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access icon free Modelling the operation strategies of storages and hydro resources in adequacy analysis of power systems in presence of wind farms

© The Institution of Engineering and Technology
Received 13/10/2015, Accepted 13/03/2016, Revised 22/02/2016, Published 26/04/2016

This study addresses the adequacy of a generating system considering the impact of operation strategies of storages and hydro energy resources. It is assumed that the installed storage capacity of a system can be assigned for two purposes: first, economical operation which adopts storage to shift electric energy and smooth the load curve; and the second, reliability-based operation, which deploys storage to avoid load curtailments. The economical operation strategy is represented by starting from time domain data and using the load curve modification method to synthesise the overall impact of storage. The reliability-based operation is modelled with a new method based on Markov chain model that considers the dynamic behaviour of storage during time. Moreover, a novel state reduction method is presented for decreasing the number of Markov states in applications to large systems. The effectiveness of the presented methods is evaluated by running several simulation scenarios with results presented on three test systems. The results demonstrate that evaluating the system reliability in the presence of energy storage by considering the frequency and duration of system states is more effective than using methods based on the Capacity Outage Probability Table (COPT).

Inspec keywords: hydroelectric power; power generation reliability; wind power plants; time-domain analysis; Markov processes

Other keywords: load curve modification; electric energy; COPT; power systems; reliability-based operation; economical operation; installed storage capacity; storages resources; state reduction; time domain data; adequacy analysis; wind farms; capacity outage probability table; energy storage; Markov states; Markov chain; hydro energy resources

Subjects: Wind energy; Mathematical analysis; Reliability; Wind power plants; Hydroelectric power stations and plants; Probability theory, stochastic processes, and statistics; Markov processes

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