Three-phase power cooperative management of distribution network with high distributed energy resources penetration

Abstract

With increasing penetrations of energy resources accessing, the problems caused by reverse power flow in the low-voltage network are aggravated. A power cooperative management method based on distributed optimization is proposed to optimize system operation by managing single-phase and three-phase distributed resources respectively. An optimization under-layer is proposed to minimize the voltage deviation and power loss, in which line parameters are removed to reduce topological dependence. An optimization upper-layer is proposed to constrain the power exchange of point of common coupling. Power correction factors are proposed to ensure power reduction consistency on each resource. Constraint coefficients are proposed to define the prioritize of optimization objectives under different conditions. Taking the photovoltaic system as an example, simulation is performed based on cases under three typical scenarios. Simulation results demonstrate that the proposed method could reduce voltage deviation and unbalance by upper-layer optimization, which as well as could constrain the power exchange in the point of the common coupling under scenarios with adequate illumination and without solar.

Keywords

• Power management
• Distributed optimization
• Low-voltage network
• High penetration
• Voltage balance