A composite active filtering scheme for harmonic current and voltage source loads

This paper presents a composite active filtering approach suitable for an electrical utility system containing both current and voltage harmonic source loads. The composite active filter is a combination of shunt and series type active filters. In electrical utility system, the conventional power electronics converter controlled electrical load can be treated as either voltage or current harmonic source load or a combination of both. The composite active filtering technique is proposed to compensate both voltage and current harmonics effectively without using any additional load side passive filter. This methodology is capable to improve utility system input voltage satisfactorily by preventing harmonics due to presence of nonlinear loads. Thereby, performance of other loads connected to the same voltage source will not be affected significantly with the proposed scheme. The necessary MATLAB-SIMULINK software based simulations are performed to validate the suggested technique on a typical utility system comprising of voltage and current harmonic source loads.