A simplification method of power system network avoiding negative resistance

Abstract

The invention discloses a power system network simplifying method capable of avoiding negative resistance. The power system network simplifying method includes: S10, eliminating N to-be-eliminated nodes, merging constant impedance load values of the N to-be-eliminated nodes, and performing transfer processing, wherein a to-be-processed power system network comprises at least one to-be-eliminated node and N is a positive integer; S20, simplifying the to-be-processed power system network which does not contain constant impedance load to obtain a standard-form power system network; S30, performing load flow calculation and transient stability calculation on the to-be-processed power system network and the standard-form power system network respectively; S40, comparing load flow results and transient curves of the two networks; if load flow error or transient error is less than a set threshold value, completing network simplifying; if not, changing a merging scheme, namely repeating the S10 after the to-be-eliminated nodes are arranged and combined. A CSR network simplifying method and a load transfer idea are applied, so that efficient and practical network simplifying is realized and negative resistance can be avoided effectively.

Description

technical field [0001] The invention relates to the field of power system simulation, in particular to a method for simplifying a power system network that avoids the occurrence of negative resistance. Background technique [0002] With the rapid development of the modern power industry, the power system is rapidly developing towards multi-machine (thousands of machines), large power grid (thousands of During system real-time simulation or dynamic model experiment, due to the limitation of simulation scale and hardware equipment, the original system must be reasonably simplified to proceed. In fact, the research on the dynamic performance of a large power system is generally only interested in a certain area, which is called the research system, and the area far away from this area only needs to be considered in the study. , its interior does not need to be described in detail, and it can often be reduced and simplified to save manpower and material resources for research. ...

AI Technical Summary

Problems solved by technology

However, because this method does not consider the problem of eliminating the displacement of the nonlinear load at the node, the analysis of the cause of the negative resistance is relatively one-sided, and this method is only deduced from the mathematical formula to analyze the cause of the negative resistance. Special circumstances that are not related to the actual power system, such as the relationship between line resistance and reactance, the relationship between the active part and the reactive part of the load connected at the node

And it does not clearly propose how to solve the problem of negative resistance, that is, how to deal with negative resistance, so that it cannot meet the modeling problem of simulation software and meet the needs of power system electromagnetic transient simulation

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