光伏直流升压系统中级联DC/DC变流器的均流/均压控制策略

陈波; 蔡礼; 谢凡; 王晓晨; 邱日强; 涂睿

doi:10.19912/j.0254-0096.tynxb.2022-0755

PDF(3388 KB)

太阳能学报 ›› 2023, Vol. 44 ›› Issue (9) : 169-179. DOI: 10.19912/j.0254-0096.tynxb.2022-0755

光伏直流升压系统中级联DC/DC变流器的均流/均压控制策略

陈波¹, 蔡礼¹, 谢凡², 王晓晨³, 邱日强¹, 涂睿¹

作者信息 +

CURRENT-SHARING/VOLTAGE-SHARING CONTROL STRATEGY OF CASCADED DC/DC CONVERTER FOR PHOTOVOLTAIC DC BOOST SYSTEM

Chen Bo¹, Cai Li¹, Xie Fan², Wang Xiaochen³, Qiu Riqiang¹, Tu Rui¹

Author information +

文章历史 +

摘要

输入并联输出串联级联DC/DC变流器可减小开关器件承受的电流/电压应力,适用于低电压输入高电压输出的光伏直流升压系统。为了保证级联变流器的稳定工作,必须确保各模块的输出电压均衡。分析统一占空比控制策略的缺点,提出采用均流型MPPT控制策略实现输出均压和光伏模块的最大功率跟踪,针对均流型MPPT控制策略在光照强度发生变化时的暂态特性的不足提出在均流环的基础上叠加输出电压环的均流均压型MPPT控制策略,以改善系统的动态均压能力。并提出光伏直流升压系统中输入并联输出串联级联DC/DC变流器的模块化设计结构。仿真结果验证了该方法的有效性。

Abstract

The input parallel output series cascaded DC/DC converter can reduce the current/voltage stress on the switching device, and is suitable for the photovoltaic DC boost system with low voltage input and high voltage output. In order to ensure the stable operation of the cascaded converters, it is necessary to ensure that the output voltages of each module are balanced. The shortcomings of the unified duty cycle control strategy are analyzed, and a current-sharing MPPT control strategy is proposed to achieve output voltage equalization and the maximum power tracking of photovoltaic modules. In view of the shortcoming of the transient characteristics of the current-sharing MPPT control strategy when the light intensity changes. A current sharing and voltage sharing MPPT control strategy is proposed, which superimposes the output voltage loop on the basis of the current sharing loop, so as to improve the dynamic voltage sharing capability of the system. And a modular design structure of the input-parallel output-series cascaded DC/DC converter in the photovoltaic DC boost system is proposed. The simulation results verify the effectiveness of the method.

导出引用

陈波, 蔡礼, 谢凡, 王晓晨, 邱日强, 涂睿. 光伏直流升压系统中级联DC/DC变流器的均流/均压控制策略[J]. 太阳能学报. 2023, 44(9): 169-179 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0755

Chen Bo, Cai Li, Xie Fan, Wang Xiaochen, Qiu Riqiang, Tu Rui. CURRENT-SHARING/VOLTAGE-SHARING CONTROL STRATEGY OF CASCADED DC/DC CONVERTER FOR PHOTOVOLTAIC DC BOOST SYSTEM[J]. Acta Energiae Solaris Sinica. 2023, 44(9): 169-179 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0755

中图分类号： TM715

参考文献

[1] 曹文远, 韩民晓, 谢文强, 等. 交直流配电网逆变器并联控制技术研究现状分析[J]. 电工技术学报, 2019, 34(20): 4226-4241.
CAO W Y, HAN M X, XIE W Q, et al.Analysis on research status of parallel inverter control technologies for AC/DC distribution network[J]. Transactions of China Electrotechnical Society, 2019, 34(20): 4226-4241.
[2] 宁光富, 陈武, 曹小鹏, 等. 适用于模块化级联光伏发电直流并网系统的均压策略[J]. 电力系统自动化, 2016, 40(19): 66-72.
NING G F, CHEN W, CAO X P, et al.Voltage balancing strategy for DC grid-connected photovoltaic power generation systems with modular cascaded structure[J]. Automation of electric power systems, 2016, 40(19): 66-72.
[3] 陈波. 光伏直流汇集系统中升压变流器的均压控制策略[D]. 北京: 华北电力大学, 2019.
CHEN B.Voltage equalization control strategy of boost converter in photovoltaic DC collection system[D]. Beijing: North China Electric Power University, 2019.
[4] 鞠昌斌, 王环, 冯伟, 等. 应用于柔性直流输电网的光伏直流并网变流器研究[J]. 可再生能源, 2014, 32(9): 1274-1280.
JU C B, WANG H, FENG W, et al.Research of photovoltaic DC grid-connected converter applied in flexible DC grid[J]. Renewable energy resources, 2014, 32(9): 1274-1280.
[5] ANDREASSON M, DIMAROGONAS D V, SANDBERG H, et al.Distributed controllers for multiterminal HVDC transmission systems[J]. IEEE transactions on control of network systems, 2017, 4(3): 564-574.
[6] MANIAS S N, KOSTAKIS G.Modular DC-DC convertor for high-output voltage applications[J]. IEE proceeding B electric power applications, 1993, 140(2): 97-102.
[7] 陈武, 阮新波, 颜红. DC/DC多模块串并联组合系统控制策略[J]. 电工技术学报, 2009, 24(7): 93-102.
CHEN W, RUAN X B, YAN H.Control strategy for DC/DC multiple modules series-parallel combined systems[J]. Transactions of China Electrotechnical Society, 2009, 24(7): 93-102.
[8] XU Q S, ZHAO W R, BIAN H H, et al.Operation optimization for performance improvement of PV/converter systems[C]//IEEE Asia-Pacific Power and Energy Engineering Conference. Chengdu, China: IEEE, 2010: 1-4.
[9] 张容荣, 阮新波, 陈武. 输入并联输出串联变换器系统的控制策略[J]. 电工技术学报, 2008, 23(8): 86-93.
ZHANG R R, RUAN X B, CHEN W.Control strategy for input-parallel output-series converter systems[J]. Transactions of China Electrotechnical Society, 2008, 23(8): 86-93.
[10] 李广林, 樊艳芳, 王一波, 等. IPOS型光伏直流升压外送系统控制策略研究[J]. 太阳能学报, 2021, 42(8): 166-176.
LI G L, FAN Y F, WANG Y B, et al.Research on control strategy of IPOS-type photovoltaic DC boost outbound system[J]. Acta energiae solaris sinica, 2021, 42(8): 166-176.
[11] PRASANNA U R, RATHORE A K.Analysis and design of zero-voltage-switching current-fed isolated full-bridge DC/DC converter[C]//2011 IEEE Ninth International Conference on Power Electronics and Drive Systems. Singapore, Singapore, 2012: 239-245.
[12] PRASANNA U R,AKSHAY K R.Extended range ZVS active-clamped current-fed full-bridge isolated DC/DC converter for fuel cell applications:analysis, design, and experimental results[J]. IEEE transactions on industrial electronics, 2013, 60(7): 2661-2672.
[13] 姜雪松. 隔离升压全桥DC-DC变换器拓扑理论和控制技术研究[D]. 北京: 中国科学院研究生院(电工研究所), 2006.
JIANG X S.Research on the topology theory and control technology of isolated boost full-bridge DC-DC converter [D]. Beijing: Graduate School of Chinese Academy of Sciences (Institute of Electrical Engineering), 2006.
[14] HUYNH D C, DUNNIGAN M W.Development and comparison of an improved incremental conductance algorithm for tracking the MPP of a solar PV panel[J]. IEEE transactions on sustainable energy, 2016, 7(4): 1421-1429.
[15] 周东宝, 陈渊睿. 基于改进型变步长电导增量法的最大功率点跟踪策略[J]. 电网技术, 2015, 39(6): 1491-1498.
ZHOU D B, CHEN Y R.Maximum power point tracking strategy based on modified variable step-size incremental conductance algorithm[J]. Power system technology, 2015, 39(6): 1491-1498.
[16] 易伟. 光伏模块化直流升压汇集系统及控制策略研究[D]. 沈阳: 沈阳工业大学, 2019.
YI W.Research on PV modular DC boost collection system and control strategy[D]. Shenyang: Shenyang University of Technology, 2019.
[17] 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, (16): 86-91.
MA X J, NIU J H, KANG Y.Study on input-series-output-parallel converter with voltage sharing between input-capacitor[J]. Proceedings of the CSEE, 2006, 26(16): 86-91.
[18] 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.
[19] 鞠昌斌, 冯伟, 王环, 等. 基于Boost隔离升压拓扑的光伏直流并网变流器的设计与实现[J]. 太阳能学报, 2016, 37(3): 752-758.
JU C B, FENG W, WANG H, et al.Design and implement of photovoltaic DC grid-connected converter based on Boost isolated full-bridye[J]. Acta energiae solaris sinica, 2016, 37(3): 752-758.
[20] 朱守让, 王伟, 汤海宁, 等. 大型光伏电站巨量控制点操作模式设计与应用[J]. 电力系统自动化, 2014, 38(14): 36-41, 48.
ZHU S R, WANG W, TANG H N, et al.Control mode design of massive operating points in large-scale photovoltaic power plant and its application[J]. Automation of electric power systems, 2014, 38(14): 36-41,48.