一种适用于航空发电机系统的闭环I/f控制方法

doi:10.7527/S1000-6893.2023.28678

Abstract

Abstract:

It is required that the aero-engine starter/generator system can start reliably when the load torque is unknown and the mutation is obvious in case of heat engine and cold engine. The starting time is also required to be as short as possible too. The traditional open-loop I/f control method of permanent magnet synchronous motor has some problems， such as long speed adjustment time， low current utilization rate， and easy out-of-step phenomenon when the given current does not match the load torque， so it is not suitable for the aero-engine starter/generator system. In this paper， an improved closed-loop I/f control strategy is proposed based on instantaneous power disturbance detection. By detecting instantaneous active power， the frequency of the given current vector is compensated， the damping torque component of the system is increased， and the speed convergence is accelerated. By detecting instantaneous reactive power， the amplitude of current vector is adjusted to keep the motor working in the state of maximum torque/current ratio and adapt to the sudden change of load torque. At the same time， a linearized model is established based on small signals. The stability and robustness of the traditional and the improved I/f control methods are compared， and the appropriate damping compensation coefficient is selected. Finally， it is verified through simulation and experiment that the improved closed-loop I/f starting control method can reduce the speed fluctuation by ±60 r/min in the acceleration stage， reduce the speed convergence time by 0. 3 s， and improve the current utilization rate by about 20%. The improved method can also adapt to the unknown and sudden load torque change in the aero-engine starter/generator system. When the given current is adjusted in time， the out-of-step phenomenon will no longer occur and reliable starting can be realized. The results show that the improved method can be effectively applied in the aero-engine starter/generator system.

Key words: starter-generator system, permanent magnet synchronous machine, I/f control method, root trajectory analysis, instantaneous power

CLC Number:

V242.4

Zhenyang HAO, Fengtao SUN, Zhihao JI, Xinyuan JING, Xin CAO. An improved closed⁃loop I/f control method for aero⁃generator systems[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(3): 328678-328678.

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References 22

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参数	数值	参数	数值
直流输入电压/V	270	定子电阻/Ω	0.015
额定转速/（r·min^-1）	20 000	交/直轴电感/μH	280
额定扭矩/（N·m）	4.5	转子磁链/Wb	6.6×10^-2
额定电流/A	100	转动惯量/（kg·m²）	1.17×10^-3
极数	2	开关频率/Hz	16 000

实验序号	起动条件	起动情况	升速阶段转速波动/（r·min^-1）	转速稳定收敛时间/s	最大负载电流利用率/%
1	给定50 A，热机，传统I/f	失步	±80	0.406	无法稳定运行
2	给定50 A，冷机，传统I/f	失步	±70	无法稳定运行	无法稳定运行
3	给定50 A，热机，改进I/f	可靠起动	±30	0.125	79.5
4	给定50 A，冷机，改进I/f	可靠起动	±20	0.141	92.2
5	给定100 A，热机，传统I/f	可靠起动	±120	0.266	62.6
6	给定100 A，冷机，传统I/f	可靠起动	±100	0.328	73.7
7	给定100 A，热机，改进I/f	可靠起动	±30	0.133	79.2
8	给定100 A，冷机，改进I/f	可靠起动	±30	0.129	92.6

[1]	LU Jiawei, ZHANG Zhuoran, LI Jincai, KONG Xianghao. Characteristic analysis of dual-winding permanent magnet synchronous machine with phase-shifted windings for electric propulsion aircraft [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(5): 325230-325230.
[2]	YAN Liming, GUO Xin, ZHAO Dongdong. Model predictive torque control of permanent magnet synchronous motor using novel analytic weighting factor assignment [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(12): 327785-327785.

An improved closed⁃loop I/f control method for aero⁃generator systems

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