超高压直流(high voltage direct current,HVDC)输电线路离子流场的计算对于输电线路的设计具有重要意义。然而考虑地电位升高的地面离子流场的计算却很少,为此,在Deutsch假设的基础上,为了研究计及地电位升高时HVDC输电线路产生的离子...超高压直流(high voltage direct current,HVDC)输电线路离子流场的计算对于输电线路的设计具有重要意义。然而考虑地电位升高的地面离子流场的计算却很少,为此,在Deutsch假设的基础上,为了研究计及地电位升高时HVDC输电线路产生的离子流场,将地电位升高作为第1类边界条件,应用模拟电荷法,建立了考虑地电位升高影响的HVDC输电线路下方离子流场计算模型。计算结果表明,在不计及地电位下,与可查询的文献相比,计算结果与其基本一致。计及地电位下,地面离子流密度与电场的值分别有所增大,同时分析了不同地电位升高值、导线高度及极间距下,地电位的变化对超高压输电线路地面合成电场以及离子流场的影响。展开更多
采用Deutsch假设法,研究了不同组合架设方式下同塔双回高压/特高压直流输电线路地面合成场强的分布特性。结果表明:Deutsch假设计算结果与实测结果较吻合,适用于双回直流线路的预测。高压/特高压直流线路同塔双回架设时,因空间离子流场...采用Deutsch假设法,研究了不同组合架设方式下同塔双回高压/特高压直流输电线路地面合成场强的分布特性。结果表明:Deutsch假设计算结果与实测结果较吻合,适用于双回直流线路的预测。高压/特高压直流线路同塔双回架设时,因空间离子流场的相互影响,地面合成场强分布与塔型和导线布置方式有较大关系。±800 k V特高压直流线路位于上层、极导线采取+-/-+方式布置时,地面合成场强最大值相比采取-+/-+方式布置增加了17%;±800 k V特高压直流双极线路位于杆塔同一侧、极导线采取++/--方式布置时,地面合成场强最大值相比采取+-/-+方式布置时增加了9%;相同的高度、不同的塔型,地面合成场强最大可增加18%。上下层导线间距的变化对地面最大合成场强值的影响较小。同时,计算给出了不同塔型线路架设最小高度建议值。展开更多
As the transmission line corridors become more and more rare in China,it is now inevitable for people to construct HVAC-HVDC hybrid transmission lines.The research on the electric field around the transmission lines p...As the transmission line corridors become more and more rare in China,it is now inevitable for people to construct HVAC-HVDC hybrid transmission lines.The research on the electric field around the transmission lines plays an important role in evaluating the electromagnetic environment nearby.However,few existing research now considered the mutual effect of HVAC-HVDC hybrid transmission lines.Thus,this research designed a program based on windows,which calculated the surface voltage gradient on the transmission lines and the electric field at ground level respectively.This research calculated the surface voltage gradient on the transmission lines by applying the improved method of successive images.For the electric field at ground level under AC transmission line,simulation charge method is used,while for the electric field at the ground level under DC transmission lines,deutsch assumption method is used.Comparing the results generated by the calculation with those in published literature,the program is reliable.Taking 500 kV transmission lines as an example,when considering the mutual effect of the HVAC-HVDC lines,the amplitude of the surface voltage gradient will increase by about 10%and the amplitude of the electric field at ground level will increase by about 8%,making the mutual effect of the AC and DC lines unneglectable. Larger part of the electric field at ground level under hybrid lines is produced by the DC line.Thus,in order to control the electric field at ground level under hybrid lines,it should pay more attention on that produced by the DC line.展开更多
用数学方法严格证明,在存在空间电荷及其产生的离子流矢量J的无风高压直流(high-voltage direct current,HVDC)系统中,如果离子迁移率为常数,并且离子扩散电流不存在或离子扩散电流平行于漂移电流,离子扩散系数为常数,则稳态时J的方向...用数学方法严格证明,在存在空间电荷及其产生的离子流矢量J的无风高压直流(high-voltage direct current,HVDC)系统中,如果离子迁移率为常数,并且离子扩散电流不存在或离子扩散电流平行于漂移电流,离子扩散系数为常数,则稳态时J的方向与该系统不存在空间电荷时的电场矢量E0的方向相同。由于这时J的方向与实际电场矢量E的方向相同,所以E的方向与E0的方向相同,但两者的幅度则不一样,这就是著名的Deutsch(第一)假设。不满足上述条件时,Deutsch假设不能在数学上严格成立。文中还讨论了这些限制条件与HVDC系统结构以及离子流场电气参数的关系。展开更多
文摘超高压直流(high voltage direct current,HVDC)输电线路离子流场的计算对于输电线路的设计具有重要意义。然而考虑地电位升高的地面离子流场的计算却很少,为此,在Deutsch假设的基础上,为了研究计及地电位升高时HVDC输电线路产生的离子流场,将地电位升高作为第1类边界条件,应用模拟电荷法,建立了考虑地电位升高影响的HVDC输电线路下方离子流场计算模型。计算结果表明,在不计及地电位下,与可查询的文献相比,计算结果与其基本一致。计及地电位下,地面离子流密度与电场的值分别有所增大,同时分析了不同地电位升高值、导线高度及极间距下,地电位的变化对超高压输电线路地面合成电场以及离子流场的影响。
文摘采用Deutsch假设法,研究了不同组合架设方式下同塔双回高压/特高压直流输电线路地面合成场强的分布特性。结果表明:Deutsch假设计算结果与实测结果较吻合,适用于双回直流线路的预测。高压/特高压直流线路同塔双回架设时,因空间离子流场的相互影响,地面合成场强分布与塔型和导线布置方式有较大关系。±800 k V特高压直流线路位于上层、极导线采取+-/-+方式布置时,地面合成场强最大值相比采取-+/-+方式布置增加了17%;±800 k V特高压直流双极线路位于杆塔同一侧、极导线采取++/--方式布置时,地面合成场强最大值相比采取+-/-+方式布置时增加了9%;相同的高度、不同的塔型,地面合成场强最大可增加18%。上下层导线间距的变化对地面最大合成场强值的影响较小。同时,计算给出了不同塔型线路架设最小高度建议值。
文摘As the transmission line corridors become more and more rare in China,it is now inevitable for people to construct HVAC-HVDC hybrid transmission lines.The research on the electric field around the transmission lines plays an important role in evaluating the electromagnetic environment nearby.However,few existing research now considered the mutual effect of HVAC-HVDC hybrid transmission lines.Thus,this research designed a program based on windows,which calculated the surface voltage gradient on the transmission lines and the electric field at ground level respectively.This research calculated the surface voltage gradient on the transmission lines by applying the improved method of successive images.For the electric field at ground level under AC transmission line,simulation charge method is used,while for the electric field at the ground level under DC transmission lines,deutsch assumption method is used.Comparing the results generated by the calculation with those in published literature,the program is reliable.Taking 500 kV transmission lines as an example,when considering the mutual effect of the HVAC-HVDC lines,the amplitude of the surface voltage gradient will increase by about 10%and the amplitude of the electric field at ground level will increase by about 8%,making the mutual effect of the AC and DC lines unneglectable. Larger part of the electric field at ground level under hybrid lines is produced by the DC line.Thus,in order to control the electric field at ground level under hybrid lines,it should pay more attention on that produced by the DC line.
文摘用数学方法严格证明,在存在空间电荷及其产生的离子流矢量J的无风高压直流(high-voltage direct current,HVDC)系统中,如果离子迁移率为常数,并且离子扩散电流不存在或离子扩散电流平行于漂移电流,离子扩散系数为常数,则稳态时J的方向与该系统不存在空间电荷时的电场矢量E0的方向相同。由于这时J的方向与实际电场矢量E的方向相同,所以E的方向与E0的方向相同,但两者的幅度则不一样,这就是著名的Deutsch(第一)假设。不满足上述条件时,Deutsch假设不能在数学上严格成立。文中还讨论了这些限制条件与HVDC系统结构以及离子流场电气参数的关系。
