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Improved direct torque control method of common direct current bus type open winding permanent magnet synchronous motor system

A permanent magnet synchronous motor, direct torque control technology, used in motor generator control, electronic commutation motor control, control system and other directions

Active Publication Date: 2019-10-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no research on the system strategy of common DC bus type open-winding permanent magnet synchronous motor based on direct torque control. Therefore, in order to suppress the zero-sequence current, it is necessary to make corresponding adjustments on the basis of conventional direct torque control to improve the operating performance of the system.

Method used

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  • Improved direct torque control method of common direct current bus type open winding permanent magnet synchronous motor system
  • Improved direct torque control method of common direct current bus type open winding permanent magnet synchronous motor system
  • Improved direct torque control method of common direct current bus type open winding permanent magnet synchronous motor system

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Embodiment Construction

[0078] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0079] Such as figure 1 As shown, in the common DC bus type open-winding permanent magnet synchronous motor system, two three-phase six-switch inverters INV1 and INV2 are respectively connected to the two ends of the three-phase stator of the motor, S a1 ~S c2 Indicates the switch states of the six bridge arms. When S=1, the upper bridge arm of the switch is turned on, and the lower bridge arm is turned off; when S=0, the lower bridge arm of the switch is turned on, and the upper bridge arm is turned off.

[0080] Such as figure 2 As shown in , select 6 synthetic vectors that can be generated by two inverters as the selected basic voltage vector, V 1 ~V 6 The inverter switching state S a1 , S b1 , S c1 , S a2 , S b2 , S c2 They are: 100001, 010...

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Abstract

The invention discloses an improved direct torque control method of a common direct current bus type open winding permanent magnet synchronous motor system. Six voltage vectors which generate a zero sequence voltage of zero are selected as basic voltage vectors, and optimal voltage vectors of each sampling period are determined according to flux linkage and torque errors; meanwhile, a zero voltagevector is introduced, and an action position and action time of the zero voltage vector are determined according to a given zero sequence voltage of a zero sequence circuit loop; and direct torque control on the common direct current bus type open winding permanent magnet synchronous motor is realized. Therefore, the method is simple in control thought, low in implementation difficulty, high in dynamic response speed, capable of effectively inhibiting a zero sequence current, low in calculation amount and small in system burden.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to an improved direct torque control method for a common direct current bus type open-winding permanent magnet synchronous motor system. Background technique [0002] The common DC bus type open-winding permanent magnet synchronous motor is a new type of structure in which the two ends of the stator winding of the traditional Y-connected permanent magnet synchronous motor are opened to form an open winding, and a DC power supply supplies power to both ends at the same time. This motor has a simple structure , which can generate abundant voltage vectors to increase the voltage level and reduce the system fault tolerance. Since the zero-sequence loop is closed, the zero-sequence voltage generated by the voltage vector and the rotor flux harmonics will cause zero-sequence current, and the zero-sequence current will cause current harmonics to increase, motor temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/30
CPCH02P21/30
Inventor 孙丹程一飞陈文汉
Owner ZHEJIANG UNIV
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