特高压输电线路串并联补偿方案研究

针对特高压输电系统远距离、大容量输电的特点,以提高线路输电容量,解决电压和无功控制困难为目的,提出了基于分布参数模型的特高压输电线路串并联补偿方案。该方案考虑了串并联补偿之间的相互影响,利用串并联补偿迭代步骤,最终确定串并联补偿地点和容量。考虑到特高压输电线路中电晕损耗占线路总损耗的比重较大,为使结果更符合实际情况,计算电晕损耗时应该考虑实际的输电环境。根据已有的电晕损耗计算公式,修正了线路参数电导的取值。最后对一条输电线路进行了计算,得出的串并联补偿方案能够有效地提高线路输电容量,证实了文中所提串并联补偿方案的有效性和应用中应考虑实际输电环境的必要性。本方案的提出也为可控补偿的研究提供思路。

Study on the Series/Parallel Compensation Scheme of UHV Transmission Line

In order to enhance the transmission capability and to solve the problem of voltage stability and reactive power compensation,this paper presents a series/parallel compensation scheme of UHV transmission lines based on the distributed parameter model to cater for the features of a UHV power transmission system,such as long distance and large transimission capacity.This scheme takes into account the relationships between the series and the parallel compensations,and determines the compensation capacity and installation points by using series/parallel compensation iterations.Due to the fact that the corona loss takes a significant part of the total line loss,in order to calculate the corona loss more accurately,the transmission environment should be taken into consideration.In addition,this paper modifies the line parameter conductance in the given formulae of corona loss.Finally,the proposed the scheme has been applied to a real set of transmission lines and the results show that the transmission capability was effectively enhanced,which convinces the applicability of the scheme and the necessity of considering transmission environment.Furthermore,the proposed scheme could be a useful reference for the studies of controllable compensation.