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Method for optimally controlling influences among harmonic sources and power quality of smart grid

A multi-harmonic source and optimal control technology, applied to the AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as not considering mutual influence, so as to promote the practical process and improve safety and stability running effect

Active Publication Date: 2010-10-27
湘能楚天电力科技有限公司
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Problems solved by technology

The traditional power quality optimization configuration does not consider the resonance among various power sources in the smart grid and the mutual influence of harmonic amplification, and the characteristics of diversity, attenuation, and correlation of harmonics.

Method used

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  • Method for optimally controlling influences among harmonic sources and power quality of smart grid
  • Method for optimally controlling influences among harmonic sources and power quality of smart grid
  • Method for optimally controlling influences among harmonic sources and power quality of smart grid

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Embodiment Construction

[0012] The specific algorithm steps in the accompanying drawings: carry out conditional constraints on the harmonics of each k branch to obtain the branch with the smallest voltage distortion rate; obtain the harmonic interaction between the branches with the smallest voltage distortion rate Influence condition constraints, and then obtain the branch with the smallest voltage distortion rate; and so on until the optimal value is obtained, so as to obtain the optimal decision. Considering the current as a function of the voltage distortion rate, first set the initial value of the voltage distortion rate. The initial value can be obtained by traditional qualitative current spectrum method without considering the influence of harmonic diversity and attenuation. Inject the current adjusted by formula (4) into the system, and use the node voltage equation to obtain a new harmonic voltage of the system. A new voltage distortion rate value will be set and a new adjusted current will...

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Abstract

The invention discloses a method for optimally controlling influences among a plurality of harmonic sources and the power quality of a smart grid. In the method, for the phenomena of resonance and harmonic amplification among a plurality of power supplies in the smart grid, and the characteristics of the diversity, attenuation property, correlation and the like of harmonic waves, current is represented as a function for a voltage distortion factor and is adjusted according to the characteristics of the harmonic sources to restrict the voltage distortion factor, and the optimal distribution ofpower quality adjustment devices is determined in terms of security, economical efficiency and environmental protection based on a dynamic current plan model to eliminate harmonic superposition and voltage fluctuation so as to realize the optimization of system performance and obtain expected stability and power quality. The method has the advantages of effectively improving the harmonic pollution of the smart grid and providing required power quality for the establishment of the strong smart grid, and also can be applied in the fields of metallurgy enterprises, electric locomotives, aerospace, shipping and the like to promote the industry upgrading of the whole society.

Description

technical field [0001] The invention relates to a method for mutual influence among multiple harmonic sources of a smart grid and dynamic optimal control of power quality. The optimal distribution of power quality adjustment devices is determined to eliminate harmonic superposition and voltage fluctuation, so as to optimize system performance and achieve desired stability and power quality. It will effectively improve the harmonic pollution of the smart grid and provide the required power quality for the construction of a strong smart grid. At the same time, the research results can also be applied to metallurgical enterprises, electric locomotives, aviation ships and other fields to drive the industrial upgrading of the whole society. Background technique [0002] With the requirements for environmental protection, energy saving and emission reduction, and sustainable development, as well as the gradual improvement of customers' requirements for power quality, distributed p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 夏向阳徐林菊
Owner 湘能楚天电力科技有限公司
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