NDLI: Online phase margin compensation strategy for a grid-tied inverter to improve its robustness to grid impedance variation

Content Provider	IET Digital Library
Author	Zheng, Chen Zhou, Lin Yu, Xirui Li, Bin Liu, Jinhong
Abstract	According to studies on active damping and the stability margin, grid impedance variation does not make active damping ineffective; instead, it attenuates the stability margin. The harmonic resonance mechanism of grid-tied inverters has been revealed by researching the influence of stability margin reduction on harmonic current amplification coefficients around the cut-off and phase crossover frequencies. With the stability margin decreasing, amplification to harmonics around relevant frequencies is strengthened. The harmonic resonance around the cut-off frequency is triggered as the stability margin decreases to zero. An online phase margin (PM) compensation strategy is proposed in this study to improve system robustness to grid impedance variation. The strategy is implemented by the lead network to enhance the phase and the proportional component to regulate the cut-off frequency according to the grid impedance measured online. Hence, the system can be maintained with a sufficient PM to mitigate the harmonic resonance caused by grid impedance. Simulation and experimental results validate the theoretical analysis presented in this study. Comparisons show that the proposed strategy is superior to the zero compensation strategy in suppressing the harmonic resonance.
Starting Page	611
Ending Page	620
Page Count	10
ISSN	17554535
Volume Number	9
e-ISSN	17554543
Issue Number	Issue 4, Mar (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/9/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2015.0196
Journal	IET Power Electronics
Publisher Date	2016-03-30
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Damping Control Engineering Computing Control of Electric Power System Cut-off Frequency Regulation Damping Electric Impedance Measurement Frequency Control Grid Impedance Measurement Grid Impedance Variation Grid-tied Inverter Harmonic Current Amplification Coefficient Harmonic Resonance Suppression Harmonics Impedance And Admittance Measurement Invertors Online Phase Margin Compensation Strategy Other Power Apparatus And Electric Machine Phase Crossover Frequency Power Electronics Power Engineering Computing Power Grid Power Harmonic Filter Power Supply Power Supply Quality Stability Stability in Control Theory Stability Margin Reduction Supervisory Circuit System Robustness Improvement
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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