Active Damping based on the Capacitor Voltage Positive-Feedback for Grid-Connected Power Converters with LCL filter

Samanes, Javier; Gubía, E.

doi:10.23919/epe.2019.8914778

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…Many active damping solutions focus on additional capacitor current [14] or voltage sensors [15] to implement active damping due to simplicity. However, the current control objective can be used as a feedback method for active damping, removing additional sensors that are required in conventional active damping techniques [16].…”

Section: Introductionmentioning

confidence: 99%

A Unified Active Damping for Grid and Converter Current Feedback in Active Front End Converters

et al. 2022

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The Active Front End (AFE) is interconnected to the grid with an LCL filter to reduce the switching harmonics. Possible resonances induced by the LCL filter can be damped using Active Damping (AD). In AFE applications, the current sensor can be placed on either the grid-side or the converter-side, resulting in different frequency responses. This paper presents a novel active damping approach that is universally applicable to all active front end converters regardless of whether the current sensor is placed on the grid side or the converter side. At the heart of the proposed approach is a practically implementable fourth-order filter that dampens the resonance whilst being capable of mitigating the challenges associated with both grid current feedback and converter current feedback. These include amplifications associated with derivatives in active damping term with grid current feedback and high susceptibility to instability with converter current feedback due to digital delay. The proposed active damping is thoroughly investigated in terms of practical implementation issues such as different LCL filter parameters, different sampling methods, grid impedance, and digital delay. The approach is experimentally validated on motor drives consisting of 2 two-level three-phase converters interfaced with a dSPACE rapid control prototyping system across a wide range of resonant frequencies and PWM sampling methods. Stability analysis is performed on both current control methods to validate that active damping assures stable operation for a wide range of resonant frequencies and grid impedance.INDEX TERMS Active front end converter, active damping, digital delay, discrete system, stability analysis, resonance damping, current control, LCL filter.

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Section: Introductionmentioning

confidence: 99%

A Unified Active Damping for Grid and Converter Current Feedback in Active Front End Converters

et al. 2022

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“…It highly simplifies the plant to be controlled, which becomes equal to the converter inductor admittance [6]. However, due to the delays of the digital control loop, it may destabilize the system as the LCL resonance frequency becomes closer to the controller sampling frequency [7].…”

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confidence: 99%

Robust Active Damping Strategy for DFIG Wind Turbines

Rosado

Samanes

Gubía

et al. 2021

IEEE Trans. Power Electron.

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Doubly-fed induction generators (DFIG) with LCL filter are widely used for wind power generation. In these energy conversion systems, there is an interaction between the grid side converter (GSC) and the rotor side converter (RSC) control loops, the generator and the LCL filter that must be properly modeled. Such interaction between the GSC and the RSC proves to have a significant influence on the stability. Several active damping (AD) methods for grid-connected converters with LCL filter have been proposed, nevertheless, the application of these techniques to a DFIG wind turbine is not straightforward, as revealed in this work. To achieve a robust damping irrespective of the grid inductance, this paper proposes an AD strategy based on the capacitor current feedback and the adjustment of the control delays to emulate a virtual impedance, in parallel with the filter capacitor, with a dominant resistive component in the range of possible resonance frequencies. This work also proves that, by applying the AD strategy in both converters simultaneously, the damping of the system resonant poles is maximized when a specific value of the grid inductance is considered. Experimental results show the interaction between the GSC and the RSC and validate the proposed AD strategy.

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A higher-order filter approach to implement grid current based active damping in active front end converters

Matijevi

Sharma

Zare

2020

2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

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Active Damping based on the Capacitor Voltage Positive-Feedback for Grid-Connected Power Converters with LCL filter

Cited by 4 publications

References 15 publications

A Unified Active Damping for Grid and Converter Current Feedback in Active Front End Converters

A Unified Active Damping for Grid and Converter Current Feedback in Active Front End Converters

Robust Active Damping Strategy for DFIG Wind Turbines

A higher-order filter approach to implement grid current based active damping in active front end converters

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