NDLI: Effects on oscillation mechanism and design of grid-voltage feedforward in grid-tied converter under weak grid

Content Provider	IET Digital Library
Author	Wang, Guoning Du, Xiong Shi, Ying Yang, Yougeng Sun, Pengju Li, Guanghui
Abstract	Grid-voltage feedforward control is widely used in grid-tied converters. The reported studies show that the grid-voltage feedforward may reduce the system stability margin, and may lead to oscillation problem in renewable power generation system. This study revisits the effect of voltage feedforward control on system stability and especially focuses on low frequency oscillation with impedance-based method. The low frequency oscillation usually happens in industry around 100 Hz and shows frequency coupling characteristics. A converter equivalent impedance which includes the effects of voltage feedforward and also covers the frequency coupling introduced by phase locked loop (PLL) is established. Based on the built impedance, the effect on oscillation mechanism with voltage feedforward and PLL is revealed. The results show that the voltage feedforward could increase the system stability margin and may be employed to improve the system stability. Then how to design an optimal proportional voltage feedforward control is demonstrated. Experimental results verify the theoretical analysis and the design of the proportional grid-voltage feedforward control.
Starting Page	1094
Ending Page	1101
Page Count	8
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 5, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5232
Journal	IET Power Electronics
Publisher Date	2019-01-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control of Electric Power System Converter Equivalent Impedance Current Control Electric Current Control Feedforward Frequency Coupling Characteristic Grid-tied Converter Impedance-based Method Low Frequency Oscillation Optimal Control Optimal Proportional Voltage Feedforward Control Oscillation Mechanism Oscillation Problem Phase Locked Loop PLL Power Converter Power Grid Power Supplies to Apparatus Power System Control Power System Stability Proportional Control Proportional Grid-voltage Feedforward Control Renewable Power Generation System System Stability Margin Voltage Control Voltage Feedforward Control Effect Weak Grid
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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