NDLI: 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

Content Provider	IET Digital Library
Author	Vongkoon, Pokkrong Liutanakul, Pisit Wiwatcharagoses, Nophadon
Abstract	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.
Starting Page	3118
Ending Page	3130
Page Count	13
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 12, Oct (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5638
Journal	IET Power Electronics
Publisher Date	2019-07-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bridge Circuit Building Integrated Photovoltaics Cascaded Connection Control of Electric Power System Cost-effectiveness Dc-link Double-line Frequency Ripple Voltage Effective Low-cost Technique Fifth-order Harmonic Filter And Other Network Grid Voltage Half-bridge Topology Harmonics Invertors Low Component Count Modified Notch Filter Notch Filter Other Power Apparatus And Electric Machine Photovoltaic Power System Power 300.0 W Power Conversion Harmonics Power Converter Power Generation Control Power Grid Power Harmonic Filter Power Supply Quality Second Harmonic Current Mitigation Single-phase Dual-stage Half-bridge Microinverter Solar Cell And Array Solar Cell Array Solar Power Stations Solar Rooftop Application Third Harmonic Current Mitigation Voltage Control Voltage Control Loop
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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