dShed - Smart Load Shedding Orchestrator for DERM of DERMS

Net-zero carbon emissions goals are rapidly organising every energy requirement around renewable energy sources that produce electricity. There is a push for rapid electrification of the economy to meet this demand. Dynamic Energy Resource Management Systems (DERMs) are going to operate in a federated structure to build a DERM of DERMs, and dock with the distribution management system (DMS) of the Distribution System Operators (DSO). The ability to monitor the network using real time data for protection and control purposes will be prime. This paper focuses on laying the groundwork for it. A Phasor Measurement Unit (PMU) is a device for estimating the phase angle and magnitude of an electrical phasor quantity in the electricity grid using a common time source for synchronisation. Real-time streaming, however, has not been attempted and applications of PMU data in under-frequency load shedding (UFLS) events have been scarce. This paper focuses on ‘dShed’ - our cloud and distributed streaming application while proposing a rate of change of frequency (ROCOF) method to shed load smartly during a UFLS event. Following the implementation of this method, a case study involving the 2011 UFLS event caused by the loss of generation at the Huntly (NZ) Power Station is used to test the method. A comparison between the existing load shedding scheme and the new proposed scheme has identified a 10% reduction in the amount of load to be shed.