Analysis of the Influence of Active Power Load Fluctuation on the Stability of Distributed Generation Grid-connected Inverter and Improved Control Strategy

被引：0
|
作者：
Jiang Y. [1 ]
Tian Y. [1 ]
Li Y. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University, Baoding, 071003, Hebei Province
来源：
Dianwang Jishu/Power System Technology | 2020年 / 44卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Compensation control; Grid-connected inverter; Impedance stability; Power influence;
D O I：
10.13335/j.1000-3673.pst.2019.0450
中图分类号：
学科分类号：
摘要：
Aiming at the problem of grid-connected stability fluctuation of the inverter when power changes, the paper takes three-phase LCL-type grid-connected inverter considering the influence of phase-lock loop in the system as an example based on impedance stability criterion and establishes the output impedance small-signal model with grid-connected inverter controlled by current loop to analyze the interactive influence between power change and system stability. The DC-link proportional control compensation is introduced to research the situation that the increase of transmission power causes the deterioration of the system stability. The strategy effectively deals with the system stability caused by the power by improving the output impedance gain of the grid-connected inverter in the low frequency band to increase the system stability margin. Meanwhile, the grid-connected inverter system introduced the dc-link current compensation holds the shorter regulation time which only about 30% compared with the original system and faster response no matter in the steady state or the transient state in terms of the response speed. Finally, the three-phase LCL-type grid-connected inverter simulink platform was established to verify the correctness of the theoretical analysis. © 2020, Power System Technology Press. All right reserved.
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页码：646 / 654
页数：8
相关论文
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