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 carr

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  • Single carrier PWM method for achieving stacked carrier effect
  • Single carrier PWM method for achieving stacked carrier effect

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

[0015] For the convenience of describing the principle, four stacked carriers (such as figure 1 The PWM modulation method shown) is taken as an example for description.

[0016] figure 1 It is a schematic diagram of the multi-layer carrier modulation method. figure 1 In, the number of carriers is 4, and the in-phase stacking method is adopted. The amplitude of a single carrier 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 modulating wave M(t) Indicates that the output signals obtained by comparing the carrier wave and the modulated wave are expressed as . When the carrier At the moment Instantaneous value Less than the value ...

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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...

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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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