何晋伟 ,姬忠凯 ,韩俊飞 ,郭培健
AuthorsHTML:何晋伟 ¹ ，姬忠凯 ¹ ，韩俊飞 ² ，郭培健 ³
AuthorsListE:He Jinwei,Ji Zhongkai,Han Junfei,Guo Peijian
AuthorsHTMLE:He Jinwei¹，Ji Zhongkai¹，Han Junfei²，Guo Peijian³
Unit:1. 天津大学智能电网教育部重点实验室，天津 300072；
2. 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院，呼和浩特 010020；
3. 天津电气科学研究院有限公司，天津 300180

Unit_EngLish:1. Key Laboratory of Smart Grid of Ministry of Education，Tianjin University，Tianjin 300072，China；
2. Inner Mongolia Electric Power Research Institute of Inner Mongolia Power (Group) Co.，Ltd.， Hohhot 010020，China；
3. Tianjin Research Institute of Electric Science Co.，Ltd.，Tianjin 300180，China

Abstract_Chinese:可再生能源微电网存在着大量的分布式电源等电力电子装置和非线性负载，其相互影响使得谐波振荡等电 能质量问题日趋严重．另外，本地负荷谐波容易和分布式电源输出滤波器发生复杂的相互作用，若设计和实施不当 容易放大谐波．为了克服以上问题同时降低谐波补偿的成本，提出了一种基于加权电流无差拍控制的新型分布式电 源电能质量控制方法．首先，构建了虚拟输出滤波器系统的数学模型，将 LCL 滤波器的三阶系统降低为加权平均电 流相应的一阶虚拟电感滤波器．其次，为了满足谐波补偿对高带宽控制器的要求，以及电流快速跟踪响应的需求， 提出了加权平均电流的无差拍控制器算法，通过该方法增加有源阻尼，以抑制滤波器振荡．通过揭示加权平均电流 和并网点电流的内在关系，引入了一个谐波补偿项，该方法存在本地非线性负荷的情况下，不需额外增加电流传感 器和谐波电流提取环节，即可有效补偿本地负载谐波，降低并网电流的 THD 至 5%以下，显著改善并网点电能质 量．最后本文通过多个场景的 Matlab/Simulink 仿真验证结果，当负载跳变或参考给定电流突变时，并网电流超调小 并且快速跟踪响应，另外验证了当电网电压发生畸变时，并网电流不会受谐波电压的影响，以上仿真实验证实了该 方法的适应性和有效性．
Abstract_English:There are a large number of power electronics based on the distributed power generation and nonlinear loads in renewable energy microgrids. The interactions among the equipment make harmonic oscillation problems more serious. In addition，there is a complex interaction between the local load harmonics and distributed power output filters. Harmonics can easily be amplified if improperly designed and implemented. To overcome the abovementioned problems and reduce the cost of harmonic compensation，a novel power quality control method of distributed generation based on weighted current deadbeat control is proposed. First，this paper constructs a mathematical model of a virtual output filter system that can reduce the physical third-order LCL filter to a singlevirtual inductor filter. Second，to meet the high bandwidth requirement for harmonic compensation and fast current tracking response，a deadbeat control with a weighted average current is proposed，which uses active damping for filter oscillation mitigation. By revealing the relationship between the weighted average current and grid current，a harmonic compensation item is introduced. This method can effectively compensate local load harmonics and reduce the total harmonic distortion(THD) of the grid current to less than 5% without using additional sensors and harmonic current extractions. This can significantly improve the power quality of the grid. Finally，the effectiveness and practicality of the proposed method have been verified in different scenarios by Matlab/Simulink. When the load or the reference current changes suddenly，the grid current will be less overmodulated and will quickly track the response. In addition，it is verified that when the grid voltage is distorted，the grid current will not be affected by the harmonic voltage.
Keyword_Chinese:虚拟电感；无差拍控制；加权平均电流；有源阻尼；微电网
Keywords_English:virtual inductance；deadbeat control；weighted average current；active damping；microgrid

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