Abstract
The parallel connected inverter system achieves the power sharing through active power-frequency (P-f) and reactive power-amplitude (Q-U) droop control methods. Due to the use of fixed droop parameters, there is a conflict between the accuracy of the output voltage and the effect of power sharing. Moreover, sudden changes in the load can cause oscillations in the output current, which will affect the stable operation of the system. In order to solve the problem of frequency distortion and output voltage drop in the traditional droop control method, this paper proposes an improved droop control method. The new droop control equation introduces dynamic differential terms, power quadratic terms, and voltage peak feedback. The improved droop control method timely reflects the change trend of the power and makes the droop coefficient adaptively adjust with the power change, which effectively improves the system's stable operation performance and dynamic response capability. The experimental results verify the effectiveness of the improved droop control method.
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