采用阻尼电阻并接模型的主动式抑制、消除PT铁磁谐振方法
Active Suppression and Elimination of PT Ferromagnetic Resonance Using a Damping Resistor Parallel Model
宋凯 1陈佳栩 1刘煜 1魏桐宇1
作者信息
- 1. 广东电网有限责任公司揭阳供电局,广东 揭阳 522000
- 折叠
摘要
中性点不接地系统中,由于对地容抗与电磁式电压互感器感抗的不利组合,在系统电压出现大扰动时,常常会产生铁磁谐振现象,造成PT损坏.对此,提出一种采用阻尼电阻并接模型抑制、消除PT铁磁谐振的方法,于PT开口三角处并接阻尼电阻并接模型,利用阻尼大电阻实现提前抑制高频谐振;通过分析PT 一次零序电流和开口三角零序电压,区分单相接地故障和谐振,控制阻尼小电阻投入消除谐振.利用M ATLAB/Simulink建立的仿真模型验证了所提出的方法的可行性.
Abstract
In ungrounded neutral systems,due to the unfavorable combination of ground capacitance and electromagnetic voltage transformer inductance,ferromagnetic resonance often occurs when the system voltage undergoes large disturb-ances,resulting in PT damage.To this end,a method of suppressing and eliminating PT ferromagnetic resonance by using a damping resistor parallel model is proposed.The damping resistor is parallelly connected to the model at the PT open tri-angle,and a large damping resistor is used to achieve early suppression of high-frequency resonance.By analyzing the PT primary zero sequence current and open triangle zero sequence voltage,single-phase grounding fault and resonance are dis-tinguished,and the damping small resistor is controlled to eliminate resonance.A simulation on model established by MATLAB/Simulink verifies the feasibility of the proposed method.
关键词
铁磁谐振/Simulink/消谐/主动式Key words
ferromagnetic resonance/Simulink/resonance elimination/active引用本文复制引用
基金项目
广东电网有限责任公司揭阳供电局职创项目(GDZC202208180004)
出版年
2024
NETL
NSTL
万方数据