Equivalent Model and Stability Enhancement Strategy for Distributed Photovoltaic Grid-Connected Systems Based on Coherency VSGs
In the new distribution system,numerous distributed photovoltaic systems are presented through direct parallel or indirect interconnection configurations.Virtual synchronous generator(VSG),as a typical grid connected distributed photovoltaic inverter,generates different dynamic responses when different control parameters and circuit parameters are combined during grid faults.Although existing research has mostly focused on the stability of individual VSGs,there is relatively little research on the comprehensive analysis and control strategies of multi VSG grid connected systems.Therefore,a method for identifying synchronous VSGs grid connected systems was proposed,and an equivalent single VSG model for synchronous VSGs grid connected systems was established.This model not only has clear physical meaning,but also accurately describes the dynamic characteristics of the original system.Based on this model,this paper further proposes a strategy to improve the transient performance of coherent VSGs grid connected systems.The simulation experiment results have verified the effectiveness of the proposed method,providing a new perspective and solution for the stability and performance optimization of multi VSG grid connected systems.
new power distribution systemmulti-distributed photovoltaic systemsvirtual synchronous generatorequivalent control structure
万方数据
维普
