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The Sticky Problem of Inertia

Tom Edwards Senior Consultant

National Grid’s System Operability Framework, published last November, highlighted an increasingly important trend for how we manage the electricity network. It showed system inertia had fallen to 135GVA.s on 7 August 2016, only slightly above the current system minimum of 130GVA.s. System inertia is a measure of the resistance of the electricity network to changes in frequency. It characterises the amount of energy available in the rotating masses of all the machines directly coupled to the network to instantly balance any changes in power demand or supply. Inertia is important to National Grid as it determines the Rate ...

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