多电飞机大功率高压直流起动发电机系统研究与实现

起动发电（SG）一体化是多电飞机（MEA）和全电飞机（AEA）机载主电源系统的重要特征与关键技术。高压直流电源（HVDC）系统输出不受交流电频率约束，电机可工作在更高转速从而提高功率密度，且易于并联提高供电可靠性，已经成为飞机电源系统的重要发展方向。提出三级式高压直流起动发电系统架构，阐述了其组成和工作原理，分析了发电和起动模态下永磁发电机（PMG）、励磁机（ME）和主电机（MG）的运行特性，以及发电模态下励磁机的恒流源和电流放大器特性；研究了起动模态下主电机的转矩产生机理和影响因素以及励磁机单相交流励磁特性。研制成功120 kW/270 V高压直流起动发电机系统，构建起动发电一体化实验平台，完成了发电及发动机模拟起动运行实验，实验与仿真结果一致，为大功率高压直流起动发电系统在新一代飞机上的应用奠定了理论和技术基础。

Research and implementation of high-power high-voltage DC brushless starter generator system for more-electric-aircraft

The Starter Generator (SG) system is an important feature and key supporting technology for More-Electric-Aircraft (MEA) and All-Electric-Aircraft (AEA). Since it is free from frequency constraints, high-voltage DC (HVDC) SG can work at higher speeds, which can further improve the power density and the system reliability. High-power HVDC power system has become an important development direction for aircraft power systems. This paper proposes the architecture of a HVDC SG system based wound rotor synchronous machine and elaborates on its composition and working principles. The operating characteristics of the Permanent Magnet Machine (PMG), the Main Exciter (ME), and the Main Generator (MG) under the generating mode and the starting mode are summarized. The constant current source characteristic and the current amplifier characteristic of the ME under the generating mode are analyzed in detail. Meanwhile, the torque generation principles and the influencing factors of the MG, together with the single-phase AC excitation characteristics of the ME, are discussed and analyzed with simulation methods. Finally, the generating and starting experiments of a 120 kW/270 V wound rotor HVDC SG are carried out. The integrated experimental platform for the starter generator system is constructed, and the power generation and engine simulation start-up experiments are carried out. The experimental and simulation results are consistent. The breakthrough of the key technology of high-power wound rotor HVDC SG system lays the technical foundation for its installed application on the new generation of aircraft.