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SVPWM (Space Vector Pulse Width Modulation) method

A space voltage vector and pulse width modulation technology, which is applied in the direction of irreversible DC power input conversion to AC power output, can solve the problems of complex calculation, poor versatility, and poor timeliness

Inactive Publication Date: 2012-09-19
WUXI DARING GUANGSHENG ELECTRICAL CO LTD
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  • Application Information

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Problems solved by technology

[0036] In order to overcome the defects and deficiencies in the prior art, the present invention proposes a space voltage vector pulse width modulation method, which solves the complex calculation, poor versatility and poor timeliness of the space voltage vector modulation method in the prior art by injecting higher harmonics The problem

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Embodiment Construction

[0071] In order to describe the technical content, achieved objectives and effects of the present invention in detail, the following will be described in detail in conjunction with the implementation methods and accompanying drawings.

[0072] Figure 6 It is a flowchart of a space voltage vector pulse width modulation method according to an embodiment of the present invention. Specifically include the following steps:

[0073] S1: Calculate the carrier ratio by formula (1), and determine the angle θ corresponding to each PWM cycle in a single cycle of the fundamental wave according to the carrier ratio 0 ,

[0074] N=f c / f r (1)

[0075] Among them, f c is the set carrier frequency, f r is the set output fundamental frequency,

[0076] θ 0 =2π / N, the angle of a single cycle of the fundamental wave is from 0 to 2π;

[0077] Set the carrier frequency f c , the carrier frequency is not only the frequency of entering the timer interrupt, but also the frequency of ...

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Abstract

The invention discloses a SVPWM (Space Vector Pulse Width Modulation) method which comprises the following steps of: confirming an angle theta 0 corresponding to each PWM (Pulse Width Modulation) period within a single period of a fundamental wave according to a carrier-to-noise ratio; calculating a present angle theta n according to the theta 0; obtaining an amplitude value of a three-phase output at the present by a quantified SPWM (Sinusoidal Pulse Width Modulation) wave; injecting a higher harmonic on the basis of the quantified SPWM wave to enable the shape of the outputted SVPWM waveforms with different frequencies to be consistent with the shape of the waveform obtained according to a traditional SVPWM method and realize an over-modulation function; and meanwhile, setting the frequency, thereby enabling the flux linkage rotation of the space vector to be more approximate to a circular magnetic field. According to the SVPWM method provided by the invention, the dependence on mechanical parameters of system is weakened, the operation volume is reduced, the harmonic influence is reduced, the robustness of the system is enhanced, and the generality and timeliness are higher.

Description

technical field [0001] The invention relates to a vector modulation method in the field of AC frequency conversion, in particular to a space voltage vector pulse width modulation method. Background technique [0002] Space voltage vector pulse width modulation (SVPWM) and sinusoidal pulse width modulation (SPWM) are the two most common modulation methods in three-phase inverter circuits. Sinusoidal pulse width modulation (SPWM) is a relatively mature and widely used PWM method. This modulation method is based on the fact that when narrow pulses with equal impulse (area of ​​narrow pulse) and different shapes are added to the link with inertia, the effect will be Basically the same principle, realize the pulse width modulation of the sine wave. Space Voltage Vector Pulse Width Modulation (SVPWM) regards the inverter and the motor as a whole, starting from the overall effect of the three-phase output voltage, the output voltage of the three-phase inverter is synthesized into ...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 岑瑞
Owner WUXI DARING GUANGSHENG ELECTRICAL CO LTD
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