Power Island resynchronisation for distribution grids

As renewable generation reaches higher penetration in distribution networks, parts of the grid may be subject to planned, and unplanned islanding with associated costs for reconnection. In the UK, islanded operation is currently prohibited, however in Spain where this project was implemented, it is permitted if it is controlled by the distributor, and current trends show that wider legislation may change as technological advancements and commercial merits of islanded operation are realised.

Working with i-DE and their industrial partners, Ingeteam and Zigor, SMPnet successfully showcased the use of Omega technology to re-synchronise a power island with the main grid, under a series of operational scenarios.

What we did

SMPnet followed a multi-stage approach to deliver this project:

• Identify limitations of existing technologies and engage with involved manufacturers to propose state-of-the-art solution to the problem
• Tailor Omega for island resynchronisation ensuring that equipment from different manufacturers perform as a single unit
• Evaluate the proposed solution through offline simulations
• Showcase results and receive feedback
• Incorporate client feedback into further development and finalise design
• Tested product in Ingeteam facilities against a series of operational scenarios and delivered final results.

What we showed

SMPnet showcased power island re-synchronisation under a series of operational, real-world scenarios. The results were processed, analysed and plotted to show how the technology was successfully operated.

A typical response to managing power island reconnection is to shut down the power island, close the circuit breaker(s) and gradually restore power within the power island. This process has often involved diesel generators as they exhibit enhanced controllability features.

This project showed how Omega helps network operators avoid shut down of the islanded grid during reconnection with associated benefits:

• Remote operation (no need for dispatching personnel to manage shut down/ resynchronisation)
• Millisecond control (replacing need for diesel generators)
• Clean operation (no dependence on fossil fuel generators)
• Compatible and coordinated resynchronisation of equipment from different manufacturers
• No shut down impact on network users and customers.

Summary

This project was launched by i-DE to search for innovative solutions to promote synchronisation systems in remote points, adapted to the needs of the distribution grid.  Working with the client and industrial partners, SMPnet showcased a tangible solution into an imminent network issue, that of remote, clean, safe and economic reconnection of a power island to the main grid.

SMPnet developed and benchmarked a ready-to-deploy solution to the challenge posed by the client and are working with i-DE to deploy the system at additional points within their network and a number of substations in Spain.

* This project was part of Iberdrola’s International Startup Programme 2021/2 - PERSEO, and the Global Smart Grids Innovation Hub of i-DE, in collaboration with Energy Systems Catapult and the Department for International Trade (Spain).