THE ANALYSIS OF ON-LOAD TAP-CHANGER TRANSFORMER REGULATING THE DISTRIBUTION SYSTEM VOLTAGE BY USING DIFFERENT REFERENCE VOLTAGE

• Main Authors: Tsang-Bin Chang, 張倉賓
• Other Authors: Bin-Kwie Chen
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/60866907021517531925

碩士 === 大同大學 === 電機工程研究所 === 91 === Generally the on-load tap-changer transformers of Taiwan Power Company’s conventional power distribution system only detect and gather the low-voltage side single-phase voltage for reference values. Because the unbalance of distribution system will cause the different three phase voltage that will make the on-load tap-changer transformers inappropriate adjustment of the voltage. The thesis is using DSP collocated wavelet transformation filtering the noise, then calculated the positive voltage accurately as the reference voltage of three-phase voltage transformer to avoid the voltage at the end points of the consumer feeder is too high or too low. The thesis adopts Simulink release 13 to simulate a five bus distribution system. The results of simulation are the comparison between the distribution system voltages that the reference voltages of on-load tap-changer transformer is adopted the single phase voltage and the reference voltages of on-load tap-changer transformer is adopted the positive sequence voltage. According to the results of simulation, using the positive sequence voltage as the reference value of the on-load tap-changer transformer can avoid the inappropriate adjustment of the voltage that was used the single phase as the reference value and the lifetime of tap-changer increase because of the less position shift. Therefore using the positive sequence voltage as the reference value of the on-load tap-changer transformer is the better choice.