CN110763970B - Method for testing breakover voltage of protection thyristor of MMC power module - Google Patents
Method for testing breakover voltage of protection thyristor of MMC power module Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a method for testing the breakover voltage of a protection thyristor of an MMC power module, wherein a testing party is carried out by adopting a protection thyristor breakover voltage testing device, and the protection thyristor breakover voltage testing device comprises a direct-current power supply S, a heating clamp, a current meter and a voltmeter; according to the method, the actual operation conditions of the protective thyristors in the half-bridge power module and the full-bridge power module out of control are simulated respectively, and the turning voltage of the thyristors can be accurately tested, so that the thyristors suitable for the power module are screened more accurately, the damage loss of the power module caused by breakdown of an IGBT (insulated gate bipolar transistor) element is reduced, the forced shutdown probability of the whole current converter is reduced, and the operation reliability of the system is improved.
Description
Technical Field
The invention relates to the technical field of electricity, in particular to a method for testing the breakover voltage of a protection thyristor of an MMC power module.
Background
With the rapid development of flexible dc transmission technology, Modular Multilevel Converters (MMC) have been applied to engineering. The converter in this form is composed of thousands of power modules (see topology fig. 1 and fig. 2), and if a certain power module loses control (an IGBT cannot trigger), the voltage of a capacitor rises, so that the IGBT in the power module is subjected to overvoltage breakdown to form an open circuit state, and finally the whole converter is forced to stop running. In order to solve the problem, a protection thyristor is added at the port of the power module. If the power module loses control, the voltage of the module capacitor rises and exceeds the breakover voltage of the thyristor, the protective thyristor is broken down and forms a passage, and the operation of the current converter is not influenced. Therefore, it is important to screen thyristors within the acceptable breakover voltage range. However, the current testing method for the breakover voltage of the protection thyristor is not consistent with the actual operation condition of the power module, so that the breakover voltage deviation of the protection thyristor sieve is large.
Disclosure of Invention
The invention provides a method for testing the breakover voltage of a protection thyristor of an MMC power module, which aims to solve the problem that the breakover voltage deviation of a protection thyristor sieve is large due to the fact that the existing method for testing the breakover voltage of the protection thyristor is not consistent with the actual operation working condition of the power module.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for testing the breakover voltage of a protection thyristor of an MMC power module is characterized in that a testing party is carried out by adopting a protection thyristor breakover voltage testing device, and the protection thyristor breakover voltage testing device comprises a direct-current power supply S, a heating clamp, a current meter and a voltmeter; a first switching branch is connected in parallel with two ends of the direct current power supply S, a switch Q1 and a switch Q4 are connected in series in the first switching branch, a second switching branch is connected in parallel with two ends of the first switching branch, and a switch Q2 and a switch Q3 are connected in series in the second switching branch; one end of a power interface of the heating clamp is connected between the circuits of the switch Q1 and the switch Q4, and the other end of the power interface of the heating clamp is connected between the circuits of the switch Q2 and the switch Q3; the voltmeter is used for measuring the voltage at two ends of the heating clamp, and the ammeter is used for measuring the current passing through the heating clamp;
the test method comprises a half-bridge power module protection thyristor transition voltage test, wherein the half-bridge power module protection thyristor transition voltage test comprises the following steps:
step 1: adjusting the voltage of a direct current power supply S to 0;
step 2: installing the protective thyristor T into a heating clamp, and heating to the temperature of a cold water inlet valve in the power module;
and step 3: keeping switch Q3 closed and switch Q2 open;
and 4, step 4: the switch Q1 is closed, the switch Q4 is opened, and the set time T1 is kept;
and 5: the switch Q1 is opened, the switch Q4 is closed, and the set time T2 is kept;
step 6: gradually increasing the voltage of the direct current power supply S, repeating the steps 4 and 5, and observing the current value displayed by the ammeter;
and 7: if the current value of the ammeter is suddenly increased, the voltage value at the moment is the breakover voltage of the thyristor at the temperature.
Further, the set times T1 and T2 are both 10 ms.
Further, the test method further comprises a full-bridge power module protection thyristor breakover voltage test, wherein the full-bridge power module protection thyristor breakover voltage test comprises the following steps:
step 1: adjusting the voltage of a direct current power supply S to 0;
step 2: installing the protective thyristor T into a heating clamp, and heating to the temperature of a cold water inlet valve in the power module;
and step 3: simultaneously closing the switches Q1 and Q3 and simultaneously opening the switches Q2 and Q4, and keeping the set time T3;
and 4, step 4: the switches Q1 and Q3 are opened at the same time, and the switches Q2 and Q4 are closed at the same time, and the set time T4 is kept;
and 5: gradually increasing the voltage of the direct current power supply S, repeating the steps 3 and 4, and observing the current value I displayed by the ammeter;
step 6: if the current value I of the ammeter is suddenly increased, the voltage value at the moment is the breakover voltage of the thyristor at the temperature.
Further, the set times T3 and T4 are both 10 ms.
Further, the inlet valve temperature of the internal cooling water is 45 ℃.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the actual operation conditions of the protective thyristors in the half-bridge power module and the full-bridge power module out of control are respectively simulated, and the turning voltage of the thyristors can be accurately tested, so that the thyristors suitable for the power module can be more accurately screened, the damage loss of the power module caused by the breakdown of IGBT elements is reduced, the forced shutdown probability of the whole current converter is reduced, and the operation reliability of the system is improved.
Drawings
FIG. 1 is a half-bridge power module topology;
FIG. 2 is a full bridge power module topology;
fig. 3 is a testing schematic diagram of a breakover voltage testing apparatus of a protection thyristor according to an embodiment of the present invention;
FIG. 4 is a timing voltage diagram of a half-bridge power module protective thyristor;
fig. 5 is a timing voltage diagram of the protection thyristor of the full-bridge power module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Example (b):
referring to fig. 3-5, a schematic diagram of a testing apparatus for a breakover voltage of a protection thyristor according to the present embodiment is shown, where the testing apparatus for a breakover voltage of a protection thyristor includes a dc power supply S, a heating fixture, a current meter, and a voltage meter.
The two ends of the direct current power supply S are connected with a first switch branch in parallel, a switch Q1 and a switch Q4 are connected in series in the first switch branch, the positive pole of the direct current power supply S is connected with the switch Q1, and the negative pole of the direct current power supply S is connected with the switch Q4; a second switching branch is connected in parallel at two ends of the first switching branch, a switch Q2 and a switch Q3 are connected in series in the second switching branch, the positive pole of a direct current power supply S of the switch Q2 is connected, and the negative pole of the direct current power supply S of the switch Q3 is connected; one end of a power interface of the heating clamp is connected between the circuits of the switch Q1 and the switch Q4, and the other end of the power interface of the heating clamp is connected between the circuits of the switch Q2 and the switch Q3; the voltmeter is used for measuring the voltage across the heating fixture, and the ammeter is used for measuring the current passing through the heating fixture.
Specifically, in this embodiment, the method for testing the breakover voltage of the protection thyristor of the MMC power module mainly includes two parts, namely a half-bridge power module breakover voltage test and a full-bridge power module breakover voltage test.
Wherein, this half-bridge power module protection thyristor turn voltage test includes:
step 1: adjusting the voltage of a direct current power supply S to 0;
step 2: installing the protective thyristor T into a heating clamp, and heating to the temperature of a cold water inlet valve in the power module;
and step 3: keeping switch Q3 closed and switch Q2 open;
and 4, step 4: the switch Q1 is closed, the switch Q4 is opened, and the set time T1 is kept;
and 5: the switch Q1 is opened, the switch Q4 is closed, and the set time T2 is kept;
step 6: gradually increasing the voltage of the direct current power supply S, repeating the steps 4 and 5, and observing the current value displayed by the ammeter;
and 7: if the current value of the ammeter is suddenly increased, the voltage value at the moment is the breakover voltage of the thyristor at the temperature.
Therefore, the method can simulate the actual operation condition of the half-bridge power module out of control, and can accurately test the turn voltage of the thyristor, so that the thyristor suitable for the power module is more accurately screened, the loss of power module damage caused by breakdown of an IGBT element is reduced, the probability of forced shutdown of the whole converter is reduced, and the reliability of system operation is improved.
Specifically, the set time T1 and the set time T2 are both 10ms, and the temperature of the internal cooling water inlet valve is 45 ℃, so as to more closely simulate the actual operation condition of the runaway half-bridge power module.
Wherein, this full-bridge power module protection thyristor breakover voltage test includes:
step 1: adjusting the voltage of a direct current power supply S to 0;
step 2: installing the protective thyristor T into a heating clamp, and heating to the temperature of a cold water inlet valve in the power module;
and step 3: simultaneously closing the switches Q1 and Q3 and simultaneously opening the switches Q2 and Q4, and keeping the set time T3;
and 4, step 4: the switches Q1 and Q3 are opened at the same time, and the switches Q2 and Q4 are closed at the same time, and the set time T4 is kept;
and 5: gradually increasing the voltage of the direct current power supply S, repeating the steps 3 and 4, and observing the current value I displayed by the ammeter;
step 6: if the current value I of the ammeter is suddenly increased, the voltage value at the moment is the breakover voltage of the thyristor at the temperature.
Therefore, the method can simulate the actual operation condition of the out-of-control full-bridge power module, and can accurately test the breakover voltage of the thyristor, so that the thyristor suitable for the power module is more accurately screened, the loss of the power module damage caused by the breakdown of the IGBT element is reduced, the forced outage probability of the whole current converter is reduced, and the reliability of the system operation is improved.
Specifically, the set time T1 and the set time T2 are both 10ms, and the temperature of the internal cooling water inlet valve is 45 ℃, so as to more closely simulate the actual operation condition of the uncontrolled full-bridge power module.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (5)
1. A method for testing the breakover voltage of a protection thyristor of an MMC power module is characterized in that the testing method is carried out by adopting a protection thyristor breakover voltage testing device, and the protection thyristor breakover voltage testing device comprises a direct-current power supply S, a heating clamp, a current meter and a voltmeter; a first switching branch is connected in parallel with two ends of the direct current power supply S, a switch Q1 and a switch Q4 are connected in series in the first switching branch, a second switching branch is connected in parallel with two ends of the first switching branch, and a switch Q2 and a switch Q3 are connected in series in the second switching branch; one end of a power interface of the heating clamp is connected between the circuits of the switch Q1 and the switch Q4, and the other end of the power interface of the heating clamp is connected between the circuits of the switch Q2 and the switch Q3; the voltmeter is used for measuring the voltage at two ends of the heating clamp, and the ammeter is used for measuring the current passing through the heating clamp;
the test method comprises a half-bridge power module protection thyristor transition voltage test, wherein the half-bridge power module protection thyristor transition voltage test comprises the following steps:
step 1: adjusting the voltage of a direct current power supply S to 0;
step 2: installing the protective thyristor T into a heating clamp, and heating to the temperature of a cold water inlet valve in the power module;
and step 3: keeping switch Q3 closed and switch Q2 open;
and 4, step 4: the switch Q1 is closed, the switch Q4 is opened, and the set time T1 is kept;
and 5: the switch Q1 is opened, the switch Q4 is closed, and the set time T2 is kept;
step 6: gradually increasing the voltage of the direct current power supply S, repeating the steps 4 and 5, and observing the current value displayed by the ammeter;
and 7: if the current value of the ammeter is suddenly increased, the voltage value at the moment is the breakover voltage of the thyristor at the temperature.
2. The method for testing breakover voltage of a protection thyristor of an MMC power module of claim 1, wherein the set times T1 and T2 are both 10 ms.
3. The MMC power module protection thyristor breakover voltage test method of claim 1, further comprising a full-bridge power module protection thyristor breakover voltage test comprising:
step 1: adjusting the voltage of a direct current power supply S to 0;
step 2: installing the protective thyristor T into a heating clamp, and heating to the temperature of a cold water inlet valve in the power module;
and step 3: simultaneously closing the switches Q1 and Q3 and simultaneously opening the switches Q2 and Q4, and keeping the set time T3;
and 4, step 4: the switches Q1 and Q3 are opened at the same time, and the switches Q2 and Q4 are closed at the same time, and the set time T4 is kept;
and 5: gradually increasing the voltage of the direct current power supply S, repeating the steps 3 and 4, and observing the current value I displayed by the ammeter;
step 6: if the current value I of the ammeter is suddenly increased, the voltage value at the moment is the breakover voltage of the thyristor at the temperature.
4. The method for testing breakover voltage of a protection thyristor of an MMC power module of claim 3, wherein the set times T3 and T4 are both 10 ms.
5. The method for testing breakover voltage of the MMC power module protection thyristor of claim 1 or 3, wherein the internal cooling water inlet valve temperature is 45 ℃.
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