A control strategy of a stand alone induction generator coupled with a diesel engine for distributed generation with renewable sources

The paper presents a new control strategy for an induction generator coupled with a power reactive compensator. The test system consists of a diesel engine, an induction generator, an inverter and a variable load (three-phase and single-phase loads). The paper focuses on the composite control of the inverter dc-link and prime mover in order to improve the dynamic assessment of the induction generator. The control strategy is based upon the decoupling of the regulating actions, this allowing to conceive a control structure quite similar to the classical active and reactive modulations of electrical power systems. The inverter frequency is opportunely changed to improve the dynamic behavior of the whole system. The control acts on the torque of the diesel engine and on the instantaneous frequency of the inverter. The results of numerical simulation confirm the goodness of the proposed control.