Abstract
The mismatch between the feeder impedance of each parallel inverter connected to the public AC bus in the microgrid and its rated capacity will cause harmonic circulation in the system. In order to effectively suppress the harmonic circulating current and balance the power distribution among the inverter units, this paper introduces an adaptive virtual harmonic impedance controller in the harmonic domain to reshape the impedance of the system to match the feeder impedance, Dynamically adjust the harmonic current distribution, obtain the modulated wave through the measuring current and voltage double-loop control, and then drive the inverter to operate through the SPWM modulation circuit. MATLAB/Simulink simulation, the results show that the harmonic power distribution method based on virtual intelligent matching harmonic impedance raised in this paper can significantly suppress the harmonic circulating current between parallel inverter systems, and improve the quality of output voltage of parallel inverter systems. The accurate power distribution of the inverter is realized, and performance of inverter in parallel system with a nonlinear load is improved.
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