A newly developed heuristic global optimization algorithm, called gravitational search algorithm （GSA）, was introduced and applied for simultaneously coordinated designing of power system stabilizer （PSS） and thyr...A newly developed heuristic global optimization algorithm, called gravitational search algorithm （GSA）, was introduced and applied for simultaneously coordinated designing of power system stabilizer （PSS） and thyristor controlled series capacitor （TCSC） as a damping controller in the multi-machine power system. The coordinated design problem of PSS and TCSC controllers over a wide range of loading conditions is formulated as a multi-objective optimization problem which is the aggregation of two objectives related to damping ratio and damping factor. By minimizing the objective function with oscillation, the characteristics between areas are contained and hence the interactions among the PSS and TCSC controller under transient conditions are modified. For evaluation of effectiveness and robustness of proposed controllers, the performance was tested on a weakly connected power system subjected to different disturbances, loading conditions and system parameter variations. The cigenvalues analysis and nonlinear simulation results demonstrate the high performance of proposed controllers which is able to provide efficient damping of low frequency oscillations.展开更多
可控串联电容补偿(thyristor controlled series capacitor,TCSC)能够控制串联电容器与汽轮发电机轴系之间的能量交换,抑制系统中的次同步分量,从而避免发生次同步谐振的风险。对TCSC抑制次同步谐振(sub-synchronous resonance,SSR)的2...可控串联电容补偿(thyristor controlled series capacitor,TCSC)能够控制串联电容器与汽轮发电机轴系之间的能量交换,抑制系统中的次同步分量,从而避免发生次同步谐振的风险。对TCSC抑制次同步谐振(sub-synchronous resonance,SSR)的2种不同方法,即自然抑制和主动抑制,进行了分析和对比,设计了次同步阻尼控制器,研究了TCSC在不同触发角下及附加了阻尼控制器的主动抑制下对次同步谐振抑制的效果,通过PSCAD/EMTDC对这些方法进行时域仿真发现,2种方法均能有效抑制SSR,而主动抑制的效果更好一些。展开更多
支路传输功率、节点电压等的越限是制约系统输电能力提高的重要因素,为此文章采用连续潮流模型,在临界运行点推导了输电能力对支路电抗灵敏度的数学表达式,提出根据此灵敏度排序结果确定可控串联补偿器(thyristor controlled series cap...支路传输功率、节点电压等的越限是制约系统输电能力提高的重要因素,为此文章采用连续潮流模型,在临界运行点推导了输电能力对支路电抗灵敏度的数学表达式,提出根据此灵敏度排序结果确定可控串联补偿器(thyristor controlled series capacitor,TCSC)安装地点的新方法。该方法中,TCSC安装位置确定以后,将安装TCSC之前发生越界的不等式约束在其边界值处用等式形式表示出来,并设定为已知条件,将TCSC对其所要安装支路的补偿度设定为一个新的未知量,扩展常规潮流方程,以求取扩展潮流不匹配函数的最小值为目标,计算支路的最优补偿度。对IEEE30节点和IEEE118节点系统的仿真计算结果表明该文所提出的选址和定容方法是有效的。展开更多
针对如何确定可控串联电容器(Thyristor Controlled Series Capacitor,TCSC)的安装位置和容量,以最大限度地提高系统可用输电能力(Available transfer capability,ATC),建立了用于提高输电能力的TCSC优化配置数学模型,对免疫算法中抗体...针对如何确定可控串联电容器(Thyristor Controlled Series Capacitor,TCSC)的安装位置和容量,以最大限度地提高系统可用输电能力(Available transfer capability,ATC),建立了用于提高输电能力的TCSC优化配置数学模型,对免疫算法中抗体按亲和度的排序法进行了改进,使抗体种群向补偿量减小的方向进化,可以节省补偿容量。利用改进后的免疫算法对模型进行求解,该方法能够同时确定TCSC的最佳安装地点和最优补偿度,且对加装多个TCSC时的情况也同样适用。最后对IEEE30节点系统进行计算,并应用逐条支路安装测试的方法对结果加以验证,表明所提方法是合理且有效的。展开更多
作为一种特殊的网络攻击形式,负荷重分配LR(load redistribution)攻击受到了越来越多的关注,同时可控串联补偿器TCSC(thyristor controlled series compensation)在实际电网中得到了广泛的应用。为此,研究了LR攻击和TCSC接入对电力系统...作为一种特殊的网络攻击形式,负荷重分配LR(load redistribution)攻击受到了越来越多的关注,同时可控串联补偿器TCSC(thyristor controlled series compensation)在实际电网中得到了广泛的应用。为此,研究了LR攻击和TCSC接入对电力系统运行可靠性的影响。分析了LR攻击的作用原理,建立了考虑LR攻击和TCSC接入的系统负荷削减双层优化模型;提出了基于非序贯蒙特卡洛模拟的考虑LR攻击和TCSC接入的可靠性评估算法,并定义了反映LR攻击严重程度的评价指标。以IEEE RTS79修改系统为例进行了算例分析,算例结果验证了提出的负荷削减模型和可靠性评估算法的正确性。展开更多
基金Project(UKM-DLP-2011-059) supported by the National University of Malaysia
文摘A newly developed heuristic global optimization algorithm, called gravitational search algorithm （GSA）, was introduced and applied for simultaneously coordinated designing of power system stabilizer （PSS） and thyristor controlled series capacitor （TCSC） as a damping controller in the multi-machine power system. The coordinated design problem of PSS and TCSC controllers over a wide range of loading conditions is formulated as a multi-objective optimization problem which is the aggregation of two objectives related to damping ratio and damping factor. By minimizing the objective function with oscillation, the characteristics between areas are contained and hence the interactions among the PSS and TCSC controller under transient conditions are modified. For evaluation of effectiveness and robustness of proposed controllers, the performance was tested on a weakly connected power system subjected to different disturbances, loading conditions and system parameter variations. The cigenvalues analysis and nonlinear simulation results demonstrate the high performance of proposed controllers which is able to provide efficient damping of low frequency oscillations.
文摘可控串联电容补偿(thyristor controlled series capacitor,TCSC)能够控制串联电容器与汽轮发电机轴系之间的能量交换,抑制系统中的次同步分量,从而避免发生次同步谐振的风险。对TCSC抑制次同步谐振(sub-synchronous resonance,SSR)的2种不同方法,即自然抑制和主动抑制,进行了分析和对比,设计了次同步阻尼控制器,研究了TCSC在不同触发角下及附加了阻尼控制器的主动抑制下对次同步谐振抑制的效果,通过PSCAD/EMTDC对这些方法进行时域仿真发现,2种方法均能有效抑制SSR,而主动抑制的效果更好一些。
文摘支路传输功率、节点电压等的越限是制约系统输电能力提高的重要因素,为此文章采用连续潮流模型,在临界运行点推导了输电能力对支路电抗灵敏度的数学表达式,提出根据此灵敏度排序结果确定可控串联补偿器(thyristor controlled series capacitor,TCSC)安装地点的新方法。该方法中,TCSC安装位置确定以后,将安装TCSC之前发生越界的不等式约束在其边界值处用等式形式表示出来,并设定为已知条件,将TCSC对其所要安装支路的补偿度设定为一个新的未知量,扩展常规潮流方程,以求取扩展潮流不匹配函数的最小值为目标,计算支路的最优补偿度。对IEEE30节点和IEEE118节点系统的仿真计算结果表明该文所提出的选址和定容方法是有效的。
文摘针对如何确定可控串联电容器(Thyristor Controlled Series Capacitor,TCSC)的安装位置和容量,以最大限度地提高系统可用输电能力(Available transfer capability,ATC),建立了用于提高输电能力的TCSC优化配置数学模型,对免疫算法中抗体按亲和度的排序法进行了改进,使抗体种群向补偿量减小的方向进化,可以节省补偿容量。利用改进后的免疫算法对模型进行求解,该方法能够同时确定TCSC的最佳安装地点和最优补偿度,且对加装多个TCSC时的情况也同样适用。最后对IEEE30节点系统进行计算,并应用逐条支路安装测试的方法对结果加以验证,表明所提方法是合理且有效的。
