Dynamic Performance Improvement Based on Busbar Current and Field Current Prediction for Doubly Salient Electromagnetic Generator

To optimize the dynamic performance and speed up the dynamic process while the load changes, a busbar voltage regulation method is proposed for the doubly salient electromagnetic generator (DSEG) system. The proposed method adopts busbar current instead of busbar voltage as the target of the outer loop controller. The conduction patterns of the asymmetric H-bridge are analyzed, and the relationship between duty cycle and field current is acquired through the mathematically fitted parameters. Based on the above, the field current prediction model is built as the inner loop. A comparative analysis is conducted to evaluate the performance of the busbar voltages of the proposed method and the conventional control method. Experimental results verify the effectiveness of the proposed method in reducing busbar voltage variation on the 12/8-pole DESG system. The proposed method improves the dynamic performance during load changes, resulting in accelerated conversion processes. The proposed method also exhibits satisfactory transient and steady-state characteristics within a broad range of load current.