Energy Management Strategy and Control Method of Hybrid Distribution Network Based on Soft Open Point

The energy management and control method of the AC/DC hybrid distribution network based on the soft open point (SOP) is a key technical challenge to ensure its high efficiency, reliability, flexibility and controllability. In order to reduce the unnecessary switching power of SOP and maximize the use of renewable energy, a new energy management strategy is proposed. The strategy gives priority to the use of renewable energy output power, and is supplemented by the mutual support of the AC/DC sub network energy storage. The grid-connected operation of the AC/DC hybrid distribution network is divided into twenty operation modes. Based on the energy management objectives, the reference instructions of the AC/DC sub network energy storage units in different operation modes are generated. Aiming at the problems of traditional droop control voltage drop and circulating current of parallel converters with the common AC/DC bus, the AC bus voltage drop compensation method and circulating current suppression method are given. Finally, a simulation platform of the AC/DC hybrid distribution network based on SOP interconnection is established by simulation software. The simulation results verify the feasibility and effectiveness of the platform. © 2021 Automation of Electric Power Systems Press.