Steady-State Efficiency Improve Method for Doubly Salient Electro-Magnetic Generation Systems under High Dynamic Response Constraints
Wang Peng1, Xu Yanwu1, Zhang Zhuoran2
1. School of Electrical and Automation Engineering Nanjing Normal University Nanjing 210023 China; 2. Jiangsu Provincial University Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics Nanjing 211106 China
Abstract：The doubly salient electro-magnetic generator（DSEG）is a competitive candidate for the next-generation aircraft DC electrical power system due to its fault-tolerant excitation control and absence of rotor windings. Nevertheless, its application faces a fundamental limitation: a structural conflict between achieving high steady-state efficiency and maintaining rapid dynamic response under strict aviation technical standards. Therefore, this paper proposes a coordination-control-parameter transition（CCPT）strategy based on coordinated current optimization. The impact of coordination control parameters on the performance of the DSEG system is analyzed. A control model for optimal efficiency under steady-state conditions is established, and a field-current transient-compensation model is designed to enhance response capability during dynamic processes. The proposed CCPT control method employs a transition-parameter cluster to enhance steady-state efficiency while meeting dynamic-response constraints. This approach enables smooth transitions of coordination control parameters during shifts between dynamic and steady-state operating modes. Consequently, it achieves optimal steady-state efficiency control without compromising the required high dynamic performance. The loss mechanisms of the DSEG system are investigated. Copper losses, comprising armature and field-winding losses, and core losses, categorized as hysteresis, eddy-current, and excess losses, are modeled via simulations. The results indicate that both copper and core losses vary nonmonotonically with the conduction angle, initially decreasing and then increasing. Thus, an optimal conduction angle can be identified for any given load power, and a steady-state, efficiency-optimal coordination control trajectory is established. Dynamic response optimization is impeded by the large time constant inherent in the field windings. This work introduces a paradigm shift in control strategy by coordinating armature-current control through conduction-angle modulation to compensate for field-current transients. Minimizing the required change in field current during dynamic processes enhances the DSEG system's dynamic response. Furthermore, a parameter cluster is established to define trajectories that minimize variation in field current. The proposed CCPT method identifies the intersection or the nearest points between the steady-state efficiency-optimal parameter trajectory and the dynamic response-optimal parameter cluster. In a steady state, the system operates at the efficiency optimal point. Once a dynamic disturbance is detected, the control smoothly shifts along a predefined dynamic response optimization trajectory within the parameter cluster adjacent to the initial steady-state point. By coordinating adjustments to the conduction angle and field current, the transient in field current is minimized. DC bus voltage can be regulated rapidly with reduced overshoot/undershoot and shorter recovery time. After the dynamic event subsides and a new steady state is established, the control parameters smoothly return along a steady-state efficiency-optimization trajectory to the new optimal efficiency point corresponding to the updated load condition. Experimental validation is conducted on a 12/8-pole DSEG prototype. Compared with diode rectification and fixed-conduction-angle APC control, the proposed CCPT method demonstrates superior performance. Steady-state efficiency is significantly improved across a range of load points. For instance, at a load of 3 kW and a speed of 4 000 r/min, the efficiency increases from approximately 79.46% to 87.03%. More critically, during load transients, the CCPT method reduces the bus voltage dip from 248 V to 252 V to 256 V and shortens the recovery time to 20 ms. During load shedding, it limits the voltage peak to 280 V with a 20 ms recovery time, whereas the other strategies result in peaks of 292 V to 338 V and longer recovery periods. The proposed CCPT control method coordinates parameter scheduling to facilitate smooth transitions between efficiency-optimal and response-optimal operating modes. Simulations and experiments confirm that the CCPT method effectively enhances steady-state efficiency while maintaining, and even improving, dynamic performance under strict aviation technical standards. The CCPT method lays theoretical and practical foundations for applying the DSEG in fields with stringent demands on steady-state efficiency and dynamic response, such as aircraft power generation systems.
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2026, Vol. 41 
