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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Mechanical and Electrical Engineering     
Redundant group control strategy for microgrid with multi-inverters
HU Ke yong, XU Fang, AI Qing lin, XU Hong wei, OU Yang jing
1. Key Laboratory of E＆M, Ministry of Education＆Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, China; 
2. Qianjiang College, Hangzhou Normal University, Hangzhou 310036, China
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Abstract  

Three layer control method was proposed in order to solve the problem of redundancy control of multiple inverters in microgrid system. The first one was the new improved droop control. Through the introduction of inductive virtual impedance, the output impedance of inverters were only determined by the filter inductance value and a double loop droop controller with excellent stability was designed. The second was synchronous control. The phase and voltage amplitude information at both sides of point of common coupling was used to give feedback synchronization regulation for the droop control based on the principle of synchronous grid-connected control which was a positive feedback of amplitude and frequency reference value. The third was compensation control， the compensation models of amplitude and frequency were designed Combined with the transfer function and droop control structure. in order to make up for the steady-state error in the process of droop. Results show that the control strategy can meet the reliable operation of microgrid, having good dynamic and steady performance. The strategy truly realizes the redundant group control of multi-inverters in microgrid.

Published: 01 August 2016
CLC:  TM 464  
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HU Ke yong, XU Fang, AI Qing lin, XU Hong wei, OU Yang jing. Redundant group control strategy for microgrid with multi-inverters. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(8): 1608-1617.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.08.025     OR     http://www.zjujournals.com/eng/Y2016/V50/I8/1608


面向多逆变器的微电网冗余群控策略

为了解决在微电网系统中多台逆变器的冗余群控的问题，提出3层式控制方法,第1层为新型改进的下垂控制，通过引入感性虚拟阻抗，使得逆变器等效输出阻抗仅由滤波电感决定，设计出稳定性优良的双环下垂控制器；第2层为同步控制，基于幅值和频率参考值正反馈的同步并网控制原理，采用公共连接点断路器两侧相位及电压幅值信息，对下垂控制进行反馈同步调节|第3层为补偿控制，结合补偿传递函数及下垂控制结构，设计出电压幅值与频率的补偿量模型，来弥补下垂过程中产生的稳态误差.结果表明，该控制策略可以满足微电网的可靠运行，具有良好的动态和稳态性能，真正实现了微电网中多台逆变器的冗余群控管理.

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