任碧莹;孙凯歌;马保慧;孙向东;

• 1:西安理工大学电气工程系
• 2:大型电气传动系统与装备技术国家重点实验室

摘要(Abstract)：

孤岛微电网中非线性负载带来了大量谐波,若各并联逆变器连接至公共交流母线的馈线阻抗与其额定容量失配,将使得谐波电流不能在各逆变器间均匀分配。固定虚拟谐波阻抗方法可以有效地提高谐波电流分配精度,但会影响公共交流母线电压质量。因此,提出了一种自动调节虚拟谐波阻抗实现谐波均流的控制策略。各逆变器根据其谐波电流的有效值构造实时变化的虚拟谐波阻抗,建立起谐波电流与虚拟谐波阻抗的自调整关系,重塑系统在谐波域的输出阻抗以匹配馈线阻抗,动态调整谐波电流分配,有效地提高了谐波均流精度,且兼顾了公共交流母线的电压质量,无需检测线路阻抗信息。仿真和实验结果验证了所提策略的可行性。

关键词(KeyWords)： 非线性负载;固定虚拟谐波阻抗;自适应虚拟谐波阻抗;谐波电流

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51477139);; 大型电气传动系统与装备技术国家重点实验室开放基金(SKLLDJ012016007);; 陕西省自然科学基金(2017JM5075)~~

作者(Author): 任碧莹;孙凯歌;马保慧;孙向东;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.2788

参考文献(References)：

• [1]Han Y,Shen P,Zhao X,et al.An enhanced power sharing scheme for voltage unbalance and harmonics compensation in an islanded ACmicrogrid[J].IEEE Transactions on Energy Conversion,2016,31(3):1037-1050.
• [2]吕志鹏,吴鸣,黄红,等.一种具有网络自适应能力的分布式电源改进下垂控制策略[J].电网技术,2018,42(9):2948-2957.LüZhipeng,Wu Ming,Huang Hong,et al.An improved droop control with network self-adaptability for distributed generation[J].Power System Technology,2018,42(9):2948-2957(in Chinese).
• [3]孙孝峰,杨雅麟,赵巍,等.微电网逆变器自适应下垂控制策略[J].电网技术,2014,38(9):2386-2391.Sun Xiaofeng,Yang Yalin,Zhao Wei,et al.An adaptive droop control method for inverters in microgrid[J].Power System Technology,2014,38(9):2386-2391(in Chinese).
• [4]孙孝峰,郝彦从,赵巍,等.孤岛微电网无通信功率均分和电压恢复研究[J].电工技术学报,2016,31(1):55-61.Sun Xiaofeng,Hao Yancong,Zhao Wei,et al.Research of power sharing and voltage restoration without communication for islanded microgrid[J].Transactions of China Electrotechnical Society,2016,31(1):55-61(in Chinese).
• [5]金国彬,罗安,陈燕东,等.基于P-V下垂系数修正的并联逆变器输出功率成比例分配实现[J].电工技术学报,2016,31(2):112-120.Jin Guobin,Luo An,Chen Yandong,et al.Proportional load sharing for parallel inverter systems based on modified P-V droop coefficient[J].Transactions of China Electrotechnical Society,2016,31(2):112-120(in Chinese).
• [6]周乐明,罗安,陈燕东,等.一种低延时鲁棒功率下垂控制方法[J].电工技术学报,2016,31(11):1-12.Zhou Leming,Luo An,Chen Yandong,et al.A low delay robust droop control method[J].Transactions of China Electrotechnical Society,2016,31(11):1-12(in Chinese).
• [7]任碧莹,赵欣荣,孙向东,等.不平衡负载下基于改进下垂控制策略的组合式三相逆变控制[J].电网技术,2016,40(4):1163-1168.Ren Biying,Zhao Xinrong,Sun Xiangdong,et al.Improved droop control based three-phase combined inverters for unbalanced load[J].Power System Technology,2016,40(4):1163-1168(in Chinese).
• [8]De D,Ramanarayanan V.Decentralized parallel operation of inverters sharing unbalanced and nonlinear loads[J].IEEE Transactions on Power Electronics,2010,25(12):3015-3025.
• [9]Zhong Q C.Harmonic droop controller to reduce the voltage harmonics of inverters[J].IEEE Transaction on Industrial Electronics,2013,60(3):936-945.
• [10]Vandoorn T,Meersman B,Kooning J D.Controllable harmonic current sharing in islanded microgrids:DG units with programmable resistive behavior toward harmonics[J].IEEE Transaction on Power Delivery,2012,27(2):831-839.
• [11]He J W,Li Y W,Guerrero J M.An islanding microgrid power sharing approach using enhanced virtual impedance control scheme[J].IEEETransactions on Power Electronics,2013,28(11):5272-5281.
• [12]吕志鹏,盛万兴,蒋雯倩,等.具备电压稳定和环流抑制能力的分频下垂控制器[J].中国电机工程学报,2013,33(36):1-8.LüZhipeng,Sheng Wanxing,Jiang Wenqian,et al.Frequency dividing droop controllers with the function of voltage stabilization and circulation control[J].Proceedings of the CSEE,2013,33(36):1-8(in Chinese).
• [13]Sreekumar P,Khadkikar V.A new virtual harmonic impedance scheme for harmonic power sharing in an islanded microgrid[J].IEEETransactions on Power Delivery,2016,31(3):936-945.
• [14]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):1844-1852.Zhang Peng,Shi Jianjiang,Li Ronggui,et al.A control strategy of‘virtual negative’impedance for inverters in low-voltage microgrid[J].Proceedings of the CSEE,2014,34(12):1844-1852(in Chinese).
• [15]Zhou J G,Kim S,Zhang H,et al.Consensus-based distributed control for accurate reactive,harmonic and imbalance power sharing in microgrids[J].IEEE Transaction on Smart Grid,2018,9(4):2453-2467.
• [16]He J W,Li Y W,Blaabjerg F.An enhanced islanding microgrid reactive power,impedance power,and harmonic power sharing scheme[J].IEEE Transactions on Power Electronics,2015,30(6):3389-3401.
• [17]陈燕东,罗安,龙际根,等.阻性逆变器并联环流分析及鲁棒下垂多环控制[J].中国电机工程学报,2013,33(18):18-29.Chen Yandong,Luo An,Long Jigen,et al.Circulating current analysis and robust droop multiple loop control method for parallel inverters using resistive output impedance[J].Proceedings of the CSEE,2013,33(18):18-29(in Chinese).
• [18]Vandoorn T,Meersman B,De Kooning J,et al.Controllable harmonic current sharing in islanded microgrids:DG units with programmable resistive behavior toward harmonics[J].IEEE Transactions on Power Delivery,2012,2(27):831-841.
• [19]林燎源,林钊,刘伟,等.基于阻性下垂的逆变器无线并联均流控制[J].电工技术学报,2016,31(8):43-50.Lin Liaoyuan,Lin Zhao,Liu Wei,et al.Wireless current sharing scheme for parallel operation of inverters using resistive output impedance[J].Transactions of China Electrotechnical Society,2016,31(8):43-50(in Chinese).