基于母线电压微分前馈的直流微电网并网变换器控制策略
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摘要
为解决直流微电网惯性低、抗扰动能力差的问题,提出基于母线电压微分前馈的直流微电网并网变换器电流控制策略。以三相半桥并网变换器为研究对象,根据不等式约束条件建立直流母线电压与电感电流线性控制关系,将母线电压变化率与原接网电感的稳态电流值相结合,作为电感电流的控制指令值。为降低扰动下母线电压跌落,利用能量与功率关系设计虚拟电容并将其引入母线电压控制环,实现在不增加实际电容的情况下提高直流微电网的抗扰动能力。同时,给出了加入虚拟电容后直流微电网的稳定性分析。仿真和实验验证了所提控制策略的可行性。
To solve the problem of low inertia and poor disturbance rejection of DC microgrid,this paper proposes a current control strategy of grid-connected inverter in the DC microgrid based on differential feedforward of bus voltage.Aiming at the three-phase half-bridge grid-connected converter,the linear control relationship between DC bus voltage and inductance current is established according to the inequality constraints in DC microgrid.The control instruction value of inductance current is generated by combining the variation rate of DC bus voltage with the steady-state current value of filter inductance.In order to reduce the bus voltage drop under the disturbance,the virtual capacitor is designed by using the relationship between energy and power,and it is introduced into the bus voltage control loop to improve the anti-disturbance ability of DC microgrid without increasing the actual capacitance.The stability analysis of DC microgrid after adding virtual capacitance is given.The feasibility of the proposed control strategy is verified by simulation and experiment.
To solve the problem of low inertia and poor disturbance rejection of DC microgrid,this paper proposes a current control strategy of grid-connected inverter in the DC microgrid based on differential feedforward of bus voltage.Aiming at the three-phase half-bridge grid-connected converter,the linear control relationship between DC bus voltage and inductance current is established according to the inequality constraints in DC microgrid.The control instruction value of inductance current is generated by combining the variation rate of DC bus voltage with the steady-state current value of filter inductance.In order to reduce the bus voltage drop under the disturbance,the virtual capacitor is designed by using the relationship between energy and power,and it is introduced into the bus voltage control loop to improve the anti-disturbance ability of DC microgrid without increasing the actual capacitance.The stability analysis of DC microgrid after adding virtual capacitance is given.The feasibility of the proposed control strategy is verified by simulation and experiment.
引文
[1]康重庆,姚良忠.高比例可再生能源电力系统的关键科学问题与理论研究框架[J].电力系统自动化,2017,41(9):2-11.DOI:10.7500/AEPS20170120004.KANG Chongqing,YAO Liangzhong.Key scientific issues and theoretical research framework for power systems with high proportion of renewable energy[J].Automation of Electric Power Systems,2017,41(9):2-11.DOI:10.7500/AEPS20170120004.
[2]TOMISLAV D,LU X,VASQUEZ J C,et al.DC microgrids:PartⅠa review of control strategies and stabilization techniques[J].IEEE Transactions on Power Electronics,2016,31(7):4876-4891.
[3]GUERRERO J M.VSQUEZ J C,MATAS J.Hierarchical control of droop-controlled AC and DC microgrids-ageneral approach toward standardization[J].IEEE Transactions on Industrial Electronics,2011,58(1):4305-4310.
[4]CORNEA O,ANDREESCU G D,MUNTEAN N,et al.Bidirectional power flow control in a DC microgrid through a switched-capacitor cell hybrid DC-DC converter[J].IEEETransactions on Industrial Electronics,2017,64(4):3012-3022.
[5]AUGUSTINE S,MISHRA M K,LAKSHMINARASAMMAN.Adaptive droop control strategy for load sharing and circulating current minimization in low-voltage standalone DCmicrogrid[J].IEEE Transactions on Sustainable Energy,2015,6(1):132-141.
[6]孟润泉,刘家赢,文波,等.直流微网混合储能控制及系统分层协调控制策略[J].高电压技术,2015,41(7):2186-2193.MENG Runquan,LIU Jiaying,WEN Bo,et al.Hybrid energy storage control and system hierarchical coordinated control strategy for DC microgrids[J].High Voltage Engineering,2015,41(7):2186-2193.
[7]谢文强,韩民晓,曹文远,等.储能换流器动态过程分析与前馈控制改进策略[J].电力系统自动化,2018,42(7):178-184.DOI:10.7500/AEPS20171206005.XIE Wenqiang,HAN Minxiao,CAO Wenyuan,et al.Dynamic process analysis and improved feedforward strategy for storage converters[J].Automation of Electric Power Systems,2018,42(7):178-184.DOI:10.7500/AEPS20171206005.
[8]张学广,付志超,陈文佳,等.弱电网下考虑锁相环影响的并网逆变器改进控制方法[J].电力系统自动化,2018,42(7):139-145.DOI:10.7500/AEPS20170623002.ZHANG Xueguang,FU Zhichao,CHEN Wenjia,et al.An improved control method for grid-connected inverters considering impact of phase-locked loop under weak grid condition[J].Automation of Electric Power Systems,2018,42(7):139-145.DOI:10.7500/AEPS20170623002.
[9]李一琳,董萍,刘明波,等.基于有限时间一致性的直流微电网分布式协调控制[J].电力系统自动化,2018,42(16):96-103.DOl:10.7500/AEPS20170907003.LI Yilin,DONG Ping,LIU Mingbo,et al.Distributed coordinated control of DC microgrid based on finite-time consensus algorithm[J].Automation of Electric Power Systems,2018,42(16):96-103.DOl:10.7500/AEPS20170907003.
[10]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(4):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(4):16-24.
[11]张犁,孙凯,吴田进,等.基于光伏发电的直流微电网能量变换与管理[J].电工技术学报,2013,28(2):248-254.ZHANG Li,SUN Kai,WU Tianjin,et al.Energy conversion and management for DC microgrid based on photovoltaic generation[J].Transactions of China Electrotechnical Society,2013,28(2):248-254.
[12]支娜,张辉.直流微电网改进分级控制策略研究[J].高电压技术,2016,42(4):1316-1325.ZHI Na,ZHANG Hui.Improved hierarchical control strategy for DC microgrid[J].High Voltage Engineering,2016,42(4):1316-1325.
[13]张继红,王洪明,魏毅立,等.含复合储能和燃气轮发电机的直流微电网母线电压波动分层控制策略[J].电工技术学报,2018,33(6):1238-1246.ZHANG Jihong,WANG Hongming,WEI Yili,et al.Hierarchical control strategy of voltage fluctuation in DCmicrogrid consisting gas-turbine generator and composite energy storage[J].Transactions of China Electrotechnical Society,2018,33(6):1238-1246.
[14]王成山,李微,王议锋,等.直流微电网母线电压波动分类及抑制方法综述[J].中国电机工程学报,2017,37(1):96-110.WANG Chengshan,LI Wei,WANG Yifeng,et al.DC bus voltage fluctuation classification and restraint methods review for DC microgrid[J].Proceedings of the CSEE,2017,37(1):96-110.
[15]康忠健,陈醒,崔朝丽,等.基于ESO与终端滑模控制的直流配电网母线电压控制[J].中国电机工程学报,2018,38(11):3235-3243.KANG Zhongjian,CHEN Xing,CUI Zhaoli,et al.Bus voltage control method of DC distribution network based on ESO and terminal sliding mode control[J].Proceedings of the CSEE,2018,38(11):3235-3243.
[16]王成山,李霞林,郭力.基于功率平衡及时滞补偿相结合的双级式变流器协调控制[J].中国电机工程学报,2012,32(25):109-117.WANG Chengshan,LI Xialin,GUO Li.Coordinated control of two-stage power converters based on power balancing and time-delay compensation[J].Proceedings of the CSEE,2012,32(25):109-117.
[17]郭小强,李建,张学,等.电网电压畸变不平衡情况下三相PWM整流器无锁相环直流母线恒压控制策略[J].中国电机工程学报,2015,35(8):2002-2008.GUO Xiaoqiang,LI Jian,ZHANG Xue,et al.Constant DCvoltage control strategy for three-phase PWM rectifier without phase-locked loop under distorted and unbalanced conditions[J].Proceedings of the CSEE,2015,35(8):2002-2008.
[18]EREN S,PAHLEVANINEZHAD M,BAKHSHAI A,et al.An adaptive droop DC-bus voltage controller for a gridconnected voltage source inverter with LCL filter[J].IEEETransactions on Power Electronics,2015,30(2):547-560.
[19]DAVARI M,MOHAMED Y I.Robust droop and DC-bus voltage control for effective stabilization and power sharing in VSC multiterminal DC grids[J].IEEE Transactions on Power Electronics,2018,33(5):4373-4395.
[20]WU T F,KUO C L,SUN K H,et al.Integration and operation of a single-phase bidirectional inverter with two buck/boost MPPTs for DC-distribution applications[J].IEEETransactions on Power Electronics,2013,28(11):5098-5106.
[21]WU T F,CHANG C H,LIN L C,et al.DC-bus voltage control with a three-phase bidirectional inverter for DCdistribution systems[J].IEEE Transactions on Power Electronics,2011,58(1):316-328.
[2]TOMISLAV D,LU X,VASQUEZ J C,et al.DC microgrids:PartⅠa review of control strategies and stabilization techniques[J].IEEE Transactions on Power Electronics,2016,31(7):4876-4891.
[3]GUERRERO J M.VSQUEZ J C,MATAS J.Hierarchical control of droop-controlled AC and DC microgrids-ageneral approach toward standardization[J].IEEE Transactions on Industrial Electronics,2011,58(1):4305-4310.
[4]CORNEA O,ANDREESCU G D,MUNTEAN N,et al.Bidirectional power flow control in a DC microgrid through a switched-capacitor cell hybrid DC-DC converter[J].IEEETransactions on Industrial Electronics,2017,64(4):3012-3022.
[5]AUGUSTINE S,MISHRA M K,LAKSHMINARASAMMAN.Adaptive droop control strategy for load sharing and circulating current minimization in low-voltage standalone DCmicrogrid[J].IEEE Transactions on Sustainable Energy,2015,6(1):132-141.
[6]孟润泉,刘家赢,文波,等.直流微网混合储能控制及系统分层协调控制策略[J].高电压技术,2015,41(7):2186-2193.MENG Runquan,LIU Jiaying,WEN Bo,et al.Hybrid energy storage control and system hierarchical coordinated control strategy for DC microgrids[J].High Voltage Engineering,2015,41(7):2186-2193.
[7]谢文强,韩民晓,曹文远,等.储能换流器动态过程分析与前馈控制改进策略[J].电力系统自动化,2018,42(7):178-184.DOI:10.7500/AEPS20171206005.XIE Wenqiang,HAN Minxiao,CAO Wenyuan,et al.Dynamic process analysis and improved feedforward strategy for storage converters[J].Automation of Electric Power Systems,2018,42(7):178-184.DOI:10.7500/AEPS20171206005.
[8]张学广,付志超,陈文佳,等.弱电网下考虑锁相环影响的并网逆变器改进控制方法[J].电力系统自动化,2018,42(7):139-145.DOI:10.7500/AEPS20170623002.ZHANG Xueguang,FU Zhichao,CHEN Wenjia,et al.An improved control method for grid-connected inverters considering impact of phase-locked loop under weak grid condition[J].Automation of Electric Power Systems,2018,42(7):139-145.DOI:10.7500/AEPS20170623002.
[9]李一琳,董萍,刘明波,等.基于有限时间一致性的直流微电网分布式协调控制[J].电力系统自动化,2018,42(16):96-103.DOl:10.7500/AEPS20170907003.LI Yilin,DONG Ping,LIU Mingbo,et al.Distributed coordinated control of DC microgrid based on finite-time consensus algorithm[J].Automation of Electric Power Systems,2018,42(16):96-103.DOl:10.7500/AEPS20170907003.
[10]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(4):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(4):16-24.
[11]张犁,孙凯,吴田进,等.基于光伏发电的直流微电网能量变换与管理[J].电工技术学报,2013,28(2):248-254.ZHANG Li,SUN Kai,WU Tianjin,et al.Energy conversion and management for DC microgrid based on photovoltaic generation[J].Transactions of China Electrotechnical Society,2013,28(2):248-254.
[12]支娜,张辉.直流微电网改进分级控制策略研究[J].高电压技术,2016,42(4):1316-1325.ZHI Na,ZHANG Hui.Improved hierarchical control strategy for DC microgrid[J].High Voltage Engineering,2016,42(4):1316-1325.
[13]张继红,王洪明,魏毅立,等.含复合储能和燃气轮发电机的直流微电网母线电压波动分层控制策略[J].电工技术学报,2018,33(6):1238-1246.ZHANG Jihong,WANG Hongming,WEI Yili,et al.Hierarchical control strategy of voltage fluctuation in DCmicrogrid consisting gas-turbine generator and composite energy storage[J].Transactions of China Electrotechnical Society,2018,33(6):1238-1246.
[14]王成山,李微,王议锋,等.直流微电网母线电压波动分类及抑制方法综述[J].中国电机工程学报,2017,37(1):96-110.WANG Chengshan,LI Wei,WANG Yifeng,et al.DC bus voltage fluctuation classification and restraint methods review for DC microgrid[J].Proceedings of the CSEE,2017,37(1):96-110.
[15]康忠健,陈醒,崔朝丽,等.基于ESO与终端滑模控制的直流配电网母线电压控制[J].中国电机工程学报,2018,38(11):3235-3243.KANG Zhongjian,CHEN Xing,CUI Zhaoli,et al.Bus voltage control method of DC distribution network based on ESO and terminal sliding mode control[J].Proceedings of the CSEE,2018,38(11):3235-3243.
[16]王成山,李霞林,郭力.基于功率平衡及时滞补偿相结合的双级式变流器协调控制[J].中国电机工程学报,2012,32(25):109-117.WANG Chengshan,LI Xialin,GUO Li.Coordinated control of two-stage power converters based on power balancing and time-delay compensation[J].Proceedings of the CSEE,2012,32(25):109-117.
[17]郭小强,李建,张学,等.电网电压畸变不平衡情况下三相PWM整流器无锁相环直流母线恒压控制策略[J].中国电机工程学报,2015,35(8):2002-2008.GUO Xiaoqiang,LI Jian,ZHANG Xue,et al.Constant DCvoltage control strategy for three-phase PWM rectifier without phase-locked loop under distorted and unbalanced conditions[J].Proceedings of the CSEE,2015,35(8):2002-2008.
[18]EREN S,PAHLEVANINEZHAD M,BAKHSHAI A,et al.An adaptive droop DC-bus voltage controller for a gridconnected voltage source inverter with LCL filter[J].IEEETransactions on Power Electronics,2015,30(2):547-560.
[19]DAVARI M,MOHAMED Y I.Robust droop and DC-bus voltage control for effective stabilization and power sharing in VSC multiterminal DC grids[J].IEEE Transactions on Power Electronics,2018,33(5):4373-4395.
[20]WU T F,KUO C L,SUN K H,et al.Integration and operation of a single-phase bidirectional inverter with two buck/boost MPPTs for DC-distribution applications[J].IEEETransactions on Power Electronics,2013,28(11):5098-5106.
[21]WU T F,CHANG C H,LIN L C,et al.DC-bus voltage control with a three-phase bidirectional inverter for DCdistribution systems[J].IEEE Transactions on Power Electronics,2011,58(1):316-328.
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