A hybrid adaptive-bacterial-foraging and feedback linearization scheme based D-STATCOM

This paper investigates application of a multivariable control technique to the multi-input multi-output (MIMO) nonlinear model of a distribution static synchronous compensator (D-STATCOM). The proposed controller design is based on a feedback linearization scheme, which is made adaptable by hybridizing the behavior of E.coli bacteria during foraging. Its prime goal is the coordinated control of AC and DC voltage for a D-STATCOM installed in a power distribution system. First, the nonlinear mathematical model of D-STATCOM along with the distribution system is derived. Then, by using input-output feedback linearization, a state feedback control law is obtained by pole placement. The coefficients used for placing the poles at desired location are made adaptable in an online fashion according to operating condition thorough foraging strategy of E.coli bacteria. Digital computer simulations on the complete system for various types of loads and/or disturbances evaluate the efficacy of the control strategy. The comparative study of these results with those obtained in feedback linearization scheme with constant coefficient pole placement technique establishes the elegance of this new adaptable control scheme.