Torque Ripple Reduction Method of Switched Reluctance Motor Based on Five-Level Converter

doi:10.16183/j.cnki.jsjtu.2022.124

Abstract

Abstract:

Aimed at the problem of large torque ripple and low efficiency caused by the poor current tracking effect of switched reluctance motor (SRM), a torque ripple reduction method of switched reluctance motor based on a five-level converter is proposed. A novel five-level converter with A and C phases or B and D phases sharing the same bridge arm is designed. Compared with the traditional converter, the control is more flexible and the cost is lower. According to the nonlinear model of SRM, the conduction region is reclassified, and the phase output torque with a large inductance change rate is preferred to avoid excessive peak current at the beginning of commutation. Aimed at the problem of poor winding current tracking ability when the speed and load conditions change greatly, the direct instantaneous torque control (DITC) method based on the five-level converter is proposed, and the DITC conduction rules at low and high speeds are designed. According to the current speed, the torque error, and the rotor position, the appropriate conduction mode is selected to make sure that the motor can run stably at a low speed and the current can track the required value in time at a high speed, so as to realize the reduction of torque ripple. The simulation and experimental results show that compared with the traditional DITC, the control strategy can reduce the torque and current ripple in a wide speed range and improve the dynamic characteristic of the torque.

Key words: switched reluctance motor (SRM), five level converter, current tracking ability, torque ripple, instantaneous torque control

CLC Number:

TM352

LING Hui, DU Qinjun, FENG Han, PANG Hao, YANG Shuxin, LUO Yonggang. Torque Ripple Reduction Method of Switched Reluctance Motor Based on Five-Level Converter[J]. Journal of Shanghai Jiao Tong University, 2022, 56(12): 1608-1618.

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器件	不对称半桥			文献[17]功率电路			5L-ADCC
器件	额定伏安值	数量	总额定伏安值	额定伏安值	数量	总额定伏安值	额定伏安值	数量	总额定伏安值
开关管	U×I	8	8UI	U/2×I	16	8UI	U/2×I	12	6UI
续流二极管	U×I	8	8UI	U×I/2	8	4UI	U×I/2	6	3UI
钳位二极管		0	0	U/2×I	8	4UI	U/2×I	6	3UI
总器件		16	16UI		32	16UI		24	12UI

区间	ΔT≤-T_H	-T_H<ΔT<0	0≤ΔT<T_H	ΔT≥T_H
R₁	(-1,-1)	(-1, 0)	(α, α)	(1, 1)
R₂	(0,-1)	(0, 0)	(α, α)	(1, 1)
R₃	(-1,-1)	(0,-1)	(α,-1)	(1,-1)

区间	ΔT≤-T_H	-T_H<ΔT<0	0≤ΔT<T_H	ΔT≥T_H
R₁	(-2,-2)	(-2, 0)	(1, 1)	(2, 2)
R₂	(-1,-2)	(0, 0)	(1, 1)	(2, 2)
R₃	(-2-2)	(0,-2)	(1,-2)	(2,-2)

T_L/(N·m)	n/(r·min^-1)	K_T/%	K_I/%	I_rms/A
5	200	15.12	273.38	6.76
5	400	14.54	243.16	6.51
5	800	14.21	224.36	5.78
15	1 200	6.14	181.94	17.56
15	1 600	6.55	176.22	17.94
15	2 000	10.17	180.04	17.87

T_L/(N·m)	n/(r·min^-1)	K_T/%	K_I/%	I_rms/A
5	200	10.21	131.43	4.67
5	400	10.15	127.67	4.32
5	800	10.14	131.37	4.84
15	1 200	4.01	144.25	16.32
15	1 600	4.25	164.87	15.27
15	2 000	4.65	152.88	15.37