Flexible control of single-phase unified power quality conditioner using frequency-domain approach

Abstract

Power conditioning devices are generally designed for full compensation of power quality problems irrespective of the requirements of the consumers. In this article, flexible control of a single-phase unified power quality conditioner is proposed, which attributes the responsibility of the consumer and the utility. For the flexible control of a single-phase unified power quality conditioner, an approach based on Fourier analysis is used. The performance of a single-phase unified power quality conditioner is evaluated for the mitigation of customer-generated harmonics, total current harmonics, reactive power, voltage harmonics, and their combinations, depending on the requirements. In this proposed control strategy, an indirect approach is used in which control is made over the fundamental supply current and fundamental supply voltage instead of the fast changing active power filter current and voltage, thereby reducing the effect of computational delay. A dynamic model of the unified power quality conditioner is developed in MATLAB/SIMULINK (The MathWorks, Natick, Massachusetts, USA), and simulation results demonstrating power quality improvement in the system are presented for a distorted supply and a combination of linear and non-linear loads.