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针对内置式航空发电系统高功率密度、高可靠性和高输出性能的要求,提出了基于三相四桥臂的航空用永磁容错发电系统。利用永磁容错电机大电感的特点,改进了传统弱磁控制算法,提出了简单高效的直轴电流Id解析法弱磁控制,通过实时计算弱磁电流给定实现了宽速范围(3倍额定转速)内的恒压发电控制。同时,根据容错电机磁隔离的特点,以保证故障前后电机定子磁场为圆形旋转磁场为前提,结合电压空间矢量脉宽调制(SVPWM)算法实现了单相断路或短路故障的容错发电控制。通过MATLAB仿真验证了控制算法的正确性。最后,对一套7.5kW永磁容错发电系统进行了算法验证实验,验证了I_d解析法弱磁控制和容错控制的可行性,为后续的系统性能测试打下基础。
Aiming at the requirement of high power density, high reliability and high output performance of built-in avionic power generation system, a permanent magnet fault-tolerant power generation system for aviation based on three-phase four-legged arm is proposed. Based on the characteristics of large inductances of permanent magnet fault tolerant motors, the traditional weak field control algorithm is improved. A simple and efficient weak axis current Id analysis method is proposed to realize the weak field control. The real-time calculation of field weakening current can achieve wide speed range Speed) within the constant voltage power generation control. At the same time, according to the characteristics of fault-tolerant motor’s magnetic isolation, the fault-tolerant motor stator magnetic field is a circular rotating magnetic field, and fault-tolerant generation control of single-phase open-circuit or short-circuit fault is implemented by SVPWM algorithm. The correctness of the control algorithm is verified by MATLAB simulation. Finally, a set of 7.5kW permanent magnet fault-tolerant power generation system is verified by an algorithm, verifying the feasibility of the I_d analytic flux weakening control and fault-tolerant control, and laying the foundation for subsequent system performance testing.