500kV变电站输电线路无功补偿容量的计算

随着电网负荷的加重，广东许多500kV变电站都需要加装容性无功补偿装置。系统无功消耗增加的一个重要原因是重负荷下输电线路的无功损耗增加。在分析了线路无功损耗变化规律的基础上，利用线路的传输特性方程，得出了传输负荷与线路无功损耗之间的关系，提出了线路无功补偿容量的实用计算方法。利用该计算方法计算了500kV蓄北线在不同运行方式下两端变电站无功补偿的容量，以及50％负荷率下北郊站500kV侧各条线路的无功功率。

Computation of the Reactive Power Compensation Capacity of 500kV Substation for the Transmission Line

As the load increases in the power grid,the reactive power compensation devices should be added in Guangdong many 500kV substations.An important reason for increasing of system reactive power consumption is the reactive power loss increasing on transmission line during the heavy load condition.Based on regular pattern of the reactive power loss on line and the equation of line transmission characteristic,relation between transmission load and reactive power loss on lines is educed,and calculating way for line reactive power compensation capacity is provided in this paper.By this way,the reactive power compensation capacities of both substations on 500kV Xu-Bei line are calculated out under different operating modes,and the reactive power on each 500kV outgoing line is given under 50% load factor.