Full-State Feedback Equivalent Controller for Active Damping in &lt;inline-formula&gt; &lt;tex-math notation="LaTeX"&gt;$LCL$&lt;/tex-math&gt;&lt;/inline-formula&gt;-Filtered Grid-Connected Inverters Using a Reduced Number of Sensors

Busada, Claudio A.; Jorge, Sebastián Gómez; Solsona, J.

doi:10.1109/tie.2015.2424391

Cited by 119 publications

(58 citation statements)

References 33 publications

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“…On the other hand, grid-side current-based control schemes have also been thoroughly explored. 9,10,14 These works show that, if filter parameters and switching frequency are carefully designed, then grid-side-based controllers have a stable performance. However, they may present robustness issues due to grid impedance and filter parameter variations and may suffer of higher sensitivity to harmonic distortion.…”

Section: Introductionmentioning

confidence: 99%

“…Other approaches have proposed the estimation of those additional variables to avoid additional sensors. 8,14,19 However, these approaches require an exact knowledge of the system model, and may be sensitive to system parameter uncertainties and variations. Controllers using a proportional current loop, together with a first (or higher) order filter, connected in series with the current loop path, have also been proposed to improve the damping.…”

Section: Introductionmentioning

confidence: 99%

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Design of an inverter-side current reference and controller for a single-phase LCL-based grid-connected inverter

Escobar

Martinez‐Rodriguez

et al. 2017

Int Trans Electr Energ Syst

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Summary This paper presents the design of a current reference used in an inverter‐side current controller for a grid‐connected single‐phase transformerless inverter with an Inductive‐Capacitive‐Inductive of LCL filter. The idea is to indirectly control the inverter‐side current, by directly acting on the grid‐side current. Furthermore, it can be shown that the simple proportional term guarantees damping injection. However, the design of the current reference for such a controller is a more involved process, which turns out to be even more challenging in the case where the grid voltage signal is subject to harmonic distortion. In this case, the distortion propagates into the converter through the LCL filter. Therefore, an inverter‐side current reference must be proposed to be as distorted as necessary to assure indirect tracking of the grid‐side current towards its corresponding reference, which is built as a sinusoidal with a given phase displacement to allow reactive current injection. The inverter‐side controller must then include a harmonic compensation mechanism, to assure perfect tracking of the inverter‐side current towards its distorted reference, and thus, achieve an adequate performance under harmonic distortion. Experiments are performed in a prototype to evaluate the performance of the proposed controller.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of an inverter-side current reference and controller for a single-phase LCL-based grid-connected inverter

Escobar

Martinez‐Rodriguez

et al. 2017

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

show abstract

“…The simplicity of the design in the continoustime domain and the small difference in the performance for the parameters used in this research makes the solution in [41] appealing. It is also related with [43], but the more convenient converter side current is used instead of the grid side one. The proposed control strategy will estimate the grid-side current by using the converter-side current sensors and the voltage sensors at the PCC.…”

Section: A System Modelingmentioning

confidence: 99%

Observer-Based Pulsed Signal Injection for Grid Impedance Estimation in Three-Phase Systems

Garcia

Sumner

Navarro-Rodríguez

et al. 2018

IEEE Trans. Ind. Electron.

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Abstract-This paper addresses the estimation of the grid impedance and the control of grid-tied converters by combining pulsed-signal injection and observer based techniques. A Luenberger based observer is used for controlling the grid-side current of an LCL filter by only measuring the converter-side currents and the grid-side voltage. This configuration mitigates the effects of parameter variation at the LCL filter. Under grid impedance changes, the observer control signal will be used for triggering the signal injection. A Pulsed Signal Injection (PSI) approach is employed for estimating online the grid impedance using an RLS algorithm. Compared with existing grid-impedance estimation techniques, the proposed method can: 1) identify a generic RL grid impedance, even under unbalanced conditions; 2) reduce the distortion induced by the excitation signal by relying on the observer to triggering the injection when a grid impedance change is detected; 3) Identify grid impedance values much lower than the converter filter impedance, which is the usual situation when the converter rated power is well below the grid rating. Finally, it is worth pointing out that the proposed estimation technique is well suited to be incorporated into an adaptive current controller scheme.

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“…To minimize the number of sensors for multi-state feedback control, estimation algorithms should be used. Recently, studies in [76,77] and [78][79][80][81][82][83] separately gave some good examples for slide model control and full-state feedback control. Usually, sampling and control are implemented in digital signal processing (DSP).…”

Section: Implementation Costsmentioning

confidence: 99%

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Xie

2017

J. Mod. Power Syst. Clean Energy

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Grid-connected LCL-filtered inverters are commonly used for distributed power generators. The LCL resonance should be treated properly. Recently, many strategies have been used to damp the resonance, but the relationships between different damping strategies have not been thoroughly investigated. Thus, this study analyses the essential mechanisms of LCL-resonance damping and reviews state-of-the-art resonance damping strategies. Existing resonance damping strategies are classified into those with single-state and multi-state feedback. Singlestate feedback strategies damp the LCL resonance using feedback of a voltage or current state at the resonance frequency. Multi-state feedback strategies are summarized as zero-placement and pole-placement strategies, where the zero-placement strategy configures the zeros of a novel state combined by multi-state feedback, while the poleplacement strategy aims to assign the closed-loop poles freely. Based on these mechanisms, an investigation of single-state and multi-state feedback is presented, including detailed comparisons of the existing strategies. Finally, some future research directions that can improve LCL-filtered inverter performance and minimize their implementation costs are summarized.

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Full-State Feedback Equivalent Controller for Active Damping in <inline-formula> <tex-math notation="LaTeX">$LCL$</tex-math></inline-formula>-Filtered Grid-Connected Inverters Using a Reduced Number of Sensors

Cited by 119 publications

References 33 publications

Design of an inverter-side current reference and controller for a single-phase LCL-based grid-connected inverter

Design of an inverter-side current reference and controller for a single-phase LCL-based grid-connected inverter

Observer-Based Pulsed Signal Injection for Grid Impedance Estimation in Three-Phase Systems

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

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