Analysis and Design of DC Bus Voltage Control Regarding Third Harmonic Reduction and Dynamic Improvement for Half-Bridge Microinverter

Vongkoon, Pokkrong; Liutanakul, Pisit; Wiwatcharagoses, Nophadon

doi:10.1109/ecticon.2018.8619922

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The proposed control strategy consists in a simple PR controller to generate a sinusoidal current reference waveform and PI controller to generate a power reference. The paper [ 45 ] presents a two-stage microinverter and it consists in a step-up isolation dc-dc converter with half-bridge inverter. The control technique consists in a PI controller in order to reduce the third harmonic.…”

Section: Control Strategiesmentioning

confidence: 99%

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Review of Control Techniques in Microinverters

Rojas

Muñoz

Rivera

et al. 2021

Sensors

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The use of renewable energies sources is taking great importance due to the high demand for electricity and the decrease in the use of fossil fuels worldwide. In this context, electricity generation through photovoltaic panels is gaining a lot of interest due to the reduction in installation costs and the rapid advance of the development of new technologies. To minimize or reduce the negative impact of partial shading or mismatches of photovoltaic panels, many researchers have proposed four configurations that depend on the power ranges and the application. The microinverter is a promising solution in photovoltaic systems, due to its high efficiency of Maximum Power Point Tracking and high flexibility. However, there are several challenges to improve microinverter’s reliability and conversion efficiency that depend on the proper control design and the power converter design. This paper presents a review of different control strategies in microinverters for different applications. The control strategies are described and compared based on stability, dynamic response, topologies, and control objectives. One of the most important results showed that there is little research regarding the stability and robustness analysis of the reviewed control strategies.

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Section: Control Strategiesmentioning

confidence: 99%

“…The paper [ 45 ] presents a two-stage microinverter and it consists in a step-up isolation dc-dc converter with half-bridge inverter. The control technique consists in a PI controller in order to reduce the third harmonic.…”

Section: Control Strategiesmentioning

confidence: 99%

Review of Control Techniques in Microinverters

Rojas

Muñoz

Rivera

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…It distorts the reference current and causes an excessive third-order harmonic current to be injected into the grid. This problem is solved via power decoupling [3][4][5][6][7][8][9] or by improving the control scheme without additional circuits [10][11][12][13][14][15][16][17]. However, according to engineering design concepts, improving the control strategy without additional circuits is more interesting because it is simpler to implement, has lower cost, has no additional power loss, and does not complicate the overall circuitry.…”

Section: Introductionmentioning

confidence: 99%

“…However, the dynamic response of the voltage control loop should be considered, as the bandwidth of the voltage loop is extremely low at this sampling rate. This obstacle can be ameliorated by superimposing a compensated feedforward loop for the transient condition [17], although the system cost increases because of the required current sensor. Additionally, a small ripple occurs in the feedforward dc current in practice, which may increase the grid-injected harmonic current.…”

Section: Introductionmentioning

confidence: 99%

Effective low‐cost solution using cascaded connection of two modified notch filters to mitigate the second and third harmonic currents in single‐phase dual‐stage half‐bridge microinverter

Vongkoon

Liutanakul

Wiwatcharagoses

2019

IET Power Electronics

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On the grid side, the half-bridge topology of the microinverter is of interest for solar rooftop applications because of its high efficiency, low component count, and cost-effectiveness. However, it has an inherent double-line frequency ripple voltage on the dc-link, which causes the injection of a third-order harmonic current when the voltage control loop is closed. Furthermore, in practice, different average voltages or different capacitances of the two capacitors at the dc-link produce a second-order harmonic current that flows into the grid. In this paper, the analytical details of these harmonics are comprehensively described, and a simple and effective low-cost technique using the cascaded connection of two modified notch filters is proposed in the voltage control loop to mitigate their effects. The simulation and experimental results of a 300 W microinverter indicate that the proposed filters represent an effective low-cost solution and perform well in accordance with the IEEE 1547 standard, even if the capacitances at the dc-link are mismatched by 20%. Besides, the prototype is tested when occurring of the changing +1% of the line frequency, or appearing of the distorted waveform of grid voltage with the composition of 6% of fifth-order harmonic. Nomenclature Capital boldface italic letters such as V, represent phasors. Capital italic letters such as C 1 , represent constant variables. Small italic letters such as v dc (t), represent instantaneous variables depending on time. Small italic letters such as ṽ dc (t), represent small ac signals in the time domain. Capital italic letters such as G vp (s), represent transfer functions in the s-domain. Small italic letters such as v dc (s), represent signal variables in the s-domain.

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Design of an active front-end rectifier controller with an accurate estimation for the dynamic of its deadbeat current control loop

Ali

Naouar

2020

SN Appl. Sci.

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Analysis and Design of DC Bus Voltage Control Regarding Third Harmonic Reduction and Dynamic Improvement for Half-Bridge Microinverter

Cited by 5 publications

References 6 publications

Review of Control Techniques in Microinverters

Review of Control Techniques in Microinverters

Effective low‐cost solution using cascaded connection of two modified notch filters to mitigate the second and third harmonic currents in single‐phase dual‐stage half‐bridge microinverter

Design of an active front-end rectifier controller with an accurate estimation for the dynamic of its deadbeat current control loop

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