PT励磁特性对铁磁谐振的影响及检测研究 .pdfVIP

学兔兔 总第47卷 第538期 电测与仪表 VoI．47 No．538 2010年 第10期 Electrical Measurement＆ Instrumentation 0ct．2olO PT励磁特性对铁磁谐振的影响及检测研究 兰华，王彬，杨奠亮，袁天刚 (东北电力大学 电气工程学院，吉林 吉林 132012) 摘要：在中性点不接地的电力系统中，系统母线装置的电磁式电压互感器(PT)，在一定激发条件下极易引起铁 磁谐振过电压。电力系统中铁磁谐振过电压受很多因数的影响。一些文献对铁磁谐振电路中的消耗、电压幅值、 电容值的大小及合闸初相角对谐振过程的影响研究较多，本文将对非线性电感的励磁特性对铁磁谐振的影响 进行深入分析。并利用粒子群优化算法求解非线性铁磁谐振电路方程，从而检测出系统发生铁磁谐振的类型。 通过计算与仿真分析得出一些有实际意义的结论，为相关电力部门采取相应地措施消除谐振提供理论依据。 关键词：电压互感器；铁磁谐振；励磁特性；铁磁元件；MATLAB，SIMuuNK仿真 中图分类号：TM864 文献标识码：A 文章编号：1001—1390(2010)10—0010—05 InflHence of Excitation Characteristics of PT on Ferroresonance and Detection Research LAN Hua，WANG Bin，YANG Yan-liang，YUAN Tian-gang (Electric Engineering Institute，Northeast Dianli University，Jilin 132012，Jilin，China) Abstract：In the neutral point ungrounded power system，system bus in the installation of the electromagnetic potential transformer( ，the ferroresonance overvohage is easy to occur under certain excitation conditions．The ferroresonance in power system is impacted by many factors．Some literature is more consumption of ferromagnetic resonance circuit，the voltage amplitude，capacitance size and early closing phase of the process of ferroresonance． This paper is the further analysis of influence of non-linear excitation characteristics of the inductor on ferroresonance．It uses particle swanTl optimization algorithm for solving nonlinear ferromagnetic resonance circuit equation．Further detect the type of phylogenetic ferroresonance．Through calculation and simulation analysis，it draws some meaningful conclusions，takes corresponding mea