Projection method for generator node voltage during electric power system transient stability simulation process

A generator node, transient stabilization technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of increasing the number of iterations, reducing the number of iterations, and a large amount of calculation, reducing the number of iterations and improving the speed. Effect

Inactive Publication Date: 2012-07-04
ZHEJIANG UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to solve the shortcomings of the inaccurate initial estimate of the generator node voltage during the transient stability simulation process of the power system, which increases the number of iterative solutions, the amount of calculation is large, and the calculation speed cannot meet the online calculation requirements of the power system. A...

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  • Projection method for generator node voltage during electric power system transient stability simulation process
  • Projection method for generator node voltage during electric power system transient stability simulation process
  • Projection method for generator node voltage during electric power system transient stability simulation process

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing.

[0034] A kind of generator node voltage prediction method used for power system transient stability simulation that the present invention proposes comprises the following steps:

[0035] Step 1: According to The node voltage and injection current of each generator in the system at any time, calculate the equivalent admittance of the entire external system corresponding to each generator according to the following formula:

[0036] ( is the number of generators)

[0037] In the formula, respectively Moment No. The real part and imaginary part of the generator node voltage and the real part and imaginary part of the node injection current; express time and The equivalent admittance of the entire external system to which the generator is connected;

[0038] Step 2: Apply the explicit integration formula, given by time state variables and run variable...

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Abstract

The invention discloses a projection method for a generator node voltage during an electric power system transient stability simulation process. Compared with the prior art, the generator node voltage at a next integral step time can be more accurately projected through the time generator node voltage and the correlative state variable. The basic concept adopted by the invention is that when the generator node voltage is required to be projected, the whole electric power system is separately regarded as an electric generating set and an external system represented by equivalent admittance which are connected; the system equivalent admittance outside each generator is approximately regarded as to maintain invariability in an integral step; and a time state variable estimation value is projected through an explicit integral, and the predominant value of each generator node voltage can be obtained according to an approximate system equivalent impedance corresponding to each generator andthe state variable projection value. The generator node voltage projected by the method provided by the invention serves as the initial estimation value of each integral step simulation, and the iteration frequency during the solution process can be remarkably reduced.

Description

technical field [0001] The invention belongs to power system automation, and in particular relates to a method for predicting generator node voltage in the power system transient stability simulation process. Background technique [0002] Power system transient stability analysis is one of the most basic and core contents in power system analysis and calculation. Advanced technologies such as online dynamic security analysis, security and stability emergency control, preventive control, and intelligent dispatching have been gradually required to be popularized and applied in power systems. The precondition for realizing these advanced technologies is fast, accurate and reliable transient stability simulation of large-scale power systems. [0003] Numerical integration is the most accurate and reliable method for power system transient stability simulation calculation. The biggest disadvantage of the numerical integration method is the large amount of calculation. Although ...

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Application Information

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IPC IPC(8): H02J3/00
Inventor 王建全赵志奇杨飞燕
Owner ZHEJIANG UNIV
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