Grid-Forming Hybrid Angle Control and Almost Global Stability of the DC-AC Power Converter

Tayyebi, Ali; Anta, Adolfo; Dörfler, Florian

doi:10.1109/tac.2022.3193953

Cited by 14 publications

(5 citation statements)

References 54 publications

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“…The proposed controller's performance is evaluated under different load disturbances and compared to controllers tuned by other optimization algorithms, demonstrating its effectiveness in various scenarios. In [23], the researchers present a grid-forming control method called hybrid angle control (HAC) for grid-connected dc-ac power converters. This control strategy combines dc-based matching control with nonlinear angle feedback, drawing inspiration from droop control and direct angle control.…”

Section: Literature Reviewmentioning

confidence: 99%

Comparative Analysis of Various Controllers used for Automatic Generation Control in Electrical Power Systems

2023

IJFMR

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In the rapidly evolving landscape of power systems, achieving a stable and efficient Automatic Generation Control (AGC) remains paramount. The exigency for this research stems from the critical role AGC plays in maintaining frequency and power balance amidst dynamic system changes. The consequences of inadequacies in AGC manifest as frequency deviations, system instabilities, and potential blackouts, with widespread socio-economic implications for different use cases. Historically, various controllers have been proposed and implemented to address AGC challenges. However, existing methodologies have displayed inherent limitations. Predominant issues include lack of adaptability to non-linearities, slow response times, inability to cater to the multifaceted nature of modern power grids with renewable integrations, and susceptibility to uncertainties and disturbances. This comprehensive review delves deep into the spectrum of controllers available for AGC, encompassing conventional PI/PID controllers, robust controllers, adaptive controllers, intelligent controllers, and the more recent forays into neural network-based and fuzzy logic controllers. Each controller's salient features, operational dynamics, advantages, and shortcomings are meticulously dissected. Furthermore, this paper elucidates the contexts in which each controller type excels or is found wanting, providing invaluable guidance for system designers and operators. In essence, this review serves as a holistic compass for stakeholders involved in power system operation and design. It offers both a retrospective understanding and prospective insights, assisting decision-makers in choosing the most suitable controller for a given scenario. Whether one aims to optimize AGC for a traditional grid, a grid with high renewable penetration, or a hybrid system, this paper promises to be an indispensable reference for researchers.

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Section: Literature Reviewmentioning

confidence: 99%

Comparative Analysis of Various Controllers used for Automatic Generation Control in Electrical Power Systems

2023

IJFMR

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“…As for the power controls, several strategies have been proposed, e.g., droop control [4], [5], virtual synchronous generator (VSG) control [6], [7], virtual oscillator control [8], matching control [9], power synchronization control [10], [11], hybrid angle control [12], etc. Until now, the characteristics of these grid-forming controls have been studied from different aspects.…”

Section: Introductionmentioning

confidence: 99%

On Power Control of Grid-Forming Converters: Modeling, Controllability, and Full-State Feedback Design

Chen

Zhou

Tayyebi

et al. 2024

IEEE Trans. Sustain. Energy

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The popular single-input single-output control structures and classic design methods (e.g., root locus analysis) for the power control of grid-forming converters have limitations in applying to different line characteristics and providing favorable performance. This paper studies the grid-forming converter power loops from the perspective of multi-input multi-output systems. First, the error dynamics associated with power control loops (error-based state-space model) are derived while taking into account the natural dynamical coupling terms of the power converter models. Thereafter, the controllability Gramian of the grid-forming converter power loops is studied. Last, a full-state feedback control design using only the local measurements is applied. By this way, the eigenvalues of the system can be arbitrarily placed in the timescale of power loops based on predefined timedomain specifications. A step-by-step construction and design procedure of the power control of grid-forming converters is also given. The analysis and proposed method are verified by experimental results and system-level simulation comparisons in Matlab/Simulink.

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“…In recent years, advanced GFM controls have been widely explored, e.g., dispatchable virtual oscillator control (dVOC) [16]- [21], matching control [22], hybrid angle control [23], and dual-port GFM control [24], as shown in Table I(b). These controls are well-designed to address various control objectives and ensure stability, particularly global stability.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Stability of Complex Droop Control in Converter-Based Power Systems

Verena

Subotić

et al. 2023

IEEE Control Syst. Lett.

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In this paper, we study analytically the transient stability of grid-connected distributed generation systems with gridforming (GFM) complex droop control, also known as dispatchable virtual oscillator control (dVOC). We prove theoretically that complex droop control, as a state-of-the-art GFM control, always possesses steady-state equilibria whereas classical p/f and q/v droop control does not. We provide quantitative conditions for complex droop control maintaining transient stability (global asymptotic stability) under grid disturbances, which is beyond the well-established local (non-global) stability for classical droop control. For the transient instability of complex droop control, we reveal that the unstable trajectories are bounded, manifesting as limit cycle oscillations. Moreover, we extend our stability results from second-order GFM control dynamics to full-order system dynamics that additionally encompass both circuit electromagnetic transients and inner-loop dynamics. Our theoretical results contribute an insightful understanding of the transient stability and instability of complex droop control and offer practical guidelines for parameter tuning and stability guarantees.

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Grid-Forming Hybrid Angle Control and Almost Global Stability of the DC-AC Power Converter

Cited by 14 publications

References 54 publications

Comparative Analysis of Various Controllers used for Automatic Generation Control in Electrical Power Systems

Comparative Analysis of Various Controllers used for Automatic Generation Control in Electrical Power Systems

On Power Control of Grid-Forming Converters: Modeling, Controllability, and Full-State Feedback Design

Nonlinear Stability of Complex Droop Control in Converter-Based Power Systems

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