Abstract
Photovoltaic cluster power generation can improve the power generation efficiency of photovoltaic power plants, but the photovoltaic cluster inverter will produce resonance after the grid, affecting the safe and stable operation of power systems. In order to ensure the reliability of power supply, the resonant generation mechanism of photovoltaic cluster system is studied in this paper, and the resonant characteristics are analyzed, the control strategy of RC-type global resonance suppression and Thyristor Switching RC (TSRC) circuit are proposed, to suppress the resonance of the photovoltaic cluster system. The effectiveness of the control method is verified through simulation and experiment. The experimental results show that the resonance can be effectively suppressed, and the photovoltaic cluster system can be safely and stably connected to the power grid to ensure the reliability of power supply.
Highlights
Photovoltaic power generation system usually adopts the mode that multiple inverters operate in parallel to conduct grid connection [1], so as to ensure the power generation efficiency of the photovoltaic power station
The photovoltaic cluster inverter system is composed of a number of photovoltaic grid-connected systems connected in parallel, and the output current of multiple inverters will flow into the power grid after the convergence of Point of Common Coupling (PCC) [5,6,7]
Photovoltaic cluster inverter grid-connected can improve the efficiency of photovoltaic power plants, but it is difficult to effectively suppress the resonance generated by the inverter cluster grid-connected
Summary
Photovoltaic power generation system usually adopts the mode that multiple inverters operate in parallel to conduct grid connection [1], so as to ensure the power generation efficiency of the photovoltaic power station. The harmonic current of the inverter is suppressed by paralleling conductance on each inverter to suppress the system resonance. In [4], proposing a virtual complex impedance method to suppress the impact of system circulating currents and high-frequency resonance among parallel inverters, and an experimental verification was carried out. This method is effective, it is necessary to change the structure of each inverter in the grid-connected inverter cluster system. The model of the grid-connected system of the photovoltaic cluster is built, and the effect of the resonance suppression is verified through simulation and experiment
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