| 引用本文: | 陆佳政,朱思国,李波,等.特高压输电线路直流融冰变流系统设计[J].电力系统保护与控制,2014,42(11):124-129. |
| LU Jia-zheng,ZHU Si-guo,LI Bo,et al.DC ice-melting converter system design for EHV transmission line[J].Power System Protection and Control,2014,42(11):124-129 |
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| 摘要: |
| 随着特高压的推广，特高压输电线路的抗冰融冰正成为研究的热点。特高压输电线路由于线径粗、线路长，所需融冰电流与装置容量大，其电流融冰是一个研究的难点。针对特高压输电线路的特点提出了分段直流融冰方法，其将特高压输电线路分成若干段，选取重覆冰区的线路段设置直流融冰点与融冰短路点，可以有效减小融冰装置容量。针对特高压输电线路融冰所需直流融冰装置容量大特点，为了减小融冰装置网侧电流的谐波畸变率，采用24脉波整流变压器+多台整流器并联方式，可以有效减小直流融冰装置对网侧电源的干扰，并可减小输出直流电压纹波因数。最后对所设计的特高压输电线路直流融冰装置进行了仿真研究，采用24脉波整流变压器+多台整流器并联方式后，可以有效消除整流器引起的输入侧电流中5次和7次谐波电流，整流变压器输入侧电流低次谐波总畸变率仅为0.51%，输出直流电压脉波数为24，电压纹波因数仅为0.616。仿真结果证明了所设计特高压直流融冰装置的可行性与正确性。 |
| 关键词: 特高压 分段直流融冰 谐波畸变率 24脉波整流变压器 电压纹波因数 |
| DOI：10.7667/j.issn.1674-3415.2014.11.020 |
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| DC ice-melting converter system design for EHV transmission line |
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LU Jia-zheng, ZHU Si-guo, LI Bo, FANG Zhen, ZHANG Hong-xian
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Power Transmission and Distribution Equipment Antiicing and Reducing-disaster Technology Laboratory of State Grid, Hunan Electric Power Corporation Research Institute, Changsha 410007, China
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| Abstract: |
| With the development of extra-high voltage (EHV), ice melting of EHV transmission line is becoming a research hotspot. The ice-melting device requires large current and capacity for EHV transmission line because of big line diameter and long lines, so the current ice melting is a research difficulty. According to the characteristics of EHV transmission line, the piecewise DC de-icing method is proposed for EHV transmission line which is divided into several segments. The way can effectively reduce the capacity of the ice-melting device by setting DC ice melting point and short circuit point to the line segment of the repeat ice thawing freezing. The de-icing of EHV transmission line needs big DC ice-melting device capacity. In order to reduce the current harmonic distortion rate of melting ice device’s net side, the way using 24 pulse rectifier transformer plus rectifiers is used which can effectively reduce the interference on the grid side power caused by DC de-icing device and decrease the output DC voltage ripple factor. Finally the simulation research on the design of DC ice-melting device for EHV transmission line is taken. The 5th and 7th input harmonic current caused by rectifier can effectively be eliminated using 24 pulse rectifier transformer plus multiple rectifiers parallel mode. The low current total harmonic distortion rate of rectifier transformer’s input current is only 0. 51%. The pulse number is 24 and the voltage ripple factor is only 0. 616 for the output DC voltage. The simulation results prove the feasibility and the correctness of the DC ice-melting device’s design for EHV. |
| Key words: extra-high voltage (EHV) piecewise DC de-icing harmonic distortion rate 24 pulse rectifier transformer voltage ripple factor |
