A Digital Simulation Calculation Model and Its Algorithm for Transient Stability of Electric Power System

Abstract

The invention provides a power system transient stability digital simulation computation model and an algorithm thereof, and belongs to the field of power system digital simulation. In the traditional machine-network interface algorithm, the conversion computation of a dq axis of each generator is solved in grid node voltage algebraic equations, so that the power system simulation model becomes time variant nonlinear algebraic equations. In the invention, the conversion computation of the dq axis of each generator is solved in a simulation model of each generator set, so that the power system simulation model becomes time invariant linear algebraic equations, and a calculated amount of the power system simulation model during alternate solving is largely reduced. The power system transient stability digital simulation computation employing alternate solving is simplified, a physical significance of the model is clearer, and the programming difficulty is remarkably reduced; and the computation of the simulation model of each generator set during alternate solving is decoupling, so the practical power system transient stability digital simulation parallel computation model can be formed.

Description

technical field [0001] The invention relates to a power system transient stability digital simulation calculation model and an algorithm thereof, belonging to the field of power system digital simulation. Background technique [0002] In transient stability analysis, the general form of the whole system mathematical model of power system can be written as: [0003] [0004] Among them, x = state variable of the system; U = node voltage; I = node injection current; the first equation in formula (1) is a set of differential equations describing the generator set or dynamic load; the second equation is the algebra describing the power grid equation set. [0005] The core of power system transient stability simulation calculation is to solve equations 1 and 2 simultaneously or alternately. [0006] At present, there are mainly four methods for calculating the machine-network interface: [0007] 1. The processing method when the generator adopts the classic model. It can b...

AI Technical Summary

Problems solved by technology

In the traditional method of alternate solution, as described in the computer-network interface calculation methods 2 and 3, the dq-axis conversion calculation of each generator is carried out in the solution of the grid algebraic equations, so that the grid simulation model becomes a time-varying nonlinear algebraic equations , so the power grid simulation model has a large amount of calculation and the programming is more complicated

However, the Newton method described in Computer-Network Interface Calculation Method 4 is to simultaneously solve Equation 1 and Equation 2 in Eq. Parallel computing model for real-time digital simulation of large-scale power system transient stability

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