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Method for judging power transmission network transient voltage stability based on area rule

A technology of transient voltage stabilization and judgment method, applied in the fault location and other directions, can solve problems such as many rules, high dependence on model accuracy, and complexity, avoiding misjudgments and missed judgments, clear physical meaning, and simple implementation. Effect

Inactive Publication Date: 2013-05-01
TSINGHUA UNIV +1
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Problems solved by technology

The typical criterion of this type is to compare the electromagnetic torque and mechanical torque at the highest point of the recovery voltage in the transient process, as well as the rotor slip and critical slip to judge. There are many rules and the physical meaning is not clear enough.
Since the electromagnetic torque is related to the slip and the voltage, the relationship between the three is more complicated in the transient process. Only by comparing the torque or the slip can not completely and accurately reflect the physical nature of the motor instability or not. ; In addition, the electromagnetic torque and rotor slip are variables that can only be observed in offline calculations, and are highly dependent on the accuracy of the model, so it is not easy to promote online

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  • Method for judging power transmission network transient voltage stability based on area rule
  • Method for judging power transmission network transient voltage stability based on area rule
  • Method for judging power transmission network transient voltage stability based on area rule

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Embodiment Construction

[0039] The method for judging the transient voltage stability of the transmission network based on the area rule proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0040] (1) Use the offline load component statistical method or the online load parameter identification method to obtain the ratio K of the constant impedance load power in the transmission network load bus to the total power of the transmission network load bus Z , the statistical method of offline load components can refer to the method provided in the comprehensive load software of the American Electric Power Research Institute, and the statistics of industrial power consumption, commercial power consumption, agricultural power consumption, and residential power consumption under the load bus are different. The proportion of the total load power is calculated according to a set of comprehensive load equivalent accumulation method K Z The online load ...

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Abstract

The invention relates to a method for judging power transmission network transient voltage stability based on an area rule, which belongs to the technical field of power transmission network stability control. The method for judging comprises the steps of: calculating the motor acceleration area and deceleration area according to the active power change of a motor in a disturbed load bus, and through comparing the acceleration area with the deceleration area as well as the active power after disturbing the motor with the active power before disturbing the motor, quickly judging whether the load bus has unstable transient voltage or not. The method for judging has the advantages of clear physical meaning, simplicity in realization, accurate judging and the like; and the method is applied to online real-time monitoring and control of power transmission network transient voltage stability and can accurately and quickly judge the transient voltage stability of the disturbed load bus, so that advantages can be provided for subsequent correction control.

Description

technical field [0001] The invention relates to a method for judging the transient voltage stability of a power transmission network based on an area law, and belongs to the technical field of power grid stability control. Background technique [0002] At present, the transient voltage stability criteria of the transmission network are mainly divided into two categories: [0003] The first category: judge according to the voltage in the transient process is lower than a certain threshold for a period of time (for example: each system of the State Grid adopts "the voltage is lower than 0.8p.u. 0.75p.u. for no more than 1 second"). This type of criterion is obtained based on actual system operation experience or numerical simulation experience, and is easy to adopt and popularize in practice, and is the method adopted by most power grids at home and abroad. However, the mechanism of this method is not strong, and the reliability and accuracy vary with the system conditions a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 袁志昌陆超李立理邵广惠徐兴伟侯凯元王钢贾伟夏德明岳涵吴远志周莹马新刘家庆刘永奇李泽宇
Owner TSINGHUA UNIV
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