Dynamic Line Rating — Pushing The Grid To Its Max In Denmark
It’s getting windy in the small country of Denmark. Or rather, massive amounts of electricity from wind will come from the shallow waters around the country and hit the shores for the country to use, and to sell to the rest of Europe.
It could potentially be up to 14 GW if the companies that buy into the task utilize the full capacity. And this is on top of the 2.4 GW already in service. So we are looking at a nameplate capacity of +16 GW in a country that consumes 6 GW at peak load. Denmark has 2.8 million households, and this new capacity could provide enough energy for +16 million households total.
What I stumbled on when learning about this expansion in offshore wind was a suggested solution to, in part, solve the capacity bottleneck of the grid. It’s called, and it’s one of those things almost nobody has heard about, but it’s of the utmost importance considering the super abundant renewable energy flow of the future.It’s worth repeating the name of this concept a few times, because it’s actually very clever.
“Instead of a fixed safety margin and a very conservative limit for how much current we can allow to be sent through the overhead lines, it is now possible to move the limit up and down, depending on what the weather conditions are like at that particular hour. Thereby, we can make better use of the existing electricity grid — we can go closer to the limit, because we can calculate exactly where the limit is in real time.
It has been necessary to develop a completely new advanced system with a new algorithm and, for a period, obtain measurement data on selected overhead lines for verification of the algorithm to enable Dynamic Line Rating. The real innovation, however, is that the concept is meant to be solely based on weather forecasts and a mathematical representation of cooling conditions for a given overhead line.
The Dynamic Line Rating solution has by now been implemented on about 20 of the country’s total of 90 overhead lines, and is expected to be fully implemented at the beginning of 2024. Initial calculations show that there is an economic gain of approximately DKK 400 million by 2030, based on the ability to transport electricity in regions more efficiently.
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