A method for transiently stable network equations based on holomorphic embedding
A network equation and transient stability technology, applied in the field of power system, can solve problems such as the difficulty of model selection and calculation of transient characteristics that cannot be solved
Active Publication Date: 2022-06-07
STATE GRID NINGXIA ELECTRIC POWER CO +1
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None of the above methods can solve the problem of difficult selection and calculation of transient characteristic models in systems with nonlinear loads
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[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0044] Differential-network equations need to be solved alternately in power system transient stability simulation analysis. The network equation has the characteristics of large-scale nonlinearity and is the core technology of transient stability simulation analysis.
[0045] see figure 1 , a flowchart of a holomorphic embedding-based transient stable network equation method disclosed in this embodiment. It includes the following st...
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The invention provides a transient stability network equation method based on holomorphic embedding, which includes taking the node voltage equation and the generator voltage equation containing nonlinear load represented by the real part and the imaginary part, and combining the two to eliminate the grid current , to obtain the nonlinear network equation; introduce the holomorphic embedded factor into the nonlinear network equation, so that the voltage variable to be obtained in the nonlinear network equation is a holomorphic function about the holomorphic embedded factor; according to the holomorphic function form nonlinear network equation Calculate the virtual current expansion items of the generator, and obtain the coefficients of the voltage variables one by one; select the numerical approximation method, and restore the voltage variables according to the coefficients of the voltage variables. The present invention can solve the problem that the load current is not synchronous in time when the load is constant power. By solving the linear equations of the same coefficient matrix multiple times, the coefficients of the expansion items of the analytical expression of the target variable are obtained to restore the target variable, avoiding the need to solve non-linear equations. problem with linear systems.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a transient stable network equation method based on holomorphic embedding. Background technique [0002] In most cases, the transient stability of power system is solved and analyzed step by step using numerical integration method, which is widely used in offline simulation software and online evaluation system. In the time dimension, it can simulate the dynamic process of the generator, the disconnection of the line in the power grid, etc., and realize the transient stability calculation by alternately solving the rotor motion equation and the network equation. However, the calculation is generally time-consuming, and it is difficult to meet the requirements of real-time decision-making. For systems including wind power, photovoltaics, converter stations and other nonlinear loads, there are problems in the selection and calculation of transient characteristic models. The ...
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IPC IPC(8): G06F17/11G06Q50/06H02J3/00G06F113/04
CPCG06F17/11G06Q50/06H02J3/00G06F2113/04H02J2203/20Y02E60/00
Inventor 摆世彬甘德强田志浩李思儒孙小湘鲍威蒙金有刘刚
Owner STATE GRID NINGXIA ELECTRIC POWER CO