Angle Position Compensation Control Strategy for High-Speed Power Generation of Aerospace Integrated Switched Reluctance Starting/Generating System

Research on high-speed switched reluctance starting/generating (SRS/G) systems is an important direction to enhance the power generation of aircraft electric power systems. In practical engineering applications, due to the limitation of digital processor performance, the low-frequency discrete control has a great influence on the control accuracy of the commutation process at high speed, which leads to the instability of power generation voltage. In this article, an angle position compensation algorithm is presented to solve the delay of commutation control in high-speed SRS/G systems under low control frequency. By analyzing the high-speed power generation operating characteristics of the switched reluctance motor (SRM), the optimal turn-on and turn-off angles are given for the whole high-speed power generation range of 8000–20000 r/min. The simulation and experimental results show that the angle position compensation algorithm presented in this article can improve the accuracy of commutation control and the voltage quality of high-speed power generation. The pulsation amplitude of the generation voltage can be suppressed below 6 V, and the dc distortion factor can be less than 0.015, which can meet the specifications of the aircraft electric power system for the 270 V dc power supply characteristics.

I. Introduction

The switched reluctance motor (SRM) is very suitable to be used as the core motor of aerospace starting/generating systems because of its advantages of large capacity, simple structure, large starting torque, high power density, high fault tolerance, and appropriate high speed, high temperature, and other harsh conditions [1], [2], [3], [4]. SRM allows bidirectional energy transfer. It has good speed regulation performance in starting mode [5], [6] and does well in high-speed generating mode [7], [8]. Since the control methods of the electric and the generating modes are the same, the conversion between the two modes can be easily realized without any other accessories [9], so it can ensure high stability and fault tolerance in complex and harsh working environments.