Design of the control circuit used in variable speed diesel generator set
The advanced circuit design of boost and inverter has created much interest in generator of variable speed diesel generating sets. The boost circuit and the topological structure of the three-phase half-bridge inverter were analyzed. The control strategy of Sinusoidal PWM (SPWM) was implemented. To reduce the noise in the control feedback, a low pass filter was in used. At the end of this paper, the authors performed a series of experiments to confirm the stability of the generator set. The experiment results verified that the boost circuit and the inverter designed in this paper are reasonable and can satisfy all the requirements of the diesel generator set.
Dynamic Behavior of Mobile Generator Set with Variable Speed and Diesel Engine
The engine-generator dynamics at a sudden load change (from low load to high load) remains a challenge in case of variable speed diesel generator. The dynamic behavior analysis presented here proves that the introduction of an energy storage element into the EGS with variable-engine-speed concept eliminates this drawback. This paper addresses the identification of the dynamic behaviour of such variable-speed EGS systems and the problems encountered during a sudden increase of load (power and voltage drops).
Gen-sets
This article describes a proof-of-concept development for a 7.5 kW gen-set in a family of military gen-sets in the 5 to 60 kW range. Several power electronic converters have been implemented in the design of this proof-of-concept gen-set that is lighter, smaller, and more fuel efficient than conventional fixed-speed gen-sets. The unit also has the flexibility of several selectable voltage and frequency options that greatly reduces the inventory logistics burden for a family of different unit types and sizes. With integrated controls and power electronics, the gen-set is able to run at its most efficient condition to minimize fuel consumption. It would also be possible to control the gen-set such that it ran at other different optimized conditions such as: maximum headroom for supplying load transients; most audibly quiet; and least polluting for certain emissions.