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Predictive type fixed turn-off angle control method

A control method and a technology for determining the turn-off angle, which are applied in the direction of output power conversion devices, electrical components, and power transmission AC networks, and can solve problems such as the adverse effects of control response speed and accuracy during fault transients and quasi-steady states , to achieve the effect of improving the ability to resist commutation failure

Active Publication Date: 2018-11-13
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the actual DC project, the predictive constant turn-off angle control is based on the ideal no-load DC voltage and DC current command value to calculate the firing angle. This calculation method will affect the response of the fault transient and quasi-steady control speed and accuracy are adversely affected

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Embodiment Construction

[0053] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0055]The 12-...

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Abstract

The invention discloses a predictive type fixed turn-off angle control method. By analyzing an inverter commutation process, a calculation formula of a turn-off angle of a DC (direct current) currentchange during the commutation period is obtained; amplitude and phase changes of each AC (alternating current) commutation voltage are considered; a DC current measured value and an AC voltage are respectively processed by a moving average filter and a second-order generalized integrator, and are used for solving a trigger angle of each converter valve; and the minimum trigger angle is taken as the output of the control of the fixed turn-off angle. By adopting the control method, the capacity of a system to withstand commutation failure can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current, in particular to a predictive control method with fixed turn-off angle. Background technique [0002] In the high-voltage DC control system, the control characteristics of the pole control directly determine the change trend of the firing angle command of the converter, and have a very important impact on the transient response characteristics of the DC system. Fixed turn-off angle control is one of the main control methods on the inverter side. Its control purpose is to reduce the reactive power consumption of the converter as much as possible while maintaining the turn-off angle not less than the reference value of the turn-off angle to ensure the normal operation of the converter valve. off. Therefore, the transient response performance of fixed turn-off angle control will greatly affect the ability of the converter to resist commutation failure. [0003] Commutation fail...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M1/06H02M7/521
CPCH02J3/36H02M1/06H02M7/521Y02E60/60
Inventor 汪娟娟傅闯王子民黄梦华李欢李战鹰李子林龚英明黄星海
Owner SOUTH CHINA UNIV OF TECH