Control scheme of a comprehensive power quality controller

A control strategy of the combined system for power distribution grid is proposed, which is composed of a resonant impedance type hybrid active power filter (RITHAF) and static var compensator (SVC). Based on the topology and operating principles, electric model of combined system is established. Then, its control scheme composed of specified harmonics detection and the neural cell generalized integrator PI control for RITHAF and fuzzy PI control for SVC is designed. The harmonic components of grid are detected by specified harmonics detection while the frequency dividing compensation for specified harmonics is implemented using neural-cell generalized integrator control. The fuzzy PI control adjusts the control parameters online in accordance with control error of power grid voltage and fuzzy rules, enhancing the response speed and control precision of reactive power control. With simple structure and good robustness, the proposed controller adjusts parameters adaptively to improve tracking performance. Finally, results of simulation demonstrate the feasibility and effectiveness of new control scheme.