输入串联输出串联型双向DC/DC变换器自适应均压控制策略研究
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摘要
多模块输入串联、输出串联(input-series output-series,ISOS)型双向DC/DC变换器尤其适用于如直流电网等输入、输出电压等级都较高的场合,模块间的输入/输出侧能否均压是制约其可靠运行的关键问题。提出了一种基于输入/输出侧电压双下垂的自适应均压控制策略。该控制策略利用电感电流补偿值与输入/输出电压之间的下垂特性实现了自适应均压控制,但下垂控制会带来不可避免的静差问题。补偿改进控制策略消除了静差并进一步提高了系统模块化程度,改进后,输入/输出侧均压效果和动态性能良好。利用小信号建模分析系统稳定性,通过根轨迹分析得到控制参数稳定范围,最后通过仿真和实验验证了策略的可行性。
Multi-module input-series output-series(ISOS) bidirectional DC/DC converter is especially suitable for occasions where input and output voltage levels are relatively high in DC grid. Whether the input and output side can achieve voltage sharing among modules is a key issue for reliable system operation. This paper proposes an adaptive voltage sharing control strategy based on dual-droop characteristics of input and output voltages. In this control strategy, adaptive voltage sharing control is achieved utilizing droop characteristics between inductor current compensation value and input/output voltage, but the droop control brings about an inevitable problem of static error. The improved compensation control strategy can not only eliminate static error but also further improve modularity degree of the system. After improvement, both input and output sides have good effects on voltage sharing and dynamic performance. By means of small signal modeling, system stability is analyzed and the stability range of control parameters is obtained with root locus analysis. At last, feasibility of the strategy is verified with simulation and experiment.
Multi-module input-series output-series(ISOS) bidirectional DC/DC converter is especially suitable for occasions where input and output voltage levels are relatively high in DC grid. Whether the input and output side can achieve voltage sharing among modules is a key issue for reliable system operation. This paper proposes an adaptive voltage sharing control strategy based on dual-droop characteristics of input and output voltages. In this control strategy, adaptive voltage sharing control is achieved utilizing droop characteristics between inductor current compensation value and input/output voltage, but the droop control brings about an inevitable problem of static error. The improved compensation control strategy can not only eliminate static error but also further improve modularity degree of the system. After improvement, both input and output sides have good effects on voltage sharing and dynamic performance. By means of small signal modeling, system stability is analyzed and the stability range of control parameters is obtained with root locus analysis. At last, feasibility of the strategy is verified with simulation and experiment.
引文
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[15]Giri R,Ayyanar R,Ledezma E.Input-series and output-series connected modular DC-DC converters with active input voltage and output voltage sharing[C]//IEEE Applied Power Electronics Conference and Exposition,Anaheim,CA,USA:IEEE,2004:1751-1754.
[16]陈武,曹远志,崔红芬,等.模块化输入串联输出串联高压直流组合系统分布式均压控制策略[J].电工技术学报,2015,30(3):187-195.Chen Wu,Cao Yuanzhi,Cui Hongfen,et al.Modular input-seriesoutput-series DC high voltage system with distributed voltage sharing control strategy[J].Transactions of China Electrotechnical Society,2015,30(3):187-195(in Chinese).
[17]郭洪玮.无无功环流的隔离型双向DC/DC变换器研制[D].北京:北京交通大学,2017.
[18]江晨,曾国宏,吴学智,等.双极性直流微网的分层控制策略[J].电网技术,2015,39(8):2217-2222.Jiang Chen,Zeng Guohong,Wu Xuezhi,et al.Hierarchical control strategy of bipolar-type DC microgrid[J].Power System Technology,2015,39(8):2217-2222(in Chinese).
[2]陶以彬,姚良忠,李官军,等.适用于直流电网的新型直流潮流控制器[J].电网技术,2016,40(11):3427-3432.Tao Yibin,Yao Liangzhong,Li Guanjun,et al.A novel DC power flow controller suitable for DC grid[J].Power System Technology,2016,40(11):3427-3432(in Chinese).
[3]杨越,张文亮,汤广福,等.双H桥型直流电网潮流控制器的控制策略[J].电网技术,2015,39(9):2505-2510.Yang Yue,Zhang Wenliang,Tang Guangfu,et al.Control strategy of dual H-bridge power flow controller for DC grids[J].Power System Technology,2015,39(9):2505-2510(in Chinese).
[4]杨晓峰,郑琼林,林智钦,等.用于直流电网的大容量DC/DC变换器研究综述[J].电网技术,2016,40(3):670-677.Yang Xiaofeng,Zheng Qionglin,Lin Zhiqin,et al.Survey of high-power DC/DC converter for HVDC grid application[J].Power System Technology,2016,40(3):670-677(in Chinese).
[5]魏晓光,王新颖,高冲,等.用于直流电网的高压大容量DC/DC变换器拓扑研究[J].中国电机工程学报,2014,34(S):218-224.Wei Xiaoguang,Wang Xinying,Gao Chong,et al.Topologies research of high voltage and high power DC/DC converters used in DC grids[J].Proceedings of the CSEE,2014,34(S):218-224(in Chinese).
[6]方天治,朱恒伟,阮新波.模块化输入串联输出串联逆变器系统的控制策略[J].电工技术学报,2015,30(20):85-92.Fang Tianzhi,Zhu Hengwei,Ruan Xinbo.Control strategy for modular input-series-output-series inverters system[J].Transactions of China Electrotechnical Society,2015,30(20):85-92(in Chinese).
[7]陈武,王广江,阮新波.基于输出电压上翘特性的串-并联组合变换器无互联均压控制策略[J].电工技术学报,2013,28(10):188-194.Chen Wu,Wang Guangjiang,Ruan Xinbo.Input voltage sharing control strategy for ISOP converter without interconnection based on positive output voltage gradient method[J].Transactions of China Electrotechnical Society,2013,28(10):188-194(in Chinese).
[8]庄凯,阮新波.输入串联输出并联逆变器的分布式均压控制策略[J].电工技术学报,2009,24(5):108-113.Zhuang Kai,Ruan Xinbo.Distributed voltage sharing control strategy for input-series output-parallel inverter[J].Transactions of China Electrotechnical Society,2009,24(5):108-113(in Chinese).
[9]D.Sha,Z.Guo,T.Luo,X.Liao.A general control strategy for input-series-output-series modular DC-DC converters[J].IEEE Transactions on Industrial Electronics,2014,29(7):3766-3775.
[10]Bottion A J B,Barbi I.Input-series and output-series connected modular output capacitor full-bridge PWM DC-DC converter[J].IEEE Transactions on Industrial Electronics,2015,62(10):6213-6221.
[11]Wu Chen,Xu Zhu,Guangjiang Wang,et al.A novel input voltage sharing control strategy for input-series output-parallel system with high reliability[C]//2014 IEEE Energy Conversion Congress and Exposition(ECCE).Pittsburgh,PA,USA:IEEE,2014:1207-1212.
[12]Sha D,Deng K,Liao X.Duty cycle exchanging control for input-series-output-series connected two PS-FB DC-DC converters[J].IEEE Transactions on Power Electronics,2012,27(3):1490-1501.
[13]Giri R,Choudhary V,Ayyanar R,et al.Common-duty-ratio control of input-series connected modular DC-DC converters with active input voltage and load-current sharing[J].IEEE Transactions on Industry Applications,2006,42(4):1101-1111.
[14]Giri R,Ayyanar R,Mohan N.Common duty ratio control of input series connected modular DC-DC converters with active input voltage and load current sharing[C]//IEEE Applied Power Electronics Conference and Exposition.Miami Beach,FL,USA:IEEE,2003:322-326.
[15]Giri R,Ayyanar R,Ledezma E.Input-series and output-series connected modular DC-DC converters with active input voltage and output voltage sharing[C]//IEEE Applied Power Electronics Conference and Exposition,Anaheim,CA,USA:IEEE,2004:1751-1754.
[16]陈武,曹远志,崔红芬,等.模块化输入串联输出串联高压直流组合系统分布式均压控制策略[J].电工技术学报,2015,30(3):187-195.Chen Wu,Cao Yuanzhi,Cui Hongfen,et al.Modular input-seriesoutput-series DC high voltage system with distributed voltage sharing control strategy[J].Transactions of China Electrotechnical Society,2015,30(3):187-195(in Chinese).
[17]郭洪玮.无无功环流的隔离型双向DC/DC变换器研制[D].北京:北京交通大学,2017.
[18]江晨,曾国宏,吴学智,等.双极性直流微网的分层控制策略[J].电网技术,2015,39(8):2217-2222.Jiang Chen,Zeng Guohong,Wu Xuezhi,et al.Hierarchical control strategy of bipolar-type DC microgrid[J].Power System Technology,2015,39(8):2217-2222(in Chinese).