Power System Analysis and Design of an Expanding Steel Cogeneration Plant

• Main Authors: feng-ming Liu, 劉豐銘
• Other Authors: 許振廷
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/57630832560629004087

碩士 === 南台科技大學 === 電機工程系 === 98 === This thesis investigates the power system design and analysis of an expanding steel cogeneration plant. The items like short circuit, power flow, voltage drop and harmonic analyses have been performed. The location and capacity of shunt capacitors, and the tap position of transformers are both determined to maintain all the buses voltage at acceptable range and to keep the power factor at PCC above 0.95. To limit the fault current for all buses in the plant, the impedances of transformers are designed although they consumed more reactive power from the system. The voltage drop caused by the dramatic reactive power variation of hot strip mill and the starting of induction motors were calculated by using the maximum reactive power fluctuation method and simulated by applying the PSAF software. It is found that the maximum voltage variation can be reduced form 10.7% to 5% if proper SVC was installed at the hot strip mill. Also, the voltage sag due to the starting of induction motor was reached to 11.43% and therefore the auxiliary starting equipment like Y-Δ assiatance may be necessary. For the expanding steel plant, the total voltage and the total demand current harmonic distortion at PCC are calculated as 1.68% and 1.62%, respectively with the installation of capacitors only. However, they can be reduced to 0.45% and 0.42% if the suggestion passive filters were installed. It is concluded that the power quality and operation performance of the steel plant can be effectively enhanced by executing the relative power system analyses.