无功补偿的实质是减少无功在电网中的传送,降低电网的线路损耗,改善电网电压质量。 1 补偿原理及线损关系 在电网中,线路和变压器的可变功率损耗为:P=3I~2R10~(-3) 其中: 则:式中 △P——可变功率损耗; P——输送的有功功率损耗; U——电网运行电压; COSφ——负荷功率因数;损的关系为式中 cosφ_1——补偿前的功率因数; cosφ_2——补偿后的功率因数; 例:当COSφ由0.7提高至0.85时,可变损耗△P％可降低32％;由0.8提高至0.95时,△P％可降低29.1％, 2 无功补偿在降损方面的应用 我公司35kV输电线路清王线月有功电量450万kW·h,无功电 The essence of reactive power compensation is to reduce the transmission of reactive power in the power grid, reduce the power line loss and improve the grid voltage quality. 1 compensation principle and line loss relationship In the power grid, the variable power loss of the line and transformer: P = 3I ~ 2R10 ~ (-3) Where: Then: Where P - variable power loss; P - transport Of the active power loss; U - grid operating voltage; COSφ - load power factor; loss relationship in which cosφ_1 - power factor before compensation; cosφ_2 - power factor after compensation; To 0.85, the variable loss △ P% can be reduced by 32%; from 0.8 to 0.95, △ P% can be reduced by 29.1%, 2 reactive power compensation in the loss of the application of my company 35kV transmission line Qingwang monthly active Power 4.5 million kW · h, no power