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In order to solve the power quality problems mainly resulted from unbalanced load, an unbalanced load transversal compensation method of containing only capacitor banks which have unequal capacity of capacitors is proposed in this paper for the low-voltage three-phase four-wire distribution networks. This method allows a total or almost total balancing of active power and a complete compensation of reactive power of the unbalanced load. The structures of the compensators will conduce to some clear advantages such as small volume, low costs, simplified structures, high precision of compensation and easy control. This paper presents some practical simulation results, confirming the superiority of the method and practicality.