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Multi-level sine pulse width modulation method

A sinusoidal pulse width and multi-level technology, applied in electrical components, output power conversion devices, AC power input to DC power output, etc., to achieve good harmonic performance, improve utilization, and improve power output.

Active Publication Date: 2017-07-14
HARBIN ENG UNIV
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Problems solved by technology

The patent document with the publication number CN103490652A discloses a "carrier phase-shift pulse width modulation method", which uses half of the fundamental cycle as a unit to modulate the phase shift of the triangular carrier wave by 180° to eliminate even harmonics , but this method has only one carrier and is not suitable for modulation in multi-level technology

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Embodiment Construction

[0022] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0023] Step (1), according to the level number N of the converter, determine the waveform conversion of the carrier waveform from the isosceles triangular carrier to the stacked triangular carrier within a single carrier cycle. combine figure 1 , the specific implementation of this step includes the following steps:

[0024] 1) The isosceles triangle carrier amplitude of a single carrier cycle is N-1 divided into N-1 equal parts in the vertical direction, then the amplitude of each part is 1;

[0025] 2) Use the amplitude as 1 and the period pulse width as T in turn s The small isosceles triangle of / (2N-4) moves horizontally to the right and vertically from N-1 to 0 and then to the diagonal direction of N-1 to form a stacked multi-level triangular carrier wave;

[0026] 3) Set the period of the isosceles triangle carrier of the single carrier period as T s , ...

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Abstract

The present invention provides a multi-level sine pulse width modulation method. The method comprises: (1) according to the level number N of a convertor, determining the waveform transformation of carrier waveform in a single-carrier period from isosceles triangle carrier waves to laminated multi-level triangle carrier waves; (2) according to the level number N of the convertor, performing phase shift of 360 degrees / (N-1) of each laminated carrier wave; (3) comparing the modulation waves with the laminated carrier waves: when the modulation waves are larger than or equal to the laminated carrier waves, outputting high levels, and when the modulation waves are smaller than the laminated carrier waves, outputting low levels; and (4) outputting one way of PWM waveform when the modulation waves are compared to each carrier wave according to the step (3), and finally obtaining each way of PWM waveform. The modulation method provided by the invention can be utilized in a single-phase circuit and a three-phase circuit, has good output voltage harmonic wave performance and can effectively improve the utilization of direct voltage.

Description

technical field [0001] The invention relates to a pulse width modulation method, in particular to a multilevel sinusoidal pulse width modulation (SPWM) method. Background technique [0002] Since the performance indicators pursued by high-power converters are mainly higher power supply quality and the lowest switching frequency, the demand for modulation schemes of high-voltage high-power converters is becoming increasingly urgent. Due to the constraints of two performance indicators, power supply quality and switching frequency, modulation technology has become one of the great challenges faced by the field of multilevel converter technology. [0003] The multi-level converter carrier PWM control strategy is the direct promotion and application of the two-level carrier PWM technology in multi-level. Carrier PWM technology is mainly divided into two categories based on the processing of carrier: carrier layered pulse width modulation (LS-PWM) and carrier horizontal phase sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5395H02M1/12
CPCH02M1/12H02M7/483H02M7/5395
Inventor 张兰勇曹岸刘胜杜逸璇刘泽威耿文杰
Owner HARBIN ENG UNIV
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