Paper Information

Title:  A NEW METHOD TO REDUCE UNBALANCE LOAD DISADVANTAGES IN RESIDENTIAL AND COMMERCIAL DISTRIBUTION NETWORKS
Type: SPEECH
Author(s): ZAHEDI LAYAA,NADERI S.MEHDI,GHAREHPETIAN G.B.
 
 
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

IN DISTRIBUTION NETWORKS, MOST OF RESIDENTIAL AND COMMERCIAL LOADS ARE SINGLE PHASE LOADS, SO THEIR CONNECTION IS BETWEEN SINGLE PHASE AND NULL WIRE IN 3PH – FOUR WIRE DISTRIBUTION NETWORKS. USUALLY NUMBER OF LOADS ON 3PH IS NOT EQUAL, AND IF SO, BECAUSE OF DIFFERENT ELECTRICAL USAGE OF SINGLE PHASE USERS, LOAD DISTRIBUTION IS NOT EQUAL IN 3PH. IN THIS REASON THE ELECTRICAL DISTRIBUTION NETWORKS ARE UNBALANCE, SO THERE IS A RETURN CURRENT IN NULL WIRE. IT HAS DIFFERENT DISADVANTAGES SUCH AS INCREASING LOSS IN DISTRIBUTION NETWORKS, MORE WARMING OF 3PH EQUIPMENT, VOLTAGE REDUCTION, FLOWING CURRENT IN NULL WIRE (IT IS DANGEROUS SO), AND REDUCTION IN POWER ELECTRIC QUALITY. ESPECIALLY IN VIEW OF POWER QUALITY CRITERIONS, IT IS EXPRESSED AS EXITING FROM UNBALANCING INDEX STANDARD (RATIO OF ZERO COMPONENT TO POSITIVE COMPONENT). IN THIS PAPER A NEW METHOD IS INVESTIGATED TO REDUCE UNBALANCE INDEX AND OF COURSE REDUCTION OF UNBALANCE DISADVANTAGES. IN THIS METHOD NUMBER OF LOADS ON ONE FEEDER ARE CONSIDERED AS CONTROL LOAD. CONTROLLING LOAD WILL BE SWITCHED BETWEEN PHASES USING A CONTROL SYSTEM. GOAL FUNCTION OF CONTROL SYSTEM IS MINIMIZING UNBALANCE INDEX IN DISTRIBUTION NETWORKS. RESULTS SHOWS THAT UNBALANCE DISADVANTAGES WILL REDUCE, USING INVESTIGATED LOAD CONTROL SYSTEM.

 
Keyword(s): UNBALANCE, DISTRIBUTION NETWORKS, LOSS, UNBALANCE INDEX, LOAD CONTROL
 
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