Electric power system emergency control method based on response information

A power system and response information technology, applied in the direction of AC network voltage adjustment, etc., can solve the problems that the correctness of the results is difficult to guarantee, difficult to accurately grasp, etc., and achieve the effect of matching failure modes in real time

Inactive Publication Date: 2014-09-03
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0002] The current power system stability prediction and emergency control devices are still based on the calculation of power grid models and parameters. When the models and parameters do not match, the correctness of the results is difficult to guarantee
Facts have proved that it is difficult to accurately grasp the links that play an important role in the dynamic process such as the load characteristics of the large power grid and the adjustment system parameters.

Method used

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  • Electric power system emergency control method based on response information
  • Electric power system emergency control method based on response information
  • Electric power system emergency control method based on response information

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Such as figure 1 As shown, in the WEPRI36 system, the fault setting is that a three-phase short-circuit ground fault occurs between bus 31 and bus 33 near the side of bus 33, and the line is tripped in 0.19 seconds. According to the strategy table, 30% of the output of the G8 generator is cut off at 0.35 seconds. In 0.5s, it is judged that the system will be unstable, and the control quantity algorithm is started. At this time, the critical fleet (S) is G7, G8 generators, and the remaining fleets (A) are G1, G2, G3, G4, G5, G6 generators. image 3 The power angle curve of the generator relative to the center of inertia of the system at this time is given.

[0045] The inertia time constants of each generator G1-G8 are shown in Table 1.

[0046] The inertial time constants of the critical cluster, the remaining clusters, and ...

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Abstract

The invention relates to an electric power system emergency control method based on response information. Response of a generator, i.e., a power angle, an angle speed and imbalance moving kinetioity information, is detected by a wide area dynamic information system WAMS in real time, when the system is not stable, control quantity required by the system is calculated in real time. The method comprises steps that: 1, whether the system is stable is determined; 2, an unstable balance point of an equivalent single-machine infinity system is predicted, if the system has no unstable balance point, stepout instruction is emitted; 3, a target value of a first-order derivative k of the angle speed versus the power angle of the equivalent single-machine infinity system is calculated; 4, control quantity lambda of the equivalent single-machine infinity system is calculated; 5, control quantity delta Pm required by a multiple-machine system is calculated; and 6, generator cutting operation is carried out. Through the method, the response of the generator, i.e., the power angle, the angle speed and the imbalance moving kinetioity information, is detected by the wide area dynamic information system WAMS in real time, when the system is not stable, the control quantity required by the system can be calculated in real time, and a complex model of the system can be adapted to.

Description

technical field [0001] The invention belongs to the technical field of power system emergency control, and in particular relates to a response information-based power system emergency control method. Background technique [0002] The current power system stability prediction and emergency control devices are still based on the calculation of the grid model and parameters. When the model and parameters are mismatched, it is difficult to guarantee the correctness of the results. Facts have proved that it is difficult to accurately grasp the links that play an important role in the dynamic process such as the load characteristics of the large power grid and the adjustment system parameters. Stability prediction and control based on system response independent of system parameters and calculations has been the expectation for many years. With the gradual maturity of WAMS technology, it can be foreseen that in the near future various dynamics of units in the system can be obtaine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12
Inventor 张保会王怀远杨松浩郝治国
Owner XI AN JIAOTONG UNIV
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