Comparison of harmonic reduction of 2LLCL and 2LCL filters based on single phase inverter with H6 configuration

Keshavarz, Majid; Sadeghzade, Seyed Mohammad; Rafie, Mostafa; Khamehchi, Mohammad Mahdi

doi:10.1002/etep.2020

Cited by 4 publications

(8 citation statements)

References 17 publications

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“…The design of these BPFs follows the guidelines presented in Clayton et al 25 The proportional gain of the PR controller (8) is fixed to K 1 = 10, while the gains of the BPFs are fixed to 1 = 94, 3 = 103, 5 = 7 = 82, 9 = 71, 11 = 50 and the quality factors are fixed to Q 1 = 93, Q 3 = Q 5 = 90, Q 7 = Q 9 = 92, Q 11 = 88. The parameters of estimator ofv G,1 described by (16) to (18) are fixed to 1 = 250, 3 = 400, 5 = 7 = 300, 9 = 30, and 11 = 50, which are obtained according to (19). Unless otherwise indicated, the power reference is fixed to P * = 700 W. Figure 8 shows the responses achieved in the steady state with the proposed scheme.…”

Section: Experimental Testsmentioning

confidence: 99%

“…Connection through LCL filters is capable to comply with output current harmonic distortion standards such as the IEEE Std 519 and IEEE Std 929, by using smaller inductances values than in the first order inductive filter (L) connections. [2][3][4] These features make LCL filters a more convenient solution in terms of physical space and costs. Moreover, an LCL filter represents a good candidate for higher power applications, where the switching frequency is limited.…”

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: Experimental Testsmentioning

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 transformer copper losses of the proposed micro-inverter can be estimated by [29][30][31] P cop ¼ P cop1 þ P cop2 P cop1 ¼ R ac I 2 pri;rms1 þ R dc I 2 pri;avg1 V e and A e are effective core volume and effective cross-sectional area of the core, respectively.…”

Section: Transformer Lossesmentioning

confidence: 99%

“…Litz wire with low diameter strands is applied in high-frequency transformer windings to minimize these effects. The transformer copper losses of the proposed micro-inverter can be estimated by [29][30][31]…”

Section: Transformer Lossesmentioning

confidence: 99%

A new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter

Mohammadi

Izadfar

Eskandarian

2019

Int Trans Electr Energ Syst

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Summary This paper proposes a new adaptive clamp based on the hybrid operation of the interleaved two‐switch flyback micro‐inverter in one‐phase and two‐phase discontinuous conduction modes (DCM) depending on the output power of the PV panel. The proposed adaptive clamp controls the second switch of the two‐switch flyback structure based on the drain‐to‐source voltage spike of the flyback's main switch during the turn‐off process. Thus, in low‐voltage regions, a conventional flyback (single‐switch) operation is achieved with reduced switching, gate driving, and clamp diodes losses. Also, in the low output powers of the micro‐inverter, only one phase of the micro‐inverter operates to decrease the power loss associated with one phase. The theoretical analysis, simulation, and experimental results show the effectiveness of the proposed adaptive clamp and the phase control methods in improving the efficiency in all power ranges.

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“…The nonlinear inductance charging with the output current can be estimated online using (18). The control parameters in (16) of the dead beat controller are updated in every fundamental period on the basis of the estimated inductance.…”

Section: Implementation Of the Photovoltaic Power Control Based On Dementioning

confidence: 99%

Novel optimal control strategy for power fluctuation and current harmonic suppression of a three-phase photovoltaic inverter under unbalanced grid faults

Zhou

Lou

et al. 2015

Int. Trans. Electr. Energ. Syst.

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Summary Under unbalanced grid faults, the output currents of a photovoltaic (PV) system injected into the grid lose their sinusoidal and balanced appearance. The interaction between such unbalanced currents and voltages leads to fluctuations in active and reactive powers. This study investigates the instantaneous output power characteristics of a PV inverter and its flexible power control strategy under unbalanced grid faults. A new optimal parameter model of power control is established to generate minimal integrated power fluctuations under the constraint of harmonic distortion in the output current. Finally, the optimal power control of the PV inverter based on dead beat current tracking is realized. The feasibility of the proposed control strategy is verified with the power system transient software PSCAD/EMTDC. Copyright © 2015 John Wiley & Sons, Ltd.

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Comparison of harmonic reduction of 2LLCL and 2LCL filters based on single phase inverter with H6 configuration

Cited by 4 publications

References 17 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

A new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter

Novel optimal control strategy for power fluctuation and current harmonic suppression of a three-phase photovoltaic inverter under unbalanced grid faults

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