Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Study of and methods for intelligent load shedding

Comprehensive information is provided on traditional load shedding based on voltage frequency criterion or on voltage magnitude criterion. Thorough information about large power oscillations is presented to underline the complexity of setting proper solutions for reaching a right level of stability in the system. Load shedding is a defence scheme used worldwide and its ideal objective during critical situation is to recover quickly the global balance between production and demand, with dynamical characteristics enabling a correct come back to stable steady-state.

The result shows the need for a fundamental change in the associated distribution automation. The terminology used asks for some questions since the local intelligence leads rather to a distributed controlled system, the control being achieved on DG units and on controlled loads.

The document takes into account three concepts of technical solution in order to deal with the stability of the system, which is the traditional goal of the existing load shedding: SLR (smooth load relief), CPA (critical preventing action) and DLS (distributed load shedding). Once market-based multi-agent systems are implemented for Supply-Demand matching, market-based approaches for ILS could have a great value, although there should always be a fall-back strategy in terms of immediate manual action.

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Reported by

ABB Automation Technologies AB
ABB Automation Technologies AB
721 59 Västerås