Guidelines to Classical Frequency-Domain Disturbance Observer Redesign for Enhanced Rejection of Periodic Uncertainties and Disturbances

Elkayam, Moria; Kolesnik, Sergei; Kuperman, Alon

doi:10.1109/tpel.2018.2865688

Cited by 38 publications

(19 citation statements)

References 37 publications

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“…In general, the gain (phase) of the controller (3) at any finite ω C (4) is above unity (below zero) and should be accounted for, in case Assumption 1 does not hold. It should be mentioned that guidelines for selection of α r in (3) were not provided in [22], but it was shown in [25] that the damping term actually sets the resonant notch bandwidth, imposing system robustness to fundamental frequency variations.…”

Section: Optimised Single‐resonant Controllermentioning

confidence: 99%

Guidelines for generalised quantitative frequency domain design of optimised multi‐resonant AC current regulators for grid‐connected inverters

Elkayam

Kuperman

2020

IET Renewable Power Generation

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Section: Optimised Single‐resonant Controllermentioning

confidence: 99%

Guidelines for generalised quantitative frequency domain design of optimised multi‐resonant AC current regulators for grid‐connected inverters

Elkayam

Kuperman

2020

IET Renewable Power Generation

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“…with K and G denoting proportional and resonant gains, respectively, and ω r representing resonant term bandwidth [8]. The controller possesses high gain at ω 0 , thus the closed-loop system is capable of tracking and rejecting signals at the corresponding frequency with a negligible steady-state error.…”

Section: Fig 1 Generalised Representation Of a Grid-connected Invertermentioning

confidence: 99%

“…5. Solve the system of three equations, (8) and (10) to obtain ω C , G and K using available computational software package. 6.…”

Section: Fig 1 Generalised Representation Of a Grid-connected Invertermentioning

confidence: 99%

Generalised optimised design of single‐resonant AC current regulators

Elkayam

Kuperman

2019

Electron. lett.

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This Letter generalises frequency-domain oriented design guidelines for optimised single-resonant three-parameter AC current regulators for grid-connected converters. Unlike in previously established set of design guidelines, possible practical restrictions imposed by relatively low-switching frequency are taken into account in the proposed methodology. In addition, resonant term bandwidth is selected according to the desired robustness to fundamental frequency variations. As a result, a closed set of three non-linear equations is created. The solution maximises the loop gain crossover frequency for a given phase margin while respecting frequency robustness and resonant gain restrictions, set a priori.

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“…In an AC power converter, a frequency-domain DO-based control was used to attenuate periodic uncertainties and disturbances [14]. In a DC-DC converter, the DO detected unmodeled effects, which were considered as lumped disturbance, and the disturbance was attenuated [15].…”

Section: Introductionmentioning

confidence: 99%

Optimal Disturbance Observer Design for High Tracking Performance in Motion Control Systems

Kim

Suh

2020

Mathematics

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In this paper, a stability-driven optimal disturbance observer (DO) is proposed. The proposed method does not require any plant inverse dynamics to detect introduced disturbances or a stabilizing Q filter. It does not require additional compensators to resolve causality problems, due to the relative degree, or filters to solve instability problems of non-minimum phase plants. Using this method enables wideband and narrowband disturbances to be attenuated by simply multiplying the corresponding peak filters by the baseline weight function. Furthermore, the proposed DO guarantees the stability of closed-loop systems because the already designed outer-loop systems are considered as a target plant to be stabilized and because of the Lyapunov stability-based H∞ control. In the application example, it was confirmed that the proposed method is effective, and the position error signals were improved by 20.9% in commercial hard disk drives and 36.6% in optical image stabilization systems.

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Guidelines to Classical Frequency-Domain Disturbance Observer Redesign for Enhanced Rejection of Periodic Uncertainties and Disturbances

Cited by 38 publications

References 37 publications

Guidelines for generalised quantitative frequency domain design of optimised multi‐resonant AC current regulators for grid‐connected inverters

Guidelines for generalised quantitative frequency domain design of optimised multi‐resonant AC current regulators for grid‐connected inverters

Generalised optimised design of single‐resonant AC current regulators

Optimal Disturbance Observer Design for High Tracking Performance in Motion Control Systems

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