A Novel Hierarchical Control Strategy for Low-Voltage Islanded Microgrids Based on the Concept of Cyber Physical System

Qiuxia Yang, Dongmei Yuan, Xiaoqiang Guo, Bo Zhang and Cheng Zhi
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Qiuxia Yang: Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
Dongmei Yuan: Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
Xiaoqiang Guo: Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
Bo Zhang: Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
Cheng Zhi: Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China

Energies, 2018, vol. 11, issue 7, 1-24

Abstract: Based on the concept of cyber physical system (CPS), a novel hierarchical control strategy for islanded microgrids is proposed in this paper. The control structure consists of physical and cyber layers. It’s used to improve the control effect on the output voltages and frequency by droop control of distributed energy resources (DERs), share the reactive power among DERs more reasonably and solve the problem of circumfluence in microgrids. The specific designs are as follows: to improve the control effect on voltages and frequency of DERs, an event-trigger mechanism is designed in the physical layer. When the trigger conditions in the mechanism aren’t met, only the droop control (i.e., primary control) is used in the controlled system. Otherwise, a virtual leader-following consensus control method is used in the cyber layer to accomplish the secondary control on DERs; to share the reactive power reasonably, a method of double virtual impedance is designed in the physical layer to adjust the output reactive power of DERs; to suppress circumfluence, a method combined with consensus control without leader and sliding mode control (SMC) is used in the cyber layer. Finally, the effectiveness of the proposed hierarchical control strategy is confirmed by simulation results.

Keywords: cyber physical system; islanded microgrid; secondary control; reactive power sharing; circumfluence (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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