A Scalable Control Design for Grid-Forming Inverters in Microgrids

Watson, Jeremy D.; Ojo, Yemi; Laib, Khaled; Lestas, Ioannis

doi:10.1109/tsg.2021.3105730

Cited by 19 publications

(19 citation statements)

References 24 publications

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“…By exploiting the passivity property of the lines when these are represented in DQ coordinates it can be shown that Assumption 2.1 is a sufficient decentralized condition for stability, as stated in Theorem 2.2 (see e.g. [9] where a more advanced line model is also used).…”

Section: Passivitymentioning

confidence: 99%

“…Other alternatives based on numerical optimization exist, e.g. the linear matrix inequalities (LMIs) based full-state feedback policies [8], [9], which are single loop schemes, and implemented together with non-droop techniques. [8].…”

Section: Introductionmentioning

confidence: 99%

“…Another approach is passivity based techniques, which allow a decentralized control design with scalability guarantees as in e.g. [9], [3].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to single loop strategies e.g. state feedback schemes [8], [9] and more conventional approaches as in [1], [7], our scheme has a double loop structure that uses the DC voltage in the feedback policy to eliminate power imbalance, thereby providing current limiting capabilities and improving DC voltage regulation. Also, we propose a frequency control scheme that exploits the angle dynamics to provide an improved angle droop policy which allows appropriate passivity properties.…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, secondary control schemes in the literature usually assume lossless lines to prove stability, e.g. [10], or require an OPF to be solved [8], [9]. Our main contributions are summarized as follows:…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A decentralized frequency and voltage control scheme for grid-forming inverters

Ojo

Watson

Laib

et al. 2021

2021 IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe)

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Grid-forming inverters-based autonomous microgrids present new operational challenges as the stabilizing rotational inertia of synchronous machines is absent. We propose in the paper a control architecture for frequency and voltage control with good scalability properties. At slower timescales it allows to incorporate a distributed secondary control policy for which we provide a stability result with line conductances taken into account. At faster timescale this control architecture satisfies a passivity property for a wide range of parameters. The distinctive feature of the voltage control scheme is that it has a double loop structure that uses the DC voltage in the feedback control policy to improve performance. The frequency control policy employs the inverter output current and angle to provide an improved angle droop policy. The performance of the control schemes is illustrated via advanced simulations.

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Section: Passivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Another approach is passivity based techniques, which allow a decentralized control design with scalability guarantees as in e.g. [9], [3].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A decentralized frequency and voltage control scheme for grid-forming inverters

Ojo

Watson

Laib

et al. 2021

2021 IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe)

Self Cite

View full text Add to dashboard Cite

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Grid Forming Converter Control System Synthesis: A Static Output Feedback Approach

Rehimi,

Bevrani,

Urabe

et al. 2024

IEEJ Transactions Elec Engng

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This paper proposes an effective control synthesis strategy to stabilize grid forming converters in the presence of disturbances. The conventional control system for a grid forming converter is based on paralleled and cascaded proportional‐integral (PI) controllers, which are widely used in the industry due to their simplicity and reliability. However, the sequential adjustment of PI gains in different control loops, without consideration of dynamic interconnections limits their performance and capability. To address this limitation, the present paper introduces a control design method based on static output feedback theory. The proposed control scheme reduces the dynamic control design problem to an effective gain scheduling problem. In the proposed methodology, without removing the existing practical control structure, its dynamic parts are moved to the open‐loop system, and simultaneous scheduling of all remaining control gains is achieved during one control design process. MATLAB simulations were conducted to evaluate the performance of the designed control system, and compare it with the conventional control one in terms of step response characteristics. The results demonstrate the superiority of the proposed controller, ensuring system stability and exhibiting improved performance. The proposed control framework provides several advantages, including keeping stability in various disturbance conditions, simultaneous tuning of all control parameters, and no need to change the existing simple control structure. © 2024 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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