Jun 11, 2020

Digital grids: turning energy uncertainty into opportunity

Schneider Electric
Digital grids
Alexandre Golisano, Strategy D...
5 min
Abstract grid
Three trends rule the energy sector – decarbonisation, decentralisation, and digitisation...

Three trends rule the energy sector – decarbonisation, decentralisation, and digitisation.

To meet the UK’s environmental and sustainability goals, it has become imperative to decarbonise the grid, incorporating a large proportion of low carbon sources into the energy mix.

This is transforming our system of energy generation from a centralised system to a decentralised model, comprised of small pockets of generation from wind farms, solar panels and even electric vehicle batteries. To incorporate these changes, the grid is becoming more digitised - moving towards a two-way flow of energy where ‘prosumers’ play an active part in grid balancing and energy management.

To protect the digital assets of this new, omnidirectional grid, distributed services operators (DSOs) and distributed network operators (DNOs) must improve and modernise their protection relay solutions, whether it’s through installing new relays or retrofitting existing equipment with smart capabilities. This will save operators money by making maintenance easier, protecting staff from arc flashes and safeguarding the other equipment in their networks.

Out with the Old

Protection relays are digitally operated switches that trip a circuit breaker when a fault or issue has been detected, preventing further problems. It is critical in preventing abnormal activity or adverse conditions that risk damaging important and expensive equipment. Ultimately, protection relays are protection for power systems, there to ensure a continuity of service which protects your employees and the power security of end-users. So, why implement smart protection relays, and what are the drawbacks of legacy solutions.

Power security is critical for consumers relying on utilities for their energy supply. Faults and issues at substations can cause blackouts and major disruption. To make energy supply more resilient and reliable, problems need to be identified, located and resolved rapidly. Although so-called digital relays have been the industry norm for several years, they are often imprecise, not showing the location of the fault and making it more difficult to find and resolve.

Safety is an area that will be better developed with a smart solution. Detecting a problem early contributes to keeping your employees and equipment safe. The longer a fault or problem persists the worse it will get, increasing the chances of a dangerous arc fault or flash (dangerous explosions that result from circuit damage). A more efficient solution network will be able to detect faults before they become problematic.

Cybersecurity is a new consideration for energy operators. Equipment damage is no longer the only danger facing utilities. The energy network is now a target for a wide range of cybercriminals and state actors. Having digital relay solutions is no longer enough – they also need to be cybersecure.

With modern energy use, one weak link could have a calamitous effect - compromising stability, and the optimum delivery and storage of energy. Subsequently, we are at a stage where traditional relay solutions are no longer enough. Today a more connected offering is required if energy operators are to deliver on the next level of service expected by consumers, such as cheaper energy prices for variable-voltage overnight EV charging which allows operators to reduce grid load.

Upgrading Protection

As energy the energy mix becomes more diverse, maintaining the integrity of these next-gen network grids will require efficient, advanced relays that work to minimise downtime by automating processes. Add to that, the rare but recognised risk of security means that utility companies must upgrade protection relays to enhance safety and minimise the loss of costly equipment.

One of the major benefits of a connected solution, is that it allows utilities to exploit a system of ‘predictive maintenance’. Most utilities follow a ‘preventative maintenance’ approach where equipment is checked by technicians/ engineers on a regular but strictly scheduled basis. The problem with this approach is that the likelihood of solving an issue, such as a minor fault or physical damage to the equipment, is left purely to chance.

You can’t respond to issues in real-time, you simply hope a technician finds the problem the next time they perform their checks. In the meantime, that minor fault could snowball into a business interrupting crisis. This could be anything from a power cut that leaves millions without power, to an arc flash which risks personnel safety and the integrity of equipment in a whole facility.

What’s worse is that after the crisis is over you need to then pay for repair costs. These are usually much more expensive than traditional maintenance due to the amount of work involved and potential need to replace a whole section of your facility’s energy grid.

With a connected solution – like a connected protection relay – utilities can monitor equipment condition in real-time. Any issues, software problems or faults will be flagged immediately and sensors within the cabinet can shut down operations within milliseconds. This allows operators to be proactive and schedule maintenance when equipment actually needs it, resulting in less frequent but more effective maintenance. Operators can react to problems in progress and, based on the data collected from equipment, even predict when the next round of maintenance is required. This approach avoids unnecessary and dangerous crises and creates cost efficiencies, both in terms of maintenance and repairs.

Reducing costs and boosting efficiency through hastening the fault detection and resolution processes, are critical to optimising energy networks by doing more with less. This is where smart protection relays play their part, enabling DSOs to deliver a more reliable supply to end-users. Those that are embracing this digitally enabled approach to provide an enhanced service to end-users, are well on the way to improving grid resilience and meet the future of a connected, carbon neutral grid.

This article was contributed by Alexandre Golisano, Strategy Director Power Systems UK & Ireland at Schneider Electric.

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Jul 30, 2021

Major move forward for UK’s nascent marine energy sector

3 min
The UK’s nascent marine energy sector starts exporting electricity to the grid as the most powerful tidal turbine in the world begins to generate power

Although the industry is small and the technologies are limited, marine-based energy systems look to be taking off as “the world’s most powerful tidal turbine” begins grid-connected power generation at the European Marine Energy Centre

At around 74 metres long, the turbine single-handedly holds the potential to supply the annual electricity demand to approximately 2,000 homes within the UK and offset 2,200 tonnes of CO2 per year.

Orbital Marine Power, a privately held Scottish-based company, announced the turbine is set to operate for around 15 years in the waters surrounding Orkney, Scotland, where the 2-megawatt O2 turbine weighing around 680 metric tons will be linked to a local on-land electricity network via a subsea cable. 

How optimistic is the outlook for the UK’s turbine bid?

Described as a “major milestone for O2” by CEO of Orbital Marine Power Andrew Scott, the turbine will also supply additional power to generate ‘green hydrogen’ through the use of a land-based electrolyser in the hopes it will demonstrate the “decarbonisation of wider energy requirements.” 

“Our vision is that this project is the trigger to the harnessing of tidal stream resources around the world to play a role in tackling climate change whilst creating a new, low-carbon industrial sector,” says Scott in a statement. 

The Scottish Government has awarded £3.4 million through the Saltire Tidal Energy Challenge Fund to support the project’s construction, while public lenders also contributed to the financial requirements of the tidal turbine through the ethical investment platform Abundance Investment.

“The deployment of Orbital Marine Power’s O2, the world’s most powerful tidal turbine, is a proud moment for Scotland and a significant milestone in our journey to net zero,” says Michael Matheson, the Cabinet Secretary for Net-Zero, Energy and Transport for the Scottish Government. 

“With our abundant natural resources, expertise and ambition, Scotland is ideally placed to harness the enormous global market for marine energy whilst helping deliver a net-zero economy.

“That’s why the Scottish Government has consistently supported the marine energy sector for over 10 years.”

However, Orbital Marine CEO Scott believes there’s potential to commercialise the technology being used in the project with the prospect of working towards more efficient and advanced marine energy projects in the future. 

We believe pioneering our vision in the UK can deliver on a broad spectrum of political initiatives across net-zero, levelling up and building back better at the same time as demonstrating global leadership in the area of low carbon innovation that is essential to creating a more sustainable future for the generations to come.” 

The UK’s growing marine energy endeavours

This latest tidal turbine project isn’t a first for marine energy in the UK. The Port of London Authority permitted the River Thames to become a temporary home for trials into tidal energy technology and, more recently, a research project spanning the course of a year is set to focus on the potential tidal, wave, and floating wind technology holds for the future efficiency of renewable energy. The research is due to take place off of the Southwest coast of England on the Isles of Scilly

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