A realization method for integrated load model of distribution network in power system

Abstract

The invention provides a method for realizing consideration of the synthesis load model of a distribution network in an electric power system, wherein an equivalent static load, an equivalent motor, an equivalent generator and a reactive power compensation device are connected with a transformer generatrix though an equivalent impedance of the distribution network, thus forming a virtual load node. According to the arithmetic feature of the synthesis load model structure and the stable simulation software in a transient state of the electric power system, the invention provides an iterative solution method which does not expand the scope of node admittance determinant and has a small increase in calculation quantity.

Description

technical field [0001] The invention relates to the simulation and calculation of the power system, in particular to a method for realizing the comprehensive load model of the power distribution network in the power system. Background technique [0002] The digital simulation of the power system has become the main tool for power system planning and design, dispatching operation and analysis research. The mathematical model of each component of the power system and the mathematical model of the whole system constituted by it are the basis of the digital simulation of the power system. Whether the model is accurate or not It directly affects the simulation results and the decision-making scheme based on it. The model and parameters used for simulation are important determinants of simulation accuracy. For a long time, people have conducted in-depth research on the behavior mechanism and on-site measurement of components such as generators, speed control systems, and excitati...

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Problems solved by technology

At the same time, due to the nonlinearity of the load, it is difficult to use mathematical methods to remove the static load from the distribution network equivalently

[0006] 2) The reactive power compensation of the distribution system and the influence of the static load are not considered in the existing model of the motor stator reactance meter and the distribution system impedance

However, since the reactive power compensation of the power distribution system is not considered, it will lead to an increase in the voltage drop of the equivalent impedance of the power distribution system, which will deteriorate the operating conditions of the motor

[0008] 3) The reactive power in the static part of the existing model may have negative constant current and constant power components, that is, it is treated as reactive power

However, there is no generally accepted load model in engineering

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