A novel cascaded control to improve stability and inertia of parallel buck-boost converters in DC microgrid

被引：34
作者：
Cheng, Zhiping [1 ]
Li, Zhongwen [1 ]
Li, Shuihui [2 ]
Gao, Jinfeng [1 ]
Si, Jikai [1 ]
Das, Himadry Shekhar [2 ]
Dong, Weizhen [2 ]
机构：
[1] Zhengzhou Univ, Sch Elect Engn, Zhengzhou 450001, Peoples R China
[2] Univ Alabama, Dept Elect & Comp Engn, Tuscaloosa, AL 35487 USA
来源：
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS | 2020年 / 119卷
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Buck-boost Converter; DC microgrid; Droop control; Nonsingular terminal sliding-mode control (NTSMC); Virtual inertia control; SLIDING-MODE CONTROL; ADAPTIVE DROOP CONTROL; STRATEGY; LOAD;
D O I：
10.1016/j.ijepes.2020.105950
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
To deal with the issues caused by the high integration of renewable resources, the parallel operation of the converters is generally required to improve the system stability and reliability. To support the parallel operation of buck-boost DC/DC converters, they are generally regulated by a cascaded control strategy, which includes droop control loop, and nested proportional-integral (PI) based voltage and current control loops. However, it can provide barely inertia support and needs precise system model to reach the desired performance. In order to overcome these drawbacks, this paper proposes a novel cascaded control strategy for parallel operation of buck-boost DC/DC converters. The proposed cascaded control strategy involves a voltage synchronization loop, a virtual inertia control (VIC) loop, and two nested NTSMC based voltage and current control loops. The voltage synchronization controller can enable the plug and play requirements by synchronizing the output voltage of the converter with the voltage at the point of common coupling (PCC) before connecting a DC/DC converter to the DC microgrid. The VIC can improve the inertia of the converter-interfaced DGs. The nested-loop NTSMC based voltage and current controller can improve the robustness of converter system. Hardware experiments demonstrate the improved performance of the proposed control strategy.
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页数：10
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