NDLI: Direct current control strategy of LCL-type converter for harmonic suppression under distorted grid condition

Content Provider	IET Digital Library
Author	Wang, Qi Qin, Wenping Dai, Wei Han, Xiaoqing Wang, Lei Wang, Peng
Abstract	The grid voltage distortion represents a significant cause of the grid quality degradation when a renewable energy system is incorporated into the traditional grid. In this paper, a direct harmonic current control strategy is proposed for an LCL converter under distorted grid conditions. The proposed strategy improves the power quality and enhances the converter robustness under the non-ideal grid conditions. Traditionally, in the harmonic suppression strategy, the capacitor current is commonly used as a harmonic information source to control and suppress harmonics, which not only realises active damping, but also provides harmonic current suppression. Unlike the existing technologies, the proposed strategy realises the closed-loop control and harmonic current suppression by sampling the converter-side current. The proposed strategy can achieve a more efficient harmonic suppression than the traditional methods without requiring additional sensors and hidden danger of resonance. The impedance characteristics of multi loops are analysed when a distorted voltage is applied to the LCL converter. Then, the corresponding control strategy is proposed. The similarities and differences in harmonic suppression and stability between the proposed strategy and the traditional strategies are presented and discussed. Finally, the effectiveness and feasibility of the proposed strategy are verified by the simulation and experimental results.
Starting Page	3922
Ending Page	3930
Page Count	9
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 17, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2020.0898
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/17
Journal	IET Power Electronics
Publisher Date	2020-12-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Capacitor Current Closed Loop System Closed-loop Control System Control of Electric Power System Converter Robustness Converter-side Current Corresponding Control Strategy Current Control Damping Different Single-loop Current Feedback Strategy Direct Current Control Strategy Direct Harmonic Current Control Strategy Distorted Grid Condition Distorted Voltage Efficient Harmonic Suppression Electric Current Control Feedback Grid Quality Degradation Grid Voltage Distortion Harmonic Current Suppression Harmonic Information Source Harmonic Suppression Strategy Harmonics Harmonics Suppression LCL Converter LCL-type Converter Nonideal Grid Condition Other Power Apparatus And Electric Machine Power Converter Power Grid Power Harmonic Filter Power Supplies to Apparatus Power Supply Quality Traditional Grid Traditional Strategy
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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