Power Sharing in Angle Droop Controlled Microgrids

Kolluri, Ramachandra Rao; Mareels, Iven; Alpcan, Tansu; Brazil, Marcus; Hoog, Julian de; Thomas, Doreen A.

doi:10.1109/tpwrs.2017.2672569

Cited by 56 publications

(50 citation statements)

References 23 publications

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“…The work by [30] provides an steady-state analysis of several distributed secondary frequency control strategies with consideration to clock drifts, illustrated with simulation results. In [31], and focusing in angle droop control, stabilizing controllers based in consensus are derived to remove the negative effects that drifts have on frequency control and power sharing. Simulation results are also used to corroborate the control proposal.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Clock Drifts on Frequency Regulation and Power Sharing in Inverter-Based Islanded Microgrids

Martí

Torres-Martínez

Rosero

et al. 2018

IEEE Trans. Power Electron.

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Local hardware clocks in physically distributed computation devices hardly ever agree because clocks drift apart and the drift can be different for each device. This paper analyses the effect that local clock drifts have in the parallel operation of voltage source inverters (VSIs) in islanded microgrids (MG). The state-of-the-art control policies for frequency regulation and active power sharing in VSIs-based MGs are reviewed and selected prototype policies are then re-formulated in terms of clock drifts. Next, steady-state properties for these policies are analyzed. For each of the policies, analytical expressions are developed to provide an exact quantification of the impact that drifts have on frequency and active power equilibrium points. In addition, a closed-loop model that accommodates all the policies is derived, and the stability of the equilibrium points is characterized in terms of the clock drifts. Finally, the implementation of the analyzed policies in a laboratory MG provides experimental results that confirm the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Clock Drifts on Frequency Regulation and Power Sharing in Inverter-Based Islanded Microgrids

Martí

Torres-Martínez

Rosero

et al. 2018

IEEE Trans. Power Electron.

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“…Adding such an additional control layer would increase the overall complexity of the hierarchical MG control architecture [4]. In [20], an angle droop control, with consensus based frequency and power control to ensure PS in the presence of clock drifts is proposed. Yet, the implementation of [20] requires complete knowledge of phase angles, which is often a restrictive assumption in practice.…”

Section: Introductionmentioning

confidence: 99%

“…In [20], an angle droop control, with consensus based frequency and power control to ensure PS in the presence of clock drifts is proposed. Yet, the implementation of [20] requires complete knowledge of phase angles, which is often a restrictive assumption in practice. Furthermore, in the related works [14]- [17] neither conditions for stability nor conditions under which a given distributed frequency control scheme leads to accurate PS in the presence of clock drifts are provided.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we extend the work in [1] by providing a design criterion in the form of a set of linear matrix inequalities (LMIs) which ensures that the GDAI control renders asymptotic stability (AS) of the closed-loop equilibrium point in the presence of clock drifts and guarantees accurate frequency restoration and PS. Unlike in [20], we do not linearize the electrical network, instead we work with the non-linear MG model. Moreover, our design criterion does not require knowledge of the operating point.…”

Section: Introductionmentioning

confidence: 99%

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A Consensus-Based Control Law for Accurate Frequency Restoration and Power Sharing in Microgrids in the Presence of Clock Drifts

Krishna

Schiffer

Raisch

2018

2018 European Control Conference (ECC)

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Clock drifts are a common phenomenon in distributed systems, such as microgrids (MGs). Unfortunately, if not accounted for, the presence of clock drifts can hamper accurate frequency restoration and power sharing in MGs. As a consequence, we have proposed in [1] a distributed secondary frequency control that ensures an accurate stationary control performance in the presence of clock drifts. In the present work, we extend the analysis in [1] by providing a tuning criterion for the controller parameters that guarantees robust stability of a given equilibrium point of the closed-loop dynamics with respect to uncertain bounded clock drifts. Finally, our analysis is validated via simulation.

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“…M ICROGRID is a paradigm shifting solution which enhances electricity resiliency and supports the ever-increasing integration of distributed energy resources (DERs) and energy storage at grid edges [1], [2]. However, it is oftentimes prohibitively difficult to build and operate a microgrid mainly due to the hardware-dependence of microgrid protection, automation and control (PAC) where the microgrid intelligence resides.…”

Section: Introductionmentioning

confidence: 99%

Software-Defined Microgrid Control: The Genesis of Decoupled Cyber-Physical Microgrids

Wang

Qin

Tang

et al. 2020

IEEE Open J. Power Energy

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Nowadays, microgrid controllers are often embedded in specialized hardware such as PLC and DSP. The hardware-dependency and fit-and-forget design make it difficult and costly for microgrid controllers to evolve and upgrade under frequent changes such as plug-and-play of microgrid components. Furthermore, different distributed energy resources in a microgrid require customized controllers, leading to long development cycles and high operational costs for deploying microgrid services. To tackle the challenges, a software-defined control SDC) architecture for microgrid is devised, which virtualizes traditionally hardware-dependent microgrid control functions as software services decoupled from the underlying hardware infrastructure, fully resolving hardware dependence issues and enabling unprecedentedly low costs. A generic SDC prototype is designed to generate microgrid controllers autonomously in edge computing facilities such as distributed virtual machines. Extensive experiments verify that SDC outperforms traditional hardware-based microgrid control in that it empowers a decoupled cyber-physical microgrid and thus makes microgrid operations unprecedentedly affordable, autonomic, and secure.

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Power Sharing in Angle Droop Controlled Microgrids

Cited by 56 publications

References 23 publications

Analysis of the Effect of Clock Drifts on Frequency Regulation and Power Sharing in Inverter-Based Islanded Microgrids

Analysis of the Effect of Clock Drifts on Frequency Regulation and Power Sharing in Inverter-Based Islanded Microgrids

A Consensus-Based Control Law for Accurate Frequency Restoration and Power Sharing in Microgrids in the Presence of Clock Drifts

Software-Defined Microgrid Control: The Genesis of Decoupled Cyber-Physical Microgrids

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