A new integrated controller based 100 kVA mobile engine generator for single/three phase distribution line backup

A new integrated controller based mobile engine generator is presented to back up not only three-phase but also a single-phase distribution line. The conventional three phase engine generators for emergency power back up consist of diesel engine, generator and controller and usually back up three-phase power only. In the proposed engine generator, a generator conditioner is included to compensate phase current unbalance, which allows backup of a single-phase line. In addition, an AVR (auto voltage regulator) controller and a governor controller and a generator conditioner controller are integrated with single DSP (digital signal processor) control board to reduce cost and increase reliability. The generator conditioner shapes the generator currents sinusoidally in phase with generator voltages for any kind of load. The generator can be synchronized with the distribution power line and released without any power interruption or voltage spike since the load current is gradually changed from the distribution line to the generator, or vice versa. A 100 kVA engine-generator system is equipped on a 3.5 ton truck and the integrated controller is realized with TMS320C32PCMA. Experimental results for single and three-phase power back up at several load conditions are presented to verify the performance of the proposed mobile generator system.