大规模风电汇集系统电压不平衡机理、因素及影响规律

doi:10.19595/j.cnki.1000-6753.tces.211447

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摘要我国风电集中并网地区往往呈现电网结构薄弱、就地负荷小、当地缺乏无功支撑等特点,容易出现电压不平衡现象,严重时导致大量风机脱网,给电网的安全运行带来极大影响。为了分析风电汇集系统电压不平衡产生机理,首先,建立了计及网侧变流器（GSC）、机侧变流器（RSC）及锁相环（PLL）控制环节的双馈风力发电机（DFIG）的基频负序阻抗模型,并由单机模型推广至风电场集群基频负序阻抗模型;然后,基于实际风电汇集系统,构建风电汇集地区负序等效电路,剖析风电汇集地区电压不平衡机理,分析源、网侧主要因素对汇集母线电压不平衡的影响规律;最后,基于Matlab/Simulink仿真平台,验证机理分析及影响规律的正确性。

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	刘其辉
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	吴林林
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	徐曼

关键词 ：风电汇集系统, 电压不平衡, 基频负序阻抗建模, 产生机理, 影响因素

Abstract：The centralized integration of wind power in China often shows the characteristics of weak grid structure, small local loads, and lack of local reactive power support, which easily leads to voltage unbalance. In severe cases, a large number of wind turbines can be disconnected from the grid, which can greatly impact the safe operation of the power grid. In order to analyze the forming mechanism of voltage unbalance in large-scale wind power integration area, firstly, the fundamental frequency negative-sequence (FFNS) impedance model of doubly-fed induction generator (DFIG) including grid side converter (GSC), rotor side converter (RSC) and phase locked loop (PLL) is established. In addition, the single machine FFNS impedance model is extended to the wind power cluster; Secondly, taking one actual wind power integration area as the research target, the negative sequence equivalent circuit of the wind power integration system is constructed, the voltage unbalance mechanism of the wind power integration area is proposed, and the main influencing factors from both source side and grid side, together with their affecting rules are analyzed in detail. Finally, based on the MATLAB/Simulink simulation platform, the validity of the mechanism analysis and influence law is verified.

Key words： Wind power integration areas voltage unbalance fundamental frequency negative-sequence impedance forming mechanism influencing factors

收稿日期: 2021-09-13

PACS:	TM614
	TM712

基金资助:国家电网公司科技项目资助（4000-202014051A-0-0-00）

通讯作者: 逄思敏女,1998年生,硕士研究生,研究方向为双馈风电机组并网运行及控制。E-mail：476673746@qq.com

作者简介: 刘其辉男,1974年生,博士,副教授,研究方向为双馈风电机组并网运行及控制。E-mail：liuqihuifei@163.com

引用本文:

刘其辉, 逄思敏, 吴林林, 刘辉, 徐曼. 大规模风电汇集系统电压不平衡机理、因素及影响规律[J]. 电工技术学报, 2022, 37(21): 5435-5450. Liu Qihui, Pang Simin, Wu Linlin, Liu Hui, Xu Man. The Mechanism, Factors and Influence Rules of Voltage Imbalance in Wind Power Integration Areas. Transactions of China Electrotechnical Society, 2022, 37(21): 5435-5450.

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