A dc-bus voltage regulation for parallel wind-based synchronous generators

In this paper, a performance analysis of a dc-bus voltage regulation technique for parallel wind-based synchronous generators is presented. This technique is developed based on the voltage oriented control (VOC) algorithm for PWM converters. The proposed technique provides economic utilization of the wind generator by insuring unity power factor operation under different possible conditions. This is achieved using a PWM-based controlled rectifier (converter). Furthermore, this gives the ability to interconnect multi wind converter units sharing one dc-bus and the ability to compensate voltage disturbance due to loading effect on the dc-bus. Simulation results for different disturbance conditions are carried out to validate this proposed control algorithm. The developed technique is also implemented in a laboratory setup which includes two synchronous generators (250 W, 2.2 kW), each driven by a variable speed prime mover (VSPM) to emulate a wind turbine behavior, two 3-phase PWM based converters, three-phase line inductors connected between wind generators and converters, variable resistive DC-load, and a digital signal processor (DSP TMS320F240). The experimental results confirm the validity of the presented technique.