王仰铭;孙丹;年珩;王霄鹤;

• 1:浙江大学电气工程学院
• 2:浙江省深远海风电技术研究重点实验室

摘要(Abstract)：

虚拟同步机控制策略因其能为电网提供惯性和频率支撑的特性被广泛应用于新能源发电系统并网接口,但其在不平衡电网下的运行能力不足。为提高虚拟同步机在不平衡电网下的自同步并网能力和输出功率的电能质量,文章提出一种不平衡电网下基于拓展功率的自同步虚拟同步机控制策略。首先研究拓展功率和传统功率的关系,并提出一种适用于虚拟同步机控制的拓展功率理论。然后分析将拓展功率理论应用于自同步虚拟同步机策略的可行性,并研究一种拓展功率谐振控制方法,使虚拟同步机在不平衡电网中可以实现对传统和拓展功率的精确控制。在此基础上,提出一种基于拓展功率的自同步虚拟同步机控制策略,通过选择不同的功率组合作为控制变量,可实现不平衡电网下虚拟同步机的精准自同步并网和3种不同的功率控制模式。实验结果验证了所提控制策略的有效性。

关键词(KeyWords)： 拓展功率;自同步策略;不平衡电网;虚拟同步机

Abstract:

Keywords:

基金项目(Foundation): 浙江省自然科学基金项目(LZ18E070001);; 青海省科技计划重大科技专项(2018-GX-A6)~~

作者(Author): 王仰铭;孙丹;年珩;王霄鹤;

Email:

DOI: 10.13335/j.1000-3673.pst.2020.0477

参考文献(References)：

• [1] Nejabatkhah F,Li Y,Tian H.Power quality control of smart hybrid AC/DC microgrids:an overview[J]. IEEE Access, 2019(7):52295-52318.
• [2]周一雄，秦文萍，王祺，等．双移相加变频控制的隔离型双向AC/DC变换器控制策略[J]．电网技术，2019,43(5):1826-1833.Zhou Yixiong,Qin Wenping,Wang Qi,et al.A dual-phase-shift plus variable frequency control strategy of isolated bidirectional AC/DC converter[J].Power System Technology,2019,43(5):1826-1833(in Chinese).
• [3] Blasko V,Kaura V.A new mathematical model and control of a three-phase AC-DC voltage source converter[J].IEEE Transactions on Power Electronics,1997,12(1):116-123.
• [4] Zhong Q,Virtual synchronous machines:a unified interface for grid integration[J].IEEE Power Electronics Magazine,2016,3(4):18-27.
• [5] Shi K,Song W,Ge H,et al.Transient analysis of microgrids with parallel synchronous generators and virtual synchronous generators[J].IEEE Transactions on Energy Conversion,2020,35(1):95-105.
• [6]郑天文，陈来军，陈天一，等．虚拟同步发电机技术及展望[J]．电力系统自动化，2015,39(21):165-175.ZhengTianwen,Chen Laijun,Chen Tianyi,et al.Review and prospect of virtual synchronous generator technologies[J].Automation of Electric Power Systems,2015,39(21):165-175(in Chinese).
• [7] Zhong Q, Weiss G. Synchronverters:inverters that mimic synchronous generators[J]. IEEE Transactions on Industrial Electronics,2011,58(4):1259-1267.
• [8]钟庆昌．虚拟同步机与自主电力系统[J]．中国电机工程学报，2017,37(2):336-349.ZhongQingchang.Virtual synchronous machines and autonomous power systems[J].Proceedings of the CSEE,2017,37(2):336-349(in Chinese).
• [9] Wu H,Ruan X,Yang D,et al.Small-signal modeling and parameters design for virtual synchronous generators[J].IEEE Transactions on Industrial Electronics,2016,63(7):4292-4303.
• [10] Zhong Q,Nguyen P,Ma Z,et al.Self-synchronized synchronverters:inverters without a dedicated synchronization unit[J]. IEEE Transactions on Power Electronics,2014,29(2):617-630.
• [11] Sun D,Wang X,Fang Y.Backstepping direct power control without phase-locked loop of AC/DC converter under both balanced and unbalanced grid conditions[J].IET Power Electronics,2016,9(8):1614-1624.
• [12] Suh Y,Lipo T.Control scheme in hybrid synchronous stationary frame for PWM AC/DC converter under generalized unbalanced operating conditions[J].IEEE Transactions on Industry Applications,2006,42(3):825-835.
• [13] Suh Y,Lipo T.Modeling and analysis of instantaneous active and reactive power for PWM AC/DC converter under generalized unbalanced network[J].IEEE Transactions on Power Delivery,2006,21(3):1530-1540.
• [14] Hu J,He Y.Modeling and control of grid-connected voltage-sourced converters under generalized unbalanced operation conditions[J].IEEE Transactions on Energy Conversion,2008,23(3):903-913.
• [15] Zhang Y,Qu C.Direct power control of a pulse width modulation rectifier using space vector modulation under unbalanced grid voltages[J].IEEE Transactions on Power Electronics,2015,30(10):5892-5901.
• [16] Zhang Y,Yang H.Model-predictive flux control of induction motor drives with switching instant optimization[J].IEEE Transactions on Energy Conversion,2015,30(3):1113-1122.
• [17] Zhang Y,Qu C.Table-based direct power control for three-phase AC/DC converters under unbalanced grid voltages[J]. IEEE Transactions on Power Electronics,2015,30(12):7090-7099.
• [18] Sun D,Wang X,Nian H,et al.A sliding-mode direct power control strategy for DFIG under both balanced and unbalanced grid conditions using extended active power[J].IEEE Transactions on Power Electronics,2018,33(2):1313-1322.
• [19]陈天一，陈来军，汪雨辰，等．考虑不平衡电网电压的虚拟同步发电机平衡电流控制方法[J]．电网技术，2016,40(3):904-909.Chen Tianyi,Chen Laijun,Wang Yuchen,et al.Balanced current control of virtual synchronous generator considering unbalanced grid voltage[J].Power System Technology,2016,40(3):904-909(in Chinese).
• [20]万晓凤，胡海林，聂晓艺，等．电网电压不平衡时的改进虚拟同步机控制策略[J]．电网技术，2017,41(11):3573-3581.Wan Xiaofeng,Hu Hailin,Nie Xiaoyi,et al.An improved control strategy for virtual synchronous generator under unbalanced grid voltage[J].Power System Technology,2017,41(11):3573-3581(in Chinese).
• [21] Wang X, Sun D. Multi-objective self-synchronised virtual synchronous generator in unbalanced power grid[J].Electronics Letters,2018,54(12):779-781.
• [22] Zheng X,Wang C,Pang S.Injecting positive-sequence current virtual synchronous generator control under unbalanced grid[J]. IET Renewable Power Generation,2019,13(1):165-170.
• [23]马文杰，欧阳森，杨林．适用于三相并网逆变器的新型谐振控制方法[J]．电网技术，2019,43(8):2884-2891.Ma Wenjie,OuyangSen,Yang Lin.A new resonant control strategy for three-phase grid connected inverter[J].Power System Technology,2019,43(8):2884-2891(in Chinese).