Optimal and adaptive active filtering under non stiff and distorted voltage conditions

In this paper operation of OFC based active power filters under non stiff and distorted voltage conditions is investigated. Under these conditions there exist a feedback from the load currents to the load voltages hence this situation makes the OFC based system a closed loop adaptive system which may represent an unstable or poor transient response behavior. By identifying the source equivalent circuit an improved OFC algorithm (IOFC) has been proposed. The proposed control algorithm considers the load voltages variation due to the load current variation. Successful performance of the proposed algorithm has been investigated and proved by several MATLAB IOFC systems, which minimizes the load voltage harmonics, has been proposed and investigated.