Novel Energy Management System of PMSG based Standalone Wind Power Generation System

Abstract

Renewable energy sources based electric power generating units are often power supply units for many rural areas worldwide especially where power supply is impossible through the power grid. Permanent Magnet Synchronous Generation (PMSG) based wind power conversion system is considered in this paper and equipped with an efficient maximum power tracker (MPPT) circuit. However, electricity produced through wind turbine will be always fluctuating according to wind speed. Hence, an energy storage device (i.e., batteries) is also connected through a dc to dc bidirectional circuit. Moreover, during light load conditions, a dump load also incorporated to consume excess power in case batteries are fully charged. A common dc-link is established by connecting MPPT circuit of wind system, bidirectional converter and dump load along with a power electronic switch. Novel control methods are proposed to all converters to maintain constant voltage at dc-link under various changes happened in the standalone system. In order to provide supply to AC loads, an inverter with voltage control unit also connected between load bus and dc-link. An efferent energy management algorithm is developed based on controlling the voltage at dc-link. MATLAB/Simulink is used to analyze the standalone power supply system and applied various operating conditions to present results.