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An NLM Modulated MMC Harmonic Analysis Method Based on Equal Interval Trigger Control

A technology of trigger control and harmonic analysis, applied in harmonic reduction devices, 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: 2021-07-23
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

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  • An NLM Modulated MMC Harmonic Analysis Method Based on Equal Interval Trigger Control
  • An NLM Modulated MMC Harmonic Analysis Method Based on Equal Interval Trigger Control
  • An NLM Modulated 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 time domain analysis method is adopted to establish the MMC harmonic model from the characteristics of the latest level approximation modulation technology, and the staircase wave is decomposed into a series of rectangles. The superposition of waves, and then the Fourier series expansion is used to obtain a general analytical expression for the differential mode phase voltage harmonics of the equally spaced trigger-controlled MMC. The invention realizes that only the DC side bus voltage V is used dc , the carrier ratio F, the modulation ratio m, the number of sub-modules N included in the upper / lower bridge arm of each phase, the electrical angle θ corresponding to the start time of the trigger control at equal intervals in one fundamental wave cycle 1 , these five input data, obtain the harmonic content of each order of the differential mode phase voltage of the differential mode phase voltage of the nearest level approximation modulation MMC under equal interval trigger control. Therefore, looking into the AC side port of the MMC, we can approximate the MMC 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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Patent Type & Authority Patents(China)
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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