基于改进磁链估算器的航空飞轮电机起动性能

Flux estimator for starting of an aero flywheel motor

航空飞轮电机(aero flywheel motor)是将航空活塞发动机(piston aero-engine)的起动机、飞轮和发电机集成为一体的新型电机。鉴于航空发动机的特殊要求,具有响应速度快、控制结构简单、鲁棒性好等优点的直接转矩控制(direct torque control,DTC)适合作为航空飞轮电机的起动算法。直接转矩控制的一个核心环节是磁链估算器,它主要受磁链初值、直流偏移、电阻变化、逆变器非线性等的影响。为了解决这一问题,该文设计了一种改进的低通滤波式磁链估算器,通过对航空飞轮电机的转子进行定位来确定磁链初值,并把逆变器非线性的影响转换为对电阻实时补偿的问题,并基于改进的磁链估算器进行了航空飞轮电机起动仿真。结果表明:改进的磁链估算器改善了航空飞轮电机起动瞬间的收敛性,并降低了电磁转矩和直轴电流波动。

Aero flywheel motors integrate a starter,flywheel,and generator in a heavy fuel piston aero-engine.Direct torque control(DTC)gives quick dynamic response,has a simple structure,and is very robust so it is the best choice for controlling aero flywheel motors.The flux estimator,the most important part of the controller,is influenced by the initial value,DC offset,resistor error,and inverter nonlinearity.This paper describes a flux estimator based on a low pass filter(LPF)to improve the estimates.Simulations of the aero flywheel motor starting performance with this flux estimator show that that the starting performance is improved.