Proceedings of the 2nd International Conference on Information Technologies and Electrical Engineering | 2019
Photovoltaic Inverter Cluster Resonance Suppression Strategy Based on Active Harmonic Conductance Method
Abstract
In order to suppress the resonance caused by the integration of photovoltaic inverter clusters into the grid, this paper proposes a photovoltaic inverter cluster resonance suppression strategy based on active harmonic conductance method. Firstly, based on the inner loop of the capacitor current under the PI controller and the double closed loop control of the outer loop of the grid current, the resonance suppression effect of the single inverter under the double closed loop control is analyzed. Then, while keeping the control system unchanged, the active filter conductance is added to the photovoltaic grid-connected system for multiple inverter resonance problems, which not only effectively suppresses the inverter low-frequency harmonic current from flowing into the grid-side system, but also improves The inverter is resistant to disturbances, thereby suppressing resonance problems caused by inverter clusters. Finally, the photovoltaic inverter cluster resonance energy is effectively suppressed by Matlab/Simulink software.