Abstract
Future electric power systems will face new operational challenges due to the high penetration of distributed energy resources (DERs). In Denmark, distribution system operator (DSO) expects a significant congestion increased in distribution grids. In order to manage these congestions and mobilize the DERs as economically efficient as possible in the future distribution grid, the brand new notion of flexibility clearing house (FLECH) is proposed in this paper. With the aggregator-based offers, the proposed FLECH market has the ability to promote small scale DERs (upto 5 MW) for actively participating in trading flexibility services, which are stipulated accommodating the various requirements of DSO. Accordingly, the trading setups and processes of the FLECH market are also illustrated in detail. A quantitative example is utilized to illustrate the formulation and classification of flexibility services provided by the DERs in the proposed FLECH market.
Highlights
In the long term perspective, the renewable energy and more efficient energyCrossCheck date: 13 March 2014In Denmark and other European Union (EU) countries, the rapid growth of these intermittent distributed energy resources (DERs) will pose a significant challenge associated with congestion issues in distribution grids
Depending on the existing electricity market structure, there are exclusively several approaches for congestion management specific to transmission system operator (TSO), which could be categorized into three types: (1) The optimal power flow (OPF) based method, which is based on a centralized optimization and is considered to be the most accurate and effective congestion management method
The main congestion management could be classified as follows: 1) Feeder overload management: The high power flow comes over feeder capacity-limit, which can be caused by regular growth in electricity consumption, mobilization of reserve capacity in the grid, activation of regulating power for the TSO, or very low prices of electricity
Summary
In the long term perspective, the renewable energy (wind, photovoltaic, etc.) and more efficient energy. In recent years, aiming to stimulate the small scale DERs into the existing market structure, the real-time market demonstrated with several ongoing smart grid projects subdivides the time scale into 5 min intervals for providing balancing services to TSO, e.g. the EcoGrid EU market complies with a bidless clearing process, the Olympic Peninsula market and the PowerMatcher energy management system employ agents to submit bids to an auction for establishing an equilibrium price [2] These frameworks may not be consistent with the future scenarios: The primary task of TSO is to avoid system-wide imbalance occurring, while the executive issue for DSO is to relieve the congestions in local network.
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