An overview on safe operation of grid-connected converters from resilience perspective: Analysis and design

Abstract

High power grid-connected converters exposed to disturbances such as grid faults and cyber-attacks may pose enormous threat to the safety of the power system. This predicament has led to a growing interest in analyzing the safe operation issues of GCCs. To further comprehend the operation issues and the corresponding analysis methods of grid-connected converters, this paper presents a thorough review of developed methods that describe the operation constraints and design the advanced controller from resilience perspective. From the paper, it can be known that the safe operation of grid-connected converters is restricted by the stability of the synchronization control, the current/power/voltage control and the fragility of electronic devices. Fully considering all the operating constraints, the current limiting strategies based on multi-timescale operation region is given to obtain a resilient converter. Finally, future resilient operation challenges are discussed.© 2017 Elsevier Inc. All rights reserved.