基于内点法的交直流混联系统抗差状态估计  

Robust state estimator for AC/DC hybrid power system based on an interior point method

作　　者：郑伟业[1] 吴文传[1] 张伯明[1] 孙宏斌[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京100084

出　　处：《电力系统保护与控制》2014年第21期1-8,共8页Power System Protection and Control

基　　金：国家重点基础研究发展计划(973计划)(2013CB228203)~~

摘　　要：针对交直流混联系统的状态估计问题,分析了其数学模型,对其求解方法进行了研究,并开发了软件。介绍了交直流混联系统的抗差状态估计模型,根据该模型的特点进行变量等价转换,以降低其复杂度。在利用内点法进行求解时,通过对原问题的海森矩阵进行近似,确保其正定且提升了算法的效率。通过IEEE 9节点、14节点、30节点、118节点、145节点系统这5个算例,分析了算法效率以及收敛域。结果表明,与牛顿法相比,基于内点法的状态估计的收敛域更宽广,可以应对更恶劣的现场状况,具备现场应用潜力。A robust SE model is introduced for AC/DC hybrid system. First, to simplify its formulation, the SE model is transformed into an equivalent form by introducing equality constraints and new variables. In this model, the hybrid system is formulated as a whole. Then, an interior point method is used to solve this problem. And an approximating technique is proposed to guarantee the Hessian matrix positive definite, which can significantly improve the efficiency of the solution. Five numerical tests with IEEE 9 node system, IEEE 14 node system, IEEE 30 node system, IEEE 118 node system, and IEEE 145 node system show that the proposed algorithm is efficient, robust and reliable. It has the potential to be applied in real application.

关 键 词：电力系统 交直流混联系统 内点法 抗差状态估计 

分 类 号：TM73[电气工程—电力系统及自动化]