4.1 General
As we have seen, integrating more large-capacity
RE into the grid brings variability and uncertainty.In addition to adding new flexibility,
existing flexibility can be better exploited by
operational enhancement within a balancing area,
and can be shared in wider geographic footprints
by cooperation between, or consolidation of,
smaller balancing areas, supported by transmission
expansion.The new solutions will include new
technologies, methods and practices, applied in
order to provide more flexibility and improve the
efficiency of power systems, constantly balancing
generation and load.This means mitigating the impacts of RE generation
on the power system, enabling it to contribute
to system reliability and stability by improving its
design and control technologies.At the same time, there will continue to be
unexpected disturbances stemming from load
variation, grid faults and conventional generation
outages.Worldwide studies and experience
in recent years have shown that new technical
solutions are needed to address this conjunction
of difficulties.Flexibility from conventional
generation is currently the major source of power
system flexibility and is generally referred to as
"generation flexibility".The required power system flexibility can be
achieved on the generation side, from both RE
generation and conventional generation.