Analysis of linear Phase-Locked Loops in Grid-Connected Power Converters Joachim Steinkohl, Xiongfei Wang, Pooya Davari and Frede Blaabjerg Aalborg University
Abstract
Fast and accurate synchronization capability of grid-connected converters is becoming more and more
important to ensure proper performance during transient events, such as grid faults. The higher requirements during the operation, as Fault-Ride-Through with reactive current injection, cause higher
requirements on the operation during severe system conditions. This paper analyzes an addition to
Synchronous-Reference-Frame Phase-Locked Loops for power electronic converters, that is linearizing
the input signal. This enhances the tracking capabilities during abnormal transient events in the power
grid. The improved control is analyzed and its increased performance is validated through simulations
and experimental results.
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