|为进一步降低直流输电系统的网损,提高直流输电系统的经济性,有必要对直流输电系统的网损进行定量计算。直流换流站网损的计算是直流输电系统网损计算的难点。基于IEC 61803标准提出了换流站各电气设备损耗的计算方法,对不同运行方式下、不同负荷水平下的换流站运行损耗进行计算。计算的原理是分别计算换流站内各设备的损耗,然后总加起来得到换流站的总损耗。采用Visual Basic 6.0编制了换流站损耗的计算软件,结合实际的直流输电工程计算其换流站损耗,发现换流站的损耗主要来源于阀和换流变这2个设备,整流站的总损耗大于逆变站的总损耗。
|Loss study of HVDC system
LI Zhan-ying REN Zhen CHEN Yong-jin
|It is necessary to quantitatively calculate the losses of HVDC system to reduce its loss and improve its economy.It is difficult to calculate the loss of converter station in HVDC system.According to IEC 61803 of Determination of power losses in high-voltage direct current(HVDC) converter stations,the loss calculation models of converter station equipments under different operation conditions are established.The total loss of converter station is the sum of equipment losses,which are calculated separately.Visual Basic 6.0 is used to develop the loss calculation program.The converter station loss calculation for a real HVDC transmission project reveals that,losses of the converter station mainly come from valves and converter transformers,and the total loss of the rectifier station is larger than that of the inversion station.
|Key words: HVDC,converter station,loss calculation