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

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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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 method for accurately predicting the initial estimated value of the generator node voltage at each integration step in the transient calculation process of the power system, so that the number of iterations of each integration step during the transient simulation calculation of the power system can be greatly increased A reduction in the magnitude, thereby greatly improving the simulation speed

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