurrent turn-off test of a converter valve, which is applied to the circuit for the overcurrent turn-off test of the converter valve, and comprises the following components: and the preprocessing module is used for preprocessing the voltage required by the turn-off test. And the unlocking module is used for unlocking each converter valve submodule.
The first adjusting module is used for adjusting the amplitude and the phase of the output voltage of each converter valve submodule, so that the test current of each submodule bridge arm unit reaches a preset experiment required current value.
And the locking module is used for judging whether the junction temperature of the transistor is stable or not, locking the bridge arm units of the sub-modules of the converter valves if the junction temperature of the transistor is stable, and disconnecting the first isolating switch and the second isolating switch.
And the processing module is used for conducting each sub-module bridge arm unit of the first converter valve sub-module and each sub-module bridge arm unit of the second converter valve sub-module and disconnecting each sub-module bridge arm unit of the third converter valve sub-module and each sub-module bridge arm unit of the fourth converter valve sub-module, so that the capacitor of each sub-module bridge arm unit of the first converter valve sub-module and the capacitor of each sub-module bridge arm unit of the second converter valve sub-module are discharged through each bridge arm reactor to form a first test current.
And the second adjusting module is used for obtaining a second test current according to the first adjusting module, the locking module and the processing module, judging the stability of each bridge arm unit of the converter valve submodule according to the first test current and the second test current, and obtaining a stable result of each bridge arm unit of the submodule.
According to one embodiment of the invention, the preprocessing module comprises: the first action unit is used for starting the direct current power supply. And the second action unit is used for closing the first isolating switch and the second isolating switch. And the judging unit is used for judging whether the direct-current power supply charges the terminal voltage of each converter valve submodule until the terminal voltage of each converter valve submodule reaches a rated working voltage value or not.
The technical scheme of the invention has the following beneficial technical effects: firstly, each submodule works at the maximum continuous operation load to heat, and the actual operation condition of each submodule is close to, so that the equivalence is high; secondly, the test circuit can complete the transistor overcurrent turn-off test without additionally adding equipment; and thirdly, the transistor overcurrent turn-off tests of the bridge arm units of the plurality of sub-modules can be carried out at a time, and the test efficiency is submitted.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A circuit for converter valve over-current shutdown testing, the circuit comprising: the system comprises a direct-current power supply, an isolating switch, a filter reactor and at least two phase units;
the phase unit comprises at least two converter valves, a bridge arm reactor and a load reactor, wherein the converter valves are connected through the bridge arm reactor; the alternating current sides of the at least two phase units are connected through the load reactor; the direct current sides of the at least two phase units are connected;
and the direct current power supply is connected with the direct current side of the phase unit through the isolating switch and the filter reactor.
2. The circuit of claim 1, wherein the isolation switch comprises a first isolation switch and a second isolation switch; the filter reactor comprises a first filter reactor and a second filter reactor,
the direct current power supply is connected with one end of the direct current side of the phase unit through the first isolating switch and the first filter reactor, and is connected with the other end of the direct current side of the phase unit through the second isolating switch and the second filter reactor.
3. The circuit according to claim 1 or 2, wherein the two phase units comprise a first bridge arm unit, a second bridge arm unit, a third bridge arm unit, a fourth bridge arm unit and a load reactor, and the first bridge arm unit, the second bridge arm unit, the third bridge arm unit, the fourth bridge arm unit and the load reactor are connected in a bridge manner.
4. The circuit of claim 3, wherein the first leg unit comprises a first converter valve sub-module and a first leg reactor, wherein a positive pole of the first converter valve sub-module is connected to one end of the first filter reactor, and wherein a negative pole of the first converter valve sub-module is connected to one end of the first leg reactor; the second bridge arm unit comprises a second converter valve submodule and a second bridge arm reactor, the positive electrode of the second converter valve submodule is connected with one end of the first filter reactor, and the negative electrode of the second converter valve submodule is connected with one end of the second bridge arm reactor; the third bridge arm unit comprises a third converter valve submodule and a third bridge arm reactor, the anode of the third converter valve submodule is connected with one end of the third bridge arm reactor, and the cathode of the third converter valve submodule is connected with one end of the second filter reactor; the fourth bridge arm unit comprises a fourth converter valve submodule and a fourth bridge arm reactor, the positive electrode of the fourth converter valve submodule is connected with one end of the fourth bridge arm reactor, and the negative electrode of the fourth converter valve submodule is connected with one end of the second filter reactor;
the other end of the first bridge arm reactor and the other end of the third bridge arm reactor are connected with one end of the load reactor, and the other end of the second bridge arm reactor and the other end of the fourth bridge arm reactor are connected with the other end of the load reactor.
5. The circuit of claim 4, wherein each converter valve sub-module comprises a plurality of full-bridge sub-module circuits or a plurality of half-bridge sub-module circuits;
the number of full-bridge sub-module circuits or the number of half-bridge sub-module circuits of each converter valve sub-module is not less than 5.
6. The circuit of claim 5,
the full-bridge submodule circuit comprises: the bridge arm comprises a first submodule bridge arm unit, a second submodule bridge arm unit, a capacitor, a third submodule bridge arm unit and a fourth submodule bridge arm unit; the second end of the first sub-module bridge arm unit and one end of the second sub-module bridge arm unit are mutually connected to form a first end of the full-bridge sub-module circuit; the first end of the first sub-module bridge arm unit, the first end of the third sub-module bridge arm unit and one end of the capacitor are connected with each other; the second end of the second sub-module bridge arm unit and the second end of the fourth sub-module bridge arm unit are connected with the other end of the capacitor; the second end of the third sub-module bridge arm unit and the first end of the fourth sub-module bridge arm unit are mutually connected to form the second end of the full-bridge sub-module circuit;
or, the half-bridge sub-module circuit comprises: the half-bridge sub-module circuit comprises a first sub-module bridge arm unit, a second sub-module bridge arm unit and a capacitor, wherein one end of the first sub-module bridge arm unit and one end of the second sub-module bridge arm unit are connected with each other to form a first end of the half-bridge sub-module circuit, the other end of the first sub-module bridge arm unit is connected with one end of the capacitor, and the other end of the second sub-module bridge arm unit and the other end of the capacitor are connected with each other to form a second end of the half-bridge sub;
the bridge arm unit comprises a submodule and a submodule bridge arm unit, wherein the submodule bridge arm unit comprises a transistor and a diode, a collector electrode of the transistor and an anode of the diode are connected with each other to form a first end of the submodule bridge arm unit, and an emitter electrode of the transistor and a cathode of the diode are connected with each other to form a second end of the submodule bridge arm unit.
7. Method for converter valve overcurrent turn-off test, characterized in that the method is used in a circuit for converter valve overcurrent turn-off test according to any one of claims 1 to 6, the method comprising:
s1, preprocessing the required voltage of the turn-off test;
s2, unlocking each converter valve submodule;
s3, adjusting the amplitude and the phase of the output voltage of each converter valve submodule to enable the test current of each converter valve submodule bridge arm unit to reach the current value of the preset maximum continuous operation state;
s4, judging whether the junction temperature of the transistor is stable, if so, locking the bridge arm units of the sub-modules of the converter valves, and simultaneously disconnecting the first isolating switch and the second isolating switch;
s5, conducting each sub-module bridge arm unit of the first converter valve sub-module and each sub-module bridge arm unit of the second converter valve sub-module, and disconnecting each sub-module bridge arm unit of the third converter valve sub-module and each sub-module bridge arm unit of the fourth converter valve sub-module, so that the capacitor of each sub-module bridge arm unit of the first converter valve sub-module and the capacitor of each sub-module bridge arm unit of the second converter valve sub-module are discharged through each bridge arm reactor to form a first test current;
and S6, returning to the step S3 to obtain a second test current, and judging the stability of each bridge arm unit of the converter valve submodule according to the first test current and the second test current to obtain a stable result of each bridge arm unit of the converter valve submodule.
8. The method according to claim 7, wherein the preprocessing the turn-off test required voltage in the S1 includes:
starting a direct current power supply;
closing the first and second isolation switches;
and the direct-current power supply charges the terminal voltage of each converter valve submodule until the terminal voltage of each converter valve submodule reaches the rated working voltage.
9. The device for the converter valve overcurrent turn-off test is applied to a circuit for the converter valve overcurrent turn-off test as claimed in any one of claims 1 to 6, and comprises the following components:
the preprocessing module is used for preprocessing the voltage required by the turn-off test;
the unlocking module is used for unlocking each converter valve submodule;
the first adjusting module is used for adjusting the amplitude and the phase of the output voltage of each converter valve submodule so that the test current of each converter valve submodule bridge arm unit reaches a preset experiment required current value;
the locking module is used for judging whether the junction temperature of the transistor is stable or not, locking the bridge arm units of the sub-modules of the converter valves if the junction temperature of the transistor is stable, and disconnecting the first isolating switch and the second isolating switch;
the processing module is used for conducting each sub-module bridge arm unit of the first converter valve sub-module and each sub-module bridge arm unit of the second converter valve sub-module and disconnecting each sub-module bridge arm unit of the third converter valve sub-module and each sub-module bridge arm unit of the fourth converter valve sub-module, so that the capacitor of each sub-module bridge arm unit of the first sub-module and the capacitor of each sub-module bridge arm unit of the second converter valve sub-module are discharged through each bridge arm reactor to form a first test current;
and the second adjusting module is used for obtaining a second test current according to the first adjusting module, the locking module and the processing module, judging the stability of each sub-module bridge arm unit according to the first test current and the second test current, and obtaining a stable result of each sub-module bridge arm unit.
10. The apparatus of claim 9, wherein the pre-processing module comprises:
the first action unit is used for starting the direct-current power supply;
the second action unit is used for closing the first isolating switch and the second isolating switch;
and the judging unit is used for judging whether the terminal voltage of each submodule charged by the direct-current power supply to each submodule reaches a rated working voltage value or not.
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| CN202010290234.XA CN111398772A (en) | 2020-04-14 | 2020-04-14 | Circuit, method and device for converter valve overcurrent turn-off test |
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| CN202010290234.XA CN111398772A (en) | 2020-04-14 | 2020-04-14 | Circuit, method and device for converter valve overcurrent turn-off test |
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| CN113203912A (en) * | 2021-07-06 | 2021-08-03 | 清华大学 | Current source converter valve equivalent power experiment circuit, system and method |
| CN113655324A (en) * | 2021-09-03 | 2021-11-16 | 广东电网有限责任公司广州供电局 | Converter valve operation test topology platform |
| CN114062743A (en) * | 2021-11-11 | 2022-02-18 | 青岛鼎信通讯股份有限公司 | Full-bridge switch characteristic current generating device applied to power industry |
| CN114167167A (en) * | 2021-11-15 | 2022-03-11 | 许继集团有限公司 | Modular multilevel converter short-circuit current test device and test method |
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| CN114167167B (en) * | 2021-11-15 | 2024-02-09 | 许继集团有限公司 | Short-circuit current test device and test method for modularized multi-level converter |
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