Research on Improved Direct Torque Control System of Induction Motor

doi:10.11985/2018.04.002

Abstract

Abstract:

Direct torque control of induction motor three-level inverter speed sensorless inverter system has complex structure, more components,complex flux algorithm due to speed sensorless algorithm based on rotor flux orientation, and inaccuracy of flux observation. To solve the above problems, the topological structure of the three-level inverter is simplified for direct torque control. The speed sensorless algorithm is adopted based on stator flux, and combined with the improved flux observer to observe speed. A modified topology and improved flux observer algorithm of direct torque control of induction motor speed sensorless system are established. The simulation experiments show that the improved method can reduce the loss of the switch device, and improve the precision of the flux observation. It make the speed estimation more accurate.

Key words: Induction motor, three-level inverter, model reference adaptive, flux observer, direct torque control

CLC Number:

TM343

Liu Hong,Li Hong. Research on Improved Direct Torque Control System of Induction Motor[J]. Journal of Electrical Engineering, 2018, 13(4): 11-17.

Figures/Tables 12

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影响因素	潜在危害	优先级
高电压跳变	对逆变器或负载冲击大,损害绝缘	1
中性点电位偏移	电压偏移可能超过IGBT或电容的耐压	2
开关频率	开关损耗	3

合成电压矢量
V₁	100	1-1-1	0-1-1	-1-1-1	100
V₂	110	10-1	0-1-1	10-1	110
V₃	00-1	11-1	110	11-1	00-1
V₄	-10-1	01-1	110	01-1	-10-1
V₅	010	-11-1	-10-1	-11-1	010
V₆	011	-110	-10-1	-110	011
V₇	-100	-111	011	-111	-100
V₈	-1-10	-101	011	-101	-1-10
V₉	001	-1-11	-1-10	-1-11	001
V₁₀	101	0-11	-1-10	0-11	101
V₁₁	0-10	1-11	101	1-11	0-10
V₁₂	0-1-1	1-11	101	1-11	0-1-1

	超调量(%)	调节时间/s	稳态误差(%)
传统 DTC系统	60	0.05	10
改进DTC系统	0.1	0.001	0.001

	超调量(%)	调节时间/s	稳态误差(%)
传统DTC系统	5	0.07	3.3
改进DTC系统	0.01	0.09	0.001