面向集电系统电压调节的风电场无功电压控制策略

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摘要风能时空分布的差异性导致风电机组运行状态具有分散性,降低了风电场联网运行的安全性。本文提出了一种通过调控风电机组无功输出以改善机组端电压分布的均衡性、进而改善集电系统电压水平的风电场无功电压控制策略,其中各机组无功参考功率是根据电网无功指令,利用集电系统拓扑结构特点,基于网络分析非迭代计算求得。仿真结果表明,所提出控制策略能够改善风电场并网点电压水平,并且机组端电压水平基本一致,增强了风电机组抵御电网电压扰动的能力,提高了风电场联网运行的安全性。

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关键词 ：风电机组, 集电系统, 并网点电压, 无功控制, 电压差异, 无功储备

Abstract：Temporal and spatial distribution of wind energy induces the dispersion of operation status of wind generators, which reduces the operation security of wind turbines. In the paper, a new voltage control strategy is presented, which regulates the reactive power output of wind generators to improve the voltage profile of collector system. The reference reactive power of wind turbines is obtained by non-iterative calculation method, based on the characteristics of the collector system topology. The simulation results show that the proposed control strategy could improve the voltage profile of wind farm and reduce the terminal voltage level diversion of wind generators. The ability of wind generators to withstand the grid voltage disturbance is enhanced and the operation security of wind farm is improved.

Key words： Wind turbines collector system voltage of the point of connection reactive power control voltage different reactive power reserve

收稿日期: 2014-05-05 出版日期: 2015-10-20

PACS:

TM614

基金资助:国家自然科学基金重点资助项目（60934005）和国家重点基础研究发展计划（973计划）（2013CB228201）资助项目

作者简介: 严干贵男,1971年生,教授,博士生导师,主要从事风力发电运行分析与控制、电力电子技术等方面的教学与研究工作。孙兆键男,1988年生,硕士研究生,研究方向为风电并网运行与控制。

引用本文:

严干贵, 孙兆键, 穆, 钢, 郑太一. 面向集电系统电压调节的风电场无功电压控制策略[J]. 电工技术学报, 2015, 30(18): 140-146. Yan Gangui, Sun Zhaojian, Mu Gang, Zheng Taiyi. Collector System Voltage Regulation Oriented Reactive Power Control Strategy for Wind Farm. Transactions of China Electrotechnical Society, 2015, 30(18): 140-146.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I18/140

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