Inverter-Current-Feedback Resonance-Suppression Method for LCL-Type DG System to Reduce Resonance-Frequency Offset and Grid-Inductance Effect

被引：77

作者：

Zhou, Leming ^{[1
]}

Zhou, Xiaoping ^{[1
]}

Chen, Yandong ^{[1
]}

Lv, Zhipeng ^{[2
]}

He, Zhixing ^{[1
]}

Wu, Wenhua ^{[1
]}

Yang, Ling ^{[1
]}

Yan, Kui ^{[3
]}

Luo, An ^{[1
]}

Guerrero, Josep M. ^{[4
]}

机构：

[1] Hunan Univ, Coll Elect & Informat Engn, Changsha 410006, Hunan, Peoples R China

[2] China Elect Power Res Inst, Beijing 100192, Peoples R China

[3] Changsha Univ Sci & Technol, Changsha 410205, Hunan, Peoples R China

[4] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark

来源：

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2018年 / 65卷 / 09期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Active damping; grid inductance; inverter current feedback; resonant-frequency offset; weak grid; CONNECTED INVERTER; FILTERS; CONVERTERS; DESIGN; GENERATION; ROBUSTNESS; CONTROLLER;

D O I：

10.1109/TIE.2018.2795556

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

For the LCL-type grid-connected distributed generation system, the grid-current-feedback active damping (GCFAD) methods have a conflict between the resonance-suppression ability and harmonic-currents amplification. For this, an inverter-current-feedback resonance- suppression (ICFRS) method without additional sensors is proposed to reduce resonance-frequency offset and grid-inductance effect due to its unattenuated damping characteristic under high-frequency bandwidth. By analyzing two types of equivalent impedance models of ICFRS and GCFAD with a high-pass filter (HPF), GCFAD can suppress the resonance peak well only with a large resonancefrequency offset and might result in a narrow control bandwidth. However, ICFRS can suppress the resonance peak well with smaller resonance-frequency offset and maintain a high power quality compared with GCFAD. Considering the influence of control delay and grid inductance, the positive/ negative critical point of an equivalent virtual resistance of ICFRS derived in the interval of [1/6, 1/3) is obtained, and a robust ICFRS is further proposed to improve system stability by maintaining a positive resistance regardless of gridinductance variation. The stable-state and dynamic properties of the overall system are analyzed in detail in this paper, and its proper control parameters are selected without a complicated trial. Finally, simulation and experimental results verify the validity of the proposed method.

引用

页码：7036 / 7048

页数：13

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