Investigations on Boundaries of Controllable Power Flow with Uniefed Power Flow Controller

S. Srividhya, C. Nagamani, A. Karthikeyan
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引用次数: 3

Abstract

The limits of controllable power flow in the transmission line with the UPFC are determined by the equipment ratings and the line limits. In this paper, boundaries of controllable power flow in a simple two machine power system with UPFC based on a geometrical approach are investigated. The main advantage of this geometrical approach is that even with a minimum computational effort, it gives a clear insight regarding the operational area of the power system with UPFC. However, certain subtle aspects of this geometrical method have not been addressed. A clear and comprehensive explanation of the mathematical basis is presented in this paper for the geometrical approach for evaluating the controllable power flow. Although in a general sense, the location of UPFC within a line is not a crucial parameter affecting the overall performance, results of the geometric approach indicate discontinuities in the P-delta curves specifically in certain ranges of delta. Overall, the results indicate that there is no significant effect of the location of UPFC on the minimum and maximum real power transmitted at a given power angle within the boundaries of controllable power flow. However the corresponding reactive power and currents are affected by location of UPFC. Further, according to the geometrical approach, the feasible range of delta itself depends upon the location of UPFC. Also, the investigations reveal the restricted scope of the geometrical approach. Overall, it is observed that the geometrical approach is appropriate and useful only for some ranges of power angle and location of UPFC.
基于统一潮流控制器的可控潮流边界研究
使用UPFC的传输线中可控制潮流的极限由设备额定值和线路极限决定。本文基于几何方法研究了具有UPFC的简单双机电力系统的可控潮流边界。这种几何方法的主要优点是,即使使用最小的计算量,它也可以清楚地了解具有UPFC的电力系统的操作区域。然而,这种几何方法的某些微妙方面还没有得到解决。本文对可控制潮流的几何评价方法的数学基础作了清晰而全面的说明。虽然在一般意义上,UPFC在一条线内的位置并不是影响整体性能的关键参数,但几何方法的结果表明,P-delta曲线在特定的delta范围内是不连续的。综上所述,在可控潮流边界内,UPFC的位置对给定功率角下传输的最小和最大实际功率没有显著影响。而UPFC的位置会影响相应的无功功率和电流。此外,根据几何方法,delta本身的可行范围取决于UPFC的位置。此外,研究还揭示了几何方法的局限性。总体而言,观察到几何方法仅适用于某些功率角范围和UPFC位置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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