Roger Wiget

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This paper presents a variety of different Security Constrained Optimal Power Flow formulations addressing four power system operation and planning problems: (a) forecast uncertainty of Renewable Energy Sources (RES) in-feed and load, (b) security criteria based on contingency risk, (c) corrective control offered through High Voltage Direct Current (HVDC)(More)
—In this paper, an optimal power flow for combined AC and DC grids is proposed. Several suggested projects to increase the transmission capacity are based on multi-terminal HVDC grids (MTDC). The construction of MTDC leads to major changes in the power flow of the existing grids. The problem description given in this paper considers the main points for(More)
Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Abstract—Many(More)
—This paper presents a decentralized controller for sharing primary AC frequency control reserves through a multi-terminal HVDC grid. By using passivity arguments, the proposed controller is shown to stabilize the equilibrium of the closed-loop system consisting of the interconnected AC and HVDC grids, given any positive controller gains. The static control(More)
Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Abstract—This(More)
—In this paper, we present distributed controllers for sharing primary and secondary frequency control reserves for asynchronous AC transmission systems, which are connected through a multi-terminal HVDC grid. By using passivity arguments , the equilibria of the closed-loop system are shown to be globally asymptotically stable. We quantify the static errors(More)
Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Abstract—This(More)
Quality of homoeopathic mother tinctures is assured by the definition of the starting material, the manufacturing process and the analytical characteristics described in the monograph. Traditionally analytical characterisation of the mother tincture comprises appearance, odour, identity, density and dry residue. According to annex I of directive 2001/83/EC(More)
  • Michiel Tavernier, Roger Wiget, Michiel Andres Tavernier
  • 2014
Introduction Many existing High Voltage Alternating Current (HVAC) bulk transmission systems, e.g., in Europe and North America, have reached their capability limits and a significant increase of transmission capacity is foreseen within the next decades. There are several reasons calling for an upgrade, where the most significant is the expected overall(More)
Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Abstract—In this(More)
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