【摘要】 主回路参数计算是直流输电工程设计的重要组成部分。特高压直流工程每极由2个12脉动换流器串联接线,直流系统运行方式灵活。依据特高压直流输电理论和直流系统特点,对溪洛渡—浙西±800 kV 7 500 MW特高压直流工程的主回路参数进行设计研究。计算结果给出了2端换流站的主要设计参数:平波电抗器电感值取4×75 mH,并采用平抗分置方式;换流变压器均采用单相双绕组变压器;换流变短路阻抗均取为19%;额定容量分别为378.5和358.4 MVA;额定相电压分别为171.3和162.2 kV;分接头档位分别设置为+21/-6和+24/-4;绝对最大空载直流电压分别为239.0和227.0 kV。这些结果将为该特高压工程后续的各项研究提供依据,也可以为其他特高压直流工程的设计提供参考。更多还原

【Abstract】 The calculation of main circuit parameters is an important constituent part in the design of HVDC transmission projects.Each pole of the ±800 kV 7 500 MW DC power transmission project from Xiluodu to Zhexi is composed of two sieries connected 12-pulse converters,thus the operation modes of the DC transmission project can be flexibly regulated.According to the theory of UHVDC power transmission and the features of DC system,main circuit parameters of the DC transmission project is studied and designed.Following main design parameters of converter stations at both ends of the DC transmission project are obtained from the calculation results: inductance of smoothing reactor for each pole of each station is 4×75 mH,this 4×75mH inductance is splitted into two equal parts,one part is connected to pole bus and the other is connected to neutral bus;the converter transformers are composed of single-phase two-winding tranformers,at Xiluodu side the rated capacity of each single-phase tranformer is 378.5 MVA and its rated phase voltage is 171.3 kV and at Zhexi side the rated capacity of each single-phase tranformer is 358.4 MVA and its rated phase voltage is 162.2 kV,the short-circuit impedances of converter transfomer are 19% for both ends of the project while the tap changer is not adjusted;the number of transformer taps is set to +21/-6 at Xiluodu side and +24/-4 at Zhexi side,and voltage difference between two adjacent taps is 1.25% of the rated votlage at both sides;the absolute maximum no-load DC votlage 239.0 kV at Xiluodu side and 227.0 kV at Zhexi side.These data can be used as the foundation for subsequent research item of this project and is available for reference to other UHVDC transmission projects.更多还原