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A Method for Eliminating Negative Resistance in Power System

A power system, negative resistance technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as unconnected power system, no clear solution to negative resistance, one-sided, etc., to meet modeling needs and efficiently eliminate Negative resistance, easy to achieve effect

Active Publication Date: 2018-09-25
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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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

Method used

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  • A Method for Eliminating Negative Resistance in Power System
  • A Method for Eliminating Negative Resistance in Power System
  • A Method for Eliminating Negative Resistance in Power System

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Embodiment Construction

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0032] From the analysis of the cause of negative resistance, in the process of forming the node admittance matrix, in the power system network, let node a be the node to be eliminated, and the node associated with it is b 1 , b 2 ,...b r . node a and node b to be eliminated 1 , b 2 ,...b r The nodal admittance matrix of is:

[0033]

[0034] where y 11 is the self-admittance of node a to be eliminated, y 22 ,y 33 ,...y (r+1)(r+1) To preserve nodal self-admittance, y ij is the mutual admittance between node i and node j. For the self-admittance y of the node a to be eliminated 11 , it is also necessary to transfer the constant impedance load S at node a za Convert to equivalent ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 朱林付东盛启亮武志刚梁年柏
Owner SOUTH CHINA UNIV OF TECH
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