Method for analyzing stability of power system by considering change characteristic of load

A technology of power system and load change, applied in the field of power system, can solve problems such as system stability deterioration, error, system collapse, etc., and achieve the effect of improving the level of stable operation

Active Publication Date: 2010-01-13
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

In the actual system (especially in the transient process after the system is disturbed), it is difficult to change the load according to the constant power factor. The equivalent impedance of the load node is equal to the Thevenin equivalent impedance of the node network as the critical criterion for voltage stability. There will be a large error
[0005] In the on-line operation analysis and control of the power system, from the exi...

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  • Method for analyzing stability of power system by considering change characteristic of load
  • Method for analyzing stability of power system by considering change characteristic of load
  • Method for analyzing stability of power system by considering change characteristic of load

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Embodiment Construction

[0084] Such as Figure 5 In the 3-machine 10-node system shown, the bus 7 is a constant impedance load, and the bus 10 is an 80% induction motor + 20% constant impedance load. The induction motor parameters are: constant mechanical torque, stator resistance R 1 =0.5pu, stator reactance X 1 =0.02pu, rotor resistance R 2 =0.02pu, rotor reactance X 2 =0.145pu, and excitation reactance X μ = 3.3pu. At 0 seconds, the 1-time connection line between node 5 and node 6 is disconnected. After adopting the above-mentioned method of the present invention to analyze, the power angle curve and the voltage curve of the system after the fault are as follows Figure 6 , Figure 7 shown. It can be seen that the voltage instability occurs in the system after the fault. To verify the rationality of the present invention, take the following verification steps:

[0085] Step 1: Calculate the Thevenin equivalent potential and Thevenin equivalent resistance of the system in the post-fault t...

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Abstract

The invention provides a method for analyzing the stability of a power system by considering the change characteristic of a load. System instability can be differentiated to belong to angle instability, voltage instability or induction motor instability by the method when load voltage is greatly reduced after a fault appears. Particular for the voltage instability, because the change characteristic of the load is an important factor which influences the voltage stability after the fault, the method can consider the voltage stability of the system of different load change characteristics. The method can judge the instability essence of the power system under different load change characteristics after the fault appears, can be applied to the stability analysis and the operation control of the power system and is beneficial to system operation and an analyst to analyze the property of the system after the fault, thus the analyst can take an effective safety control measure to improve the stable operation level of the power system.

Description

technical field [0001] The invention relates to a method for power system stability analysis and belongs to the field of power systems. Background technique [0002] Power system stability refers to the ability of the power system to maintain stable operation after being disturbed by accidents. Among them, the research on power angle stability has been relatively mature, and a relatively complete analysis and control system has been formed. However, the research on voltage stability is still in the development stage from the concept to the analysis method, and the corresponding research work is far from being mature. At present, the stability problem of the induction motor has been raised in the academic circles, and the research on the stability problem will continue to be deepened. [0003] At present, there is no unified standard for the criterion of voltage instability. The standard used in engineering in my country is to judge according to the magnitude and duration o...

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Application Information

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IPC IPC(8): G01R31/00H02J3/00H02J3/12H02J3/24
Inventor 汤涌林伟芳孙华东易俊仲悟之张鑫邵瑶
Owner CHINA ELECTRIC POWER RES INST
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