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An Improved Fixed Angle-off Control Method

A technology of determining the turn-off angle and control method, which is applied in the direction of power transmission AC network, etc., can solve the problems of ineffective suppression of commutation failure and no consideration, and achieve the effects of reducing the probability of occurrence, improving stability, and suppressing commutation failure

Active Publication Date: 2020-11-27
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

[0004] In view of this, the present invention proposes an improved fixed turn-off angle control method that effectively suppresses commutation failure, improves the ability to resist commutation failure, and solves the problem of DC current and commutation when transient operation is not considered in the prior art. The technical problem that the commutation process cannot be effectively suppressed due to the influence of large changes in electrical parameters such as voltage on the commutation process

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Embodiment Construction

[0027] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0028] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0029] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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Abstract

The invention discloses an improved fixed turn-off angle control method. The method is used for improving an existing fixed turn-off angle control mode on the basis of two aspects of a direct currentprediction function and a critical turn-off voltage time area. The method comprises the following steps: detecting a value of a direct current Id at a trigger angle alpha time delay T to obtain a direct current change rate, supposing that the Id changes at a constant rate, and taking the direct current change rate corresponding to a commutation starting time as a current change rate, namely dId / dt, in the whole commutation period; at the same time, considering the influence of commutation voltage change on the turn-off angle in the transient process, deducing an expression of an adjusted fixedturn-off angle control reference value gamma ref according to the condition that the turn-off voltage time area during transient operation should meet the critical turn-off area, and calculating thevalue of the required advance trigger angle alpha in combination with direct current prediction.

Description

technical field [0001] The present invention relates to the technical field of high-voltage direct current, and more specifically, relates to an improved constant-off angle control method. Background technique [0002] my country's high-energy reserve and power-heavy load areas present an extremely uneven distribution. The use of high-voltage direct current transmission systems with long-distance and large-capacity power transmission capabilities for large-scale cross-regional power transmission can effectively improve this problem. The high-voltage direct current transmission system is mainly composed of the converter station at the sending and receiving end and the direct current transmission line. The converter is the most important equipment in the converter station and is mainly responsible for the conversion of AC to DC. In the high-voltage DC control system, the control characteristics of the pole control directly determine the change trend of the firing angle command...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 王文王震夏添彭君哲李辉王煊博卢盼
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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