Modeling and equivalent description of microturbine generation system

Distributed generation resources are widely connected to the distribution network, which has great influences on synthesis load characteristics. In order to study the composite load modeling of distribution network with microturbine generation (MTG) system, the models of each function module and its control strategy were expounded. A complete MTG system had been developed and set up in the Matlab/Simulink environment and its operating characteristics had been analyzed through the simulation. The results show that MT generating system can not guarantee constant power output when external voltage disturbance occurs, and the dynamic characteristics can´t be ignored. The analysis of the dynamic performance of an MTG system in transient shows that the MTG system can be considered as a generalized dynamic load that consumes negative power. Then a third-order differential state equation was proposed to describe the dynamic characteristics of the MTG system. The self-description ability, parametric stability and generalization ability of this description model were validated by comparison of simulations under different disturbance levels. This paper lays the foundation for synthesis load modeling of distribution network considering MTG system.