Integration Impact of DRE on the Voltage Stability of Power Network

The integration of distributed renewable energy (DRE) into grid is experiencing significant growth. Due to its intermittent characteristics, DRE have several impacts on system operation. This integration does not only influence the distribution network, but also it affects the transmission network. This paper analyzes the impact of increased penetration of distributed renewable energy specifically the PV generation on static voltage stability of transmission network and helps to find the maximum allowable capacity of DRE penetration. DRE integration with different weather conditions is studied in this paper. Voltage Collapse Proximity Index (VCPI) is used to evaluate the voltage stability of the system. Simulations are carried out on IEEE-39 bus test system using Power system analysis toolbox (PSAT). It can be concluded that the integration of high level of DRE into the grid affects the voltage stability, and it may lead to voltage collapse. The analysis results can be used to provide guidance for the allowable percentage of DRE integration.