For a single machine infinite power system with thyristor controlled series compensation(TCSC) device, which is affected by system model uncertainties, nonlinear time-delays and external unknown disturbances, we prese...For a single machine infinite power system with thyristor controlled series compensation(TCSC) device, which is affected by system model uncertainties, nonlinear time-delays and external unknown disturbances, we present a robust adaptive backstepping control scheme based on the radial basis function neural network(RBFNN). The RBFNN is introduced to approximate the complex nonlinear function involving uncertainties and external unknown disturbances, and meanwhile a new robust term is constructed to further estimate the system residual error,which removes the requirement of knowing the upper bound of the disturbances and uncertainty terms. The stability analysis of the power system is presented based on the Lyapunov function,which can guarantee the uniform ultimate boundedness(UUB) of all parameters and states of the whole closed-loop system. A comparison is made between the RBFNN-based robust adaptive control and the general backstepping control in the simulation part to verify the effectiveness of the proposed control scheme.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
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
针对电力系统的稳定性问题,设计了发电机励磁系统与可控串联补偿TCSC(thysistor controlled series compensation)装置的协调控制器。该方法从发电机励磁系统与TCSC模型出发,建立了含TCSC的单机无穷大系统的四阶非线性状态空间模型,利...针对电力系统的稳定性问题,设计了发电机励磁系统与可控串联补偿TCSC(thysistor controlled series compensation)装置的协调控制器。该方法从发电机励磁系统与TCSC模型出发,建立了含TCSC的单机无穷大系统的四阶非线性状态空间模型,利用非线性系统的微分几何理论,将其非线性模型精确线性化。在线性化模型的基础上,考虑电力系统运行参数的不确定性,采用滑模控制理论对发电机励磁系统与TCSC进行协调控制,通过指数趋近律和准滑动模态方法,最终获得了整个系统的滑模协调控制规律。单机无穷大电力系统仿真结果表明,所设计的协调控制方法对电力系统的扰动具有良好的适应性和鲁棒性,提高了电力系统的稳定性。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
基金supported in part by the National Natural Science Foundation of China(61433004,61703289)
文摘For a single machine infinite power system with thyristor controlled series compensation(TCSC) device, which is affected by system model uncertainties, nonlinear time-delays and external unknown disturbances, we present a robust adaptive backstepping control scheme based on the radial basis function neural network(RBFNN). The RBFNN is introduced to approximate the complex nonlinear function involving uncertainties and external unknown disturbances, and meanwhile a new robust term is constructed to further estimate the system residual error,which removes the requirement of knowing the upper bound of the disturbances and uncertainty terms. The stability analysis of the power system is presented based on the Lyapunov function,which can guarantee the uniform ultimate boundedness(UUB) of all parameters and states of the whole closed-loop system. A comparison is made between the RBFNN-based robust adaptive control and the general backstepping control in the simulation part to verify the effectiveness of the proposed control scheme.
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。
文摘针对电力系统的稳定性问题,设计了发电机励磁系统与可控串联补偿TCSC(thysistor controlled series compensation)装置的协调控制器。该方法从发电机励磁系统与TCSC模型出发,建立了含TCSC的单机无穷大系统的四阶非线性状态空间模型,利用非线性系统的微分几何理论,将其非线性模型精确线性化。在线性化模型的基础上,考虑电力系统运行参数的不确定性,采用滑模控制理论对发电机励磁系统与TCSC进行协调控制,通过指数趋近律和准滑动模态方法,最终获得了整个系统的滑模协调控制规律。单机无穷大电力系统仿真结果表明,所设计的协调控制方法对电力系统的扰动具有良好的适应性和鲁棒性,提高了电力系统的稳定性。
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。
