VSIG-variable speed integrated generating set for telecommunication application

This paper is focused on the industrial development of a novel type variable speed power generating system that can be used for the supply of electrical loads in the range 10 kVA to 100 kVA. Variable-speed-integrated-generating (VSIG) sets consist of a diesel engine, an axial type permanent magnet generator and high frequency power converter that is IGBT based. The axial type PMG has proved to be the best candidate for variable speed application. The power to weight ratio of the set is significantly more than traditional sets incorporating a wound field synchronous generator. Mechanical integration of the generator and engine must consider torque pulsation and axial thrust. The unique feature of the control system is the control algorithm which ensures fast response of the system to load application and accurate mapping of engine torque with load current.