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A Subsynchronous Oscillation Modeling Method for Point-to-Network Systems

A technology of subsynchronous oscillation and modeling method, which is applied in the field of power system, can solve the problem that the model cannot judge whether the modeling is reasonable by itself, and achieve the effect of reducing the number of modeling times, reducing the number of modeling times, and improving efficiency and accuracy

Active Publication Date: 2016-03-02
JIANGSU UNIV
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Problems solved by technology

[0006] In order to overcome the shortcomings that the frequency impedance scanning curve only indirectly reflects the error of the subsynchronous oscillation analysis results, and the established model cannot judge whether the modeling is reasonable by itself, the present invention proposes a method for modeling subsynchronous oscillation of the point-to-network system

Method used

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  • A Subsynchronous Oscillation Modeling Method for Point-to-Network Systems
  • A Subsynchronous Oscillation Modeling Method for Point-to-Network Systems
  • A Subsynchronous Oscillation Modeling Method for Point-to-Network Systems

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Embodiment

[0040] This example uses the improved New Zealand IEEE10 unit 39-node system model for modeling, adding a series compensation line and a 900MW generator set at the 39-node, and merging the two 39-node system models into a 78-node system model, focusing on research For the SSR problem of generator set applied at node 39, the modeling method steps are as follows:

[0041] Step 1: Take the research unit of the power system, the series-compensated transmission line, and the extended network centered on the end-point of the series-compensated transmission line as the initial modeling scale of the point-to-network system, and the equivalent voltage source at its boundary point is the impedance model to form the initial modeling model.

[0042] The described extended network is: the shortest electrical distance indirectly connected to the terminal node of the series-compensated transmission line is 3 to 6 bus node scales, and if the ring network is near the terminal node of the serie...

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Abstract

The invention provides a subsynchronous oscillation modeling method for a point-to-network system. The method includes the following steps that a research unit of an electric system, a series compensation power transmission line and an extended network with an endpoint of the series compensation power transmission line as the center serve as an initial modeling scale of the point-to-network system, boundary points of the point-to-network system are equalized to form a voltage source model after impedance, and an initial modeling model is formed; according to the formed modeling model, a subsynchronous oscillation torsional vibration modal characteristic value lambdai1 of the modeling model is obtained through a prony algorithm and is analyzed; whether parameters in the values lambdai1 are identical is judged and whether the modeling model is reasonable is determined. Modeling is carried out so that an electromagnetic transient model capable of meeting the requirement of simulation time and also meeting the demand of engineering research precision is constructed within a proper range, and efficiency and maneuverability of subsynchronous oscillation analysis are improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a subsynchronous oscillation modeling method of a point-to-network system. Background technique [0002] A large number of long-distance AC series compensation transmission projects have been put into operation, making subsynchronous oscillation one of the important factors threatening the security of my country's power grid. Many large thermal power plants such as Yimin, Suizhong, Shangdu, Baorixile, Pannan, Jinjie, Tuoketuo, Shenmu, Fugu, and Yangcheng are connected to the system through series compensation transmission lines, and there are relatively large Severe subsynchronous oscillation threat. [0003] In the face of complex large-scale power systems, it is undoubtedly the most accurate method in theory to establish a detailed electromagnetic transient model of the whole system for practical engineering research. However, large-scale electromagnetic transient simul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
Inventor 陈武晖董德勇张军
Owner JIANGSU UNIV
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