ECN publication
CRISP - Deliverable 1.5: Intelligent Load Shedding
Gajic, Z.; Karlsson, D.; Andrieu, C.; Carlsson, P; Ullah, N.R.; Okuboye, S.
Published by: Publication date:
ECN Energy in the Built Environment 14-9-2007
ECN report number: Document type:
ECN-O--07-012 Other
Number of pages: Full text:
131 Download PDF  

Load shedding has been used to mitigate the consequences of large disturbances in electric power systems, since the beginning of the electrification era. The way to execute the load shedding, i.e. open a circuit breaker, has hardly developed at all for a 100-year period. The modern society dependence on reliable electricity supply is continuously increasing. This means that the consequences of traditional load shedding are not acceptable. In the meantime computer and communication technology has developed tremendously. There is also a trend to use more and more intelligent control and less hardware, such as lines and generators, to provide the required level of reliability for the electric supply. Especially in power systems, and parts of power systems, comprising distributed generation, there seems to be a great potential to improve the overall cost/benefit-ratio for the desired level of reliability, by the use of intelligent “load shedding”. “Intelligent load shedding" is a means to improve power system stability, by providing an adapted load control along the distribution network, in situations where the power system otherwise would go unstable. The work with intelligent load shedding in this work package results in various technical principles of dedicated algorithms. These algorithms intend to bring a support tool for the operating system during critical situations. The main aspects are evaluating the right amount and location of power response for a given disturbance, and evaluating the right time response expected in order to comply with an acceptable stability recover. This time response is a main object in order to define appropriate ICT network enabling such a reliable implementation. A main problem of the intelligent load shedding is how to choose load to shed conveniently and quickly. There is a technical problem of finding the right level and location of the load to shed, and also an economical problem of giving incentives in order to have enough remote controlled loads. Some aspects on a dedicated market system are reported in the document in order to start to express some ICT system expectations and requirements. Another aspect is the required coordination of the responses of local production and local controlled loads, in order to combine adequately the efforts to support the system.

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