基于虚拟谐波阻抗的孤岛微电网谐波功率均分控制策略
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摘要
微电网孤岛运行存在各个发电单元均分负载(包括非线性负载)的问题。为此,提出一种孤岛微电网谐波功率均分控制策略,该新型控制策略采用负虚拟谐波阻抗来补偿馈线阻抗对谐波功率均分的影响,即改变在谐波频率处的等效馈线阻抗,使得不同发电单元至负载的不同馈线阻抗对非线性负载分配的影响最小化;在此基础上,提出一种新的Zh-H下垂控制方式,可以自适应地调整虚拟谐波阻抗值。新型控制方案的优势在于可以实现非线性负载均分的同时,不影响线性负载均分,对负载侧电压质量也没有不利影响。最后,利用小功率微网试验平台验证了该方案的有效性。
Each distributed generation unit in an islanded micro-grid has the problem to achieve a good load sharing, especially for the nonlinear load. Aiming at the problem, a new control scheme for harmonic power sharing based on virtual harmonic impedance in an islanded micro-grid was proposed in this paper. The new control strategy used negative virtual harmonic impedance to compensate the effect of line impedance on harmonic power delivery. The controller changed the harmonic equivalent feeder line impedance to minimize the influence to nonlinear load sharing, which caused by mismatched line impedance between the nonlinear load and the different distributed generations. Furthermore, a new droop method, named as Zh-H droop, was proposed to estimate the virtual harmonic impedance value adaptively. The proposed control method can realize the sharing of nonlinear load without affecting the voltage quality at the load bus, and have no influence in linear load sharing. Finally, the validity of the proposed control scheme was verified by using a small power micro-grid experimental platform.
Each distributed generation unit in an islanded micro-grid has the problem to achieve a good load sharing, especially for the nonlinear load. Aiming at the problem, a new control scheme for harmonic power sharing based on virtual harmonic impedance in an islanded micro-grid was proposed in this paper. The new control strategy used negative virtual harmonic impedance to compensate the effect of line impedance on harmonic power delivery. The controller changed the harmonic equivalent feeder line impedance to minimize the influence to nonlinear load sharing, which caused by mismatched line impedance between the nonlinear load and the different distributed generations. Furthermore, a new droop method, named as Zh-H droop, was proposed to estimate the virtual harmonic impedance value adaptively. The proposed control method can realize the sharing of nonlinear load without affecting the voltage quality at the load bus, and have no influence in linear load sharing. Finally, the validity of the proposed control scheme was verified by using a small power micro-grid experimental platform.
引文
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[2]王文静,王斯成.我国分布式光伏发电的现状与展望[J].中国科学院院刊,2016,31(2):165-172.WANG Wen-jing,WANG Si-cheng.Status and prospect of Chinese distributed photovoltaic power generation system[J].Bulletin of the Chinese Academy of Sciences,2016,31(2):165-172.
[3]梅生伟,王莹莹.输电网—配电网—微电网三级电网规划的若干基础问题[J].电力科学与技术学报,2009,24(4):3-11.MEI Sheng-wei,WANG Ying-ying.Several basic problems of three-level power network planning of transmission network-distribution network-microgrid[J].Journal of Electric Power Science and Technology,2009,24(4):3-11.
[4]武志刚,程鲁文,李玮,等.智能微网及其可靠并网研究[J].电力科学与技术学报,2012,27(4):22-27.WU Zhi-gang,CHENG Lu-wen,LI Wei,et al.Study on smart microgrid and reliable grid-connected microgrid[J].Journal of Electric Power Science and Technology,2012,27(4):22-27.
[5]刘文洵,杨洪朝,汤燕.分布式可再生能源接入微网系统的随机多目标经济调度[J].电力科学与技术学报,2014,29(3):52-58.LIU Wen-xun,YANG Hong-zhao,TANG Yan.Random multi-objective economic dispatch for distributed renewable energy access to micro-grid system[J].Journal of Electric Power Science and Technology,2014,29(3):52-58.
[6]马艺玮,杨苹,王月武,等.微电网典型特征及关键技术[J].电力系统自动化,2015,39(8):168-175.MA Yi-wei,YANG Ping,WANG Yue-wu,et al.Typical characteristics and key technologies of microgrid[J].Automation of Electric Power Systems,2015,39(8):168-175.
[7]王成山,武震,李鹏.微电网关键技术研究[J].电工技术学报,2014,29(2):1-12.WANG Cheng-shan,WU Zhen,LI Peng.Research on key technologies of microgrid[J].Transactions of China Electrotechnical Society,2014,29(2):1-12.
[8]雷颖,范伟强,王弋飞,等.基于背靠背VSC的微网并网技术研究[J].电力电容器与无功补偿,2016,37(2):84-88.LEI Ying,FAN Wei-qiang,WANG Yi-fei,et al.Study on the microgrid interconnection technology based on back-to-back VSC[J].Power Capacitor&Reactive Power Compensation,2016,37(2):84-88.
[9]赵杰,王硕,沈大力,等.基于多种分布式电源的微电网控制策略与仿真[J].中国电力,2013,46(7):105-110.ZHAO Jie,WANG Shuo,SHEN Da-li,et al.Control and Simulation of a microgrid with different types of distributed generators[J].Electric Power,2013,46(7):105-110.
[10]张平,石健将,李荣贵,等.低压微网逆变器的虚拟负阻抗控制策略[J].中国电机工程学报,2014,34(12):1 844-1 851.ZHANG Ping,SHI Jian-jiang,LI Rong-gui,et al.A control strategy of virtual negative impedance for inverters in low-voltage microgrid[J].Proceedings of the CSEE,2014,34(12):1 844-1 851.
[11]朱永兴.虚拟负阻抗在微网下垂控制中的应用[J].电力系统及其自动化学报,2014,26(3):66-71.ZHU Yong xing.Application of virtual negative resistance on microgrid droop control[J].Proceedings of the CSU-EPSA,2014,26(3):66-71.
[12]Tuladhar A,Jin H,Unger T,et al.Parallel operation of single phase inverter modules with no control interconnections[C].IEEE Applied Power Electronics Conference and Exposition,Atlanta,Georgia,1997.
[13]Guerrero M J,Hang L,Uceda J.Control of distributed uninterruptible power supply systems[J].IEEE Transactions on Industry Electronics,2008,55(2):2 845-2 859.
[14]Lee L T,Cheng T P.Design of a new cooperative harmonic filtering strategy for distributed generation interface converters in an islanding network[J].IEEE Transactions on Power Electronics,2007,2(5):1 919-1 927.
[15]Savaghebi M,Jalilian A.A new control strategy for distributed generation interface converters to compensate for microgrid harmonics[C].IEEE International Symposium on Power Electronics Electrical Drives Automation and Motion,Pisa,Italy,2011.
[16]Guerrero M J,Matas J,García L,et al.Wireless-control strategy for parallel operation of distributed-generation inverters[J].IEEE Transactions on Industry Electronics,2006,53(5):1 461-1 470.
[17]Savaghebi M,Guerrero M J,Jalilian A,Vasquez J C,and Lee T.Hierarchical Control Scheme for Voltage Harmonics Compensation in An Islanded Droop-controlled Microgrid[C].IEEE 9th International Conference on Power Electronics and Drive Systems,Singapore,2011.
[18]Wang X,Blaabjerg F,Chen Z.Autonomous control of inverterinterfaced distributed generation units for harmonic current filtering and resonance damping in an islanded microgrid[J].IEEE Transactions on Industry Applications,2014,50(1):452-461.
[19]He J,Li W Y,Guerrero M J,et al.An islanding microgrid power sharing approach using enhanced virtual impedance control scheme[J].IEEE Transactions on Power Electronics,2013,28(11):5 257-5 282.
[20]Savaghebi M,Jalilian A,Vasquez C J,et al.Secondary control for voltage quality enhancement in microgrids[J].IEEE Transactions on Smart Grid,2012,3(4):1 893-1 902.
[21]Vandoorn T,Meersman B,Kooning J D,et al.Controllable harmonic current sharing in islanded microgrids:DG units with programmable resistive behavior toward harmonics[J].IEEE Transactions on Power Delivery,2012,27(2):831-841.
[22]赵清林,郭小强,邬伟扬.单相逆变器并网控制技术研究[J].中国电机工程学报,2007,27(16):60-64.ZHAO Qing-lin,GUO Xiao-qiang,WU Wei-yang.Research on control strategy for single-phase gridconnected inverter[J].Proceedings of the CSEE,2007,27(16):60-64.