Reduction of Harmonics in Microturbine Generation System

In today’s global power scenario Distributed Generation (DG) is playing an important role. DG can be obtained from many sources such as wind energy, tidal energy, solar energy, landfill and digester gases etc. In recent DG technologies microturbine generation is proven to be one of the simpler and environment friendly DG systems. DG systems are usually stand alone or they are interconnected to low and or medium voltage grid system. With increasing penetration of DG, it is necessary to analyse its performance and its impact on existing system. Modelling and simulation of DG systems helps in analysing their performance and impact on existing power distribution system. In this paper, a model of a microturbine generator system is developed in MATLLAB/Simulink using SimPowerSystems library. The simulink model is built from the mathematical model of each part of system with their interconnections. This simplified model is a useful tool for studying the various operational aspects of micro turbines. The performance of developed model is studied by connecting it to an isolated load. The interconnection of a microturbine generator to a load or distribution system is a critical part and it requires efficient power conditioning system. In this paper, AC/DC/AC power converter is used. Semiconductor power electronics devices such as rectifiers and inverters produce harmonics in the system. The harmonics injected by the microturbine generation system are reduced by using passive filter. The simulations of the microturbine generation system are carried out for resistive as well as inductive load. The output waveforms are presented in the paper.