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A single-phase PAPF circuit modeling method considering coupling relation

A technology of coupling relationship and modeling method, which is applied in the direction of electrical digital data processing, instrumentation, calculation, etc., can solve the problems that the main circuit of single-phase PAPF is not given, the coupling relationship of various parameters is not considered, and the modeling cannot be done, so as to increase the The effect of practical value, convenient calculation and simple form

Active Publication Date: 2019-01-18
LANZHOU JIAOTONG UNIV
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Problems solved by technology

[0004] Aiming at the parameter selection of PAPF main circuit, traditional research mainly focuses on the theoretical analysis of the selection of a specific parameter and the analytic formula for its convenient calculation, without considering the coupling relationship between parameters
In addition, although some scholars have mentioned that there is a coupling relationship between the parameters of the PAPF main circuit, they have not given a single-phase PAPF main circuit parameter selection method that considers the coupling relationship of each parameter, so it cannot be based on accurate modeling

Method used

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  • A single-phase PAPF circuit modeling method considering coupling relation
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Embodiment approach

[0060] The specific implementation is as follows:

[0061]Step 1. Determine the influencing factors of the AC side inductance L:

[0062] Such as figure 2 As shown, in the case of ignoring the influence of line impedance, the voltage constraint equation that satisfies the real-time tracking capability of single-phase PAPF is obtained as shown in equation (1):

[0063]

[0064] Assuming that the power supply voltage of the single-phase PAPF circuit is an ideal sine wave, and the highest harmonic order of compensation is N=49th, then:

[0065] u s =U sm sinωt(2),

[0066]

[0067] Among them, U sm and I pmn are the amplitudes of each harmonic of the power supply voltage and the compensation current, α n Indicates the initial phase angle of the nth harmonic, and ω is the angular frequency of the power supply. At the same time, set the DC side voltage u dc The maximum and minimum fluctuations are ΔU 1 and ΔU 2 Available:

[0068] δ=(ΔU 1 +ΔU 2 ) / U d (4),

...

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Abstract

The invention discloses a single-phase PAPF circuit modeling method considering coupling relation, which comprises the following steps: obtaining the value of DC side voltage of the single-phase PAPFcircuit; Acquiring a value of the AC side inductance of the single-phase PAPF circuit; Obtaining a value of the DC side capacitance of the single-phase PAPF circuit; Based on the value of the DC-sidevoltage, modeling the value of the AC-side inductance and the value of the DC-side capacitance. By reasonably choosing the parameters of single-phase PAPF circuit, the compensation requirements underall conditions of a particular load can be met, and the form is simple, the calculation is convenient, the versatility is strong, the equipment cost can be reduced, the compensation effect can be improved and the stability of the whole system can be improved. At the same time, aiming at the coupling relationship between the parameters of the main circuit, starting from the actual operating conditions, through the MATLAB three-dimensional modeling and data optimization, a clear parameter selection method is obtained. The simulation and experimental results verify the correctness and feasibilityof the method.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a single-phase PAPF circuit modeling method considering the coupling relationship. Background technique [0002] In recent years, a large number of single-phase nonlinear power electronic devices have been used in large-scale industrial power applications such as electrified railways and electric arc furnaces, and the pollution to the power grid has become more and more serious. Single-phase parallel active power filter (PAPF) can effectively suppress grid harmonics and compensate reactive power, so it has attracted widespread attention. [0003] At present, the research on PAPF mainly focuses on three-phase PAPF equipment, and the research on single-phase PAPF is less. At the same time, the research focuses on topology, detection methods and control strategies. However, the reasonable selection of the key parameters of the PAPF main circuit is also an essential part o...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367Y02E40/20Y02E40/40
Inventor 孙立军田铭兴徐金阳张子麒
Owner LANZHOU JIAOTONG UNIV
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