Abstract
Due to the lack of phase angle information in the low-voltage (LV) distribution network, the existing three-phase power flow calculation methods in LV distribution network assume that the voltage phase angle of the slack bus is symmetric. In practice, the LV side of the actual distribution transformer is often asymmetric. Based on the actual smart meter measurements, taking phase A of the slack bus as zero phase reference point, the PV and PQ model of phase B and phase C for the slack bus are constructed. Considering the actual access mode and control mode of the photovoltaic inverter power supply (PIPS) in the LV distribution network, a more realistic power and voltage independent control model of three phase relative to the neutral point is established. Based on the above two constructed models, three-phase power flow model of low-voltage distribution network considering phase asymmetry and photovoltaic access is further proposed. The effectiveness of the model built in this paper is verified on the modified IEEE-13 bus distribution system. The simulation results show that the model constructed in this paper can effectively and accurately calculate the three-phase power flow in the LV distribution network.
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