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A novel scheme for mitigation of line current harmonics and compensation of reactive power in three phase low voltage distribution systems

This paper presents a novel scheme for mitigation of line current harmonics and compensation of reactive power in three-phase low voltage distribution systems. The system uses a three-phase, four-wire, PWM bi-directional converter with battery storage. The converter is synchronised and connected to the utility supply through link inductors. The line harmonic currents are reduced based on the principle that the current flowing through the link inductor will contain only fundamental frequency if the voltage across the inductor is a sinewave. The mitigation of harmonics in the line currents also results in minimising neutral harmonic currents. Results from simulation using PSCAD/EMTDC and laboratory tests are included.