在含TCSC型故障限流器(thyristor-controlled series capacitor-based fault current limiter,TCSC-FCL)线路距离保护的整定中,通常将TCSC-FCL作为电抗器处理,忽略其动态阻抗特性,可能导致保护拒动/误动或速动性不足。针对上述问题,建立...在含TCSC型故障限流器(thyristor-controlled series capacitor-based fault current limiter,TCSC-FCL)线路距离保护的整定中,通常将TCSC-FCL作为电抗器处理,忽略其动态阻抗特性,可能导致保护拒动/误动或速动性不足。针对上述问题,建立TCSC-FCL动态阻抗分析模型,对TCSC-FCL独有的首周波旁路模式下的阻抗时变特性进行分析,研究其从串补模式切换到限流模式的动态阻抗变化过程,提出TCSC-FCL动态阻抗特性函数表示方法,并提出基于动态偏移阻抗圆的距离保护整定策略,以消除TCSC-FCL动态阻抗特性对距离保护动作性能的影响。建立含TCSC-FCL的典型输电网模型,验证上述动态特性函数表示方法以及距离保护整定策略的正确性。展开更多
We give an example which shows that the Burago’s bounded distance theorem does not hold in a non-intrinsic metric case. The argument is based on the classical answer to the densest circle packing problem in ?2.
This paper presents a result of approximation an arc circles by using a quartic Bezier curve. Based on the barycentric coordinates of two and three combination of control points, the interior control points are determ...This paper presents a result of approximation an arc circles by using a quartic Bezier curve. Based on the barycentric coordinates of two and three combination of control points, the interior control points are determined by forcing the curvature at median point as similar as the given curvature at end points. Hausdorff distance is used to investigate the order of accuracy compare to the actual arc circles through central angle of . We found that the optimal approximation order is eight which is somewhat similar to preceding methods in the literatures.展开更多
文摘在含TCSC型故障限流器(thyristor-controlled series capacitor-based fault current limiter,TCSC-FCL)线路距离保护的整定中,通常将TCSC-FCL作为电抗器处理,忽略其动态阻抗特性,可能导致保护拒动/误动或速动性不足。针对上述问题,建立TCSC-FCL动态阻抗分析模型,对TCSC-FCL独有的首周波旁路模式下的阻抗时变特性进行分析,研究其从串补模式切换到限流模式的动态阻抗变化过程,提出TCSC-FCL动态阻抗特性函数表示方法,并提出基于动态偏移阻抗圆的距离保护整定策略,以消除TCSC-FCL动态阻抗特性对距离保护动作性能的影响。建立含TCSC-FCL的典型输电网模型,验证上述动态特性函数表示方法以及距离保护整定策略的正确性。
基金This work was partially supported by the Natural Science Foundation of Hunan Province(Grant No.06555009)Scientific Research Fund of Hunan Provincial Education Department(Grant No.00C194)
文摘We give an example which shows that the Burago’s bounded distance theorem does not hold in a non-intrinsic metric case. The argument is based on the classical answer to the densest circle packing problem in ?2.
文摘This paper presents a result of approximation an arc circles by using a quartic Bezier curve. Based on the barycentric coordinates of two and three combination of control points, the interior control points are determined by forcing the curvature at median point as similar as the given curvature at end points. Hausdorff distance is used to investigate the order of accuracy compare to the actual arc circles through central angle of . We found that the optimal approximation order is eight which is somewhat similar to preceding methods in the literatures.
