H_∞ mixed sensitivity robust control method of relay ICPT system for output voltage regulation

Aiming at the problem that the output voltage of relay inductive coupled power transfer (ICPT) system is susceptible to changes due to the influence of system load changes, frequency perturbations, and input voltage fluctuations, an H_∞ mixed sensitivity robust control method is adopted to relay ICPT system to regulate the output voltage. First, the working principle of the relay ICPT system is analyzed. Then, the GSSA model of the relay ICPT system is established. By constructing the S/R/T mixed sensitivity function, a suitable weighting function is selected from the frequency domain perspective and converted into H_∞ standard control problem to get a robust controller. Finally, an experimental platform is built to verify the control effect of the controller on the system output voltage. Experimental results show that the designed controller in this paper stabilizes the system output voltage and obtains good tracking performance, suppression parameter perturbation performance, anti-interference performance, and improves system robustness simultaneously.