a large-scale blackout occurred in the Spanish power grid
affecting Spain
Portugal
and southern France
with over 50 million people impacted. The direct cause of the incident was forced oscillations in photovoltaic power plants
which triggered a chain of overvoltage-induced disconnections of renewable energy units
ultimately leading to system collapse. In-depth analysis reveals that this accident exposed multiple underlying risks in power systems with a high proportion of renewable energy:first
insufficient reactive power compensation capacity in the grid
making it impossible to balance redundant reactive power locally; second
weak interconnection between Spain and the main European grid
preventing effective support during the incident; and third
a severe lag in the construction of flexible regulation resources and a mismatch with inertia
making it difficult to compensate for power deficits. Based on a review of the accident process and causes
and considering the current state of China's new-type power system construction
this paper summarizes profound lessons for the secure development of China's power grid
including optimizing planning approaches
constructing robust grid structures
configuring adequate reactive power
improving grid-connection standards
and enhancing flexible resources.
关键词
Keywords
references
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