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Energy efficiency analysis method suitable for direct-current power distribution network circuits

A DC distribution network and analysis method technology, applied in the field of power transmission and distribution systems, can solve problems such as DC power distribution technology has not yet been put into use, and achieve a clear and simple analysis process

Active Publication Date: 2014-04-09
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, low-voltage DC power distribution technology has only been realized in small-scale power distribution systems such as aircraft and ships, and DC power distribution technology has not yet been put into high- and medium-voltage engineering examples.

Method used

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  • Energy efficiency analysis method suitable for direct-current power distribution network circuits
  • Energy efficiency analysis method suitable for direct-current power distribution network circuits
  • Energy efficiency analysis method suitable for direct-current power distribution network circuits

Examples

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Embodiment

[0121] The present invention selects the YJV22 model cable as the research object in the medium-voltage circuit, and studies the cable circuit.

[0122] The example of the present invention has chosen the YJV22 type cable as a special case, and has chosen single-phase cross-sectional area 240mm 2 The energy efficiency analysis of these two types of cables is carried out, and the four energy efficiency indicators of the two types of cables, namely, active power loss, transmission efficiency, power loss and line loss rate, are calculated, and the input AC current and input DC current are compared.

[0123] 1. Set the boundary conditions

[0124] 1) After calculation and looking up information, the single-phase cross-sectional area is 240mm 2 The unit resistance of the YJV22 cable when inputting AC power is 0.0985Ω / km, and the unit resistance when inputting DC power is 0.0754Ω / km;

[0125] 2) The line length is set to 3km;

[0126] 3) The active power consumed by the load supp...

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Abstract

The invention relates to analysis methods of the power transmission and distribution system field of electric engineering, in particular to an energy efficiency analysis method suitable for direct-current power distribution network lines. The energy efficiency analysis method is suitable for a medium voltage distribution network and line analysis is dominant in energy efficiency analysis. According to the energy efficiency analysis method, on the portion of the lines, cable conductors serve as main research objects, the energy efficiency indexes of the alternating-current line, the monopole direct-current line and the bipolar direct-current line are analyzed and compared, and which line is higher in energy efficiency is judged. For the alternating-current line, the monopole direct-current line and the bipolar direct-current line, specific calculation models of the indexes including active power loss, power supply efficiency, electric energy loss and line loss per unit are provided. The energy efficiency analysis method can be widely applied to calculation and comparison of the power distribution networks with different voltage levels, results and conclusions obtained at different voltage levels can be different, and an energy efficiency analysis and comparison conclusion of the alternating-current scheme of the power distribution network and the direct-current scheme of the power distribution network can be made by the adoption of the energy efficiency analysis method.

Description

technical field [0001] The invention relates to an analysis method in the field of power transmission and distribution systems in electrical engineering, in particular to an energy efficiency analysis method suitable for direct current distribution network lines. Background technique [0002] The power grid is divided into two forms: the transmission network and the distribution network. These two types of power grids are classified based on different voltage levels and roles in the power system. The transmission network is a power network that connects power plants and substations, and substations and substations through high-voltage and ultra-high-voltage transmission lines to complete power transmission. It is also called the main grid in the power grid. The distribution network is a power network that receives electric energy from the transmission network or regional power plants and distributes it to users locally or step by step through power distribution facilities. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 苏剑韦涛惠慧崔艳妍刘自发李梦渔徐兢浩李韦姝
Owner STATE GRID CORP OF CHINA
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