基于储能参与的电网连锁跳闸主动防控方法

Active Prevention and Control Method Against Power Grid Cascading Tripping Based on Participation of Energy Storage

新型电力系统中系统惯性降低及触发连锁跳闸风险因素的增多,使得防范连锁跳闸的重要性愈发凸显。针对这一问题,提出一种融合储能的电网连锁跳闸抑制方法。利用储能的快速响应特性,在潮流转移初期即投入储能调控电网潮流,可快速抑制导线温升,为后续水火电机组及其他慢速响应的备用电源参与调控赢得时间。文中提出了基于网络动态最大电气介数、风险扫描和需量计算的“三要素法”储能配置决策方法,包括构建反映网络薄弱环节和时变风险的连锁跳闸防控预案,解决了连锁跳闸抑制的储能资源时空选择问题;基于输电线路动态热特性,提出了储能与水火电协同调控时的储能功率和容量计算方法,确定了防范连锁跳闸所需要的储能资源规模。针对IEEE 30节点网络给出了N-1和N-2故障计算案例,验证了所提方法的有效性。

The decrease in system inertia and the increase in risk factors for triggering cascading trips in the new power system makes the importance of preventing cascading trips increasingly prominent.Aiming at this problem,a method integrated with energy storage is proposed for suppressing cascading trips in power grid.By using the fast response characteristics of energy storage,the energy storage is put into operation to regulate the power flow in the early stage of power flow transfer,which can quickly suppress the temperature rise of the wires and gain time for the subsequent participation of hydrothermal power units and other slow-responding backup power sources in regulation.Based on dynamic maximum electrical betweenness of the network,risk scanning and demand calculation,the paper proposes a“three-step”allocation decision-making method for energy storage,including constructing a cascading tripping prevention and control plan that reflects network weaknesses and time-varying risks and solving the spatial and temporal selection problem of energy storage resources to suppress cascading tripping.Based on the dynamic thermal characteristics of transmission lines,a calculation method for energy storage power and capacity during the coordinated regulation of energy storage and hydrothermal power is proposed,and the scale of energy storage resources required to prevent cascading tripping is determined.The N-1 and N-2 fault calculation cases are provided for IEEE 30-bus network to verify the effectiveness of the proposed method.