Harmonic wave responsibility determining method of power system

A technology for power systems and determination methods, applied in the field of power, can solve problems such as inability to reflect the overall information of the system and inability for decision makers to provide harmonic sources and harmonic responsibilities, and achieve the effects of avoiding limitations, avoiding influence, and improving accuracy

Inactive Publication Date: 2016-05-04
国网电力科学研究院武汉能效测评有限公司 +4
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Problems solved by technology

According to the measurement standard of power quality data, a set of harmonic voltage and harmonic current data is output in each measurement interval, so the harmonic measurement data is essentially discrete sample data rather than continuous sample data, resulting in the obtain...

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  • Harmonic wave responsibility determining method of power system
  • Harmonic wave responsibility determining method of power system
  • Harmonic wave responsibility determining method of power system

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Embodiment Construction

[0045] The invention proposes a method for determining the harmonic responsibility of a power system, aiming at the deficiency that the discrete harmonic responsibility cannot reflect the overall information of the system. The method includes the following steps:

[0046] Step 1: Calculate the probability density function of the harmonic voltage responsibility sample by using the kernel density estimation method;

[0047] Step 2: Sampling the probability density function generated in step 1 by the importance sampling Monte Carlo method;

[0048] Step 3: Based on the sampled harmonic voltage responsibilities, calculate the statistical characteristics such as the mean and standard deviation of the harmonic source harmonic voltage responsibilities;

[0049] In step 1, the kernel density estimation method is used to calculate the probability density function of the harmonic voltage responsibility sample. assuming x l (l=1,...,n) is the harmonic voltage responsibility of the lth...

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Abstract

The invention relates to a harmonic wave responsibility determining method of a power system. The method comprises that a kernel density estimation method is used to calculate the probability density function of a harmonic voltage responsibility sample; a significant sampling Monte Carlo method is used to sample the calculated probability density function; and the mean value and standard deviation of the harmonic voltage responsibility of a harmonic wave source are calculated on the basis of the sampled harmonic voltage responsibility, and the harmonic voltage responsibility of an electric energy quality pollution source is described quantitatively. According to the invention, the harmonic wave responsibility of the harmonic wave source is visually described by utilizing the statistical features, the significant sampling Monte Carlo method is used to sample the calculation result of the harmonic wave responsibility in the calculation process, a series of discontinuous calculation results are extended, restriction of a traditional sampling method is avoided, more extracted sample points are from the area of high probability density on the premise that the sample expectation is not changed, influence of low probability emergent events on the calculation result is effectively avoided, and the accuracy of the calculation result is improved.

Description

technical field [0001] The invention relates to a method for determining the harmonic voltage responsibility of a power quality pollution source in a power system, which belongs to the field of electric power technology. Background technique [0002] The key problem to be solved in the new round of power system reform is to restore the commodity attribute of electric energy and form a mechanism for the market to determine the price of electricity. As a commodity, electric energy must reflect high quality and high price in the transaction, which prompts the power supplier to further improve the quality of electric energy. To clarify the responsibility of power quality pollution sources is the premise of improving power quality, and the determination of harmonic responsibility is a major issue. [0003] The research on traditional harmonic liability focuses on discussing the rationality of the harmonic liability measurement index, and on this basis, studies the specific calcu...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 肖楚鹏华回春邱泽晶许朝阳丁胜陈小飞
Owner 国网电力科学研究院武汉能效测评有限公司
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