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Self-adaptive droop control method and system for converter station after large disturbance

A control method and technology of a converter station, which are applied in the power transmission AC network, parallel feeding arrangement of a single network, etc., can solve problems such as power fluctuation, achieve reasonable power distribution, and avoid the effect of voltage exceeding the limit.

Active Publication Date: 2020-06-02
CHINA ELECTRIC POWER RES INST +3
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there may be multiple converters employing the proposed adaptive voltage droop control strategy, which means that there may be multiple converters operating in constant voltage control mode, leading to power fluctuations in some cases

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  • Self-adaptive droop control method and system for converter station after large disturbance
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  • Self-adaptive droop control method and system for converter station after large disturbance

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Embodiment Construction

[0045] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0046] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a self-adaptive droop control method and system for a converter station after large disturbance, and belongs to the technical field of power systems and automation thereof. Themethod comprises the following steps: acquiring system parameters of a converter station of a multi-terminal flexible DC power transmission system, and determining conditions for adaptive droop control after large disturbance of the converter station according to the system parameters; when the converter station meets the condition of adaptive droop control after large disturbance, acquiring an adaptive droop control coefficient according to system parameters, and performing droop control on the converter station according to the adaptive droop control coefficient. According to the method, the droop coefficient can be adaptively adjusted, the problem of voltage out-of-limit under large disturbance of a traditional droop method is avoided, and meanwhile, reasonable power distribution can be realized.

Description

technical field [0001] The present invention relates to the technical field of electric power system and automation thereof, and more specifically, relates to a droop control method and system for self-adaptation after a large disturbance of a converter station. Background technique [0002] In the VSC-MTDC system, the DC voltage deviation is the most important factor to measure the performance of the DC system under large disturbances. For the voltage droop control strategy with a fixed droop coefficient, the method of determining the droop coefficient of the droop control converter usually depends on the capacity of the corresponding converter. However, when using this traditional method, the droop-controlled converter may cause load unbalance, and the DC voltage of the DC system may exceed the safe range. [0003] [0004] β=K u / K p (2) [0005] It can be seen from formula (1)(2) that when β is small, once the DC voltage deviation is large, the controller allows ...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/46
CPCH02J3/36H02J3/46Y02E60/60
Inventor 陈争光王一振王兴国杜丁香周泽昕李鹏郭雅蓉曹虹王书扬戴飞扬王晨清卢宇
Owner CHINA ELECTRIC POWER RES INST
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