Abstract
As power systems transit to a state of high renewable penetration, little or no presence of synchronous generators makes the prerequisite of well-regulated frequency for grid-following inverters unrealistic. Thus, there is a trend to resort to grid-forming inverters which set frequency directly. We propose a novel grid-forming frequency shaping control that is able to shape the aggregate system frequency dynamics into a first-order one with the desired steady-state frequency deviation and Rate of Change of Frequency (RoCoF) after a sudden power imbalance. The no overshoot property resulting from the first-order dynamics allows the system frequency to monotonically move towards its new steady-state without experiencing frequency Nadir, which largely improves frequency security. We prove that our grid-forming frequency-shaping control renders the system internally stable under mild assumptions. The performance of the proposed control is verified via numerical simulations on a modified Icelandic Power Network test case.
Original language | American English |
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Article number | 9292997 |
Pages (from-to) | 1988-1993 |
Number of pages | 6 |
Journal | IEEE Control Systems Letters |
Volume | 5 |
Issue number | 6 |
DOIs | |
State | Published - 2021 |
Bibliographical note
Publisher Copyright:© 2017 IEEE.
NREL Publication Number
- NREL/JA-5D00-79026
Keywords
- Control of networks
- power systems