MATLAB-AIDED SUBSTATION LOAD TRANSFER TABLE DESIGN- EXPERIENCE WITH TAIWAN POWER COMPANY TAIPEI NORTHERN BRANCH DAN-SHUI SUBSTATION
Date Issued
2007
Date
2007
Author(s)
Tzou, Huei-Lung
DOI
zh-TW
Abstract
When the primary side switch equipments of secondary substations of Taiwan Power Company were maintained, the electrical power supply of the whole substation must be interrupted and the load was transferred to near substations. The load transfer tables and load transfer demonstration charts were required for such maintenance and currently were made by man work, consuming much time and human resources. The equipments for fault detection, isolation, and restoration are very expensive and are not available to all branches. When the outage happened, the load transfer tables could not be immediately made causing more service interruption time. If the computer program was used to make the load transfer tables, the time for deciding the load transfer would be saved and the losses and the manmade mistakes for the power interruption would be reduced.
This thesis takes the Dan-Shui substation as an example and uses MATLAB software to write programs to make the load transfer table for outage or maintenance of secondary substations. Firstly, input the connection conditions and some real data of Dan-Shui substation to the computer program. Then set up the data by tree type, sort the data and use search techniques to find the distribution feeders for load transfer. And consider the important users feeders(such as hospitals, important institutions for directing, police station, etc) have the most priority for load transfer, uni-out-connected distribution feeders are less prior, multi-out-connected distribution feeders are least prior and the distribution feeders out connected which have least current get the most priority to take the load. If applying this study, the load transfer could be automatically arranged just by inputting the feeder current values and
the main transformer loading conditions at that time to the computer when the primary side switch equipment needs maintenance. The computer program also includes the load-shedding function considering the condition when the main transformers are overloaded. So the system weak points can be found through the computer program developed by this study and can act as reference to system planning.
This thesis only considers the load transfer outside the substation, not yet the bus load transfer, restoration feeder load transfer and multi-section load transfer. Suggest that these three kinds of load transfer can be the future work.
Subjects
負載轉供
配電系統
最佳優先搜尋法
LOAD TRANSFER
POWER DISTRIBUTION SYSTEM
BEST-FIRST SEARCH
Type
thesis