Design and Control of Grid-Connected PWM Rectifiers by Optimizing Fractional Order PI Controller Using Water Cycle Algorithm
Sushma Kakkar, Tanmoy Maity, Rajesh Kumar Ahuja, Pratima Walde, R. K. Saket, Baseem Khan, Sanjeevikumar Padmanaban
Abstract
In this paper water cycle algorithm based fractional order PI controller (FOPI) is proposed for virtual flux oriented control of three phase grid connected PWM rectifier. FOPI controller makes the PWM rectifier control more robust due to the fractional behavior. Fractional order controllers have additional degree of freedom and so wider range of parameters is available to provide better control and robustness in the plant. The optimization and design of FOPI controller is done using water cycle algorithm (WCA). WCA is an optimization method inspired by monitoring the water cycle operation and flow of water bodies like streams and rivers in the direction of sea. The performance of FOPI controller is compared with classical integer order PI controller. The parameters of PI and FOPI controllers are optimized and designed using WCA technique leading to WCA-PI and WCA-FOPI controllers. The system is tested using MATLAB/Simulink. The simulation results verify the better performance of WCA-FOPI in terms of settling time, rise time, peak overshoot and Total Harmonic Distortion (THD) of grid current. A robustness measurement with line filter parametric variations and non ideal supply voltage (unbalance and distorted supply voltage) is carried out. The WCA-FOPI demonstrates more robustness as compared to WCA-PI. Simulation findings validate the WCA-FOPI controller outcomes as compared to WCA-PI in terms of control effect and robustness.