CN111999574A - MMC power module low-voltage pressurization testing device and method - Google Patents
MMC power module low-voltage pressurization testing device and method Download PDFInfo
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- CN111999574A CN111999574A CN202010747132.6A CN202010747132A CN111999574A CN 111999574 A CN111999574 A CN 111999574A CN 202010747132 A CN202010747132 A CN 202010747132A CN 111999574 A CN111999574 A CN 111999574A
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- 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
Abstract
A MMC power module low pressure pressurization testing device and method, the device includes: the power supply comprises a DC1000V adjustable power supply, a 24V power supply, a current-limiting resistor R1, a bleeder resistor R2, a high-voltage relay KM1 and a selector switch Q1; the DC1000V adjustable voltage and the 24V power supply are connected to an alternating current power supply; the DC1000V adjustable power supply is connected in series with a current-limiting resistor R1, and the output voltage range is 0-1000V; the two output ends DC + and DC-are respectively provided with a plurality of connecting ports for connecting a plurality of MMC power sub-modules; two ends of a 24V power supply are connected with a selection switch Q1, a high-voltage relay KM1 and a bleeder resistor R2 in series; and the bleeder resistor R2 is connected in parallel across the two output terminals DC + and DC-. According to the invention, the half-bridge power module is tested by the low-voltage pressurization testing device, and a plurality of sub-modules can be tested simultaneously, so that the testing efficiency of the sub-modules is greatly improved, and the labor cost is saved.
Description
Technical Field
The invention relates to the technical field of testing of power modules of flexible direct-current power transmission converter valves, in particular to a device and a method for testing low-voltage pressurization of an MMC power module.
Background
With the continuous development of flexible dc power transmission technology, Modular Multilevel Converters (MMC) have been widely used in practical engineering. The converter in this form is composed of a large number of cascaded power modules (topology is shown in fig. 1), and in the debugging process of the MMC power module, various functions of the sub-modules must be tested. Wherein the rated pressurization of the sub-module is an important step of the sub-module test. The currently commonly used rated pressurization test method is as follows: the submodule capacitor is supplied with power through the submodule tester, only one submodule can be tested by the method, time and labor are consumed in the large-batch maintenance and test process of the MMC, and efficiency is low. To solve this problem, a voltage and a bleed voltage are applied to the sub-modules by a low voltage pressurization test device. The low-voltage pressurization testing device is connected with the two sub-modules through four outgoing lines. By the mode, a plurality of sub-modules can be tested simultaneously, so that the testing efficiency of the sub-modules is greatly improved, and the labor cost is saved.
Disclosure of Invention
The invention aims to provide a low-pressure pressurization testing device and method for an MMC power module, which are used for solving the problems of time and labor consumption and low efficiency in the existing large-batch MMC overhaul testing process.
To achieve the above object, a first aspect of the present invention provides a MMC power module low-voltage pressurization test apparatus, including: the power supply comprises a DC1000V adjustable power supply, a 24V power supply, a current-limiting resistor R1, a bleeder resistor R2, a high-voltage relay KM1 and a selector switch Q1;
the DC1000V adjustable voltage and the 24V power supply are connected to an alternating current power supply;
the DC1000V adjustable power supply is connected in series with a current-limiting resistor R1, and the output voltage range is 0-1000V; the two output ends DC + and DC-are respectively provided with a plurality of connecting ports for connecting a plurality of MMC power sub-modules;
two ends of the 24V power supply are connected with a selection switch Q1, a high-voltage relay KM1 and a bleeder resistor R2 in series;
and the bleeder resistor R2 is connected in parallel across the two output terminals DC + and DC-.
Further, the power supply also comprises a signal lamp D1 which is connected in series with two ends of the 24V power supply and is used for indicating the on-off of the selection switch Q1.
Further, the supply voltage range of the alternating current power supply is 220VAC +/-15%.
Further, the setting value of the DC1000V adjustable power supply is 500V.
The invention provides a MMC power module low-pressure pressurization test method, which uses the MMC power module low-pressure pressurization test device for testing and comprises the following steps:
the low-voltage pressurization testing device is connected with 220V alternating current;
the output DC + and DC-of the DC1000V adjustable power supply are connected to two ends of a capacitor of two or more MMC power sub-modules, a switch of the DC1000V adjustable power supply is closed, and the adjustable power supply is manually adjusted to enable the sub-modules to be boosted to a set value;
after the test is finished, a switch of the DC1000V adjustable power supply is turned off, the output end is disconnected, a selection switch Q1 is turned to the 'closed' position, a signal lamp D1 is lightened, a high-voltage relay KM1 is closed, and the voltage of the capacitor of the MMC power sub-module is released;
after the capacitor voltage is discharged, the selection switch Q1 is turned to the 'minute' position, the signal lamp D1 is turned off, and the high-voltage relay KM1 is opened.
Further, the setting value of the DC1000V adjustable power supply is 500V.
Further, the opening is bled to DC1000V and the voltage on the adjustable power supply display screen is below 5V.
In summary, the present invention provides a device and a method for testing a low-voltage pressurization of an MMC power module, the device includes: the power supply comprises a DC1000V adjustable power supply, a 24V power supply, a current-limiting resistor R1, a bleeder resistor R2, a high-voltage relay KM1 and a selector switch Q1; the DC1000V adjustable voltage and the 24V power supply are connected to an alternating current power supply; the DC1000V adjustable power supply is connected in series with a current-limiting resistor R1, and the output voltage range is 0-1000V; the two output ends DC + and DC-are respectively provided with a plurality of connecting ports for connecting a plurality of MMC power sub-modules; two ends of a 24V power supply are connected with a selection switch Q1, a high-voltage relay KM1 and a bleeder resistor R2 in series; and the bleeder resistor R2 is connected in parallel across the two output terminals DC + and DC-. According to the invention, the half-bridge power module is tested by the low-voltage pressurization testing device, and a plurality of sub-modules can be tested simultaneously, so that the testing efficiency of the sub-modules is greatly improved, and the labor cost is saved.
Drawings
FIG. 1 is a topology structure diagram of an MMC power sub-module of an embodiment of the present invention;
FIG. 2 is a topology structure diagram of a MMC power module low-voltage pressurization testing device according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a low-voltage pressurization testing method for an MMC power module according to an embodiment of the present invention.
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.
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a topology diagram of an MMC power sub-module according to an embodiment of the present invention is a half-bridge power sub-module, which includes two power electronic devices T1 and T2 connected in series, two ends of T1 and T2 are respectively connected in parallel with diodes D1 and D2, two ends of T1 and T2 are connected in parallel with a resistor R and a capacitor C, and two ends of T2 are connected in parallel with a switch K and a diode T. And two ends of the capacitor C are connected into the MMC power module low-voltage pressurization testing device for testing.
A first aspect of the present invention provides a low-pressure pressurization testing apparatus for an MMC power module, as shown in fig. 2, including: the power supply comprises a DC1000V adjustable power supply, a 24V power supply, a current-limiting resistor R1, a bleeder resistor R2, a high-voltage relay KM1 and a selector switch Q1; the DC1000V adjustable voltage and the 24V power supply are connected to an alternating current power supply; the DC1000V adjustable power supply is connected in series with a current-limiting resistor R1, and the output voltage range is 0-1000V; the two output ends DC + and DC-are respectively provided with a plurality of connecting ports (two in the figure, but not limited to the two ports) for connecting a plurality of MMC power sub-modules; two ends of a 24V power supply are connected with a selection switch Q1, a high-voltage relay KM1 and a bleeder resistor R2 in series; and the bleeder resistor R2 is connected in parallel across the two output terminals DC + and DC-.
Further, the power supply also comprises a signal lamp D1 which is connected in series with two ends of the 24V power supply and is used for indicating the on-off of the selection switch Q1.
Further, the supply voltage range of the alternating current power supply is 220VAC +/-15%.
Further, the setting value of the DC1000V adjustable power supply is 500V.
Wherein, the electricity-taking voltage range of the low-voltage pressurization testing device is 220VAC +/-15%; two ends of the DC1000V adjustable power supply are connected with a current-limiting resistor R1 in series, the output voltage range of the device is 0-1000V, two ends of the DC output of the device are respectively added to two ends of two or more different sub-module capacitors, and an operator manually operates a key of the DC1000V adjustable power supply to achieve the purpose of pressurizing a power module; and a signal lamp D1, a selection switch Q1, a high-voltage relay KM1 and a discharge resistor R2 are connected in series at two ends of the 24V power supply. After the pressurization is finished, a button for turning off the DC1000V adjustable power supply; and opening the drain, and turning off the drain after the voltage on the DC1000V adjustable power supply display screen is lower than 5V, and finishing the test.
A second aspect of the present invention provides a method for testing a MMC power module under low pressure, using the apparatus for testing a MMC power module under low pressure as described above, as shown in fig. 3, including the following steps:
s100, a low-voltage pressurization testing device is connected with 220V alternating current;
s200, connecting output DC + and output DC-of the DC1000V adjustable power supply to two ends of a capacitor of two or more MMC power sub-modules, closing a switch of the DC1000V adjustable power supply, and manually adjusting the adjustable power supply to enable the sub-modules to be boosted to a set value;
step S300, after the test is finished, turning off a switch of the DC1000V adjustable power supply, disconnecting an output end, turning on a selector switch Q1 to a closed position, turning on a signal lamp D1, turning on a high-voltage relay KM1, and discharging the voltage of a capacitor of the MMC power sub-module;
step S400, after the capacitor voltage is discharged, the selection switch Q1 is turned to the 'minute' position, the signal lamp D1 is turned off, and the high-voltage relay KM1 is separated.
Further, the setting value of the DC1000V adjustable power supply is 500V.
Further, the opening is bled to DC1000V and the voltage on the adjustable power supply display screen is below 5V.
In summary, the present invention provides a device and a method for testing a low-voltage pressurization of an MMC power module, the device includes: the power supply comprises a DC1000V adjustable power supply, a 24V power supply, a current-limiting resistor R1, a bleeder resistor R2, a high-voltage relay KM1 and a selector switch Q1; the DC1000V adjustable power supply and the 24V power supply are connected to an alternating current power supply; the DC1000V adjustable power supply is connected in series with a current-limiting resistor R1, and the output voltage range is 0-1000V; the two output ends DC + and DC-are respectively provided with a plurality of connecting ports for connecting a plurality of MMC power sub-modules; two ends of a 24V power supply are connected with a selection switch Q1, a high-voltage relay KM1 and a bleeder resistor R2 in series; and the bleeder resistor R2 is connected in parallel across the two output terminals DC + and DC-. According to the invention, the half-bridge power module is tested by the low-voltage pressurization testing device, and a plurality of sub-modules can be tested simultaneously, so that the testing efficiency of the sub-modules is greatly improved, and the labor cost is saved.
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 (7)
1. The utility model provides a MMC power module low pressure pressurization testing arrangement which characterized in that includes: the power supply comprises a DC1000V adjustable power supply, a 24V power supply, a current-limiting resistor R1, a bleeder resistor R2, a high-voltage relay KM1 and a selector switch Q1;
the DC1000V adjustable voltage and the 24V power supply are connected to an alternating current power supply;
the DC1000V adjustable power supply is connected in series with a current-limiting resistor R1, and the output voltage range is 0-1000V; the two output ends DC + and DC-are respectively provided with a plurality of connecting ports for connecting a plurality of MMC power sub-modules;
two ends of the 24V power supply are connected with a selection switch Q1, a high-voltage relay KM1 and a bleeder resistor R2 in series;
and the bleeder resistor R2 is connected in parallel across the two output terminals DC + and DC-.
2. The MMC power module low-voltage pressurization test device of claim 1, further comprising a signal lamp D1 connected in series across the 24V power source for indicating the opening of a selection switch Q1.
3. The MMC power module low-voltage pressurization test device of claim 1 or 2, wherein the supply voltage range of the AC power source is 220VAC ± 15%.
4. The MMC power module low-voltage pressurization test device of claim 1 or 2, wherein the DC1000V adjustable power supply is set at 500V.
5. A MMC power module low-pressure pressurization test method, characterized in that, using the MMC power module low-pressure pressurization test device of any of claims 1-4 to test, includes the following steps:
the low-voltage pressurization testing device is connected with 220V alternating current;
the output DC + and DC-of the DC1000V adjustable power supply are connected to two ends of a capacitor of two or more MMC power sub-modules, a switch of the DC1000V adjustable power supply is closed, and the adjustable power supply is manually adjusted to enable the sub-modules to be boosted to a set value;
after the test is finished, a switch of the DC1000V adjustable power supply is turned off, the output end is disconnected, a selection switch Q1 is turned to the 'closed' position, a signal lamp D1 is lightened, a high-voltage relay KM1 is closed, and the voltage of the capacitor of the MMC power sub-module is released;
after the capacitor voltage is discharged, the selection switch Q1 is turned to the 'minute' position, the signal lamp D1 is turned off, and the high-voltage relay KM1 is opened.
6. The MMC power module low-voltage stress test method of claim 5, wherein the DC1000V adjustable power supply is set to 500V.
7. The MMC power module low-voltage boost test method of claim 5, wherein the open drain to DC1000V adjustable power supply display screen voltage is below 5V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010747132.6A CN111999574A (en) | 2020-07-29 | 2020-07-29 | MMC power module low-voltage pressurization testing device and method |
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