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access icon openaccess Influence of solid oxide fuel cell on power system transient stability

This is an open access article published by the IET under the Creative Commons Attribution -NonCommercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Received 23/08/2018, Accepted 19/09/2018, Published 23/10/2018

Due to its modular, efficient and non-polluting characteristics, solid oxide fuel cell (SOFC) is promising to be widely utilised in the area of distributed generation. Previous studies mainly focused on dynamic modelling of SOFC to analyse its load following behaviour, however, the influence of SOFC on power system transient stability is not yet clear and needs further discussion. In this study, a system-level electromechanical transient mathematical model for SOFC is proposed, based on the circuit structure of SOFC, DC/DC step-up converter and DC/AC converter. Then, a double closed-loop control scheme is designed for the control of SOFC. Finally, the effect of SOFC on the power system's transient stability is discussed through simulations based on IEEE 3-machine 9-bus standard system. Results show that, under real and reactive power coordinated control strategy, cell current can be adjusted. Therefore, the output power of SOFC can be modulated to help with voltage recovery and power angle stability. The authors’ work reveals the feasibility of using SOFC to enhance power system transient stability.

Inspec keywords: power system transient stability; solid oxide fuel cells; power system control; closed loop systems; distributed power generation; power system faults; power system simulation; DC-AC power convertors; power grids; power generation control; control system synthesis; voltage control; power system stability; power system interconnection; reactive power control; DC-DC power convertors

Other keywords: IEEE 3-machine 9-bus standard system; DC/DC step-up converter; voltage recovery; SOFC; solid oxide fuel cell; reactive power coordinated control strategy; power system transient stability; system-level electromechanical transient mathematical model; double closed-loop control; power angle stability

Subjects: Control system analysis and synthesis methods; Distributed power generation; Power system control; Control of electric power systems; Stability in control theory; Power convertors and power supplies to apparatus; Power system management, operation and economics

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