摘要
500kV输电线路多采用分裂导线,因此常规的交流融冰方法难以提供足够的融冰电流。为解决500kV覆冰线路的融冰问题,提出了基于12脉动整流技术的高电压、大电流直流融冰方案。并根据500kV输电线路长度的多样性,采用了多档位调压、直流输出方式灵活组合的线路融冰方法。数学理论分析和系统仿真计算表明该方法能够满足不同长度的500kV输电线路的融冰电流需求。根据湖南500kV变电站线路参数,研制了满足15～50km的500kV线路融冰需要的大功率直流融冰装置,并进行了现场运行试验。试验结果为:现场试验波形与设计仿真波形一致,验证了系统模型仿真和理论分析的正确性;500kV线路导线温度从初始31.3°C升至42.9°C,温升11.6°C,温升明显;且直流融冰装置运行正常。试验结果表明,该方法可满足500kV分裂导线的融冰电流需要,电流热效应明显,可较好解决超高压输电线路的覆冰问题。
Because of the multi-splitting of the 500kV lines,conventional AC de-icing techniques can not provide enough current for de-icing.For the deicing of 500kV transmission lines,we presented a high-voltage and highcurrent DC de-icing method based on 12-pulse rectification by multilevel voltage regulation.Moreover,a combinable DC output voltage method was used according to the variety of transmission line length.Mathematical theory analysis and the system simulation indicated that the method could fulfill de-icing demands of different lengths of 500 kV line.According to the parameters of 500kV lines of a transformer substation in Hunan,a high-power DC deicing device based on the proposed method for de-icing 15～50km of 500kV line was developed and tested in-field on 500kV transmission lines.The test results show that the test waveforms are in accordance with the simulation waveforms,validating that the model simulation and theory analysis are correct;the conductor temperature obviously rises from 31.3°C to 42.9°C,and the operation of DC de-icing device is normal.Thus the presented method and device can provide high current for ice melting of 500kV multi-splitting lines which have obvious a thermal effect of current,and provide a solution for icing UHV lines.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2012年第11期3041-3047,共7页
High Voltage Engineering
关键词
500KV输电线路
直流融冰
12脉动整流
多档位调压
直流输出组合
装置
500kV transmission lines
DC de-icing
12-pulse rectification
multi-grade voltage regulation
DC output combination
device
