基于下垂控制的逆变器无线并联与环流抑制技术

doi:10.19595/j.cnki.1000-6753.tces.161240

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Abstract The power transmission and circulating current characteristics of a parallel-inverter system are firstly analyzed in this paper. It reveals that the difference of the line impedance and the deviation of the output voltages between two parallel units both have significant effects on the power sharing accuracy of reactive power under the condition of the inductive line impedance. An adaptive virtual impedance method is proposed to reduce the difference of the equivalent connection impedance of the parallel system to some extent, andthe power sharing accuracy will be obviously improved by keeping the equivalent connection line impedance inductive. Additionally, an improved droop control strategy, which forms the equivalent droop control curve like a parabolic shape, is further put forward by using the feedback of AC bus voltage, realizing the trade-off between power sharing accuracy and output voltage sag effectively. With the proposed control strategy, the current circulation can be drastically suppressed and the system overall performance is greatly improved. Finally, the validity of the theoretical analysis and the proposed strategy is proved by simulation and experimental results.

Key words： Droop control virtual impedance prower sharing circulating current

Received: 08 August 2016 Published: 12 April 2018

PACS:

TM464

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161240 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I7/1450

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