Power controller for PMG-based WECSs with battery storage systems

Abstract

This paper presents the development and performance evaluation of a new controller for permanent magnet generator (PMG)-based wind energy conversion systems (WECSs) that are equipped with battery storage units. The proposed controller is developed to ensure the voltage and frequency stability under changes in the grid demands for active and reactive powers, and under under variations in the wind speed. This objective can be met by adjusting the command active and reactive powers for all controllers operating power electronic converters in the PMG-based WECS and the battery storage units. The developed power based controller has been implemented for performance evaluation on interconnected PMG-based WECSs with battery storage units. The performance evaluation is carried out changes changes in the active and reactive power demands of the host grid, as well as changes in the wind speed. Performance evaluation results show that the power based controller is capable of initiating accurate, reliable, and fast adjustments in the command active and reactive powers to operate all PECs, and maintain the voltage and frequency stability. These performance features are impacted by the changes in grid power demands and/or wind speed.