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Boundary Identification Method for Subsynchronous Resonant Practical System Modeling

A technology of subsynchronous resonance and actual system, applied in the field of power system, can solve the problems such as the inability to directly calculate the strength of the subsynchronous resonance effect, and the inability to directly determine the modeling boundary of the actual system subsynchronous resonance at one time, so as to improve the accuracy effect on the efficiency of the modelling

Active Publication Date: 2017-10-20
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] In order to overcome the deficiency that the existing technology cannot directly calculate the strength of each power element in the actual system on the subsynchronous resonance of the actual system and cannot directly judge the subsynchronous resonance modeling boundary of the actual system at one time

Method used

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  • Boundary Identification Method for Subsynchronous Resonant Practical System Modeling
  • Boundary Identification Method for Subsynchronous Resonant Practical System Modeling
  • Boundary Identification Method for Subsynchronous Resonant Practical System Modeling

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Embodiment

[0044] In this embodiment, the improved New Zealand IEEE10 unit 39-node system model is used for subsynchronous resonance modeling, and two parallel IEEE first benchmark model generator sets are connected at node 41, where the transmission line impedance parameter between nodes 40 and 41 is 0.00112+ j0.03856pu, the impedance between nodes 40 and 39 is 0.02079pu. Focus on the SSR problem of two generators connected at node 41, the modeling method steps are as follows:

[0045] Step 1: Inject the unit current with a frequency range of [0,120]Hz and an interval of 0.0001Hz into the voltage equation of the system node at the node of the system research unit, and the injection current of other system nodes is 0, and calculate the driving point impedance at the node of the research unit: Z(ω)=R(ω)+jX(ω)=U, where: ω=2πf is the angular frequency; Z(ω) indicates that when the injected unit current frequency is ω, when the node of the research unit looks into the system, etc. X(ω) is t...

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Abstract

The invention discloses a method for identifying the modeling boundary of a subsynchronous resonance actual system, which comprises the following steps: injecting a unit current of a certain frequency range into the voltage equation of the system node at the node of the system research unit, and the injection current of other system nodes is 0, through Calculate the driving point impedance to search for the natural resonant frequency of the driving point impedance of the system and the equivalent resistance value of the driving point at this frequency. Then calculate the sensitivity factors I1 and I2 of each power element respectively; divide each power element in the system into three categories, and expand the research area composed of the first type of power elements to the outside by one node to determine the subsynchronous resonance of the actual system Modeling area and modeling boundary; through the defined subsynchronous resonance frequency sensitivity factor of power components and the impedance sensitivity factor of power components, the specific subsynchronous resonance boundary of the actual system is determined, which improves the accuracy of identifying subsynchronous resonance boundaries and modeling s efficiency.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a modeling boundary identification method of a subsynchronous resonance actual 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-scal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 陈武晖董德勇毕天姝
Owner JIANGSU UNIV
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