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Pulse width modulation method for modularization multi-level converter

A modular multi-level, pulse width modulation technology, applied in the field of power systems, can solve the problems of limited application, achieve high utilization rate, simple engineering implementation, and improved utilization rate

Active Publication Date: 2013-03-20
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the modulation wave of carrier phase-shift PWM is sine wave, and the DC bus voltage utilization rate is only 86.6%, which limits its application in high-voltage and high-power occasions

Method used

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Embodiment Construction

[0044] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045]The modular multilevel converter MMC is composed of three-phase six bridge arms; each bridge arm includes N sub-modules and an AC reactor in series; the sub-module includes two insulated gate bipolar transistors IGBT and their anti-parallel diodes Composed of half-bridge structure and capacitor; half-bridge structure and capacitor in parallel; one of the insulated gate bipolar transistor IGBT and its anti-parallel diode is called upper switch 1, and the other insulated gate bipolar transistor IGBT and its anti-parallel diode It is called the lower switch tube 2.

[0046] Such as Figure 4 as shown, Figure 4 It is a working flowchart of a pulse width modulation method for a modular multilevel converter provided by the present invention, and the method includes the following steps:

[0047] A. Generate a three-ph...

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Abstract

The invention belongs to the field of electrical power systems, and particularly relates to a pulse width modulation method for a modularization multi-level converter. The modularization multi-level converter (MMC) is composed of three phases and six bridge arms, each bridge arm comprises n sub-modules and an alternating current reactor, and the n sub-modules are successively connected in series. Each sub-module comprises two insulated gate bipolar translator (IGBT), a half-bridge structure and a capacitor, anti-parallel diodes of the IGBT constitute the half-bridge structure, and the half-bridge structure is connected with the capacitor in parallel. The pulse width modulation method includes the following steps: A three-phase saddle-shaped modulating waves are produced; B the saddle-shaped modulating waves and triangle carrier waves are compared to produce pulse-width modulation (PWM) signals; and C the PWM signals are used for controlling the MMC. The method has the advantages of achieving on-line computation easily, achieving engineering simply, being high in direct voltage use ratio, being capable of reducing the quantity of modules in the same voltage power level, and capable of lowering cost, and being obvious in effect when volume is large.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a pulse width modulation method for a modular multilevel converter. Background technique [0002] Modular multilevel converter (MMC) is a new type of topology using multiple sub-modules connected in series. Each phase bridge arm is divided into upper bridge arm and lower bridge arm. The upper and lower bridge arms are respectively composed of N identical The sub-module and an AC reactor are connected in series in sequence. Each sub-module consists of a half-bridge structure composed of two insulated gate bipolar transistors (IGBTs) and their antiparallel diodes, and a capacitor connected in parallel. Each sub-module is a two-terminal device that can switch between full-block voltage and zero-block voltage in both current directions simultaneously. [0003] Modular multilevel converter (MMC) avoids the technical difficulty of connecting devices in series, and the output ...

Claims

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Application Information

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IPC IPC(8): H02M7/49
Inventor 王轩闫殳裔宿剑飞汪扬王宇红包海龙
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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