Using LED lighting drivers for harmonic current cancellation in intelligent distribution power systems

Harmonic currents injected from low-cost rectifier loads can cause adverse impacts in electrical distribution systems. This paper presents a harmonic cancellation approach using the light-emitting-diode (LED) lighting systems, which are becoming widely considered in commercial, office, and residential buildings and homes. The proposed approach is based on redesigning the existing LED converter controller to absorb/cancel a specific harmonic current injected by other devices. This can be further exploited in conjunction with the energy management system (EMS) and advanced control network, where a smart meter can inform the LED converters of the harmonic currents to be canceled. A maximum capability of injecting individual harmonics by the LED converter is estimated for the 3^rd, 5^th, and 7^th significant harmonics currents. Simulation results are demonstrated to verify the effectiveness of the proposed approach.