Power system dynamic equivalence method suitable for electromagnetic transient analysis

A power system, dynamic equivalent technology, applied in the value field, can solve problems such as negative impedance branches

Inactive Publication Date: 2011-06-22
ZHEJIANG UNIV +1
View PDF3 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a power system dynamic equivalent method suitable for electromagnetic transient analysis, which avoids the problem of negative impedance branches in the equivalent process of the traditional equivalent method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power system dynamic equivalence method suitable for electromagnetic transient analysis
  • Power system dynamic equivalence method suitable for electromagnetic transient analysis
  • Power system dynamic equivalence method suitable for electromagnetic transient analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] The equivalent value of the 500kV busbar in Dongguan, Guangdong in the planning data of China Southern Power Grid in 2013 was selected as an example.

[0104] (1) Determine the bus type

[0105] Search whether there is a bus with a voltage level equal to or higher than 500kV connected to the Dongguan 500kV bus through a line with a voltage lower than 500kV, and find that there is no such bus, so the Dongguan 500kV bus belongs to the first type of bus.

[0106] (2) Determine the capacity and inertia time constant of the equivalent generator

[0107] Traverse the generators connected to the 500kV busbar in Dongguan through lines with a voltage level lower than 500kV, and obtain the capacity Si and inertial time constant H of these generators i (i=1, 2, . . . N, N being the number of generators). The capacity of the equivalent generator is based on the principle of capacity addition, and the inertial time constant H G The calculation idea is to combine the H of each gen...

Embodiment 2

[0122] The equivalent value of the 500kV busbar at the Yunnan factory entrance in the planning data of China Southern Power Grid in 2013 was selected as an example.

[0123] (1) Determine the bus type

[0124] Search whether there is a bus with a voltage level equal to or higher than 500kV connected to the 500kV bus at the factory entrance through a line with a voltage lower than 500kV. It is found that only the 500kV bus in Qujing is indirectly connected with the 500kV bus at the factory through a line with a voltage lower than 500kV, so the factory Kou and Qujing 500kV buses belong to the second category of buses.

[0125] (2) Determine the capacity, inertia time constant, active output and reactive power of the equivalent generator

[0126] Traverse the generators connected to the factory entrance and Qujing 500kV bus through lines with a voltage level lower than 500kV, and obtain the capacity S of these generators i and the inertial time constant H i (i=1, 2, ... N, N i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a power system dynamic equivalence method suitable for electromagnetic transient analysis. The method comprises the following steps of: retaining a backbone network at the voltage level of 500 kV and above in a power system; classifying 500 kV-buses into two classes; and respectively decomposing and performing equivalence on first-class 500 kV-buses and second-class 500 kV-buses, wherein different equivalence models are adopted to the two classes of the 500 kV-buses. A dynamic simulation analysis result shows that dynamic characteristics before and after performing the equivalence on the power system by the equivalence method are basically consistent, thereby showing the feasibility and the effectiveness of the equivalence method.

Description

technical field [0001] The invention relates to a dynamic equivalent method of a power system, in particular to a dynamic equivalent method of a power system suitable for electromagnetic transient analysis. Background technique [0002] With the development of large AC and DC power grids in China, the AC and DC power transmission system is becoming larger and larger. Existing electromechanical transient simulation programs for AC and DC power systems can only simulate the system under the condition of fundamental symmetry, and cannot provide accurate and strict analysis for operating states that deviate from ideal assumptions; , and then according to the calculation of the positive sequence component of the electromechanical transient simulation program, the results that do not conform to the actual situation will be obtained. Therefore, the electromechanical transient simulation program currently used in the power system cannot meet the simulation requirements during the as...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02H7/26
Inventor 徐政翁华陈新琪
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap