Control method and system of cascaded H-bridge multi-level converter

A technology of multi-level converters and control methods, which is applied to conversion equipment with intermediate conversion to AC, conversion of DC power input to DC power output, electrical components, etc., which can solve the problem of rich low-frequency harmonic content and complex modulation process , realize complex problems, and achieve the effect of simplifying the modulation process, simple module reuse, and less program changes

Active Publication Date: 2020-06-05
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +1
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Problems solved by technology

Among them, the control principle of multi-level harmonic elimination SHEPWM is that each phase of the circuit uses a sine modulation wave to compare with several triangular carriers. This control method has the disadvantage of rich low-frequency harmonic content; The principle is that the signal of each module is generated by comparing a triangular carrier and a sine wave. The sine waves of all modules are the same, but t

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  • Control method and system of cascaded H-bridge multi-level converter
  • Control method and system of cascaded H-bridge multi-level converter
  • Control method and system of cascaded H-bridge multi-level converter

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[0049] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0051] The present invention provides a control method for cascaded H-bridge multilevel converters, such as figure 1 shown, including:

[0052] 101. Determine the duty cycle according...

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Abstract

The invention relates to a control method and system of a cascaded H-bridge multi-level converter. The method comprises: determining a duty ratio according to an actual value and a target value of a controlled bus voltage; and determining a PWM pulse signal according to the duty ratio, and controlling the cascaded H-bridge multilevel converter by utilizing the PWM pulse signal. According to the technical scheme provided by the invention, the PWM pulse signal for controlling the cascaded H-bridge multi-level converter is generated by utilizing the duty ratio, and the method is simple in modulation process, relatively small in output direct current bias, high in modularization degree and relatively small in low-frequency harmonic wave.

Description

technical field [0001] The invention relates to the technical field of power electronic control, in particular to a control method and system for a cascaded H-bridge multilevel converter. Background technique [0002] Cascaded H-bridge multilevel converters have been widely used in power electronic devices such as medium-voltage inverters, static synchronous compensators (STATCOMs), new energy grid-connected inverters (UPFCs), and unified power flow controllers. [0003] At present, the conventional control methods of cascaded H-bridge multilevel converters mainly include multilevel harmonic elimination SHEPWM, carrier level phase shift CPSPWM and space vector SVPWM. Among them, the control principle of multi-level harmonic elimination SHEPWM is that each phase of the circuit uses a sine modulation wave to compare with several triangular carriers. This control method has the disadvantage of rich low-frequency harmonic content; The principle is that the signal of each module...

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Application Information

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IPC IPC(8): H02M1/00H02M3/28
CPCH02M1/00H02M3/285H02M1/0003H02M1/0067H02M1/007Y02E60/60
Inventor 郭雷李甲飞张佃青燕翚詹雄杨立王清涛
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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