孙贺;张建成;付超;孙玉巍;

• 1:新能源电力系统国家重点实验室(华北电力大学)

摘要(Abstract)：

为解决作为中压直流配网与低压直流微网互联设备的直流固态变压器(DC solid state transformer,DCSST)子模块均压均流问题,同时实现微网直流母线电压的稳定控制及灵活双向功率运行能力,提出了一种以DCSST输出电压稳定为主控制环,输入电压均衡为附加控制环的双环解耦控制策略。针对其输入串联输出并联(input-series output-parallel,ISOP)结构及隔离型双向DC/DC变换器(isolated bidirectional DC/DC converter,IBDC)移相控制原理,对DCSST进行统一建模,并通过对其小信号线性模型及传递函数的推导,分析了两控制环路之间的解耦条件。仿真与实验结果表明,在所提出的控制策略以及控制参数下,DCSST双向功率运行时输出电压稳定与输入电压均衡控制效果良好,同时,各IBDC模块采用交错控制可有效减小输出电流纹波。

关键词(KeyWords)： 直流配网;直流微网;直流固态变压器;解耦控制;输入串联输出并联;均衡控制;交错控制

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51177047);; 河北省科技计划项目(16214504D)~~

作者(Author): 孙贺;张建成;付超;孙玉巍;

Email:

DOI: 10.13335/j.1000-3673.pst.2017.1006

参考文献(References)：

• [1]Salomonsson D,Sannino A.Low-voltage dc distribution system for commercial power systems with sensitive electronic loads[J].IEEE Transactions on Power Delivery,2007,22(3):1620-1627.
• [2]孙栩,曹士冬,卜广全,等.架空线柔性直流电网构建方案[J].电网技术,2016,40(3):678-682.Sun Xu,Cao Shidong,Bu Guangquan,et al.Construction scheme of overhead line flexible HVDC grid[J].Power System Technology,2016,40(3):678-682(in Chinese).
• [3]刘嘉超,袁志昌,李岩,等.柔性直流技术在负荷中心分网运行的应用[J].电网技术,2016,40(3):683-688.Liu Jiachao,Yuan Zhichang,Li Yan,et al.Application of VSC-HVDC technology in synchronous system segmentation of load center[J].Power System Technology,2016,40(3):683-688(in Chinese).
• [4]韩继业,李勇,曹一家,等.基于模块化多电平型固态变压器的新型直流微网架构及其控制策略[J].电网技术,2016,40(3):733-740.Han Jiye,Li Yong,Cao Yijia,et al.A New DC Microgrid Architecture Based on MMC-SST and Its Control Strategy[J].Power System Technology,2016,40(3):733-740.
• [5]刘鑫蕊,谢志远,孙秋野,等.低压双极性直流微网故障分析及保护方案[J].电网技术,2016,40(3):749-755.Liu Xinrui,Xie Zhiyuan,Sun Qiuye,et al.Fault Analysis and Protection for LV Bipolar DC Microgrid[J].Power System Technology,2016,40(3):749-755.
• [6]和敬涵,李智诚,王小君,等.计及多种控制方式的直流电网潮流计算方法[J].电网技术,2016,40(3):712-718.He Jinghan,Li Zhicheng,Wang Xiaojun,et al.Power flow algorithm for DC grid considering various control modes[J].Power System Technology,2016,40(3):712-718(in Chinese).
• [7]Haroun R,El Aroudi A,Cid-Pastor A,et al,Stability issues in cascade connected switching converters for DC microgrid applications[C]//International Symposium on Circuits and Systems,Beijing,China:IEEE,2013:1324-1327.
• [8]Nobrega Tahim A P,Pagano D J,Lenz E,et al.Modeling and stability analysis of islanded DC microgrids under droop control[J].IEEE Transactions on Power Electronics,2015,30(8):4597-4607.
• [9]Xu L,Chen D.Control and operation of a DC microgrid with variable generation and energy storage[J].IEEE Transactions on Power Delivery,2011,26(4):2513-2522.
• [10]吴卫民,何远彬,耿攀,等.直流微网研究中的关键技术[J].电工技术学报,2012,27(1):98-106.Wu Weimin,He Yuanbin,Geng Pan,et al.Key technologies for DC micro-grids[J].Transaction of China Electrotechnical Society,2012,27(1):98-106(in Chinese).
• [11]Jalakas T,Vinnikov D,Laugis J.Evaluation of different loss calculation methods for high-voltage IGBT-s under small load conditions[C]//Power Electronics and Motion Control Conference.Poznan,Poland:IEEE,2008:1263-1267.
• [12]Das S C,Narayanan G,Tiwari A.Experimental study on the dependence of IGBT switching energy loss on DC link voltage[C]//IEEE International Conference on Power Electronics,Drives and Energy Systems.Mumbai,India:IEEE,2014:1-5.
• [13]Kim J-W,Yon J-S,Cho B H.Modeling,control,and design of inputseries-output-parallel-connected converter for high-speed-train power system[J].IEEE Transactions on Industrial Electronics,2001,48(3):536-544.
• [14]Sha D,Guo Z,Liao X.Cross-feedback output-current-sharing control for input-series-output-parallel modular DC-DC converters[J].IEEE Transactions on Power Electronics,2010,25(11):2762-2771.
• [15]Shi J,Luo J,He X.Common-duty-ratio control of input-series outputparallel connected phase-shift full-bridge DC-DC converter modules[J].IEEE Transactions on Power Electronics,2011,26(11):3318-3329.
• [16]马学军,牛金红,康勇.输入串联输出并联的双全桥变换器输入电容均压问题的研究[J].中国电机工程学报,2006,26(16):86-91.Ma Xuejun,Niu Jinhong,Kang Yong.Study on input-series-outputparallel converter with voltage sharing between input-capacitor[J].Proceedings of the CSEE,2006,26(16):86-91(in Chinese).
• [17]程璐璐,阮新波,章涛.输入串联输出并联的直流变换器控制策略研究[J].中国电机工程学报,2006,26(22):67-73.Cheng Lulu,Ruan Xinbo,Zhang Tao.Control strategy for input-series output-paralleled DC-DC converters[J].Proceedings of the CSEE,2006,26(22):67-73(in Chinese).
• [18]杨双景.航天器ISOP直流变换器控制策略研究[J].航天器工程,2016,25(1):60-66.Yang Shuangjing.Research on control strategy for input-series outputparallel DC-DC converter of spacecraft[J].Spacecraft Engineering,2016,25(1):60-66(in Chinese).
• [19]Fan H,Li H.High-frequency transformer isolated bidirectional DCDC converter modules with high efficiency over wide load range for20 k VA solid-state transformer[J].IEEE Transactions on Power Electronics,2011,26(26):3599-3608.
• [20]赵彪,宋强,刘文华,等.用于柔性直流配电的高频链直流固态变压器[J].中国电机工程学报,2014,34(25):4295-4303.Zhao Biao,Song Qiang,Liu Wenhua,et al.High-frequency-link DC solid state transformers for flexible DC distribution[J].Proceedings of the CSEE,2014,34(25):4295-4303(in Chinese).
• [21]赵彪,于庆广,王立雯,等.用于电池储能系统并网的双向可拓展变流器及其分布式控制策略[J].中国电机工程学报,2011,31(S1):244-251.Zhao Biao,Yu Qingguang,Wang Liwen,et al.Bi-directional extensible converter and its distributed control strategy for battery energy storage grid-connected system[J].Proceedings of the CSEE,2011,31(S1):244-251(in Chinese).
• [22]程红,高巧梅,朱锦标,等.基于双重移相控制的双向全桥DC-DC变换器动态建模与最小回流功率控制[J].电工技术学报,2014,29(3):245-253.Cheng Hong,Gao Qiaomei,Zhu Jinbiao,et al.Dynamic modeling and minimum backflow power controlling of the bi-directional fullbridge DC-DC converters based on dual-phase-shifting control[J].Transactions of China Electrotechnical Society,2014,29(3):245-253(in Chinese).
• [23]许正平,李俊.双向全桥DC-DC变换器高效能控制研究与实现[J].电力系统保护与控制,2016,44(2):140-146.Xu Zhengping,Li Jun.Research and implementation of bidirectional full bridge DC-DC converter with high-efficiency control[J].Power System Protection and Control,2016,44(2):140-146(in Chinese).