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文章摘要
微电网孤岛模式下基于虚拟阻抗的负荷分配控制策略
An Control Strategy of Load Distribution Based on Output Virtual Impedance in an Autonomous Microgrid
Received:March 19, 2015  Revised:March 19, 2015
DOI:
中文关键词: 微电网  孤岛模式  虚拟阻抗  负荷分配  下垂增益
英文关键词: microgrid  islanded mode  load distribution  virtual impedance  droop gain
基金项目:
Author NameAffiliationE-mail
LIN yan Fujian Electric Power Research Institute 565173075@qq.com 
Cai Zhencai Fujian Electric Power Research Institute  
WU Dan-yue Fujian Electric Power Research Institute  
LIU Jian-hua* School of Electrical Engineering and Information, Sichuan University 565173075@qq.com 
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中文摘要:
      针对微电网孤岛模式下的多逆变器并联运行系统,其负荷分配性能对于系统的稳定、高效运行至关重要。通过深入分析多逆变器并联运行时的负荷分配机理,得到逆变器额定容量与总输出阻抗不匹配是造成负荷分配不准确的根本原因。在此基础上,提出了引入虚拟阻抗来实现逆变器额定容量与总输出阻抗相匹配的方法,以达到改善负荷分配性能的目的。同时,通过对下垂特性曲线的修正来减小虚拟阻抗对输出电压的影响。最后,在Matlab/Simulink仿真平台上验证了所提控制策略的有效性。
英文摘要:
      The performance of load distribution is critical for the stable and efficient in an autonomous microgrid with multi-inverter parallel system. Through in-depth analysis of the load distribution mechanism of multi-inverter parallel system, the conclusion that the mismatch of rated power with line impedance is the root cause of inaccurate distribution is got. On this basis, a method based on the introduction of virtual impedance is proposed to achieve the match of rated capacity of the inverter with the total output impedance, in order to achieve the purpose of improving the load distribution properties. At the same time, the droop characteristic curve is corrected to reduce the impact of virtual impedance on the output voltage. Finally, The effectiveness of the proposed control strategy is verified on the Matlab/Simulink simulation platform.
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