摘要
针对现有线路除冰技术的缺陷,提出了基于线路集肤效应现象和串联谐振原理的谐振集肤电流融冰法。该方法通过提高线路融冰电流的频率来加深线路的集肤效应,使线路单位长度的电阻显著提高,即在相同的发热功率要求下可减少线路的传输电流;同时控制传送电流频率在线路等效电感和串入谐振电容器的谐振点处,使线路变为纯电阻性负载,完全消除线路的无功电流传送。简要论述了级联型除冰装置的具体构成及其主要的控制方法——载波相移空间矢量PWM调制法、自适应频率控制、分相控制,并给出了装置具体的线路连接运行图。实例计算表明,提出的谐振集肤电流融冰法可以有效地减少线路的过电流危害,同时也提高了线路的功率传送效率。
Transmission line de-icing based on skin effect of conductor and series resonance is presented. It increases the frequency of de-icing current to strength the skin effect of transmission lines, thus causing the line unit resistance increased and the de-icing current decreased with same heating power. By controlling the current frequency at the resonance point of the equivalent line inductance and resonant capacitor, the line becomes a resistive load and no reactive current is transferred on line. The structure of the cascaded multilevel de-icing device and its control methods, including carrier phase shifting space vector PWM modulation, adaptive frequency control, individual phase control, etc. are explained. The wiring diagrams are given. Case study shows that, the proposed de-icing method avoids the transmission line over-current effectively and improves the power transmission efficiency.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第2期6-9,共4页
Electric Power Automation Equipment
基金
国家"十一.五"科技支撑计划项目资助(2007BAA12803)
江苏省科技攻关项目资助(BE2006003)
国家电网公司防冰减灾科技立项项目资助~~
关键词
输电线路
高频集肤效应
串联谐振
除冰装置
级联型拓扑
transmission line
high-frequency skin effect
series resonance
de-icing device
cascade topology
