NDLI: Passivity-based output admittance shaping of the converter-side current-controlled grid-tied inverter to improve the robustness to the grid impedance

Content Provider	IET Digital Library
Author	Qian, Qiang Xie, Shaojun Xu, Jinming Bian, Shenyiyang Zhong, Nini
Abstract	In the LCL-filtered grid-tied inverter, the classical low-cost control strategy which is composed of the single converter-side current control and the unit grid voltage feedforward compensation, is commonly employed to inject the sinusoidal current into the utility. However, the inverter output admittance features the non-passive behaviour, which indicates that the harmonic currents may be amplified under the disturbances of the grid voltage and the grid impedance. Therefore, two dedicated current loops based on only the converter-side current feedback are proposed, which consist of the low-pass filter-based current regulation and the high-pass filter-based active damping (HFAD). The mixed asymmetrical regular sampling method is further used to reduce the control delay of the HFAD. Moreover, the low-pass filter-based feedforward is developed to make a compromise between the disturbance rejection and the stability. Fair comparisons with other typical control strategies are made through analysing the virtual resistor in parallel with the filter capacitor, which reveals that the positive virtual resistance at the frequency lower than half of the switching frequency is maintained. With the elaborated control parameters, the exhaustive experimental results finally verify the effectiveness of the proposed method in passivating the inverter output admittance.
Starting Page	1956
Ending Page	1965
Page Count	10
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 10, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.0770
Journal	IET Power Electronics
Publisher Date	2020-03-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control Delay Control of Electric Power System Converter-side Current Feedback Converter-side Current-controlled Grid-tied Inverter Current Control Damping Dedicated Current Loops Elaborated Control Parameter Electric Current Control Feedback Feedforward Filter Capacitor Grid Impedance Harmonic Content Harmonics High-pass Filter-based Active Damping Inverter Output Admittance Invertors LCL-filtered Grid-tied Inverter Low-cost Control Strategy Low-pass Filter Low-pass Filter-based Current Regulation Low-pass Filter-based Feedforward Mixed Asymmetrical Regular Sampling Method Nonpassive Behaviour Other Power Apparatus And Electric Machine Passivity-based Output Admittance Power Converter Power Filter Power Grid Power Harmonic Filter Power Supplies to Apparatus Power Supply Quality Single Converter-side Current Control Typical Control Strategy Unit Grid Voltage Feedforward Compensation Voltage Control
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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