Investigating a H∞ control method considering frequency uncertainty for CLC type Inductively Coupled Power Transfer system

Based on Generalized State Space Averaging (GSSA) method, this paper realized the output control of an Inductively Coupled Power Transfer (ICPT) system with frequency uncertainty. The state variables in time domain were expanded to generalized state variables in frequency domain and the linear state space model was established. Using linear fractional transformation, the GSSA model was separated into certainty and uncertainty parts to acquire an expanded state space model with perturbation feedback. And a H-infinite robust control method was proposed. In addition, a mixed sensitivity robust controller in frequency domain was developed to eliminate steady state error. Experimental results verified the proposed control method.