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Control method and device for solving space vector pulse width modulation current zero-crossing distortion

A space vector pulse width and zero-crossing point distortion technology, which is applied to output power conversion devices, AC power input conversion to DC power output, electrical components, etc., can solve space vector pulse width modulation current zero-crossing point distortion and complex control methods and other problems, to achieve the effect of reducing control complexity, good control effect, and reducing mutation

Active Publication Date: 2017-02-22
XJ POWER CO LTD +3
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Problems solved by technology

[0005] The purpose of the present invention is to provide a control method for solving space vector pulse width modulation current zero-crossing distortion, in order to solve the problem that the traditional control method for solving current zero-crossing distortion is relatively complicated
The invention also provides a control device for solving zero-crossing distortion of space vector pulse width modulation current

Method used

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  • Control method and device for solving space vector pulse width modulation current zero-crossing distortion

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Embodiment Construction

[0026] Embodiment of control method

[0027] Such as figure 1 As shown, it is a topological diagram of a three-phase rectifier provided in this embodiment. The invention of the present invention lies in a control method for solving the zero-crossing distortion of a Space Vector Pulse Width Modulation (SVPWM) current. Therefore, the control method does not not restricted in figure 1 in the three-phase rectifier. Moreover, since the Space Vector Pulse Width Modulation (SVPWM) technology belongs to the existing technology and is relatively mature at present, this embodiment does not describe the SVPWM itself in detail.

[0028] Such as figure 1 As shown, Va, Vb and Vc are the AC input of the three-phase rectifier, and the input AC is processed by the EMI anti-electromagnetic interference circuit, La, Lb and Lc are Boost inductors, D1-D6 are rectifier diodes, Q1, Q2, Q3, Q4 , Q5 and Q6 are rectifier MOS tubes, Vp and Vn are positive and negative bus capacitors respectively. T...

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Abstract

The invention relates to a control method and device for solving space vector pulse width modulation current zero-crossing distortion. The method comprises the following steps: to begin with, collecting each phase of phase voltage; then, judging whether phase voltage crosses zero in a positive zero-crossing manner or a negative zero-crossing manner; when the phase voltage crosses zero in a positive zero-crossing manner, a positive / negative carrier switching point is arranged within COMP-PRD; and when the phase voltage crosses zero in a negative zero-crossing manner, the positive / negative carrier switching point is arranged within 0-COMP. The method can effectively increase switching point switch tube conduction time to reduce abrupt change of zero crossing point duty ratio, thereby reducing zero-crossing point current distortion. The method is simple in control process, reduces control complexity and improves control reliability.

Description

technical field [0001] The invention relates to a control method and device for solving zero-crossing distortion of space vector pulse width modulation current. Background technique [0002] In the three-phase rectifier control system, the vector wave generation method (that is, the space vector pulse width modulation method, SVPWM) has the advantages of small inductor current ripple, fast dynamic response speed and high reliability compared with the ordinary wave generation method, so it is widely used; The characteristics of vector wave transmission determine that the positive and negative triangular carriers are switched when the AC phase voltage crosses the zero point. At this time, the triangular carrier moves to the right by 180° phase angle, resulting in a sudden change in the PWM duty cycle of 1.5 times the switching period, resulting in current distortion. When the voltage of a phase crosses the zero point, the zero-crossing distortion of the current of the phase wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/2173H02M1/0038
Inventor 刘振威王继忠徐亚超曹亚乔海强刘超邓长吉袁顺刚胡永华
Owner XJ POWER CO LTD
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