Power systems must be actively managed to maintain a steady balance between supply
and demand. This is already a complex task as demand varies continually. But what
happens when supply becomes more variable and less certain, as with some renewable
sources of electricity like wind and solar PV that fluctuate with the weather? To what
extent can the resources that help power systems cope with the challenge of variability
in demand also be applied to variability of supply? How large are these resources?
And what share of electricity supply from variable renewables can they make possible?
There is no one-size-fits-all answer. The ways electricity is produced, transported and
consumed around the world exhibit great diversity. Grids can cross borders, requiring
co‑ordinated international policy, or can be distinct within a single country or region.
And whether found in dispatchable power plants, storage facilities, interconnections for
trade or on the demand side, the flexible resource that ensures the provision of reliable
power in the face of uncertainty likewise differs enormously.
Written for decision makers, Harnessing Variable Renewables: a Guide to the Balancing
Challenge sheds light on managing power systems with large shares of variable
renewables. It presents a new, step-by-step approach developed by the IEA to assess
the flexibility of power systems, which identifies the already present resources that
could help meet the twin challenges of variability and uncertainty.
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发表于 2011-11-3 18:19:29
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