一种储能改善低电压穿越期间风电场注入电流特性的致稳策略

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摘要风电场根据并网导则在低电压穿越期间向系统注入无功电流可能引起风电系统失稳,导致风电场低电压穿越失败。针对该问题,建立了该运行工况下含有锁相环环节的风电系统状态空间模型,有效揭示了系统失稳的原因,提出了利用储能装置改善风电场注入电流特性进而维持系统稳定的措施。仿真结果表明：所提风电系统低电压运行工况下的状态方程能够有效地描述系统的小扰动稳定特性;储能装置通过合理注入有功电流改善了风电场注入电流特性,有效提高了风电场低电压情况下的系统稳定性。

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	刘巨
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关键词 ：低电压穿越, 储能, 锁相环, 注入电流, 频率

Abstract：According to the grid codes, wind farms must inject reactive power current into power grid during the low voltage ride-through (LVRT) process. This would lead to instability of the wind power system and the LVRT failure of wind farm. A state space model of wind power system including the phase locked loop at the low voltage state was established in this paper, to analyze the instability phenomenon. Then the reasons of the instability phenomenon were well revealed. Finally, a stability control strategy was proposed to improve the stability of the wind power system by utilizing the energy storage system. Simulation results show that the state model of the wind power system at low voltage state can represent the small disturbance stability characteristic of the system. The energy storage system could effectively improve the injection current feature of wind power system and accordingly improve the system stability.

Key words： Low voltage ride-through energy storage phase locked loop injection current frequency

收稿日期: 2015-12-18 出版日期: 2016-07-28

PACS:

TM71

基金资助:国家重点基础研究发展计划（973计划）（2012CB215106）和国家自然科学基金（51577075）资助项目

作者简介: 刘巨男,1988年生,博士研究生,研究方向为大电网大机组安全稳定与控制、储能与新能源并网。E-mail: liu1988wo@126.com

引用本文:

刘巨, 姚伟, 侯云鹤, 文劲宇, 陈霞. 一种储能改善低电压穿越期间风电场注入电流特性的致稳策略[J]. 电工技术学报, 2016, 31(14): 93-103. Liu Ju, Yao Wei, Hou Yunhe, Wen Jinyu, Chen Xia. Stability Control for Improving the Characteristic of Wind Farm Injection Current During Low Voltage Ride-Through Using Energy Storage System. Transactions of China Electrotechnical Society, 2016, 31(14): 93-103.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I14/93

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