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Method for rapidly assessing sub-synchronous resonance of complex AC/DC interconnected system comprising multiple series compensation

A subsynchronous resonance, interconnected system technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of time and energy consumption, save time for evaluation, and achieve the effect of easy implementation

Inactive Publication Date: 2010-06-02
SICHUAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For a complex large system with multiple series compensations, if the electromagnetic transient model of the entire system is completely built, and the above method is directly used for subsynchronous resonance analysis, it will consume a lot of time and energy

Method used

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  • Method for rapidly assessing sub-synchronous resonance of complex AC/DC interconnected system comprising multiple series compensation
  • Method for rapidly assessing sub-synchronous resonance of complex AC/DC interconnected system comprising multiple series compensation
  • Method for rapidly assessing sub-synchronous resonance of complex AC/DC interconnected system comprising multiple series compensation

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Experimental program
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Embodiment

[0037] 1. Selection of series compensation and thermal power units to be studied

[0038] Subsynchronous resonance refers to a state of energy exchange between the power grid and the turbine generator system at one or more frequencies lower than the synchronous frequency of the system. The main assessment is the thermal power unit adjacent to (or close to) the series compensation , and there is no thermal power unit around the series compensation or the series compensation that is too far away from the thermal power unit is not selected.

[0039] The turbo-generator set that needs to be studied for subsynchronous resonance should meet the following conditions: the distance between the turbo-generator set and the AC power grid is weak, the rated power of the turbo-generator set and the rated power delivered on the same order of magnitude. Theoretical analysis and practical experience show that subsynchronous resonance basically only involves large-capacity turbogenerators, and...

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Abstract

The invention discloses a method for rapidly assessing a sub-synchronous resonance of a complex AC / DC interconnected system comprising multiple series compensation. The method is characterized in that: in a system where a plurality of series compensations simultaneously exist, the theory of a two-point method is utilized to carry out effective and equivalent simplification on a vast AC / DC interconnected system network to rapidly obtain a plurality of simplified system networks; each simplified system comprises the single series compensation or the adjacent series compensation; and a frequency scanning method is combined to analyze each simplified power system model to obtain a curve that a real part and an imaginary part of a sub-synchronous equivalent impedance change along with the frequency so as to rapidly assess whether the system has a danger that the sub-synchronous resonance occurs or not.

Description

technical field [0001] The invention relates to a method for quickly evaluating subsynchronous resonance of a complex AC-DC interconnection system with multiple series compensation, belonging to the field of long-distance AC power transmission. Background technique [0002] Subsynchronous resonance (SSR) is a special oscillation mode that is extremely harmful to power systems, and its frequency is 5-45Hz. On long-distance AC transmission lines, series compensation capacitors are an economical and practical measure to improve stability and power transmission capacity. However, when the natural frequency of the electrical resonant circuit formed by the series compensation transmission network is complementary to the natural frequency of the torsional vibration of the turbogenerator shafting, mutual excitation will occur between the two. [0003] The harm of subsynchronous resonance is manifested in the occurrence of electromechanical transient oscillation on the side of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 李兴源杨煜黎小林穆子龙刘建王渝红
Owner SICHUAN UNIV
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