特高压同塔双回线路分段融冰装置感应电压、电流的抑制措施  

Suppression Measures for Induced Voltage and Current of Deicer of UHV Double-circuit Transmission Line

作　　者：余占清[1] 郭志冲 陆佳政[2] 谭艳军[2] 何金良[1] 胡军[1] 

机构地区：[1]清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室,北京100084 [2]湖南省电力公司科学研究院,长沙410007

出　　处：《高电压技术》2014年第5期1332-1338,共7页High Voltage Engineering

基　　金：国家自然科学基金(50907036);国家重点基础研究发展计划(973计划)(2011CB209403);Project supported by National Natural Science Foundation of China(50907036);National Basic Research Program of China(973 Program)(2011CB209403)

摘　　要：为抑制感应电压、电流对输电线路分段融冰装置的影响,以Bergeron模型为基础搭建了1 000 kV同塔双回线路直流融冰仿真模型。分析了感应电压和感应电流对设备的应力、融冰装置电源以及三相桥换相的影响,并将4种抑制感应电流措施的效果进行了比较。研究结果表明,当采用上下相融冰接线方式时,融冰装置端口处的感应电压和感应电流约为上中相、中下相接线的2倍;并联电容、并联工频谐振滤波器对感应电流的抑制效果有限;串联电感能有效削减回路中的工频电流,当串联电感为1 H时,回路中的工频电流为不串电感时的20%,电网侧二次谐波电流为不串电感时的14%。因此,可采用上中相、中下相的接线方式,以及在出口处串联电感来抑制融冰装置的感应电压、电流。In order to suppress the influence of induced voltage and induced current on segmented ice-melting devices of transmission lines, we analyzed this influence on equipment stress, power of ice-melting deicer, and three-phase bridge commutation using a DC ice-melting simulation model of 1 000 kV double-circuit transmission line on the same tower, which is built on the basis of the Bergeron model. Furthermore, we compared the effects of four measures on suppressing the induced current in ice-melting devices. The results show that, the induced voltage and current of deicers connecting upper and lower phases as the ice-melting connection mode are about twice as much as those using the upper-middle and middle-lower phase connections. The parallel capacitance and parallel power-frequency resonance-filter methods have limited effects for suppressing induced current. Moreover, the series inductance method can effectively weaken the frequency current in the loop： for example, installing series inductance of 1 H can reduce the power-frequency current in the loop and the second harmonic current of the grid side by 80% and 86%, respectively. Therefore, it is suggested using the middle-lower or upper-middle phase connection, and installing series inductance at the output terminal of deicers to suppress induced voltage and induced current in the deicers.

关 键 词：融冰装置 同塔双回线路 Bergeron模型 感应电压 感应电流 抑制措施 

分 类 号：TM752[电气工程—电力系统及自动化]