The influence of the grid power quality to the PV Inverter step-up transformer is analyzed in the actual operation. The formula for added loss calculation is given considering the influence of harmonic current, which is verified by an actual small-capacity transformer. The difference between PV inverter step-up transformer and ordinary power transformer is confirmed. The vector group for transformer is analyzed, and the reasonable vector group ofYd-11 is determined.%本文分析了光伏逆变器用升压变压器在实际运行中受并网电能质量的影响,并针对谐波电流的影响给出了损耗增加的公式,通过实际小容量变压器进行了验证,证实了光伏逆变器用升压变压器与普通电力变压器的区别。并针对变压器的连接组别进行了分析,确定合理的Yd-11连接组别。
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