A Harmonic Source Affine Modeling Method Using Interval Monitoring Data Dimensionality Reduction Regression
A technology for monitoring data and harmonic sources, applied in harmonic reduction devices, design optimization/simulation, character and pattern recognition, etc., can solve problems such as reducing the accuracy of calculation results, difficulty in determining functions, and deviations in calculation results, etc., to achieve super Wide problem, fast convergence, high completeness effect
Active Publication Date: 2022-06-07
FUZHOU UNIV
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When using stochastic theory or fuzzy set theory to solve problems, it is necessary to know the probability density function or membership function of the uncertain parameters, but these functions are often difficult to determine in practical problems, and are often artificially set or approximated, resulting in large calculation results. deviation
Interval analysis to solve uncertainty problems can reduce the influence of human factors and improve the reliability of analysis results, but the interval width of the operation results obtained by using interval arithmetic will be larger than the actual interval width, and there is an over-width problem; in long calculation chains, This over-width problem will cause "error explosion" and greatly reduce the accuracy of calculation results
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[0070] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0071] Please refer to figure 1 , the present invention provides a harmonic source affine modeling method using interval monitoring data dimensionality reduction regression, comprising the following steps:
[0072] Step S1: obtain a harmonic voltage interval sample set;
[0073] Step S2: according to the obtained harmonic voltage interval sample set, carry out the affine expression of the principal component analysis of the interval midpoint to obtain the harmonic voltage principal component;
[0074] Step S3: based on the affine expression of the obtained harmonic voltage principal component, carry out least quadratic fitting respectively to the affine center of the harmonic source model variable and the noise source part, and identify the parameters;
[0075] Step S4: Combining affine center and noise source parameters to obtain an affine model of uncer...
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The present invention relates to a harmonic source affine modeling method using interval monitoring data dimensionality reduction regression, comprising the following steps: step S1: obtaining a sample set of harmonic voltage intervals; step S2: according to the obtained sample set of harmonic voltage intervals, Perform interval midpoint principal component analysis to obtain the affine expression of the harmonic voltage principal component; Step S3: based on the obtained affine expression of the harmonic voltage principal component, respectively affine center and noise source of the harmonic source model variable Partially perform minimum quadratic fitting and identify parameters; step S4: combine the affine center and noise source parameters to obtain an uncertain harmonic source affine model. The invention can suppress the expansion of interval arithmetic addition and subtraction operations, solve the problem of over-width, realize more accurate modeling of uncertain harmonic sources, and has high calculation efficiency and fast convergence speed when applied to harmonic power flow calculation.
Description
technical field [0001] The invention relates to the field of harmonic power flow, in particular to a harmonic source affine modeling method using dimension reduction regression of interval monitoring data. Background technique [0002] In recent years, the rapid development of renewable energy and power electronic converter technology has promoted the continuous increase of the scale of new energy development. The access of distributed new energy generation not only improves the operation mode of the power grid, but also brings new challenges to the research on the harmonic problem of the power grid. On the one hand, injecting larger inter-harmonics enhances the harmonic fluctuation of the system; on the other hand, the randomness and fluctuation of distributed new energy sources interact with the volt-ampere characteristics of nonlinear equipment, making harmonic analysis more efficient. complex. Harmonic power flow is one of the important technical support means for anal...
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IPC IPC(8): G06F30/27G06K9/62
CPCG06F18/2135Y02E40/40
Inventor 邵振国江信彬许昊铂张嫣陈飞雄
Owner FUZHOU UNIV