张北数据港柔性变电站DC/AC变流器关键控制策略
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摘要
柔性直流输电是实现新能源并网和直流电网的极具潜力的输电方式。文中在张北数据港设计构造了一台柔性直流输电系统用DC/AC变流器。所设计的变流器采用多变流器并联+z型接地变压器结构。为抑制离网下由于负荷特性而造成的输出电压不平衡与输出电压畸变问题,分别提出了变流器输出电压不平衡控制策略与输出电压谐波抑制策略,以保证设备的供电质量。为保证设备的不间断供电并提高设备的供电可靠性,提出一种主动限流控制策略,在设备离网供电模式下电力系统发生短路故障时进行主动限流。最后,搭建了2.5 MW DC/AC变流器进行实验研究。实验结果验证了所提控制策略的有效性。目前,该装置已应用于张北数据港柔性变电站。
The voltage source converter based high voltage direct current(VSC-HVDC) technology is a potential transmission method for new energy grid-connection and DC grids. A DC/AC converter for VSC-HVDC transmission system is designed and constructed in Zhangbei data center. The designed DC/AC converters adopts the structure of paralleled multi-converter+z-type grounding transformer. In order to suppress the output voltage unbalance and output voltage distortion caused by load characteristics in the off-grid mode, an unbalance control strategy and a harmonic suppression strategy of converter output voltage are proposed to ensure the quality of power supply. In order to ensure the uninterrupted power supply and improve the power supply reliability of the equipment, an active current-limiting control strategy is proposed to limit the current actively when the power system has a short-circuit fault in the off-grid power supply mode. Finally, a 2.5 MW DC/AC converter is built for experimental research. The experimental results verify the effectiveness of the proposed control strategy. The designed converter has been applied to the flexible substation in Zhangbei data center.
The voltage source converter based high voltage direct current(VSC-HVDC) technology is a potential transmission method for new energy grid-connection and DC grids. A DC/AC converter for VSC-HVDC transmission system is designed and constructed in Zhangbei data center. The designed DC/AC converters adopts the structure of paralleled multi-converter+z-type grounding transformer. In order to suppress the output voltage unbalance and output voltage distortion caused by load characteristics in the off-grid mode, an unbalance control strategy and a harmonic suppression strategy of converter output voltage are proposed to ensure the quality of power supply. In order to ensure the uninterrupted power supply and improve the power supply reliability of the equipment, an active current-limiting control strategy is proposed to limit the current actively when the power system has a short-circuit fault in the off-grid power supply mode. Finally, a 2.5 MW DC/AC converter is built for experimental research. The experimental results verify the effectiveness of the proposed control strategy. The designed converter has been applied to the flexible substation in Zhangbei data center.
引文
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[13] HU Chenwang,ZENG Xiangjun.Fault analysis of a grounding transformer[C]// IEEE Applied Power Electronics Conference and Exposition (APEC),July 17-19,2010,Okayama,Japan:579-584.
[14] 蒋仁江,英云龙,秦志成,等.Z型接地变压器在PSCAD下的仿真模型构建[J].价值工程,2015,34(29):137-138.JIANG Renjiang,YING Yunlong,QIN Zhicheng,et al.Simulation model of zigzag grounding transformer by PSCAD[J].Value Engineering,2015,34(29):137-138.
[15] 涂娟,汤宁平.基于改进型DSOGI-PLL的电网电压同步信号检测[J].中国电机工程学报,2016,36(9):2350-2356.TU Juan,TANG Ningping.Synchronizing signal detection for grid voltage based on modified DSOGI-PLL[J].Proceedings of the CSEE,2016,36(9):2350-2356.
[16] 肖华根,罗安,王逸超,等.微网中并联逆变器的环流控制方法[J].中国电机工程学报,2014,34(19):3098-3104.XIAO Huagen,LUO An,WANG Yichao,et al.A circulating current control method for paralleled inverters in microgrids[J].Proceedings of the CSEE,2014,34(19):3098-3104.
[17] CHEN T P.Zero-sequence circulating current reduction method for parallel HEPWM inverters between AC bus and DC bus[J].IEEE Transactions on Industrial Electronics,2012,59(1):290-300.
[18] 贺超,陈国柱.基于主从控制的变流器并联系统输出电流一致性分析[J].电力系统自动化,2014,38(11):116-122.HE Chao,CHEN Guozhu.Current consistency analysis of parallel converters based on master-slave control[J].Automation of Electric Power Systems,2014,38(11):116-122.
[19] 周创彬.不平衡负载下三相工频UPS逆变器控制策略研究[D].广州:华南理工大学,2013.ZHOU Chuangbin.Research on control strategy of three-phase transformer UPS inverters under unbalanced loads[D].Guangzhou:South China University of Technology,2013.
[20] LOH,C P,TANG Y,WANG P,et al.Complex-vector time-delay control of power converters[C]// IEEE Industry Applications Society Annual Meeting,October 5-9,2008,Edmonton,AB,Canada.
[21] QUOC-NAM T,LEE H H.An advanced current control strategy for three-phase shunt active power filters[J].IEEE Transactions on Industrial Electronics,2013,60(12):5400-5410.
[22] YEPES A G,FREIJEDO F D,DOVAL-GANDOY J,et al.Effects of discretization methods on the performance of resonant controllers[J].IEEE Transactions on Power Electronics,2010,25(7):1692-1712.
[23] YEPES A G,FREIJEDO FD.High-performance digital resonant controllers implemented with two integrators[J].IEEE Transactions on Power Electronics,2011,26(2):563-576.
[24] 石辛民,郝整清.模糊控制及其MATLAB仿真[M].北京:清华大学出版社,2008:89-123.SHI Xinmin,HAO Zhengqing.Fuzzy control and its MATLAB simulation[M].Beijing:Tsinghua University Press,2008:89-123.
[2] 张学,裴玮,范士雄,等.含多端柔性互联装置的交直流混合配电网协调控制方法[J].电力系统自动化,2018,42(7):185-191.DOI:10.7500/AEPS20170502005.ZHANG Xue,PEI Wei,FAN Shixiong,et al.Coordinated control method of AC/DC hybrid distribution network with multi-terminal flexible interconnection devices[J].Automation of Electric Power Systems,2018,42(7):185-191.DOI:10.7500/AEPS20170502005.
[3] 王恒利,付立军,肖飞,等.三相逆变器不平衡负载条件下双环控制策略[J].电网技术,2013,37(2):398-404.WANG Hengli,FU Lijun,XIAO Fei,et al.A double-loop control strategy for three-phase inverter with unbalanced load[J].Power System Technology,2013,37(2):398-404.
[4] KABIRI R,HOLMES D G.Double synchronous frame current regulation of distributed generation systems under unbalanced voltage conditions without sequence current separation[C]// IEEE Applied Power Electronics Conference and Exposition,March 15-19,2015,Charlotte,USA:1822-1829.
[5] 韦徵,茹心芹,石伟,等.适用于不平衡负载工况下的微网逆变器控制策略[J].电力系统自动化,2016,40(20):76-82.WEI Zheng,RU Xinqin,SHI Wei,et al.Control strategy for microgrid inverter under unbalanced load conditions[J].Automation of Electric Power Systems,2016,40(20):76-82.
[6] LASCU C,ASIMINOAEI L,BOLDEA I,et al.Frequency response analysis of current controllers for selective harmonic compensation in active power filters[J].IEEE Transactions on Industrial Electronics,2009,56(2):337-347.
[7] TAN A,BAYINDIR K C.Multiple harmonic elimination-based feedback controller for shunt hybrid active power filter[J].IET Power Electronics,2017,10(8):945-956.
[8] COSTA B L G,BACON V D,DA SILVA S A O,et al.Tuning of a PI-MR controller based on differential evolution metaheuristic applied to the current control loop of a shunt-APF[J].IEEE Transactions on Industrial Electronics,2017,64(6):4751-4761.
[9] TRINH Q N,LEE H H.An advanced current control strategy for three-phase shunt active power filters[J].IEEE Transactions on Industrial Electronics,2013,60(12):5400-5410.
[10] 陈宇,刘慧,裴雪军,等.大功率组合式逆变器限流技术研究[J].电力电子技术,2008,42(5):69-71.CHEN Yu,LIU Hui,PEI Xuejun,et al.Research on current limiting scheme for high power combined inverter[J].Power Electronics,2008,42(5):69-71.
[11] 唐亚迪,徐永海,洪旺松.基于模糊控制模型的电压暂降监测装置优化配置[J].电力自动化设备,2015,35(8):65-71.TANG Yadi,XU Yonghai,HONG Wangsong.Allocation optimization based on fuzzy control model for voltage-sag monitors[J].Electric Power Automation Equipment,2015,35(8):65-71.
[12] 杜新伟,刘涤尘,李媛,等.自适应神经模糊推理系统在电力故障重现中的应用[J].电网技术,2006,30(6):82-87.DU Xinwei,LIU Dichen,LI Yuan,et al.Application of adaptive neuro-fuzzy inference system in power system fault recurrence[J].Power System Technology,2006,30(6):82-87.
[13] HU Chenwang,ZENG Xiangjun.Fault analysis of a grounding transformer[C]// IEEE Applied Power Electronics Conference and Exposition (APEC),July 17-19,2010,Okayama,Japan:579-584.
[14] 蒋仁江,英云龙,秦志成,等.Z型接地变压器在PSCAD下的仿真模型构建[J].价值工程,2015,34(29):137-138.JIANG Renjiang,YING Yunlong,QIN Zhicheng,et al.Simulation model of zigzag grounding transformer by PSCAD[J].Value Engineering,2015,34(29):137-138.
[15] 涂娟,汤宁平.基于改进型DSOGI-PLL的电网电压同步信号检测[J].中国电机工程学报,2016,36(9):2350-2356.TU Juan,TANG Ningping.Synchronizing signal detection for grid voltage based on modified DSOGI-PLL[J].Proceedings of the CSEE,2016,36(9):2350-2356.
[16] 肖华根,罗安,王逸超,等.微网中并联逆变器的环流控制方法[J].中国电机工程学报,2014,34(19):3098-3104.XIAO Huagen,LUO An,WANG Yichao,et al.A circulating current control method for paralleled inverters in microgrids[J].Proceedings of the CSEE,2014,34(19):3098-3104.
[17] CHEN T P.Zero-sequence circulating current reduction method for parallel HEPWM inverters between AC bus and DC bus[J].IEEE Transactions on Industrial Electronics,2012,59(1):290-300.
[18] 贺超,陈国柱.基于主从控制的变流器并联系统输出电流一致性分析[J].电力系统自动化,2014,38(11):116-122.HE Chao,CHEN Guozhu.Current consistency analysis of parallel converters based on master-slave control[J].Automation of Electric Power Systems,2014,38(11):116-122.
[19] 周创彬.不平衡负载下三相工频UPS逆变器控制策略研究[D].广州:华南理工大学,2013.ZHOU Chuangbin.Research on control strategy of three-phase transformer UPS inverters under unbalanced loads[D].Guangzhou:South China University of Technology,2013.
[20] LOH,C P,TANG Y,WANG P,et al.Complex-vector time-delay control of power converters[C]// IEEE Industry Applications Society Annual Meeting,October 5-9,2008,Edmonton,AB,Canada.
[21] QUOC-NAM T,LEE H H.An advanced current control strategy for three-phase shunt active power filters[J].IEEE Transactions on Industrial Electronics,2013,60(12):5400-5410.
[22] YEPES A G,FREIJEDO F D,DOVAL-GANDOY J,et al.Effects of discretization methods on the performance of resonant controllers[J].IEEE Transactions on Power Electronics,2010,25(7):1692-1712.
[23] YEPES A G,FREIJEDO FD.High-performance digital resonant controllers implemented with two integrators[J].IEEE Transactions on Power Electronics,2011,26(2):563-576.
[24] 石辛民,郝整清.模糊控制及其MATLAB仿真[M].北京:清华大学出版社,2008:89-123.SHI Xinmin,HAO Zhengqing.Fuzzy control and its MATLAB simulation[M].Beijing:Tsinghua University Press,2008:89-123.