期刊刊名：南開學報 　 卷期：9卷1期

篇名出版日期：2012年6月1日

作者：Ying-Pin Chang,張英彬

語言：English

關鍵字：voltage sag, power quality, ITI (CBEMA) curve, ant direction hybrid differential evolution method, specially connected transformers,電壓驟降,電力品質,資訊技術產業曲線（電腦商業設備製造協會）,蟻行混合差分進化法,特殊變壓器連接

被點閱次數：0次

閱讀時間：0sec

摘要：
This paper examined the voltage sag planning of a power system with V-V, Scott, and Le Blanc connected transformers by using the ant direction hybrid differential evolution (ADHDE) method. The analysis considered the ITI (CBEMA) curve and coordination of over-current relays. Firstly, the equivalent node admittance matrix model for calculation of voltage sag was investigated to obtain the sag severity of the system after single or two-phase faults. The analytical equations were useful in the mathematical method and optimal planning for balance and unbalance faults of specially connected transformers. Then, the effect of over-current relay setting on the duration of voltage sag was discussed. The ADHDE was used to obtain the suitable transformer impedances. The relay time multiplier parameter was also a variable. The test on the power systems with V-V, Scott, and Le Blanc connected transformers scheme was chosen to show the effectiveness of this method. The results showed that the voltage sag severity could be improved by the tuning of transformer impedances and relay settings. Finally, this paper showed the optimal transformer reactance values XTRS=7%, system reactance values XTRL=16%, and over-current relay settings k=0.01 was determined by using the ADHDE approach and fault voltage, fault current, fault clearing time, and objective function were 0.6456 p.u., 14.41 p.u, 0.10554 s, and 0.0543 p.u., respectively for the 69kV bus at the VA (V-V) phase. Although the VA (Le Blanc) phase objective function was as high as 0.0833(p.u.), fault voltage, fault current, fault clearing time were satisfied. Because the emigrant, accelerated and mutation operators were embedded in ADHDE, a global optimum and faster convergence were achieved.

　　　　　[全文下載]