A Power Circulating Suppression Method for Parallel Transient Inverters with Instantaneous Phase Angle Compensation

Shengxian Ji, Fei Xiao, Guisheng Jie (), Shan Gao and Jiamin Ye
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Shengxian Ji: National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, China
Fei Xiao: National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, China
Guisheng Jie: National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, China
Shan Gao: National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, China
Jiamin Ye: National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, China

Energies, 2024, vol. 17, issue 17, 1-16

Abstract: A unidirectional link is typically incorporated into the DC input side of an inverter to ensure the reliability and stability of the microgrid power supply. Due to impedance and control variations among inverters, circulating currents may rapidly arise during the operation of parallel transient inverters. Nonetheless, the unidirectional power circulating in a DC unidirectional link results in energy accumulation on the DC side, causing DC bus voltage pumping and affecting MGs’ operation safety and stability. This paper proposes a non-communication-based circulation suppression strategy to suppress power circulation in parallel transients based on the local information of inverters. First, a parallel transient is modeled, and the power circulation phenomenon and its influencing factors are analyzed. Then, the instantaneous power and absorbed active energy are calculated to adjust the phase of the inverter output voltage and suppress power circulation. Moreover, the output frequency is adjusted to balance the DC-side voltage of each inverter. Then, the stability of the parallel system after adding the circulation suppression control strategy is verified using the Lyapunov function method. Finally, simulation and experimental results verify the effectiveness of the proposed power circulation suppression strategy.

Keywords: microgrids; parallel transient; circulating suppression; Lyapunov function method (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: 2024
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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