Improved H∞ Control for Input-Series OutputSeries Multi-Channel Inductive Power Transfer System Considering Parameter Inconsistency and Load Perturbation

To achieve stable output and enhance the robustness of input-series output-series multi-channel inductive power transfer system under parameter inconsistency and load perturbation, an improved H∞ robust control is proposed in this paper. Firstly, the control effect of multi-channel system is analyzed, which transfers the controller design into single system with uncertainty. Then, a linear model is established based on generalized state space averaged (GSSA) method and the influence of parameter inconsistency and load perturbation is analyzed. After that, the uncertain model is obtained via frequency-domain analysis, generating a numerical solution of weighting function to describe the uncertainty of parameter inconsistency and load perturbation. Based on the proposed weighting function, the improved H∞ robust controller is designed and the dynamic performance and robustness of the close-loop system is analyzed. Finally, a down-scale prototype with 3 channels is built to verify the effectiveness of the proposed method. The experimental results show that the system obtains good dynamic performance and strong robustness against parameter inconsistency and load perturbation. When load changes between 60Ω and 80Ω, the settling time is less than 4.7ms with the overshoot being less than 7.3%. Even against large load perturbations, the settling time is still less than 8ms.