Decoupled Current Control of Induction Motors Drives with Internal Model Based on Active Disturbance Rejection Control Strategy

Field-oriented control (FOC) is a preferred control method for induction motors. The purpose of FOC is to guarantee perfect dynamic and steady performance of induction motors, but there is cross-coupling between dq current components, which impairs the characteristics of response. Therefore, a decoupled current control strategy using internal model based on active disturbance rejection control (ADRC) is proposed. The internal model control (IMC) is used to control an ideal motor decoupled model, which is directly related to the system dynamic response performance. The ADRC is used to estimate and compensate the disturbances so that it reduces the reliance of IMC on the time constant of filter when the model mismatches. The proposed method has great contribution to the robustness of parameter uncertainties and disturbances. The experimental results indicate that the robustness of the proposed optimal design method for IMC is better than the conventional IMC when the disturbances occur and the model mismatches, and the method is feasible and effective.