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Impedance characteristic curve and transfer function fitting method for new energy power generation equipment

A technology of impedance characteristics and power generation equipment, applied in the measurement of resistance/reactance/impedance, electrical components, circuit devices, etc., can solve problems such as low efficiency, achieve high efficiency, reduce the number of measurement points, and improve acquisition efficiency.

Active Publication Date: 2021-07-09
ZHEJIANG UNIV +1
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Problems solved by technology

[0005] The research in the above literature is meaningful and effective, but it can be further improved. In this method, the impedance curve is obtained by connecting the measurement points, which means that all information about the impedance characteristics can only be obtained through the measurement points; the actual , the efficiency of this method is still relatively low and can be further improved

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  • Impedance characteristic curve and transfer function fitting method for new energy power generation equipment
  • Impedance characteristic curve and transfer function fitting method for new energy power generation equipment
  • Impedance characteristic curve and transfer function fitting method for new energy power generation equipment

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Embodiment Construction

[0041] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] The impedance characteristic curve and the transfer function fitting method of the new energy generating equipment of the present invention comprise the following steps:

[0043] (1) Set the initial measurement frequency, which is logarithmically uniformly distributed in the frequency domain.

[0044] The measurement frequency of logarithmic uniform distribution in the frequency domain can be realized in MATLAB by the following statement:

[0045] F=logspace(log 10 (f min ), log 10 (f max ),N)

[0046] Among them: logspace represents the function of generating a logarithmic uniform distribution array in MATLAB, F is the measurement frequency of the generated logarithmic uniform distribution, f min is the lower limit of the measurement frequen...

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Abstract

The invention discloses an impedance characteristic curve and transfer function fitting method for new energy power generation equipment. The method comprises the following steps: obtaining an impedance curve and a transfer function based on discrete measurement points, obtained by frequency sweeping, through a vector fitting technology; and the precision evaluation and perfection of a proper amount of fitting curves are realized by adaptively inserting measurement frequency points in multiple groups of measurement. Different from a traditional method that measuring points are connected into a line to serve as an approximate impedance curve, the method can obtain a more accurate impedance curve based on a smaller number of measuring points, so that the method has higher measuring efficiency. Besides, the impedance transfer function can be obtained at the same time, the method is suitable for small signal stability analysis of new energy power generation equipment, and a small signal impedance model of the new energy power generation equipment can be obtained through the method so as to be used for impedance stability analysis.

Description

technical field [0001] The invention belongs to the technical field of renewable energy grid connection, and in particular relates to an impedance characteristic curve and a transfer function fitting method of new energy power generation equipment. Background technique [0002] With the increasing use of renewable energy, renewable energy power generation equipment based on power electronics technology has been widely used in the power transmission of renewable energy, which brings stability problems to the renewable energy system, which is mainly caused by Insufficient stability margin of the interconnection system composed of renewable energy power generation equipment and power grid. In order to solve this problem, a stability analysis is required to evaluate the stability margin of the interconnection system, and the impedance-based stability analysis is an effective method to study the stability of the interconnection system, where the impedance model of the renewable e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38G01R27/04
CPCH02J3/00H02J3/381G01R27/04H02J2203/20H02J2300/20
Inventor 年珩李萌杨桂兴刘德福郭小龙
Owner ZHEJIANG UNIV