Abstract
Balanced three-phase four-wire or five-wire distribution networks can accommodate more photovoltaic (PV) generators and electric vehicles (EVs). In this paper, two platforms with different structures and costs are proposed to connect the dc sides of adjacent PV inverters and EV chargers in different phases to a common dc bus. Through these two platforms, the load can be transferred from the highly loaded phase to the less loaded phase. Two mixed integer quadratic programming models of coscheduling PV inverters and EV chargers are formulated to minimize network losses with load balancing. The proposed method is compared with the uncoordinated charging scenarios and the classic method with the aim of minimizing the three-phase load variance. The proposed optimization model is evaluated by an actual 213-bus simulation system. It is shown that the proposed method not only performs good convergence with less computational time but also reduces power losses and load variance. Moreover, the load balance and voltage profile are also improved.
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