一种暂态功角稳定故障损失估计方法  

An Evaluation Method for Transient Stability Contingency Cost

作　　者：刘哲[1] 贾宏杰[1] 

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072

出　　处：《天津大学学报》2011年第9期759-767,共9页Journal of Tianjin University(Science and Technology)

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB219701;2010CB234600);天津市科技发展计划资助项目(09JCZDJC25000);"十一五"国家科技支撑计划重大资助项目(2006BAJ03A06);博士学科点专项科研基金资助项目

摘　　要：在进行电力系统暂态稳定风险评估时,科学估算故障引起的系统损失是其核心问题.为此,将故障引起的损失看作将系统从不稳定状态转化为稳定状态所需要的最小控制代价,借助轨迹灵敏度技术,将上述问题转化为一个考虑暂态稳定约束的最优潮流问题实现求解.推导了发电机相对功角同发电机及负荷功率之间的灵敏度系数;利用灵敏度系数和发电机相对功角形成系统的暂态稳定约束,将之引入最优潮流实现对故障最小控制代价的求解;并且利用IEEE-14、New England-39节点等系统验证了所提方法的正确性和有效性.In power system transient stability risk assessment, it is a core issue to properly estimate the cost consequences caused by instability events. In this paper, the cost consequences of a contingency are considered as the minimum control cost to move the system from instability to stability under the contingency. Trajectory sensitivity is employed to properly consider the transient stability constraints in the optimal power flow （OPF） .The minimum objec- tive of the OPF is the determination of contingency cost. The sensitivities of the relative rotor angle with respect to the output of generator and the dispatchable load are firstly derived. The information is then used to imitate the transient stability constraints in the OPF. The correctness and effectiveness of the proposed method in this paper is finally validated by some systems, such as IEEE 14-bus system and New England 39-bus system.

关 键 词：暂态稳定 风险评估 轨迹灵敏度 最优潮流 

分 类 号：TM712[电气工程—电力系统及自动化]