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New method for estimating and solving harmonic emission level based on harmonic source independence

A technology of emission level and independence, which is applied in the field of harmonic emission level estimation and solution based on the independence of harmonic sources, which can solve the problems of unguaranteed estimation accuracy and poor fitting effect, and achieve accurate and fast calculation results and speed up calculation. Speed, impact-reducing effects

Inactive Publication Date: 2018-11-13
SICHUAN UNIV
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  • Application Information

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Problems solved by technology

The fluctuation amount method is estimated according to the characteristic sign of the fluctuation amount ratio, and the estimation accuracy cannot be guaranteed in some scenarios; the linear regression method is suitable for the condition that the system side and the user side are stable, and the fitting effect is not good when the fluctuation amount is large

Method used

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  • New method for estimating and solving harmonic emission level based on harmonic source independence
  • New method for estimating and solving harmonic emission level based on harmonic source independence
  • New method for estimating and solving harmonic emission level based on harmonic source independence

Examples

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Embodiment 1

[0060] Example 1: Build in Matlab such as figure 2 The PCC point equivalent circuit shown, the parameters of each element are shown in Table 1, and the harmonic impedance is solved by using the present invention. The calculation results and calculation errors are compared with other methods as shown in Table 2-Table 3.

[0061] Table 1

[0062]

[0063] Table 2

[0064]

[0065] table 3

[0066]

[0067] Wherein, in the embodiment of the present application, the establishment of the measurement data matrix in the step (A) is performed according to the following steps:

[0068] Step (A1): Assume that the sampling voltage and current are V pcc , I pcc , the number of sampling points is N; after the sampling value is averaged, the measurement data matrix A is established;

[0069]

[0070] where ΔV pcc is the voltage fluctuation at the PCC point, ΔI pcc It is the current fluctuation amount of PCC point.

[0071] Step (A2): ΔV in formula (1) pcc , ΔI pcc It...

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Abstract

The invention discloses a new method for estimating and solving the harmonic emission level based on harmonic source independence. The method comprises the following steps: step (A), sampling voltageand current values of a common coupling point in a certain period of time, and establishing a measurement data matrix by using the sampled measurement data; step (B), calculating a covariance matrix of the measurement data matrix in the step (A), simultaneously establishing another expression of the covariance matrix according to a known circuit equation, and establishing an impedance calculationequation according to the corresponding relationship between the two covariance matrix expressions; and step (C), simplifying another expression of the covariance matrix in the step (B) based on the independent characteristics of harmonic sources at both sides of a PCC point, and solving harmonic impedance by an equation set established by corresponding equality of the two covariance matrix expressions.

Description

technical field [0001] The invention relates to the field of harmonic emission level research in harmonic source positioning, in particular to a new method for estimating and solving harmonic emission levels based on the independence of harmonic sources. Background technique [0002] With the continuous development of the power grid, more and more power electronic components are connected to the power grid, and the harmonic problem caused by this has attracted more and more attention. How to quantitatively divide the harmonic responsibility of each harmonic source in the access system is to achieve The premise of intelligent management and control of power quality. [0003] The equivalent circuit method is usually used. That is, a common connection point (PCC) is selected, the system side circuit and the user side circuit at both ends of the PCC are equivalent to a harmonic voltage source and a harmonic current source, and the harmonic reference impedance of the system side...

Claims

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 徐方维舒勤彭安庆
Owner SICHUAN UNIV
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