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A Novel Compact dq-Reference Frame Model for Inverter-Based Microgrids
Open AccessArticle

Modeling and Stability Analysis of Parallel Inverters in Island Microgrid

Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, College of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
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Electronics 2020, 9(3), 463; https://doi.org/10.3390/electronics9030463
Received: 10 February 2020 / Revised: 3 March 2020 / Accepted: 7 March 2020 / Published: 10 March 2020
The island microgrid is composed of a large number of inverters and various types of power equipment, and the interaction between inverters with different control methods may cause system instability, which will cause the power equipment to malfunction. Therefore, effective methods for analyzing the stability of the microgrid system have become particularly important. Generally, impedance modeling methods are used to analyze the stability of power electronic converter systems. In this paper, the impedance models of a PQ-controlled inverter and droop-controlled inverter are established in d-q frame. In view of the difference of output characteristics between the two control methods, the island microgrid is equivalent to a double closed-loop system. The impedance model of the parallel system is derived and the open loop transfer function of the system is extracted. Based on the generalized Nyquist criterion (GNC), the stability of parallel system working in island microgrid mode is analyzed using this proposed impedance model. The simulation and experiment results are presented to verify the analysis. View Full-Text
Keywords: island microgrid; impedance model; stability analysis island microgrid; impedance model; stability analysis
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Wang, X.; Qing, H.; Huang, P.; Zhang, C. Modeling and Stability Analysis of Parallel Inverters in Island Microgrid. Electronics 2020, 9, 463.

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