Abstract
In this study, a novel flower pollination algorithm (FPA) has been suggested for optimal tuning of P and PI controllers included in a variable speed drive VSD system control circuit. In addition to the manual tuning of controllers’ parameters, several optimization algorithms like GA, PSO, GWO have been used for controllers optimal tuning in different studies. In this study, the errors caused by grid side current harmonic distortion in the VSD system have been used depending on SPWM technique to generate switching signals for a four-quadrant chopper circuit that acts like a filter and compensates the harmonic content in the grid current and smooth ripples in both DC-link current and voltage. The studied drive system and control circuit have been modeled using Matlab/Simulink, then it was linked with the proposed algorithm and tested under different operation conditions. A hardware laboratory model has been built and tested in order to confirm the validity of this study. Comparing the proposed algorithm with other optimization algorithms shows that the suggested algorithm outperforms other algorithms in improving the time response of the VSD system, reducing total harmonic distortion THD of grid current, and reducing ripple factor PF.
Highlights
Electrical drive systems are one of the mainstays of the national economy today as they form the basis of many applications in modern life
The proper selection of these controllers’ parameters affects the performance of control circuit, which in turn affects the performance of VSD system, so an effective optimization technique must be used to detect the optimal values of these parameters instead of using
The values obtained by flower pollination algorithm (FPA) has reduced the total harmonic distortion THD to 27% while the values obtained by Genetic Algorithms (GA) has reduce THD to 30% which means the source current wave has been improved by using FPA
Summary
Electrical drive systems are one of the mainstays of the national economy today as they form the basis of many applications in modern life. The ripple factor RF of both DC-link Currents and voltages effects the overall performance of the VSD system. It was used to smooth both voltage and current waves in Dc-link [6] These different converters schemes need efficient modulation techniques to generate switching signals for the transistors in these circuits. The motor voltage is changed by modulating the width and polarity of the voltage pulse These control circuits are responsible for switching signals generation and they may include different types of controllers such as P and PI. The performed Simulation and experimental study show that this algorithm achieved a better time response of the studied VSD system and reduced Values of the grid current THD and DC-link RF.
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