Abstract
In the event of a mismatch between generation and demand on an ac electricity system, the frequency will change. The electricity system inertia determines the rate of change of frequency for a given active power mismatch. Increasing penetration of inverter connected renewable generation has resulted in a reduction in conventional synchronous machines connected to the network and therefore a reduction in inertia, particularly at times of high wind / solar generation and low demand. The Rotating Stabiliser is a synchronous machine designed to have a high inertia to replace that which was previously provided by coal and gas fuelled power stations to facilitate further increases in renewable generation. This paper sets out the design of a 500 MWs, 65 MVA synchronous machine, then describes a project to design, build, install and operate two such units at Keith in Scotland, and concludes with practical results from the project.
Published Version
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