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For stubstation three - phase current source of asymmetric load. Based on the existing processing method based on, the author uses parallel compensation device to compensate， to obtain compensation system balancing current and impedance balance，namely asymmetric load and compensation reactance of star delta transformation of asymmetric load correction，and then on the basis of compensation of asymmetric current is equal to the load current conditions are repeated iteratively calculated accurately calculate unsymmetrical load. In this way，the system power factor is compensated by the load imbalance degree. Based on the case of a substation in Guangdong，the correctness of the method is proved by Matlab simulation. [ABSTRACT FROM AUTHOR]