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SVG Modulation Method Based on PAM+PWM Cascade Multilevel 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: 2016-08-17
SHANGHAI JIAOTONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 Modulation Method Based on PAM+PWM Cascade Multilevel Inverter
  • SVG Modulation Method Based on PAM+PWM Cascade Multilevel Inverter
  • SVG Modulation Method Based on PAM+PWM Cascade Multilevel 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 present invention provides a SVG modulation method based on PAM+PWM cascaded multi-level inverters, including the following steps: Step S1: PAM adjustment is performed on the PAM unit, and the PAM control algorithm is optimized through the base frequency, so that the The ladder wave output by the PAM unit is close to the sine wave; Step S2: Perform PWM adjustment on the PWM unit, and perform feedback control on the instantaneous value of the output reactive current through tracking PWM control technology. In the technical scheme of the present invention, since the PAM works at the fundamental switching frequency, its switching loss is small; the PWM unit compensates the harmonic component in the ladder wave output by the PAM unit, effectively reducing the voltage and current distortion rate and improving the output current of the device The quality; using the current direct control method, its 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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Patent Type & Authority Patents(China)
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 JIAOTONG UNIV