Robust loop-shaping H&lt;inf&gt;&amp;#x221E;&lt;/inf&gt; control of LCL-connected grid converters

Cobreces, Santiago; Bueno, Emilio; Rodríguez, Francisco; Pizarro, Daniel; Huerta, F.

doi:10.1109/isie.2010.5637614

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…We have also defined a base case to illustrate a possible passivity shortage analysis and W pr selection. The frequencydomain results 8 will be correlated with time-domain experimental results. The plant parameters for the four studied cases are summed up in Table II.…”

Section: Resultsmentioning

confidence: 99%

“…However, in practice, the lack of information at each PCC limits its knowledge to a range of possible values in a simplified dynamic model. In that situation, the conventional Robust Control theory [7] gives an approach to this problem relying on the compliance with the Small Gain Theorem using H ∞ control [8]. The basic idea behind that approach is to quantify uncertainty in terms of gain bounds and design a controller to stabilize the system in a worst case scenario that is valid for any other situation.…”

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confidence: 99%

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Low-Order Passivity-Based Robust Current Control Design for Grid-Tied VSCs

Serrano-Delgado

Cobreces

Rizo

et al. 2021

IEEE Trans. Power Electron.

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This paper presents a systematic robust current control design approach for three-phase voltage-source converters. Robustness is guaranteed by combining intrinsic passive properties of the impedance uncertainty at the point of common coupling together with stability results from Passivity-based Control theory. This approach ensures stability against typical uncertainty sources at mid and high-frequencies, such as cable resonances or other converters interaction, with significant less conservative performances than the obtained with traditional Robust Control theory. The approach uses multi-objective controller synthesis formulation that allows to logically combine robustness requirements with performance objectives avoiding heuristic iteration over the control structure and parameters. The controller synthesis is performed by means of a non-smooth H∞ optimization technique that tunes all free parameters of a vector-based controller function, which constraints its structure. This results in a synthesized controller with lower order than those obtained with convex optimization definitions of the H∞ control problem. The design methodology is validated in time and frequency domain by means of theoretical analysis and experimental results with three usual grid filters: L, LCL and LLCL.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Low-Order Passivity-Based Robust Current Control Design for Grid-Tied VSCs

Serrano-Delgado

Cobreces

Rizo

et al. 2021

IEEE Trans. Power Electron.

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“…H ∞ control theory in particular has been used to both analyze power electronics systems [30], synthesize [5] or tune controllers [31], [32] The µ-synthesis [33] approach based on structured singular values (SSV) allows to tune a fixed structure controller through H ∞ methods to achieve a final set of parameters that can minimize the effects of disturbances, such as model uncertainty or external noise on the closed loop performance. The method employed to tune a fixed structure controller to minimize the impact of disturbances is called D-K Iteration, presented in [34].…”

Section: ) Controller Designmentioning

confidence: 99%

A Scalable System Architecture for High-Performance Fault Tolerant Machine Drives

Savi

Barater

Buticchi

et al. 2021

IEEE Open J. Ind. Electron. Soc.

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When targeting mission critical applications, the design of the electronic actuation systems needs to consider many requirements and constraints not typical in standard industrial applications. One of these is tolerance to faults, as the unplanned shutdown of a critical subsystem, if not handled correctly, could lead to financial harm, environmental disaster, or even loss of life. One way this can be avoided is through the design of an electric drive systems based on multi-phase machines that can keep operating, albeit with degraded performance, in a partial configuration under fault conditions. Distributed architectures are uniquely suited to meet these challenges, by providing a large degree of isolation between the various components. This paper presents a system architecture suitable for scalable and high-performance fault tolerant machine drive systems. the effectiveness of this system is demonstrated through theoretical analysis and experimental verification on a six-phase machine.

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“…Many research efforts have exploited the modularity and scalability of impedance shaping approach from viewpoints of active damping, virtual impedance control, to methods for passivating VSCs [18][19][20][21][22][23][24][25][26][27]. More recently, impedance shaping approaches have been fitted to exploit the superiority of existing robust control methods through convex optimization [28][29][30][31][32]. However, except in [29] where a multi-converter system is studied, the focus of existing research is often a single converter-grid interface, and a disproportionate share of research is focused on the AC side of the VSC.…”

Section: Introductionmentioning

confidence: 99%