Fault resilient multi-terminal high voltage direct current systems using distributed corrective power dispatch

• Published in: IET generation, transmission & distribution Vol. 13; no. 19; pp. 4391 - 4399
• Main Authors: Mojallal, Aslan, Lotfifard, Saeed, Azimi, Seyed Mohammad
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 08.10.2019
• Subjects: CIGRE B4 MTDC test system; constant power converters; constant power voltage source converters; corrective power dispatch; different system operators; distributed architecture; distributed power generation; distributed scheme; distributed secondary layer control scheme; fault resilient multiterminal high voltage direct current systems; HVDC power convertors; HVDC power transmission; intended operating mode; load flow control; MTDC systems; multiobjective optimisation problem; multiterminal high voltage direct current transmission systems; optimisation; over‐voltages; power commitment; power convertors; power generation control; power grids; power losses; power system stability; power transmission control; Research Article; secondary controller; secondary level control; voltage control; HVDC power convertors; multiobjective optimisation problem; secondary controller; power generation control; distributed scheme; distributed secondary layer control scheme; distributed power generation; over-voltages; distributed architecture; HVDC power transmission; MTDC systems; optimisation; secondary level control; power grids; CIGRE B4 MTDC test system; multiterminal high voltage direct current transmission systems; power system stability; power convertors; intended operating mode; power transmission control; constant power converters; load flow control; different system operators; corrective power dispatch; constant power voltage source converters; power losses; fault resilient multiterminal high voltage direct current systems; power commitment; voltage control
• ISSN: 1751-8687; 1751-8695; 1751-8695
• DOI: 10.1049/iet-gtd.2018.7010

A distributed secondary layer control scheme for multi-terminal high voltage direct current (MTDC) transmission systems is proposed. The proposed control scheme is achieved via solving a multi-objective optimization problem. The objectives are defined such that: (i) the power losses of the system are minimized and (ii) the resiliency of the system in facing large disturbances and faults is enhanced. The second objective prevents the constant power converters to change their intended operating mode to avoid over-voltages. Hence, the proposed scheme enhances the power commitment of such buses despite the occurrence of faults and large disturbances in the system. The proposed secondary controller is implemented in a distributed architecture using optimality condition decomposition. By employing the distributed scheme, the computational burden of the secondary level control is decreased and the autonomy of each zone in the MTDC grid is increased. The CIGRE B4 MTDC test system is employed to demonstrate the effectiveness of the proposed method. PSCAD and MATLAB are used to perform the simulations for the case studies. The simulation results verify that the proposed method enhances the resiliency of the MTDC systems by avoiding undesirable change of operations mode of constant power converters while decreasing losses of the system.