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NLM modulation MMC harmonic analysis method based on equal interval trigger control

A technology of trigger control and harmonic analysis, applied in harmonic reduction device, spectrum analysis/Fourier analysis, AC network to reduce harmonics/ripple, etc., can solve the problem of lack of modulation MMC modeling analysis

Active Publication Date: 2020-07-17
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

[0004] Previous studies rarely considered the discontinuity problem of actual control, and lacked the modeling analysis of the nearest level approach modulation MMC under equal interval triggering

Method used

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  • NLM modulation MMC harmonic analysis method based on equal interval trigger control
  • NLM modulation MMC harmonic analysis method based on equal interval trigger control
  • NLM modulation MMC harmonic analysis method based on equal interval trigger control

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Embodiment Construction

[0061] Below in conjunction with accompanying drawing, implementation process of the present invention is described in further detail:

[0062] The present invention is a kind of NLM modulation MMC harmonic analysis method based on equidistant trigger control, specifically comprising the following steps:

[0063] One, such as figure 1 It is a topological structure diagram of a three-phase half-bridge MMC. Each phase of it is composed of upper and lower bridge arms, a total of 6 bridge arms, and each bridge arm is composed of an inductor and N sub-modules (SM) in series. Each sub-module can be equivalent to a fully controlled switch, which can output the average capacitor voltage U c , or 0 two levels. By controlling the switch of each sub-module, a step wave is generated to approximate a sine wave. Under the nearest level approach modulation strategy, its sinusoidal modulation wave u v (t) The time expression is as follows:

[0064] u v (t)=U v sin(ω 0 t)

[0065] Am...

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Abstract

The invention discloses an NLM modulation MMC harmonic analysis method based on equal interval trigger control. The method comprises the steps of adopting a time domain analysis method, establishing aharmonic model of the MMC from the characteristics of a nearest level approximation modulation technology, decomposing step waves into the superposition of a series of rectangular waves, then utilizing the Fourier series expansion, and finally obtaining a universal differential mode phase voltage harmonic analysis expression for triggering and controlling the MMC at equal intervals. According tothe invention, only according to the five input data of a direct current side bus voltage Vdc, a carrier ratio F, a modulation ratio m, the number N of sub-modules contained in each phase of upper / lower bridge arm and an electrical angle theta 1 corresponding to the equal interval trigger control starting moment in one fundamental wave period, the content of each harmonic of the differential modephase voltage of the nearest level approximation modulation MMC under equal interval trigger control is solved, so that, from the AC side port of the MMC, the MMC can be approximately regarded as a harmonic voltage source.

Description

technical field [0001] The invention belongs to the field of harmonic analysis of power systems, and in particular relates to an NLM modulation MMC harmonic analysis method based on equal interval trigger control. Background technique [0002] With the development of the power system, more and more nonlinear components such as power electronic components and new energy sources are put into the power system, and the harmonic problem of the power system becomes more and more prominent. Modular multilevel converter (MMC), as the core technology of high-voltage DC transmission project VSC-HVDC based on voltage source converter, has broad application prospects in the field of high-voltage and high-power converters. The MMC topology is highly modular and has the advantages of low loss, small output voltage harmonic distortion, and easy expansion. On the other hand, the high-level MMC hardware circuit and its complex control structure, modulation strategy design and capacitor volt...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/01H02M7/483G06F30/20G01R23/16
CPCG01R23/16H02J3/01H02J3/36H02M7/483Y02E40/40Y02E60/60
Inventor 洪潮赵勇涂亮张野袁豪陈晓雯焦在滨李建华
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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