Supplementary Controller for Inverter-Based Resources in Weak Power Grids

This paper proposes a supplementary controller to damp out the power and frequency oscillations of inverter-based resources (IBRs) connected to weak power grids. The proposed supplementary controller is integrated into the commonly used Proportional Integral (PI) controllers in the synchronous refer...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2022-07, Vol.13 (4), p.2886-2896
Main Authors: Azimi, Seyed Mohammad, Lotfifard, Saeed
Format: Article
Language:English
Subjects:
Aerospace electronics
Control systems design
Controllers
Damping
Frequency control
Inverters
Oscillators
passivity based control
Phase locked loops
Power grids
Power system dynamics
Power system stability
Proportional integral
Supplementary control
Transient response
weak power grids
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Summary:This paper proposes a supplementary controller to damp out the power and frequency oscillations of inverter-based resources (IBRs) connected to weak power grids. The proposed supplementary controller is integrated into the commonly used Proportional Integral (PI) controllers in the synchronous reference frame (SRF). It does not change the conventional basic control loops and only injects two additional control commands to the basic controller loops of IBRs to improve the transient response of the controllers without affecting their regulation performances. The dynamic of phase locked loop (PLL) is considered in the design of the proposed controller, which enables the proposed supplementary controller to have an effective performance in weak power grids. The proposed supplementary controller is designed based on the interconnection damping assignment passivity based (IDA-PB) control strategy with the capability of injecting damping to both relative-degree-one (RD1) and higher-relative-degree (HRD) states of IBRs. The effectiveness of the proposed supplementary controller is verified using a set of time-domain simulations on a sample multisource weak power grid.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2022.3159721