基于有功功率响应特性的光伏电站等值方法

In order to analyze the characteristics of large-scale grid-connected photovoltaic (PV) power plants more quickly and conveniently, an equivalent method based on active power response characteristics is proposed. The simulation model of a single PV unit is established, which considering recovery rate limit of the active power during fault recovery. And the corresponding transient response characteristics at the point of common coupling (PCC) are analyzed. According to the similarity of active power response curves under different solar irradiances, a clustering equivalent strategy of the PV power plants is proposed. The detailed and equivalent models of a PV power plant are established, respectively. Finally, the simulation results under irradiance disturbance and 3-phase short-circuit at PCC show that the active power, reactive power, voltage and current at PCC have good equivalent adequacies, thus verify the feasibility of the proposed equivalent method.