Coordinated control for multi-WTGs wind-diesel hybrid power system based on disturbance observer

Abstract

Wind diesel hybrid system is an important new energy supply mode, but the output power of wind turbine generator (WTG) is fluctuated depending on weather conditions. Especially, the wind-diesel hybrid system with multiple WTGs for remote areas and islands operation, it will inevitably lead to the fluctuated output power to produce the large frequency deviation. So it’s crucial to coordinate the WTGs for providing high quality of electricity. Based on the designed disturbance observer, the coordination control strategy for the multi-WTGs wind-diesel hybrid system is proposed. The load variation is allocated to the WTGs output power reference by using the observer. Here, the constructed controller is compared with the traditional method for every WTG system with only PID control. The simulation results show that of frequency deviations are reduced and output power of every WTGs are controlled effectively.