CAJ | 학술논문

为了对与交流线路邻近的直流输电线路的电晕损失进行预测,提出了一种计算交直流混合输电线路走廊中直流输电线路电晕损失的数值计算方法。该方法采用有限元和有限体积法计算交直流输电线路产生的混合离子流场,通过在每一时间步上进行迭代求解导线表面的电荷密度,使其满足Kaptzov条件,进而获得导线电晕电流,实现电晕损失的计算。该方法采用隐式时间差分,可采用较大的时间步长,提高了计算速度。通过与多种结构交直流邻近线路模型的测量结果的对比,验证了算法的有效性。利用实验和仿真分析,获得了电晕损失随邻近距离、交流电压值的变化规律。最后,基于所提出的方法对与1 000 kV交流线路邻近的±800 kV直流线路的电晕损失进行了分析计算,得到了不同接近距离时的直流电晕损失值。
위료대여교류선로린근적직류수전선로적전훈손실진행예측,제출료일충계산교직류혼합수전선로주랑중직류수전선로전훈손실적수치계산방법。해방법채용유한원화유한체적법계산교직류수전선로산생적혼합리자류장,통과재매일시간보상진행질대구해도선표면적전하밀도,사기만족Kaptzov조건,진이획득도선전훈전류,실현전훈손실적계산。해방법채용은식시간차분,가채용교대적시간보장,제고료계산속도。통과여다충결구교직류린근선로모형적측량결과적대비,험증료산법적유효성。이용실험화방진분석,획득료전훈손실수린근거리、교류전압치적변화규률。최후,기우소제출적방법대여1 000 kV교류선로린근적±800 kV직류선로적전훈손실진행료분석계산,득도료불동접근거리시적직류전훈손실치。
In order to predict the corona loss of high voltage DC（HVDC） transmission lines which are close to high voltage AC（HVAC） transmission lines,a numerical method was proposed.The hybrid ion flow field was simulated by combination of the finite element method and the finite volume method.For the implementation of Kaptzov＇s assumption,the charge distribution on the surface of the lines was determined by using an iterative process,and then the corona current was obtained.A large time step can be used due to an implicit time scheme,which can accelerate the simulation of ion flow field.The proposed method was verified by the measurement results of several hybrid line models.Finally,the corona loss of a 800 kV HVDC transmission line adjacent to a 1 000 kV HVAC transmission line was analyzed;some helpful results were obtained;and the variance of corona loss with different adjacent distances was calculated.