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http://hdl.handle.net/10397/76087
Title: | Model, characterization, and analysis of steady-state security region in AC/DC power system with a large amount of renewable energy | Authors: | Chen, Z Chen, H Zhuang, MH Bu, SQ |
Issue Date: | 2017 | Source: | Energies, Aug. 2017, v. 10, no. 8, 1181 | Abstract: | A conventional steady-state power flow security check only implements point-by-point assessment, which cannot provide a security margin for system operation. The concept of a steady-state security region is proposed to effectively tackle this problem. Considering that the commissioning of the increasing number of HVDC (High Voltage Direct Current) and the fluctuation of renewable energy have significantly affected the operation and control of a conventional AC system, the definition of the steady-state security region of the AC/DC power system is proposed in this paper based on the AC/DC power flow calculation model including LCC/VSC (Line Commutated Converter/Voltage Sourced Converter)-HVDC transmission and various AC/DC constraints, and hence the application of the security region is extended. In order to ensure that the proposed security region can accurately provide global security information of the power system under the fluctuations of renewable energy, this paper presents four methods (i.e., a screening method of effective boundary surfaces, a fitting method of boundary surfaces, a safety judging method, and a calculation method of distances and corrected distance between the steady-state operating point and the effective boundary surfaces) based on the relation analysis between the steady-state security region geometry and constraints. Also, the physical meaning and probability analysis of the corrected distance are presented. Finally, a case study is demonstrated to test the feasibility of the proposed methods. | Keywords: | Steady-state security region AC/DC constraint Effective boundary surface Operating margin HVDC transmission Renewable energy |
Publisher: | Molecular Diversity Preservation International (MDPI) | Journal: | Energies | ISSN: | 1996-1073 | EISSN: | 1996-1073 | DOI: | 10.3390/en10081181 | Rights: | © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). The following publication Chen, Z.; Chen, H.; Zhuang, M.; Bu, S. Model, Characterization, and Analysis of Steady-State Security Region in AC/DC Power System with a Large Amount of Renewable Energy. Energies 2017, 10, 1181, 1-17 is available at https://dx.doi.org/10.3390/en10081181 |
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