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SVG modulating method based on PAM+PWM cascading multi-level inverter

A technology of cascading multi-level and modulation methods, which is applied in the electrical field, can solve the problems of large switching losses, achieve the effects of small switching losses, reduce voltage and current distortion rates, and improve control accuracy and response speed

Inactive Publication Date: 2013-12-18
SHANGHAI JIAO TONG UNIV +2
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Problems solved by technology

However, in the PWM modulation method, the switching device operates at a switching frequency of hundreds or even thousands of hertz, and its switching loss is relatively large.

Method used

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  • SVG modulating method based on PAM+PWM cascading multi-level inverter
  • SVG modulating method based on PAM+PWM cascading multi-level inverter
  • SVG modulating method based on PAM+PWM cascading multi-level inverter

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Embodiment Construction

[0032] The SVG modulation method based on the PAM+PWM cascaded multilevel inverter of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] figure 1 A flow chart of an SVG modulation method based on PAM+PWM cascaded multilevel inverters according to a specific embodiment of the present invention; figure 2 It is a topology diagram of the cascaded SVG in the SVG modulation method based on PAM+PWM cascaded multilevel inverters according to a specific embodiment of the present invention; image 3 The PAM unit output ladder wave synthesis diagram in the SVG modulation method based on PAM+PWM cascaded multi-level inverters according to a specific embodiment of the present invention; Figure 4 It is a schematic diagram of the PWM unit control in the SVG modulation method based on the PAM+PWM cascaded multilevel inverter of a specific embodiment of the present invention; Figure 5a It is a superimposed waveform diagr...

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Abstract

The invention provides an SVG modulating method based on a PAM+PWM cascading multi-level inverter. The SVG modulating method based on the PAM+PWM cascading multi-level inverter comprises the steps that (1) PAM regulation is carried out on a PAM unit, and a step wave output by the PAM unit is made to approach a sine wave through the fundamental frequency optimizing PAM control algorithm; (2) PWM regulation is carried out a PWM unit, and feedback control is carried out on the instantaneous value of an output reactive current by means of the tracking type PWM control technique. According to the SVG modulating method based on the PAM+PWM cascading multi-level inverter, due to the fact that a PAM works under the condition of fundamental switching frequency, the switching loss is little; due to the fact that the harmonic components in the step wave output by the PAM unit are compensated by the PWM unit, the voltage and current distortion rate is effectively decreased, and quality of currents output by a device is improved; due to the fact that the currents are controlled directly, both the control accuracy and response speed are greatly improved.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to an SVG modulation method based on PAM+PWM cascaded multilevel inverters. Background technique [0002] In recent years, my country's electric power industry has developed rapidly, and large-capacity impact and interference loads are increasing day by day, posing potential threats to the stable and safe operation of the power system. However, industrial equipment based on computer control is more sensitive to power quality, which leads to higher and higher requirements for power quality on the load side. Static synchronous compensator (SVG) can improve system power factor, reduce power loss and improve power supply quality by compensating reactive power. Among them, cascaded SVG has been more and more widely used in high-voltage and large-capacity occasions due to its advantages such as large power capacity, low switching frequency, small output harmonics, and fast response s...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M7/5387H02M1/12
Inventor 郑益慧王昕李立学隋龙弟刘鑫杨雪谢宁
Owner SHANGHAI JIAO TONG UNIV
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