LMI approach in Stability improvement through reactive power control in DG based hybrid power system

Abstract

Present research paper focuses reactive power management & voltage instability issues of a wind energy based dispersed power generating station. The iterative performances of PID controller as well as the robust H ∞ damping controller of the hybrid power system is designed through linear matrix inequalities (LMI) approach. The stability aspects of dispersed wind energy based HPS are considered for discussion where the issue of reactive power compensation is addressed by linear static var compensator (SVC) controller. The control aspects of SVC as well as the whole hybrid system are taken care by H ∞ linear matrix inequalities approach. The iterative LMI method has been implemented for tuning the gains of PID controller with H ∞ design by the help of iterative LMI. The wind-diesel hybrid system is also implemented experimentally where a proto type hardware model has been established by taking the help of dSPACE real time control environment. In this case dSPACE 1104 is added for data acquisition and control. Experimental results obtained during practical case analysis justify the simulation results of MATLAB. Adaptability and robustness of the proposed controllers are achieved under fluctuating loads and wind power uncertainty.