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Specific inter-harmonic optimized pulse width modulation method based on frequency modulation

一种脉冲宽度调制、频率调制的技术，应用在脉冲持续时间/宽度调制、交流网络以减少谐波/纹波、仪器等方向，达到降低功率设计容量、提升电能质量的效果

Active Publication Date: 2019-05-31
WUHAN UNIV
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Problems solved by technology

The control objectives of the current related studies have not directly considered the inverter unit as a direct regulation unit for inter-harmonic suppression, and the research on the compensation of specific inter-harmonics through amplitude modulation and phase modulation has not been reported.

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  • Specific inter-harmonic optimized pulse width modulation method based on frequency modulation
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  • Specific inter-harmonic optimized pulse width modulation method based on frequency modulation

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Embodiment Construction

[0039] According to the technical solution, the specific implementation manner of the present invention is further described in detail.

[0040] The present invention provides a specific interharmonic amplitude modulation and phase modulation control method based on frequency modulation, comprising the following steps:

[0041] (1) Select the specific interharmonic to be controlled, and obtain its amplitude and phase information. The specific method is as follows:

[0042] Select a specific inter-harmonic that is the most harmful and difficult to control in the power grid, and use the inter-harmonic detection method to obtain the amplitude and phase information of the inter-harmonic.

[0043] (2) Select an appropriate modulation waveform frequency, such as selecting a specific characteristic harmonic (3n+1 / 3n-1 harmonic) output by a power PWM inverter adjacent to the control target inter-harmonic frequency as the modulated harmonic ( Taking the output of a single-phase PWM in...

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Abstract

The invention provides a specific inter-harmonic optimized pulse width modulation method based on frequency modulation. The method comprises constructing and successively synthesizing r PWM fundamental wave periodic waveforms, and successively linearly modulating the initial phase of a specific harmonic in each fundamental period to achieve frequency modulation so as to accurately control the amplitude and phase of the inter-harmonic. Firstly, an optimized PWM method for specific harmonic amplitude modulation and phase modulation is provided, and then one or more related harmonic spectra are relocated to an inter-harmonic spectrum to be controlled, thereby realizing direct control of inter-harmonic frequency modulation, amplitude modulation and phase modulation.

Description

technical field [0001] The invention relates to the field of interharmonic suppression in power systems, in particular to a specific interharmonic pulse width modulation method based on frequency modulation. Background technique [0002] With the increasing development of power electronics technology and the widespread application of new energy grid-connected systems, a large number of nonlinear loads are connected to the grid, and the problem of harmonics and interharmonics has become particularly prominent. Interharmonics in the power system will cause voltage fluctuations and flicker, subsynchronous oscillation, damage to power equipment and other hazards, reducing the stability of the power system. Therefore, there is an urgent need to model and analyze various inter-harmonic sources, detect harmonics and inter-harmonics in the power grid, and propose corresponding technical measures to suppress inter-harmonics. [0003] The current research on the suppression of inter-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH03K7/08G02F1/37Y02E40/40
Inventor 张慧何怡刚刘开培郭宇铮程永光谢杰徐磊廖俊张照林余宙
Owner WUHAN UNIV
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