Design and Implementation of Direct Power Control System for Brushless DC Generator in Standalone DC Applications

This paper investigates the design and implementation of direct power control (DPC) strategy for brushless DC (BLDC) generators. Since in conventional BLDC generator systems, electrical power is transferred to the DC-link through uncontrolled diode rectifiers, a great deal of energy may be lost. Moreover, in some applications where the shaft speed of the prime mover is variable, a constant DC-link voltage is essential in spite of the variations of speed and electrical load. To overcome these shortcomings, in this study, through the six-switch power converter, the output power of BLDC generator is controlled via DPC strategy for regulation or tracking of desired DC-link voltage or reference power. Special features of the proposed strategy are: ease of implementation, low cost, and fast response. The proposed control theory is verified by simulations and experiments in various scenarios.