A Method for Eliminating Negative Resistance in Power System

Abstract

The invention discloses a method of eliminating negative resistance of a power system. The method is characterized in that step S10, a power flow result of a simplified power network system and a resistance value and a reactance value of a newly generated serial connection branch circuit comprising the negative resistance are acquired, and the power flow result is a power flow calculation result before the simplification of the power network system; step S20, the equivalent current network conversion of the serial connection branch circuit comprising the negative resistance is carried out, and a ground admittance branch circuit comprising the negative resistance and positive resistance is acquired by the conversion; step S30, the negative resistance of the ground admittance branch circuit is neglected, and the positive resistance is retained, and then the parameters of the branch circuit comprising the negative resistance are updated to form a new branch circuit. The method of eliminating the negative resistance based on the power flow calculation result is advantageous in that the negative resistance is eliminated by adopting less steps and without changing the dynamic characteristics of the system a lot, and therefore a modeling requirement of an electromagnetic transient state simulation software on the network comprising the negative resistance and the simulation requirement of the network comprising the negative resistance are required.

Description

technical field [0001] The invention relates to the field of power system simulation, in particular to a method for eliminating negative resistance in a power system. 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. The area to be simplified is called...

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Problems solved by technology

However, this method does not conduct in-depth research on the displacement of nonlinear loads that eliminate nodes, resulting in a relatively one-sided analysis of the reasons for the generation of negative resistance; it is also not connected with 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 node injected power, etc.; no clear solution to the negative resistance was proposed

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