Converter valve overvoltage suppression method and device

Abstract

The invention discloses a converter valve overvoltage suppression method and device which is applied to a power transmission system in which a direct current energy consumption device is configured at a direct current port of a converter valve, wherein the method comprises the steps of detecting whether a direct current power transmission system is in a converter valve overvoltage working condition or not; when the direct current power transmission system is in the converter valve overvoltage working condition, outputting a direct current energy consumption device input instruction, wherein the direct current energy consumption device input instruction is used for being connected into a direct current energy consumption device to consume the energy at the direct current port of the converter valve so as to reduce the voltage of the converter valve port. According to the present invention, the direct current energy consumption device configured in the system is used for reducing the overvoltage of the converter valve, the function of the direct current energy consumption device is fully utilized, additional arrangement of the overvoltage protection device of the converter valve can be avoided, and the system input cost is reduced.

Description

technical field [0001] The invention relates to the field of converter valves, in particular to a method and device for suppressing overvoltage of a converter valve. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] In the flexible direct current transmission system based on Modular Multilevel Converter (MMC), when the transformer valve side occurs in the converter station (the side where the transformer is connected to the grid is called the grid side, and the side where the transformer is connected to the rectifier When a single-phase ground fault occurs, the DC line may have a large parasitic capacitance, and the non-faulty converter station will still collapse after the faulty converter station is blocked due to its own station protection or slow inter-station communication...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a converter valve overvoltage suppression method, which is applied to a DC power transmission system equipped with a DC energy-consuming device at the DC port of the converter valve to solve the existing problem of suppressing the overvoltage of the converter valve by adding a surge arrester. However, there is a technical problem of increasing the size of the converter station and increasing the cost of primary equipment investment. The method includes: detecting whether the DC transmission system is in the overvoltage condition of the converter valve; when the DC transmission system is in the overvoltage condition of the converter valve In the case of the DC energy consumption device input command, the input command of the DC energy consumption device is used to connect the DC energy consumption device to consume the energy of the DC port of the converter valve

[0007] The embodiment of the present invention also provides a converter valve overvoltage suppressing device, which is applied to a DC power transmission system equipped with a DC energy consumption device at the DC port of the converter valve to solve the problem of suppressing the overvoltage of the converter valve by adding a surge arrester. The voltage solution has the technical problem of increasing the volume of the converter station and increasing the investment cost of primary equipment. The device includes: a converter valve overvoltage detection module, which is used to detect whether the DC transmission system is in the converter valve overvoltage condition; A control module, configured to output a DC energy consumption device input command when the DC power transmission system is in the overvoltage condition of the converter valve, wherein the DC energy consumption device input command is used to connect to the DC energy consumption device to consume the converter Energy at the DC port of the valve

[0008] In the embodiment of the present invention, a computer device is also provided to solve the technical problem of increasing the volume of the converter station and increasing the investment cost of primary equipment in the existing solution of adding a surge arrester to suppress the overvoltage of the converter valve. The computer device includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the above-mentioned converter valve overvoltage suppression method is implemented when the processor executes the computer program

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