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An overvoltage protection circuit and method for a converter sub-module

A technology of overvoltage protection circuit and inverter, which is applied in the direction of emergency protection circuit devices and electrical components, etc., and can solve the problems of being unable to provide overvoltage protection function, affecting the power supply of voltage detection circuit, and the overvoltage protection circuit cannot work normally, etc.

Active Publication Date: 2018-08-17
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The voltage detection circuit of the sub-module is generally an active circuit. If the control power supply of the sub-module is abnormal, it will affect the power supply of the voltage detection circuit, and then the entire overvoltage protection circuit will not work normally, and it will not be able to provide reliable overvoltage protection. Protective function

Method used

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  • An overvoltage protection circuit and method for a converter sub-module
  • An overvoltage protection circuit and method for a converter sub-module
  • An overvoltage protection circuit and method for a converter sub-module

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Embodiment Construction

[0050] In the embodiment of the present invention, the sampling circuit samples the voltage of the converter sub-module to obtain a sampling voltage, the overvoltage detection circuit detects the sampling voltage, and turns on when the sampling voltage exceeds the voltage threshold, and the circuit breaker excitation control The circuit is turned on when the voltage detection circuit is turned on, and the circuit breaker bypasses the converter sub-module when the circuit breaker excitation control circuit is turned on.

[0051] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0052] The schematic diagram of the overvoltage protection circuit of the converter sub-module provided by the embodiment of the present invention is as follows figure 1 As shown, the overvoltage protection circuit includes:

[0053] Sampling circuit 10, overvoltage detection circuit 11, circuit breaker excitation control ci...

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Abstract

The invention discloses an overvoltage protection circuit for a converter sub-module. The overvoltage protection circuit comprises a sampling circuit, an overvoltage detection circuit, a circuit breaker excitation control circuit and a circuit breaker. The invention further discloses an overvoltage protection method for the converter sub-module. According to the method, sampling is carried out on capacitive voltage of the converter sub-module through the sampling circuit so as to acquire sampling voltage, the overvoltage detection circuit is conducted when the sampling voltage exceeds a voltage threshold, the circuit breaker excitation control circuit is conducted when the overvoltage detection circuit is conducted, and the circuit breaker bypasses the converter sub-module.

Description

technical field [0001] The invention relates to the field of modularized multilevel converters in flexible power transmission, in particular to an overvoltage protection circuit and method for converter sub-modules. Background technique [0002] In the fields of flexible direct current transmission, flexible alternating current transmission and other fields, the sub-module power devices used have certain withstand voltage requirements, and the sub-modules will be damaged if the rated voltage of the power device exceeds a certain range. [0003] The existing conventional protection method is to connect the normally open contact of the circuit breaker in parallel on the AC side of the submodule. When the system detects that the capacitance of the submodule is overvoltage, it sends a trigger signal to close the normally open contact to bypass the submodule to ensure that the submodule The voltage no longer rises. The voltage detection circuit of the sub-module is generally an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/12
Inventor 陈永奎汪涛张茂强李乐乐
Owner NR ELECTRIC CO LTD
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