| 引用本文: | 陈厚合,齐文博,姜涛,李国庆.提升海上风电经VSC-MTDC接入的低惯量系统频率稳定综合控制策略[J].电力自动化设备,2022,42(8): |
| CHEN Houhe,QI Wenbo,JIANG Tao,LI Guoqing.Integrated control strategy for improving frequency stability of low inertia system connecting to offshore wind power via VSC-MTDC[J].Electric Power Automation Equipment,2022,42(8): |
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| 摘要: |
| 规模化海上风电经多端柔性直流输电(VSC-MTDC)接入的低惯量系统存在同步发电机(SG)占比小、惯量水平低、功率互济能力弱等问题，为此提出一种VSC-MTDC与海上风电协调配合的低惯量系统频率稳定综合控制策略。首先将含原动机-调速环节的SG聚合为单机系统频率响应模型，构建换流站的虚拟系统频率响应(VSFR)控制器，并借助劳斯稳定判据分析经典参数下VSFR闭环控制的稳定性。然后针对海上风电并网系统功率支援能力不足导致的VSC-MTDC电压越限问题，设计适用于多风速场景的双馈风机附加桨距角与转速控制，通过调整海上风电出力对低惯量系统进行支援，提高海上风电并网系统功率互济能力，保障VSC-MTDC安全运行。最后在海上风电经三端柔性直流输电接入的低惯量系统中对所提控制策略进行分析验证。结果表明：所提控制策略的频率响应和功率支援能力强，可提高低惯量系统的频率稳定性。 |
| 关键词: 海上风电 多端柔性直流输电 低惯量系统 虚拟系统频率响应 功率支援 |
| DOI：10.16081/j.epae.202206003 |
| 分类号:TM614;TM761+.2 |
| 基金项目:国家自然科学基金资助项目(U2066208,52077028) |
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| Integrated control strategy for improving frequency stability of low inertia system connecting to offshore wind power via VSC-MTDC |
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CHEN Houhe, QI Wenbo, JIANG Tao, LI Guoqing
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Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin 132012, China
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| Abstract: |
| The low inertia power system connecting with large-scale offshore wind power via VSC-MTDC(Voltage Source Converter based Multi-Terminal high voltage Direct Current) system, has critical problems of few SG(Synchronous Generator),low inertia level and poor power support capability. To end this, an integrated frequency control strategy for the low inertia system considering the VSC-MTDC and offshore wind power cooperation is proposed. Firstly, the SG with the prime mover and governor is aggregated into a single-machine system frequency response model, and a VSFR(Virtual System Frequency Response) controller of the converter is constructed. The stability of VSFR closed-loop control with classical parameters is analyzed by the Routh stability Criterion. Then, an additional pitch angle and rotor speed control method of doubly fed induction generator for multi-wind speed conditions is designed to solve the problem of VSC-MTDC grid voltage violation caused by insufficient power support capacity of offshore wind power integrated system. The power mutual support capacity of the wind power integrated system is improved by adjusting the power output of offshore wind farms to support the low inertia system, which can ensure the secure operation of the VSC-MTDC. Finally, the performance of the proposed control strategy is analyzed and verified in a low inertia system connecting to offshore wind power via three-terminal DC grid. The results indicate that the proposed method can provide better capability of frequency response and power support, and can improve the frequency stability of the low inertia system. |
| Key words: offshore wind power VSC-MTDC low inertia system virtual system frequency response power support |
