NDLI: Feedforward phase compensation method of LCL grid-connected inverter based on all-pass filter in weak grid

Content Provider	IET Digital Library
Author	Xue, Tongyu Sun, Pengju Xu, Zezhong Luo, Quanming
Abstract	Inverter-side current feedback control (ICFC) has been extensively adopted in distributed generation systems because of its simple implementation and better consistency with actual operating conditions. At the same time, when there are a large number of background harmonics in the grid, capacitor voltage feedforward (CVF) is usually added to the system for its suppression. This method could make the system keep the first-order characteristics under the analogue control. However, under digital control, due to the digital control delay, a reverse resonance peak will be generated in the loop gain, which makes the system unstable in the weak grid. In order to solve the aforementioned problems, this study proposes a feedforward phase compensation method of LCL grid-connected inverter based on the all-pass filter (AF). By introducing AF into the CVF channel, the phase lag in the range of reverse resonance peak frequency is compensated, so as to enhance the robustness of the system in the weak grid. At the same time, this study gives the detailed design process of the proposed method. Experimental results on a 3-kW prototype are provided, and the effectiveness of the proposed control method is verified..
Starting Page	4407
Ending Page	4416
Page Count	10
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 19, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/19
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2020.0897
Journal	IET Power Electronics
Publisher Date	2020-12-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Actual Operating Condition All-pass Filter Analogue Control Capacitor Voltage Feedforward Compensation Control Method Control of Electric Power System Current Control Digital Control Digital Control Delay Distributed Generation System Distributed Power Generation Electric Current Control Feedback Feedforward Feedforward Phase Compensation Method Grid Impedance Inverter-side Current Feedback Control Invertors LCL Grid-connected Inverter Other Power Apparatus And Electric Machine Phase Lag Power Converter Power Filter Power Grid Power Supplies to Apparatus Reverse Resonance Peak Changes Reverse Resonance Peak Frequency Weak Grid
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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