考虑机网动态交互作用的光伏场群等值建模

光伏场群等值建模是研究新能源电力系统动态特性的基础。提出了综合考虑光伏电源自身动态以及机网动态交互作用的光伏场群等值建模策略。基于电力系统微分代数方程，讨论了光伏电源与电力系统间的动态交互作用，强调了光伏场站端口电压是机网交互的关键因素。仿真分析了不同电压跌落程度下光伏电源的动态，指出变流器控制策略是影响光伏电源自身动态的主导因素。基于此，进一步提出了考虑机网交互作用的光伏场群动态分群方法及建模流程。最后通过仿真算例表明，与现有仅基于光伏电源自身动态的分群方法相比，进一步考虑机网交互作用可显著提高光伏场群的等值建模精度。

Equivalent modeling of PV station groups considering dynamic interaction between PV and power grid

Equivalent modeling of photovoltaic(PV) station groups is the basis for studying the dynamic characteristics of new energy power system. An equivalent modeling strategy for PV station groups that comprehensively considers the PV power source dynamic behavior and the dynamic interaction between PV power source and power system is proposed. Based on the differential algebraic equations of power system, the dynamic interaction between PV power source and power system is discussed, and it is emphasized that the terminal voltage of PV station is the key factor of the interaction between PV power source and power system. The dynamics of PV power source under different voltage dip degrees are simulated, which shows that the converter control strategy is the main factor that affects the PV dynamic behavior. Based on this, the dynamic grouping method and modeling procedure of PV station groups considering the interaction between PV power source and power system are proposed. Finally, a simulation example shows that compared with the existing dynamic grouping method based only on the PV dynamic behavior, further considering the interaction between PV power source and power system can significantly improve the equivalence modeling accuracy of PV station groups.