An Improved Droop Control Method for Voltage-Source Inverter Parallel Systems Considering Line Impedance Differences

Junjie Ma, Xudong Wang, Jinfeng Liu and Hanying Gao
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Junjie Ma: College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150080, China
Xudong Wang: College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150080, China
Jinfeng Liu: College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150080, China
Hanying Gao: College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150080, China

Energies, 2019, vol. 12, issue 6, 1-17

Abstract: In this paper, the effect of the line impedance difference between various inverters on power sharing with the traditional droop control method is fully analyzed. It reveals that the line impedance difference causes a significant reactive power error. An improved droop control method to eliminate the reactive power errors caused by the line impedance errors is proposed. In the proposed method, a voltage compensation determined by the actual reactive power error between the local inverter and the average one is added into the local voltage reference based on the CAN communication. Even when the communication is interrupted, the controller will operate with the last value of the average power, which still outperforms the traditional method. The effectiveness of the proposed control method is verified by simulation and experimental results, which show the proposed method possesses the better power sharing performance and dynamic response.

Keywords: droop control; line impedance; power sharing; voltage compensation (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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