Abstract
The two-input single-phase transformer is widely used in the 10kV power distribution system. However, this power supply mode has the disadvantage of the 10kV side three-phase unbalance problem. In response to this problem, the paper proposes a new 220V single-phase low-voltage power supply system based on a three-input single-phase transformer. The power supply system consists of a three-phase transformer and a two-phase transformer and a phase-to-phase power controller. The three-phase to two-phase transformer is used to realize two low-voltage single-phase power supply, and the phase-to-phase power controller is used to realize the negative sequence and harmonic control of the low voltage side. This power supply mode is suitable for large-capacity low-voltage power supply systems with single-phase load intensive. The paper analyzes the transformation theory and control strategy of the power supply mode. Finally, the superiority and effectiveness of the proposed technical scheme and control strategy are verified by simulation analysis.
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