Abstract
In order to improve the functionality and efficiency of a unified power quality conditioner (UPQC), a DC-link bus integrated photovoltaic charging module is proposed in a UPQC. It can generate power for essential loads apart from providing energy to a DC-link bus. A conventional proportional integral (PI) controller fails to run smoothly in dynamic conditions of the micro-grid, since it has poor capabilities in determining suitable values of proportional gain and integral gain. So, the optimization algorithm for a PI controller based on chaos particle swarm optimization based on a multi-agent system (CPSO-MAS) algorithm was developed in this paper to overcome properties such as intermittent instability in the micro-grid. Through verification by simulation and experiment of UPQC harmonic compensation, it showed that the proposed DC link bus voltage control strategy can be effectively applied to UPQC towards various conditions related to voltage and current distortion. In addition, it proved that the proposed strategy has faster convergence than other algorithms, which enhances the stability of DC-link bus voltage. Hence, the contribution presented in this paper is to provide a novel approach for the power quality improvement of UPQC.
Highlights
In recent years, the fast development of renewable energy sources provides a desired solution to the contradiction between energy and environment
The unified power quality conditioner (UPQC) is composed of a series active power filters (SAPFs) and paralleled active power filters (PAPFs) [7]
In order to validate the effectiveness of the DC-link bus voltage control strategy, the harmonic elimination in the UPQC is taken as an example to illustrate the influence of the DC-link bus voltage control to the UPQC performance
Summary
The fast development of renewable energy sources provides a desired solution to the contradiction between energy and environment. The UPQC is composed of a series active power filters (SAPFs) and paralleled active power filters (PAPFs) [7] It can compensate reactive power and harmonic and negative sequence currents that are caused by non-linear loads or other electrical equipment, but can compensate the voltage distorted at the source side [8,9,10,11]. On the condition of voltage sag, the DC-link bus of the UPQC plays a great role in the interchange of the energy of the series active power filter (SAPF) and parallel active power filter (PAPF). To further verify the effectiveness of the proposed scheme, a simulation and a scaled down laboratory prototype of the UPQC was developed Through both simulation and experiment with the UPQC harmonic compensation, the compensated current waveform derived from the CPSO-MAS algorithm was proved fairly smooth and nearly sinusoidal towards various conditions in the micro-grid.
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