光储联合运行直流微电网控制策略
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摘要
为了更好地解决光伏系统的并网问题,提出了一种基于光储联合运行的直流微电网运行控制策略。首先构建了光储联合运行的直流微电网系统结构,该系统由光伏系统、储能系统、非隔离型DC-DC变换器以及高频隔离型DC-DC变换器组成。在划分系统6种工作模式的基础上,该策略可以在保证直流母线电压稳定的前提下,通过实时检测并对比光伏输出功率与负荷需求功率来确定储能系统的工作状态,即采用储能系统来作为直流微电网的松弛节点,从而保证直流微电网系统的稳定运行。最后,基于PSCAD/EMTDC仿真软件验证了该系统以及运行控制策略的有效性,针对核心器件高频隔离型DC-DC变换器进行了样机实验研究,实验结果证明了理论分析的正确性。
In order to solve the problem of photovoltaic(PV)grid-connection,the paper proposes a kind of control strategy for DC micro-grid operation based on PV and energy storage systems.It firstly constructs structure of the DC micro-grid system based on unified operation of PV and energy storage which consists of the PV system,the energy storage system,the non-isolated DC-DC converter and the high-frequency isolated DC-DC converter.By dividing six kinds of operation modes for the system and in the premise of ensuring stable DC busbar voltage,this strategy can determine operating state of the energy storage system by detecting and comparing PV output power and load demand power in real time,which is to consider the energy storage system as the relaxation node of the DC micro-grid so as to ensure stable operation of the system.Finally,it verifies effectiveness of this system and the control strategy by PSCAD/EMTDC simulation.Meanwhile,it studies prototype of the high-frequency isolated DC-DC converter,and the experimental results prove accuracy of theoretical analysis.
In order to solve the problem of photovoltaic(PV)grid-connection,the paper proposes a kind of control strategy for DC micro-grid operation based on PV and energy storage systems.It firstly constructs structure of the DC micro-grid system based on unified operation of PV and energy storage which consists of the PV system,the energy storage system,the non-isolated DC-DC converter and the high-frequency isolated DC-DC converter.By dividing six kinds of operation modes for the system and in the premise of ensuring stable DC busbar voltage,this strategy can determine operating state of the energy storage system by detecting and comparing PV output power and load demand power in real time,which is to consider the energy storage system as the relaxation node of the DC micro-grid so as to ensure stable operation of the system.Finally,it verifies effectiveness of this system and the control strategy by PSCAD/EMTDC simulation.Meanwhile,it studies prototype of the high-frequency isolated DC-DC converter,and the experimental results prove accuracy of theoretical analysis.
引文
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[20]赵彪,于庆广,孙伟欣.双重移相控制的双向全桥DC-DC变换器及其功率回流特性分析[J].中国电机工程学报,2012,32(12):43-50.ZHAO Biao,YU Qingguang,SUN Weixin.Bi-directional full-bridge DC-DC converters with dual-phase-shifting control and its backflow power characteristic analysis[J].Proceedings of the CSEE,2012,32(12):43-50.
[2]SAEEDIFARD M,GRAOVAC M,DIAS R F,et al.DC power systems:challenges and opportunities[C]//IEEE PES General Meeting.Minneapolis,MN:IEEE,2010:1-7.
[3]DASTGEER F,KALAM A.Efficiency comparison of DC and AC distribution systems for distributed generation[C]//Power Engineering Conference,2009.AUPEC 2009.Australasian Universities.Adelaide,SA:IEEE,2009:1-5.
[4]宋强,赵彪,刘文华,等.智能直流配电网研究综述[J].中国电机工程学报,2013,33(25):9-19.SONG Qiang,ZHAO Biao,LIU Wenhua,et al.AN overview of research on smart DC distribution power network[J].Proceedings of the CSEE,2013,33(25):9-19.
[5]江道灼,郑欢.直流配电网研究现状与展望[J].电力系统自动化,2012,36(8):98-104.JIANG Daozhuo,ZHENG Huan.Research status and developing prospect of DC distribution network[J].Automation of Electric Power Systems,2012,36(8):98-104.
[6]张杰,高腾,赵威,等.直流微网系统能量管理控制技术研究[J].电力系统及其自动化,2014,36(4):50-53.ZHANG Jie,GAO Teng,ZHAO Wei,et al.Research on the energy management control technology of DC micro-grid[J].Power System and Automation,2014,36(4):50-53.
[7]XU She,SRDJAN L,HUANG A Q.DC zonal micro-grid architecture and control[C]//IECON2010-36th Anual Conference on IEEE Industrial Electronics Society.Glendale,AZ,USA:IEEE,2010:2988-2993.
[8]杨永恒,周克亮.光伏电池建模及MPPT控制策略[J].电工技术学报,2011,26(1):229-234.YANG Yongheng,ZHOU Keliang.Photovoltaic cell modeling and MPPT control strategies[J].Transactions of China Electrotechnical Society,2011,26(1):229-234.
[9]汤海宁,朱守让,王伟.光伏电站并网有功功率控制策略的设计与实现[J].电网与清洁能源,2015,31(8):75-79.TANG Haining,ZHU Shourang,WANG Wei.Design of grid-connected photovoltaic power station active power control strategy[J].Power System and Clean Energy,2015,31(8):75-79.
[10]施泉生,于文姝,谢品杰.能源互联网背景下分布式光伏发电的经济效益研究[J].电网与清洁能源,2016,32(1):100-106.SHI Quansheng,YU Wenshu,XIE Pinjie.Economic benefit analysis of distributed photovoltaic under the energy internet background[J].Power System and Clean Energy,2016,32(1):100-106.
[11]刘家赢,韩肖清,王磊,等.直流微电网运行策略[J].电网技术,2014,38(9):2356-2361.LIU Jiaying,HAN Xiaoqing,WANG Lei,et al.Operation and control strategy of DC microgrid[J].Power System Technology,2014,38(9):2356-2361.
[12]王毅,张丽荣,李和明,等.风电直流微网的电压分层协调控制[J].中国电机工程学报,2013,33(44):16-24.WANG Yi,ZHANG Lirong,LI Heming,et al.Hierarchical coordinated control of wind turbine-based DC microgrid[J].Proceedings of the CSEE,2013,33(44):16-24.
[13]冯建云,王碧箐,牛瑞根,等.直流微网中混合储能系统的模式分析与控制[J].陕西电力,2014,42(10):13-17.FENG Jianyun,WANG Biqing,NIU Ruigen,et al.Mode analysis and control of hybrid energy storage system in DC micro-grid[J].Shaanxi Electric Power,2014,42(10):13-17.
[14]张惠生,赵兴勇,王凯武,等.基于风光互补微电网的复合储能控制策略[J].广东电力,2017,30(2):48-53,96.ZHANG Huisheng,ZHAO Xingyong,WANG Kaiwu,et al.Control strategy for hybrid energy storage based on wind/photovoltaic complementary micro-grid system[J].Guangdong Electric Power,2017,30(2):48-53,96.
[15]杨李星,郝思鹏,严晓杰,等.基于混合储能的直流配电网改进电压分区控制策略[J].浙江电力,2017,36(6):20-25.YANG Lixing,HAO Sipeng,YAN Xiaojie,et al.An Improved control strategy for voltage partitioning of DC power distribution network based on hybrid energy storage[J].Zhejiang Electric Power,2017,36(6):20-25.
[16]吴峰,王鹏翔.储能位置对多风电场电网平稳控制的影响研究[J].电网与清洁能源,2017,33(1):88-94,102.WU Feng,WANG Pengxiang.Research on the influence on placidity control of power grid integrated with multi-wind farms by the location of energy storage[J].Power System and Clean Energy,2017,33(1):88-94,102.
[17]陆秋瑜,胡伟,郑乐,等.多时间尺度的电池储能系统建模及分析应用[J].中国电机工程学报,2013,86(33):86-93.LU Qiuyu,HU Wei,ZHENG Le,et al.Modeling and analysis of battery energy storage systems in multi-time scales application[J].Proceedings of the CSEE,2013,86(33):86-93.
[18]王成山,高菲,李鹏,等.低压微电网控制策略研究[J].中国电机工程学报,2012,32(25):2-8.WANG Chengshan,GAO Fei,LI Peng,et al.Control strategy research on low voltage microgrid[J].Proceedings of the CSEE,2012,32(25):2-8.
[19]孙谦浩,宋强,赵彪,等.用于直流配电网的直流变压器参数计算与分析[J].南方电网技术,2016,4(4):70-77.SUN Qianhao,SONG Qiang,ZHAO Biao,et al.Parameter calculation and analysis of DC transformer used in DC distribution network[J].South Power System Technology,2016,4(4):70-77.
[20]赵彪,于庆广,孙伟欣.双重移相控制的双向全桥DC-DC变换器及其功率回流特性分析[J].中国电机工程学报,2012,32(12):43-50.ZHAO Biao,YU Qingguang,SUN Weixin.Bi-directional full-bridge DC-DC converters with dual-phase-shifting control and its backflow power characteristic analysis[J].Proceedings of the CSEE,2012,32(12):43-50.