Load balancing and voltage regulation for two leg VSC based islanded DG set supply system

This paper discusses the unit template control strategy for load balancing and voltage regulation of induction generator based DG (Diesel generator) set for islanded system. The proposed system consists of DG set along with DSTATCOM (Distributed Static Compensator) and BESS (Battery Energy Storage System) is used for load balancing along with harmonics elimination and reactive power compensation. An isolated T-T Connected transformer is used to reduce size of two-leg VSC and also neutral current compensation. The battery on two-leg VSC (Voltage Source Converter) of DSTATCOM with BESS is able to supply active power when the load requirement is more than rating of DG set and battery can store energy when load requirement is less than DG set rating. The reference sources for two-leg VSC are estimated using unit template control strategy and this algorithm has quick dynamic response. The proposed DG set system with DSTATCOM is modeled in MATLAB R2009a along with Simulink and results are verified under three phase linear/non-linear loads.