A sliding mode controller based STATCOM with battery storage for voltage and frequency stabilization in a micro-grid

Self excited induction generators are preferred to be one of the best machines for generation of electricity in remote and rural areas due to its capability of generating electricity without any external source. But on the other hand it is also a challenging task to maintain its voltage and frequency under load varying condition. In this paper we have considered a micro grid system with a Self excited induction generator and doubly fed induction generator as the source of generation connected by a transmission line. The Self excited induction generator is employed in a micro-hydro generation system where as the doubly fed induction generator is used for power conversion in a wind energy conversion system. A STATCOM with battery energy storage system is connected to the load bus acting as a compensator of active and reactive power, maintaining the voltage and frequency of system constant under different loading conditions such as linear load, nonlinear load and dynamic load. Sliding mode controller is used to control the STATCOM in a purpose to generate desired active and reactive power. The above system is modeled and simulated in MATLAB/SIMULINK and results are presented.