Grid Connected PV with Storage System Simulation for Distribution Grid Supporting

摘要

Grid-connected battery-based storage systems allow several applications for distribution grids and it have been widely discussed today. This work applies some features of a DC-AC converter using a grid connected 471. 5kWp photovoltaic system with an integrated storage system. Focusing in details for developing simulations of this system type, a single-phase inverter model was designed with: a DC-DC buck converter to PV power dispatch control, a bidirectional DC-DC buck-boost converter for battery charging and discharging and a single-phase NPC full-bridge for 4. 16kV connected through a transformer to 13.8kV distribution grid. In addition, it presents the applied local loads behavior, control strategies and converters design. As a result, a photovoltaic inverter with storage system and its operation for distribution grid supporting is presented which means, to provide ancillary services to the grid, such as: local load power factor compensation and an hourly-basis active power dispatching. Thus, allowing mitigation of transmission and distribution technical losses and improvements in voltage profile. Simulation results demonstrated an approach to delivering active and reactive power for medium voltage distribution grids maintaining the source at unity power factor.