A method of implementation of separating customer and supply side harmonic contributions using an active filter

This paper presents a scheme for implementing an approach to quantify the distortion caused by a single customer when there are many customers in the network, and then mitigate only that portion of harmonics for which the customer is responsible. Many complex theories have been proposed for sharing the responsibility but none suggests a practical way of implementing one such scheme. This paper makes use of the theory of conforming and nonconforming currents for sharing of responsibility which was earlier proposed by one of the authors. All the calculations are based on measurements during the operation and at the point of common coupling. The conforming current has the same graphical pattern as the voltage at point of common coupling. This is the responsibility of the utility. The balance of the current is nonconforming current and is the responsibility of the customer. In this paper, we present the results of simulation studies to demonstrate the feasibility of the approach. It has been demonstrated that the approach is successfully implemented using a digital-signal-processor (DSP) based active filter. The active filter (AF) is based on current controlled voltage source inverter.