Grid-connected photovoltaic power station dynamic equivalent impedance and simulated analysis strategy

• Main Authors: JIN ENSHU, HUANG SONGTAO, HUA LIANGLIANG, ZHENG JIE, CAO ZHIGANG, WANG YANHUI, ZHANG JIAYU
• Format: Patent
• Language: Chinese; English
• Published: 16.02.2018
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention relates to the technical field of relay protection, and in particular to grid-connected photovoltaic power station dynamic equivalent impedance and a simulated analysis strategy. The strategy is characterized by comprising the following steps of: defining a dynamic equivalent impedance model according to a topological structure of a grid-connected photovoltaic power station; and comparing a simulation result with a practical photovoltaic power station experiment measured result through PSCAD/EMTDC modeling simulation and MATLAB data process, so as to verifying the correctness ofthe model and the dynamic equivalent impedance, wherein the error is lower than 6% which is an engineering tolerance limit so that the engineering application precision requirement can be satisfied. According to the modeling method, composition structures of photovoltaic power generation systems can be clearly reflected, and the dynamic equivalent impedance model is adapted to the volatility and intermittence of photovolt