Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Greedy algorithm-based scheduling policy for three-phase load balance of real-time-allocating distribution network

A greedy algorithm and load balancing technology, applied in the direction of AC network voltage adjustment, calculation, power network operating system integration, etc., can solve the problems of reduced output of distribution network transformers, increased power grid losses, and inability to adjust, so as to achieve power supply reliability guarantee, The effect of improving economic efficiency and preventing frequent switching

Active Publication Date: 2016-10-12
JIANGSU ELECTRIC POWER CO +2
View PDF6 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unbalanced three-phase load will increase the loss of the power grid, which will greatly reduce the quality of the power supply voltage of the heavy-duty phase in the distribution network, resulting in a decrease in the output of the distribution network transformer and a decrease in the efficiency of power conversion.
[0004] However, at present, the scheduling algorithm of the master dispatching part and the slave switching part of the three-phase lossless balance load device is still developing slowly, and it is impossible to switch multiple slaves at the same time. It is impossible to adjust the phase sequence of the electric load in time when the three-phase load unbalance exceeds the limit, and there is a problem that the dispatch cycle is too long

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
  • Greedy algorithm-based scheduling policy for three-phase load balance of real-time-allocating distribution network
  • Greedy algorithm-based scheduling policy for three-phase load balance of real-time-allocating distribution network
  • Greedy algorithm-based scheduling policy for three-phase load balance of real-time-allocating distribution network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] by figure 1 The connection relationship between the user phases and the current of each user load (such as figure 2 shown) for example,

[0047] (1), create an array A with a length of 7 (corresponding to 7 slaves), each value in the array A records whether the corresponding slave switching device is commanded to act during this switching, and initializes the value of the array to 0, when When the command is activated, the corresponding value in the array is set to 1. At this time, the array A is [0,0,0,0,0,0,0]. And create an empty dictionary actions, which is used to store the number of the slave to be acted in each switching process. At this time, the linked list actions is {}.

[0048] (2), the measured three-phase total current is respectively, I a_ph =8+4+2=14A, I b_ph =2+3=5A, I c_ph =2+1=3A, the average value of the current of each phase when the three phases are balanced is calculated by the value of the total current of each phase At this time, the max...

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 provides a greedy algorithm-based scheduling policy for the three-phase load balance of a real-time-allocating distribution network and relates to a scheduling policy for the three-phase load balance of the real-time-allocating distribution network. The scheduling policy comprises the steps of (1) establishing an array Z with the length thereof to be equal to the number of slave switching devices in the distribution network; (2) conducting the real-time online detection on the total currents of three phases Ia_ph, Ib_ph and Ic_ph, and the currents of all users loads of the slave switching devices; (3) determining the value of epsilon; (4) sorting user loads respectively accessed to three phases of A, B and C in the monotonically increasing manner, and respectively storing in linked lists a, b and c; and so on. Compared with the conventional algorithm, a corresponding scheduling scheme can be found out more quickly based on the greedy algorithm. Meanwhile, a plurality of slaves can be simultaneously controlled in the online manner, so that the three-phase unbalance degree of the distribution network is quickly decreased within a short period of time. Therefore, the time-varying characteristics of the electrical loads of the distribution network can be treated.

Description

technical field [0001] The invention relates to a scheduling strategy for real-time distribution of three-phase load balance in a distribution network, and is a scheduling strategy for controlling three-phase imbalance in a distribution network. Background technique [0002] There are a large number of single-phase loads in the distribution network. Due to the unbalanced distribution of single-phase loads and the asynchronous input, the imbalance of three-phase loads has become a prominent problem in the operation and maintenance of low-voltage power grids. The unbalanced three-phase load will increase the loss of the power grid, which will greatly reduce the quality of the power supply voltage of the heavy-duty phase in the distribution network, resulting in a decrease in the output of the distribution network transformer and a decrease in the efficiency of power conversion. [0003] The three-phase load balancing work of the distribution network has received more and more ...

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): G06Q50/06H02J3/14H02J3/26
CPCG06Q50/06H02J3/14H02J3/26Y02B70/3225Y02E40/50Y04S10/50Y04S20/222
Inventor 陆惠斌徐勇沈飞车凯薛军赵季平刘恒门高晓宁陈吉洋杨川黄冠灵
Owner JIANGSU ELECTRIC POWER CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com