Hybrid Open Points: an Efficient Tool for Increasing Network Capacity in Distribution Systems

TL;DR

This paper proposes the Hybrid Open Point (HOP), a novel device combining a switch and a power converter to enhance distribution network capacity efficiently, replacing traditional open points with a cost-effective solution.

Contribution

Introduction of the Hybrid Open Point (HOP), a new device that combines switching and power conversion to increase network capacity more cost-effectively than existing solutions.

Findings

HOP provides secure network capacity at lower cost.

HOP can replace traditional open points in distribution systems.

Various interconnection configurations are feasible with HOP.

Abstract

This letter introduces the Hybrid Open Point (HOP), a device consisting of an electromechanical switch connected in parallel with a power converter, for the purpose of providing additional network capacity in interconnected distribution systems. The HOP switch is used for bulk power transfer at low-cost, whilst the HOP converter provides targeted power transfer when the HOP switch is open. The device can replace either a Normally Open Point (Type 1 HOP) or a Normally Closed Point (Type 2 HOP). Simple interconnection and teed interconnection configurations are studied considering fault level and radiality constraints, with realistic use-cases identified for both HOP types. The HOP is shown to provide secure network capacity more cost-effectively than the classical Soft Open Point.