CIRCA Group Europe (Ireland)

This paper presents an innovative approach for a black start procedure following a blackout event considering a solid-state transformer with a coupled storage system. The solid-state transformer has been highlighted as a promising solution to enhance power management and power quality in distribution grids. Under a three-stage configuration (AC/DC-DC/DC-DC/AC), the solid-state transformer can replace the traditional low-frequency transformer in MV/LV substations. With storage coupled to the DC link of the solid-state transformer, it can be envisioned as the main black start unit (grid-forming unit), which enables to launch of a service restoration process in the distribution grid. The proposed black start procedure for the distribution grid with a solid-state transformer is demonstrated through a set of dynamic simulations performed in MATLAB/Simulink.

Planning studies are an essential component for ensuring cost effective and timely distribution system upgrades and expansion. A significant change occurring across the industry is increasing focus on emerging technologies that may be able to offset the need for expensive system upgrades and help meet other system objectives. These non-traditional solutions, referred as non-wires alternatives, are expected to increase the complexity of the simulations and studies needed as part of the overall planning process. This paper discusses the inclusion of demand side management programs into modern distribution planning for relieving thermal violations during a forecasted time horizon. This alternative has proven to be effective technically and economically for scenarios in which feeders are not heavily overloaded or have been partially relieved in combination with other technologies, depicting a practical investment plan for helping utilities reach their business and service goals.