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Abstract
To analyze the resonance mechanism of a photovoltaic (PV) power plant, a simplified impedance model of the PV power plant is first established. The structure of the PV power plant is then introduced, and the reason for the resonance is obtained by analyzing the on-site situation and measured data of the PV power plant. Finally, a simple and effective solution is proposed based on the structure of the PV power plant and its existing facilities. The results of the engineering experiments and the stable operation of the PV power plant verify the effectiveness of the proposed method.
Highlights
To analyze the resonance mechanism of a photovoltaic (PV) power plant, a simplified impedance model of the PV power plant is first established
The interconnection of large-capacity PV plants has brought about challenges to the stable operation of the power grid, and has become an important topic in renewable energy research [5,6,7,8,9]
After establishing the impedance model of grid-connected inverters and the power grid, the impedance stability criterion is used to analyze the stability of the system
Summary
With technological improvements in renewable energy generation, PV plants are gradually developing toward a larger scale [1,2,3,4]. The control system modeling analysis takes the coupling relationship between several links in the controller into consideration This type of analysis usually considers the stability of a grid-connected system under multiple working conditions using stability methods such as root locus, time or frequency domain analysis. Some scholars have proposed an analysis method based on the impedance stability This method aims to study the stability of the interaction between the grid-connected inverter and the power grid. After establishing the impedance model of grid-connected inverters and the power grid, the impedance stability criterion is used to analyze the stability of the system. The equivalent simplified model of a large-scale PV grid-connected system is established and the factors causing the system instability are revealed based on the impedance stability criterion. The results of engineering experiments and the stable operation of photovoltaic power plants demonstrate the effectiveness of the proposed method
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