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Online transient stability analysis method based on concise expression form of electromagnetic power of single generator in multi-machine power system

An electromechanical power system, electromagnetic power technology, applied in information technology support systems, electrical components, circuit devices, etc., can solve the problem of difficult to achieve forward cluster and backward cluster division

Inactive Publication Date: 2010-08-04
HUNAN UNIV
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  • Abstract
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Problems solved by technology

However, this method needs to dynamically divide the forward cluster and the backward cluster, and the division of the forward cluster and the backward cluster is very difficult to realize

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  • Online transient stability analysis method based on concise expression form of electromagnetic power of single generator in multi-machine power system
  • Online transient stability analysis method based on concise expression form of electromagnetic power of single generator in multi-machine power system
  • Online transient stability analysis method based on concise expression form of electromagnetic power of single generator in multi-machine power system

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Embodiment 1

[0064] In this embodiment, the method of ex post evaluation and predictive evaluation is used to evaluate the stability margin of the system. For the unstable situation, the post-assessment is based on the simulation results to obtain the angular velocity of the generator at the moment of fault removal or the moment of stable equilibrium point, and to study the angular velocity of the generator at the moment of unstable equilibrium point, and calculate the corresponding stability margin. For the steady case, the ex-post evaluation is based on the simulated study generator reaching the maximum power angle The previous power angle curve data fitting is used to obtain the power angle curve between the maximum power angle point and the unstable equilibrium point, and the corresponding stability margin is calculated by using the relevant calculation formula proposed by the present invention. The so-called predictive evaluation is to use the current power corner point The previou...

Embodiment 2

[0090] The first fault in the IEEE17 computer system test was a three-phase short circuit at the branch 75-9 near node 75, and the faulty line was cut off in 0.356 seconds. rocking curve such as Figure 4 shown. After the fault is removed, the first pendulum of the system is stable, but the second pendulum loses stability. Using the data of 0.1 second after fault removal, the simple power angle curve of a single generator and the predicted one-pendulum stability margin of a single generator are obtained by fitting, as shown in Table 8. As the sampling time approaches the maximum rotor angle time, the predicted stability margin of a single generator gets closer and closer to the stability margin obtained from the post-hoc evaluation shown in Table 9. The predicted stability margin of the second pendulum of the generator at node 130 is negative, and the system loses stability, which is consistent with the simulation situation.

[0091] Table 8: The sample time is the single g...

Embodiment 3

[0097] A power system has 584 nodes, 531 loads, 87 generators and 1284 branches. A three-phase short circuit occurred on line 463 near the EGBZ2 side between EGBZ2 and EGBZ3 nodes, and the fault was cleared within 0.2 seconds. After the fault is removed, the pendulum stability margins of the four critical clusters are obtained by using the method of the present invention, as shown in Table 10. In the table, UEP1 is the unstable equilibrium point predicted by the sample time of 0.2-0.3 seconds. The predicted stability margin is obtained by using the predicted evaluation method based on the fitted single generator power angle curve. UEP2 is an accurate unstable equilibrium point obtained by time-domain simulation, but because the generator pendulum on node 196 is stable, its UEP2 is obtained by solving the power angle curve and prime mover power balance. The generator single generator stability margins at nodes 190, 191 and 193 are obtained from the rotor speed of the generator...

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Abstract

The invention discloses an online transient stability analysis method based on a concise expression form of electromagnetic power of a single generator in a multi-machine power system. Electromagnetic output power of any single generator in the power system is a multivariable nonlinear function of all generator load angles or a multivariable nonlinear function of a slip between all generator load angles and an inductor rotor, which is known by analyzing the traditional power system. A concise expression form of the electromagnetic output power of any single generator in the complex power system is obtained through expanding a Taylor series; a load angle swinging curve of a multi-machine power system and an electromagnetic power curve are obtained through time domain simulation, and a coefficient in a high-order polynomial function is obtained by using data fitting; the load angle curve obtained through the fitting is extended to obtain a predictive load angle curve of a future moment, and the stability margin of the single generator in the multi-machine system and the system can be obtained by using the obtained concise expression form of the single generator load angle curve. The invention can be used for the online transient stability analysis of the large-scale power system.

Description

technical field [0001] The invention relates to a transient stability analysis technology of a power system, in particular to a simple expression method of electromagnetic power of a single generator in a multi-machine system and its application in the online analysis of the transient stability of a power system. Background technique [0002] Power system stability analysis has achieved a lot of research results in finding power system stability margin and instability mechanism. [0003] In terms of analysis methods, there are mainly transient energy function method, numerical simulation method and hybrid method combining the two. The energy function method also includes the energy function method based on the potential energy boundary method and the related unstable equilibrium point method, the extended equal area method (EEAC and SIME), the single generator equal area method (SGEAC) and other methods. The advantage of time-domain simulation is that it can consider any co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 吴政球
Owner HUNAN UNIV
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