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Single carrier PWM method for achieving stacked carrier effect

A modulation method and carrier modulation technology, applied in the direction of pulse duration/width modulation, etc., can solve the problems of increasing the trigger delay and affecting the response speed of the device, and achieve the effect of improving the response speed and reducing the switch trigger delay.

Inactive Publication Date: 2014-01-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] The purpose of the present invention is to propose a single-carrier PWM modulation method that realizes the stacked carrier effect, and solves the problem that multi-layer stacked carrier PWM modulation requires multiple carriers and multiple comparison operations at the same time, which increases the trigger delay and affects the response speed of the device. The problem

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  • Single carrier PWM method for achieving stacked carrier effect

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Embodiment Construction

[0014] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0015] For the convenience of describing the principle, four stacked carriers (such as figure 1 Shown) PWM modulation method as an example to illustrate.

[0016] figure 1 It is a schematic diagram of multi-layer stacked carrier modulation method. figure 1 Among them, the number of carriers is 4, and the method of in-phase stacking is adopted. The single carrier amplitude is A, and the carrier labels are set to -2, -1, 1, 2 respectively. ( i =-2,-1,1,2) means carrier i at the moment t The instantaneous value of the modulated wave with M(t) Indicates that the output signals obtained by comparing the carrier wave with the modulating wave are expressed as . When the carrier at the moment The instantaneo...

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Abstract

The invention discloses a single carrier PWM method for achieving a stacked carrier effect and belongs to the technical field of electric system control. According to the technical scheme, a reference carrier signal and a modulating wave are generated at first; an instantaneous value of the modulating wave in each moment is divided by a reference carrier amplitude value to obtain a round number, the serial number of the carrier which has an intersection point with the modulating wave during equivalent adopting of stacked carriers is obtained, then instantaneous values of the carriers are made to be equivalent through longitudinal horizontal movement of a reference carrier and are compared with the instantaneous value of the modulating wave, and an output signal is obtained. According to the single carrier PWM method, the modulating effect of the stacked carriers with any number can be achieved conveniently with only one reference carrier, only one time of comparison operation between the carrier and the modulating wave needs to be executed for every moment, computation delay of a controller is effectively reduced, and output waveform quality and the response speed of a device are improved.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a single-carrier PWM modulation method for realizing the stacked carrier effect. Background technique [0002] The carrier modulation method is one of the PWM control methods of the multilevel converter, including the carrier phase shifting method and the carrier stacking method. The carrier phase shifting method is a relatively mature modulation method, but the angle of each carrier phase shift is generated by giving a certain time lag. Due to the delay of the controller, a certain error will occur, especially when the level number is high. If the moving angle is very small, it will seriously affect the output waveform quality of the converter. The implementation of the carrier stacking method is simple. At the same time, it is only necessary to superimpose a certain amount of vertical movement on the basis of the reference triangular carrier. It is onl...

Claims

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Application Information

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IPC IPC(8): H03K7/08
Inventor 肖湘宁陈甜妹郭春林杨琳张剑罗超
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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