Shengqing Li
ABSTRACT
In order to suppress the resonance of photovoltaic inverter cluster system connected to the grid, an adaptive control method of active dampers is proposed to suppress the resonance. The resonance mechanism of photovoltaic inverter cluster is analyzed by modal analysis, and the virtual conductivity is introduced into the common bus to increase the damping of the system through active dampers, so as to suppress the harmonic resonance of photovoltaic inverter cluster. The virtual conductivity value can be adjusted adaptively according to the harmonic voltage content, and the cluster harmonic resonance of photovoltaic inverter can be suppressed with lower capacity, thus reducing the costs. MATLAB / simulink simulation results show that the proposed adaptive control method for active dampers is correct and effective.
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