Investigation of Nonlinear Droop Control in DC Power Distribution Systems: Load Sharing, Voltage Regulation, Efficiency, and Stability

被引：124

作者：

Chen, Fang ^{[1
]}

Burgos, Rolando ^{[1
]}

Boroyevich, Dushan ^{[1
]}

Vasquez, Juan C. ^{[2
]}

Guerrero, Josep M. ^{[2
]}

机构：

[1] Virginia Tech, Bradley Dept Elect & Comp Engn, Ctr Power Elect Syst, Blacksburg, VA 24061 USA

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

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2019年 / 34卷 / 10期

关键词：

Constant power load (CPL); current sharing; dc microgrids; droop; efficiency; nonlinear; stability; voltage regulation; MICROGRIDS;

D O I：

10.1109/TPEL.2019.2893686

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

080906 [电磁信息功能材料与结构]; 082806 [农业信息与电气工程];

摘要：

Linear droop faces the design tradeoff between voltage regulation and load sharing due to cable resistances and sensing errors. Using a larger droop resistance improves load sharing, but requires a wider droop voltage range. In the nonlinear droop, droop resistance is a function of the converter's output current, and its value increases when the output current increases. As a result, the impacts from sensors and cables are reduced. In this paper, the design of nonlinear droop in dc power distribution systems is studied with special emphasis on load sharing, voltage regulation, system efficiency, and stability. After discussing the piecewise linear and nonlinear droop control, a generic polynomial expression is presented to unify different droop equations. The impact of droop on dc system efficiency is analyzed by evaluating cable and power converter losses. The converter's output impedance using nonlinear droop is modeled to analyze the system stability with constant power loads. The selection and design guidelines of nonlinear droop are summarized, considering both the static performance and interaction with load systems. The analysis is verified in 400-V multi-source dc systems. The nonlinear droop is fully distributed as it only needs local information.

引用

页码：9404 / 9421

页数：18

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