Large-Signal Stability Improvement of DC-DC Converters in DC Microgrid

被引：77
作者：
Gui, Yonghao [1 ]
Han, Renke [2 ]
Guerrero, Josep M. [3 ]
Vasquez, Juan C. [3 ]
Wei, Baoze [3 ]
Kim, Wonhee [4 ]
机构：
[1] Aalborg Univ, Dept Elect Syst, DK-9220 Aalborg, Denmark
[2] Univ Oxford, Dept Engn Sci, Oxford OX5 1PF, Oxon, England
[3] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark
[4] Chung Ang Univ, Sch Energy Syst Engn, Seoul 06974, South Korea
来源：
IEEE TRANSACTIONS ON ENERGY CONVERSION | 2021年 / 36卷 / 03期
基金：
新加坡国家研究基金会;
关键词：
DC-DCconverter; DCmicrogrid; constant power load; exponentially stable; disturbance observer; CONSTANT POWER LOADS; BOOST CONVERTER; STABILIZATION; DROOP; CONTROLLER; MODEL;
D O I：
10.1109/TEC.2021.3057130
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
In DC microgrids, constant power loads (CPLs) reduce the effective damping of the DC-DC converter and may induce destabilizing effects into the DC-DC converter. To overcome such problems regarding CPL and ensure large-signal stability of DC-DC converters in DC microgrids, some feedforward terms are added to V-I droop-based dual-loop controller for a DC-DC converter based on the large-signal model. It is proven that the feedforward terms can not only improve the transient response but also guarantee the exponential stability of the closed-loop system in the whole operating range in regards to a large-signal manner, which is verified by using a singular perturbation model. Moreover, a disturbance observer is designed to estimate the output current, thereby enabling the removal of the current measurement sensor. The proposed technique can be easily plugged into a pre-defined V-I droop-based dual-loop controller without an additional sensor being required. Ultimately, both simulation and experimental tests verify the effectiveness of the proposed method.
引用
收藏
页码：2534 / 2544
页数：11
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