Model, Characterization, and Analysis of Steady-State Security Region in AC/DC Power System with a Large Amount of Renewable Energy

Zhong Chen, Hui Chen, Minhui Zhuang and Siqi Bu
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Zhong Chen: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Hui Chen: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Minhui Zhuang: Danyang Power Supply Company, Jiangsu Electric Power Company, Danyang 211106, China
Siqi Bu: Department of Electrical Engineering, Hong Kong Polytechnic University, Hong Kong, China

Energies, 2017, vol. 10, issue 8, 1-17

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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