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Voltage space vector pulse width modulation method

A technology of voltage space vector and pulse width modulation, which is applied in the direction of converting irreversible DC power input into AC power output, which can solve the problems of large amount of calculation, etc., and achieve the effect of less calculation times, convenient digital realization, and simple realization

Active Publication Date: 2012-02-22
四川科陆新能电气有限公司
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Problems solved by technology

[0037] It can be seen from the above that the prior art voltage space vector pulse width modulation method needs to perform complex sine functions and judge switch sectors to determine the action time of the basic vector, which results in a large amount of calculation, and its complex algorithm is also difficult for high-precision real-time control. had a non-negligible impact

Method used

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  • Voltage space vector pulse width modulation method
  • Voltage space vector pulse width modulation method
  • Voltage space vector pulse width modulation method

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Embodiment Construction

[0062] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0063] Such as Figure 8 The shown flow chart of the voltage space vector pulse width modulation method of the present invention specifically includes the following steps:

[0064] First decompose the voltage vector into Combination of two voltages on the shaft:

[0065]

[0066] in For a given reference voltage vector, For a given reference voltage vector with the axis angle between.

[0067] Will Convert to three-phase voltage

[0068]

[0069] Take the three-phase voltage The minimum value of =Min( ), Subtract respectively ,get

[0070]

[0071] Assume =Max( ),Pick and the maximum value of ,in is the input terminal voltage.

[0072]

[0073] Get the switching time of the three-phase voltage , , .

[0074] Preferably, in order to make ...

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Abstract

The invention relates to the field of pulse width modulation, and discloses a voltage space vector pulse width modulation method. The method comprises the following steps of: 1, giving a reference voltage vector Ur, and decomposing the given reference voltage vector into synthesis of two voltages on axes alpha and beta; 2, converting the Ualpha and Ubeta into a three-phase voltage; and 3, according to Umin=Min(Ua, Ub, Uc), Ua'=Ua-Umin, Ub'=Ub-Umin, Uc'=Uc-Umin and U*max=Max(Ua', Ub', Uc', Vdc), obtaining the switching time Ta', Tb' and Tc' of the three-phase voltage: Ta'=Ua' / U*max, Tb'=Ub' / U*max and Tc'=Uc' / U*max. Because multiple times of calculation of trigonometric functions is not needed and the over-modulation area does not need to be judged, the method is simple and convenient to implement, low in calculation frequency and convenient to realize a digital mode, and can be applied to all three-phase inverter systems.

Description

technical field [0001] The present invention relates to a pulse width modulation (PWM, PulseWidthModulation) method, in particular to a general method that is convenient for a computer to realize voltage space vector pulse width modulation. Background technique [0002] With the development of computer control technology and semiconductor electronics technology, power electronics technology based on microprocessors and controllable switching devices has been widely used in human production and life. Especially in the industrial field, traditional phase-controlled rectifiers are gradually giving way to low-harmonic, high-power-factor PWM rectifiers, and digital high-performance AC drive systems have completely replaced DC drive systems to become the current rail transit and metallurgical industries. mainstream. [0003] Pulse width modulation technology is one of the basic and key technologies of modern AC drives and PWM rectifiers. Among the various pulse width modulation t...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 杨西全廖亮陈京
Owner 四川科陆新能电气有限公司
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