Start-Up and Shut-Down Control Strategies for MMC-Based Multi-Terminal HVDC Systems
Publication: Journal of Energy Engineering
Volume 142, Issue 3
Abstract
This paper presents start-up and a shut-down control strategies for modular multilevel converter (MMC) based multiterminal high-voltage direct-current (HVDC) systems (MMC-MTDC). An AC system charging method with voltage slop control and a DC line charging method with sequentially unblock control are firstly discussed. Based on the above two charging methods and considering the strength of the connected AC systems, a start-up control scheme suitable for MMC-MTDC systems is described. The scheduled shut-down control strategy is divided into three stages: in energy feedback stage, four methods including increasing modulation index, adjusting transformer tap, introducing third harmonic voltage injection and inserting redundant submodules (SMs) are presented; and the second stage is energy dissipation stage, in which the SM capacitor voltage is discharged to its lower limit; The SM capacitors are fully discharged by SM internal resistor in the third stage. Finally, a simulation model of five-terminal MMC-HVDC is realized in PSCAD/EMTDC. The results show that the system can be start-up smoothly as well as be shut-down rapidly and reliably, which verifies the feasibility of the proposed control strategies.
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Acknowledgments
This paper was supported by the Headquarters Research Projects of State Grid Corporation of China (SGCC-HRP031-2015).
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Published In
Journal of Energy Engineering
Volume 142 • Issue 3 • September 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 13, 2014
Accepted: Jul 15, 2015
Published online: Sep 17, 2015
Discussion open until: Feb 17, 2016
Published in print: Sep 1, 2016
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