一种提升交直流混合微电网动态特性的综合惯量控制方法

doi:10.19595/j.cnki.1000-6753.tces.181573

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摘要针对交直流混合微电网功率平衡及惯性低的问题,考虑风机、储能惯性支撑能力,提出一种交直流混合微电网综合惯量控制方法。首先,基于交直流混合微电网拓扑结构,简要分析综合惯量控制原则。其次,详细推导混合微电网中风机、储能可提供惯性输出功率的表达式,提出风储联合惯量控制策略。针对混合微电网功率平衡问题,利用交流频率与直流电压之间耦合关系,推导出互联变换器惯性传输功率表达式。最后,建立交直流混合微电网仿真模型,验证了所提综合惯量控制策略的有效性。结果表明,所提控制策略可充分利用储能大惯量特性,联合风机参与调频调压,为系统提供惯性支撑。该策略维持混合微电网功率平衡的同时保证了两侧子网的电能质量,实现了混合微电网的动态性能提升。

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	施静容
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关键词 ：交直流混合微电网, 惯性控制, 互联变换器, 风储联合系统

Abstract：Hybrid AC-DC microgrid has the problems of power balance and low inertia, thus this paper proposes a comprehensive inertia control method considering the inertial support capability of wind turbine generator (WTG) and energy storage (ES). Firstly, based on the configuration of hybrid AC-DC microgrid, the comprehensive inertia control principle is briefly analyzed. Secondly, the expression of the inertia power provided by WTG and ES in the hybrid microgrid is deduced in detail, and the WTG-ES combined inertia control strategy is proposed. Regarding the power balance in hybrid microgrid, based on the coupling relationship between the AC frequency and DC voltage, the expression of inertial transmission power of interconnecting converter is derived. Finally, a hybrid AC-DC microgrid model is built in Matlab/Simulink to verify the proposed comprehensive inertia control strategy. The simulation results show that the proposed control strategy can make full use of the large inertia characteristics, and participates in the frequency and voltage regulation with WTG to provide inertial support for the system. This strategy can maintain the power balance in hybrid microgrid while ensuring the power quality at both sides, which improves the dynamic performance the hybrid microgrid.

Key words： Hybrid AC-DC microgrid inertia control interconnecting converter wind turbine generator and energy storage combined system

收稿日期: 2018-10-08 出版日期: 2020-01-17

PACS:

TM712

基金资助:国家自然科学基金项目（51822702）和长沙市杰出青年创新项目（KQ1707003）资助

通讯作者: 李勇男,1982年生,教授,博士生导师,主要研究方向为电力系统运行与控制、电力电子系统与控制。E-mail: yongli@hnu.edu.cn

作者简介: 施静容女,1993年生,硕士研究生,研究方向为交直流混合微电网的运行与控制。E-mail: jrshi@hnu.edu.cn

引用本文:

施静容, 李勇, 贺悝, 王姿雅, 焦世青. 一种提升交直流混合微电网动态特性的综合惯量控制方法[J]. 电工技术学报, 2020, 35(2): 337-345. Shi Jingrong, Li Yong, He Li, Wang Ziya, Jiao Shiqing. A Comprehensive Inertia Control Method for Improving the Dynamic Characteristics of Hybrid AC-DC Microgrid. Transactions of China Electrotechnical Society, 2020, 35(2): 337-345.

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