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SVPWM modulation method

A modulation method and wave modulation technology, applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the problems of cumbersome and complicated calculation process

Inactive Publication Date: 2015-04-29
HEBEI UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a SVPWM modulation method to solve the cumbersome and complicated problems of the existing modulation method

Method used

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Embodiment Construction

[0059] For active inverters, the three-phase voltage of the power grid and the three-dimensional coordinates of the voltage synthesis vector track is a circle; for the asynchronous motor control, the rotation track of the flux linkage vector under the action of the three-phase voltage is also a circle.

[0060] The three-phase phase voltages output by the inverter are u, v, and w, which are respectively added to the three-phase plane static coordinate system with a mutual difference of 120° in space, and three voltage space vectors u(t), v(t ), w(t), their direction is always on the axis of each phase, and their magnitude changes with time according to the sinusoidal law, and the time phase difference is 120°. Suppose U m is the effective value of the phase voltage, f is the power frequency, then:

[0061] u(t)=U m cos(θ) (16)

[0062] v(t)=U m cos(θ-2π / 3) (17)

[0063] w(t)=U m cos(θ+2π / 3) (18)

[0064] Among them, θ=2πft=ωt, the resultant space vector U(t) of three...

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Abstract

The invention provides an SVPWM modulation method which belongs to three-part modulation methods. The method comprises the steps that in the process of calculating Tk, Tk+1 and T0 of SVPWM modulation waves, the influences of the amplitude and output frequency of an inverter are not considered, only the number n of the SVPWM modulation waves in each section is considered, regular sampling is carried out on modulation signals Pk, Pk+1 and P through unit right-angle sawtooth waves with the period being pi / 3n, and a table is made; the angle ratio of a nonzero vector to a zero vector adjacent to the nonzero vector in the modulation wave is obtained by looking up the table, then the angle ratio is multiplied by a modulation period Ts and an amplitude coefficient a, and the obtained result is the Tk, Tk+1 and T0 of the SVPWM modulation period; then, the Tk, Tk+1 and T0 are used as input, Vk, Vk+1 and V0 are used as output, and a driving wave of an SVPWM modulation inverter bridge can be generated through combinational logic. According to the SVPWM modulation method, the problem that a large amount of complex computation exists in a traditional SVPWM modulation process can be solved.

Description

technical field [0001] The invention relates to a PWM modulation method, in particular to a SVPWM modulation method. Background technique [0002] Converting direct current to alternating current is called inverter, connecting the AC side to the grid is called active inverter, and connecting the load to the AC side is called passive inverter. The three-phase electricity with a phase difference of 120° on the AC side is called a three-phase inverter. Three-phase inverters can be divided into square wave inverters, modified sine wave inverters and pure sine wave inverters. [0003] Pure sine wave inverter can adopt SPWM (Sinusoidal Pulse Width Modulation, Sinusoidal Pulse Width Modulation) modulation technology and SVPWM (Space Vector Pulse Width Modulation, Space Vector Pulse Width Modulation) modulation technology. SPWM modulation technology is developed from analog technology, while SVPWM modulation technology is more suitable for digital control. Under the same conditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387
CPCH02M7/5387
Inventor 陆原胡丙辉汪周玮魏大鹏高祺李朋刘峰
Owner HEBEI UNIVERSITY
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