Method and device for aggregation calculation of power grid frequency coupling impedance model in static coordinate system
A static coordinate system, coupled impedance technology, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electrical variables, etc., can solve the problems of complex frequency coupling impedance network aggregation process and no detailed method for impedance network aggregation.
Active Publication Date: 2021-10-26
TSINGHUA UNIV +1
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[0004] Among them, if the frequency coupling effect of power electronics networking equipment is considered, the impedance of each power networking equipment should be modeled as a two-dimensional matrix, and the aggregation process of the frequency coupled impedance network is relatively complicated. Currently, there is no impedance network aggregation for this situation. detailed method
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[0043] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0044] In order to facilitate the understanding of the present invention, before explaining the grid frequency coupling impedance model aggregation calculation method in the static coordinate system of the embodiment of the present invention, first define the calculation frequency coupling impedance model equation of networked equipment, which is defined as follows:
[0045]
[0046] Wherein, the frequency coupling impedance model matrix corresponding to the networking equipment is a two-dimensional matrix Z.
[004...
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The present invention proposes a grid frequency coupling impedance model aggregation calculation method and device in a static coordinate system, including the following steps: obtaining each frequency coupling impedance model matrix corresponding to each networked device; aggregating each frequency coupling impedance model matrix through a preset formula Target node, get the target frequency coupling impedance model matrix. Therefore, the calculation method of frequency coupled impedance model aggregation in the power grid is given, which provides a theoretical basis for the aggregation of complex frequency coupled impedance network models, and realizes judging the system stability according to the frequency characteristics of the target frequency coupled impedance model matrix, thereby improving the system stability. Accuracy of stability judgments.
Description
technical field [0001] The invention relates to the technical field of power distribution systems, in particular to a method and device for aggregation calculation of power grid frequency coupling impedance models in a static coordinate system. Background technique [0002] In recent years, a large number of renewable energy power generation systems based on power electronic converters have been connected to the grid, which has brought challenges to the modeling and analysis of power systems. The impedance model method is widely used in the grid-connected stability analysis of renewable energy generation systems due to its simple modeling, modularization, and clear physical meaning. [0003] Usually, when analyzing a large-scale renewable energy generation grid-connected system with a complex topology, it is first necessary to model the impedance of each link in the complex system to obtain its impedance model; then, according to the topology of the system, connect the imped...
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IPC IPC(8): G01R27/08G06M1/27G06F17/16
CPCG01R27/08G06F17/16G06M1/27
Inventor 谢小荣刘威亢朋朋王衡
Owner TSINGHUA UNIV