Observer Based Current Sensorless Control for DAB Converter with Improved Dynamic Performance

This article proposes a current sensorless sliding mode control strategy of dual active bridge converter (DAB). Here, the load current is estimated by using nonlinear disturbance observer. Then this estimated load current is used as a feedforward signal in sliding mode control. The proposed control strategy can regulate the output DC voltage with good disturbance rejection capability, fast dynamic response and accurate reference voltage tracking without using current sensor. The complete design procedure with mathematical analysis is presented. Moreover, the performance of the proposed controller has been compared with other conventional controllers. The proposed controller is simulated in MATLAB and real time OPAL-RT platform used to verify its performance. Typical results are presented