Method and system for realizing commutation of high-voltage direct-current transmission converter valve

A high-voltage direct current transmission and system realization technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as weak resistance, avoid failure, speed up commutation, and improve commutation reliability.

Pending Publication Date: 2021-01-08
SHANGHAI MUNICIPAL ELECTRIC POWER CO +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of weak resistance in the above-mentioned prior art, the present invention provides a method for implementing commutation of HVDC converter valves, including:

Method used

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  • Method and system for realizing commutation of high-voltage direct-current transmission converter valve
  • Method and system for realizing commutation of high-voltage direct-current transmission converter valve
  • Method and system for realizing commutation of high-voltage direct-current transmission converter valve

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Embodiment 1

[0050] Embodiment 1 of the present invention provides a method for implementing commutation of HVDC converter valves, the specific flow chart is as follows figure 1 As shown, the specific process is as follows:

[0051] S101: Determine the two phases that need to be commutated by the HVDC converter valve, specifically, determine the two phases that need to be commutated by the HVDC converter valve according to the AC voltage measurement of the HVDC converter valve;

[0052] S102: Trigger the thyristor module of the HVDC converter valve, and control the state of the controllable capacitor device on each phase between the HVDC converter valve and the converter transformer, so as to realize the phase commutation of the HVDC converter valve.

[0053] The phase commutation of the HVDC converter valve is realized by controlling the state of the controllable capacitor device, which is specifically divided into three situations: 1) The phase commutation of the HVDC converter valve fro...

Embodiment 2

[0068] Based on the same inventive concept, Embodiment 2 of the present invention also provides a system for implementing commutation of HVDC converter valves, such as Figure 6 as shown, Figure 6 Among them, T is the converter transformer, S is the three-phase AC power supply, Cap1 is the controllable capacitor device installed on the HVDC converter valve and converter transformer phase A, and Cap2 is the HVDC converter valve and converter transformer B phase The controllable capacitor device is set on the upper side, Cap3 is the controllable capacitor device on the HVDC converter valve and the C phase of the converter transformer, V1-V6 is the thyristor module on each bridge arm of the HVDC converter valve, v d is the DC side voltage of the HVDC converter valve.

[0069] The HVDC converter valve phase commutation implementation device provided in Embodiment 2 of the present invention includes a HVDC converter valve, a controllable capacitor device, and a converter transfor...

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Abstract

The invention provides a method and a system for realizing commutation of a high-voltage direct-current transmission converter valve. The method comprises the following steps: determining two phases needing commutation of the high-voltage direct-current transmission converter valve; triggerig a thyristor module of the high-voltage direct-current power transmission converter valve, and controllingthe state of a controllable capacitor device arranged on each phase between the high-voltage direct-current power transmission converter valve and a converter transformer, so that phase change of thehigh-voltage direct-current power transmission converter valve is achieved, the phase change time of the high-voltage direct-current power transmission converter valve is shortened through the controllable capacitor devices, the current change speed is increased, the commutation reliability is improved, and the commutation failure resistance of the high-voltage direct-current transmission converter valve in the commutation process is improved; in addition, according to the technical scheme provided by the invention, the controllable capacitor device is switched on only during commutation of the high-voltage direct-current transmission converter valve, and the controllable capacitor device is in a bypass state at a non-commutation moment, so that the thyristor on the thyristor module is prevented from losing efficacy due to remarkable increase of voltage stress, and the service life of the thyristor is prolonged.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a method and system for realizing phase commutation of a high-voltage direct current transmission converter valve. Background technique [0002] High voltage direct current (HVDC) is a high-power long-distance direct current transmission that uses stable direct current and has the advantages of no inductive reactance, capacitive reactance and no synchronization problems. The power transmission process is direct current, commonly used It is widely used in long-distance high-power transmission, submarine cable power transmission and asynchronous communication of AC system, etc. HVDC is constantly developing in the direction of larger transmission capacity, longer transmission distance, higher transmission voltage, more flexible transmission mode, lower transmission loss, and more compact converter station volume. HVDC includes converter valves, con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36H02J2003/365H02J2203/20Y02E40/30Y02E60/60
Inventor 周亮崔春艳高凯吴保义张俊张仕骐任茂鑫林曈鲍伟
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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