非线性负载下微电网主逆变器输出侧电能质量控制策略  

The Output Side Power Quality Control Strategy for Microgrid Main Inverter under Nonlinear Load

作　　者：涂春鸣[1] 杨义[1] 肖凡[1] 兰征[1] 李元涛 Tu Chunming;Yang Yi;Xiao Fan;Lan Zheng;Li Yuantao(National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),长沙410082

出　　处：《电工技术学报》2018年第11期2486-2495,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51577055)

摘　　要：针对微电网主逆变器输出侧电能质量易受其所连交流母线上非线性负载影响的问题,提出了一种适用于三相四线制微电网主逆变器的高电能质量控制策略。首先,分析了非线性负载造成主逆变器输出侧电压畸变的原因,得到了孤网运行状态下主逆变器输出侧电压谐波抑制机理。其次,解析了传统逆变器的谐波抑制方法及其物理机理,并指出了该类抑制方法的不足。然后,提出了一种基于虚拟谐波阻抗的新型谐波抑制策略,能同时适用于电流型谐波源和电压型谐波源,分析了该方法的可行性。最后,仿真结果和实验结论验证了该控制策略的有效性,该方法有效地改善了主逆变器输出电压的畸变率。Aiming at the problem that the power quality of the output side of the microgrid main inverter is susceptible to the nonlinear load connected to the AC bus, a high power quality control strategy for three-phase four-wire microgrid main inverter is proposed. Firstly, this paper analyzes the causes of the voltage distortion at the output side of the main inverter caused by the nonlinear load, the voltage harmonic suppression mechanism of main inverter is obtained under the operation of the isolated microgrid. Secondly, the harmonic suppression method of traditional inverter and its physical mechanism are analyzed, and the deficiency of the suppression method is pointed out. Then. a new harmonic suppression strategy based on virtual harmonic impedance is proposed, which can be applied to both the current harmonic source and the voltage harmonic source,and the feasibility of the method is analyzed. Finally, The simulation and experimental results verify the correctness and practicability of the proposed control strategy. The proposed method effectively improves the quality of the output voltage of the main inverter.

关 键 词：非线性负载 谐波抑制 高电能质量 虚拟谐波阻抗 

分 类 号：TM464[电气工程—电器]