基于电压电流协同控制的微网运行模式无缝切换策略
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摘要
主从型微网从并网切换到孤岛时,主逆变器由电流控制模式切换到电压控制模式,需改变控制器结构,并且孤岛检测期间电压不可控。针对上述问题,提出一种电压电流协同控制策略,在整个运行过程中用电压控制器对微网内负载的电压进行控制。并网时电压控制器经调节后平衡微网内负载功率并达到稳定输出;同时附加上电流控制器控制输出电流,保持微网和电网间功率平衡。孤岛后电流控制器退出运行,电压控制器继续控制微网内负载电压,保证微网内负载功率始终处于平衡状态,控制器输出具有连续性,控制模式也平滑切换到电压控制。根据所述电压电流协同控制策略设计了相应的电压控制器和电流控制器。最后进行Simulink仿真及实验验证,结果证明了协同控制策略能实现微网运行模式的无缝切换。
When master-slave microgrid is transfered from grid-connected mode to islanding mode, the control mode of master inverter changes from current control to voltage control. But the controller structrue must be transferred and voltage is unable to be controlled in islanding detection period. To solve the above problems, a control strategy based on collaborative control of voltage and current is proposed, in which load voltage is controlled by voltage controller during the whole working process. In the grid-connected mode, voltage controller keeps power balance with microgrid load and makes a stable output, meanwhile an additional current controller is introduced to regulate output current and keep power balance between microgrid and the grid. In islanding mode, the current controller quits from working, and the load voltage is still maintained by voltage controller. So the power can be balanced and the output of controller is continuous. Besides, the control mode has been transferred to voltage control mode seamlessly. According to the described collaborative control of voltage and current, a voltage controller and a current controller are designed. Finally, simulations using Simulink and experiments show that the collaborative control of voltage and current can realize seamless transfer of microgrid.
When master-slave microgrid is transfered from grid-connected mode to islanding mode, the control mode of master inverter changes from current control to voltage control. But the controller structrue must be transferred and voltage is unable to be controlled in islanding detection period. To solve the above problems, a control strategy based on collaborative control of voltage and current is proposed, in which load voltage is controlled by voltage controller during the whole working process. In the grid-connected mode, voltage controller keeps power balance with microgrid load and makes a stable output, meanwhile an additional current controller is introduced to regulate output current and keep power balance between microgrid and the grid. In islanding mode, the current controller quits from working, and the load voltage is still maintained by voltage controller. So the power can be balanced and the output of controller is continuous. Besides, the control mode has been transferred to voltage control mode seamlessly. According to the described collaborative control of voltage and current, a voltage controller and a current controller are designed. Finally, simulations using Simulink and experiments show that the collaborative control of voltage and current can realize seamless transfer of microgrid.
引文
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[16] 苏小玲,韩民晓,孙海.基于自适应全局滑模控制的微电网稳定控制策略[J].中国电机工程学报,2014,34(31):5534-5541.SU Xiaoling, HAN Minxiao, SUN Hai. Stability control strategy for microgrid based on adaptive total sliding-mode control[J]. Proceedings of the CSEE, 2014, 34(31): 5534-5541.
[17] 米阳,夏洪亮,符杨,等.基于鲁棒下垂控制策略的微网平滑切换[J].电网技术,2016,40(8):2309-2315.MI Yang, XIA Hongliang, FU Yang, et al. Smooth switching of microgrid operation states based on robust droop control strategy[J]. Power System Technology, 2016, 40(8): 2309-2315.
[18] 陈杰,钮博文,张俊文,等.微电网运行模式平滑转换的混合控制策略[J].电工技术学报,2015,35(17):4379-4387.CHEN Jie, NIU Bowen, ZHANG Junwen, et al. Hybrid control strategy for the seamless transfer of microgrids[J]. Transactions of China Electrotechnical Society, 2015, 35(17): 4379-4387.
[19] 阚加荣,谢少军,姚志垒,等.低压微电网中并网逆变器主动移频式孤岛检测技术[J].电力系统自动化,2012,36(7):33-37.KAN Jiarong, XIE Shaojun, YAO Zhilei, et al. An islanding detection method on active frequency drifting for grid-connected inverters in low voltage microgrids[J]. Automation of Electric Power Systems, 2012, 36(7): 33-37.continuedonpage158)continued from page 135)
[20] BLAABJERG F, TEODORESCU R, LISERRE M, et al. Overview of control and grid synchronization for distributed power generation systems[J]. IEEE Transactions on Industry Electronics, 2006, 53(5): 1398-1409.
[2] 杨新法,苏剑,吕志鹏,等.微电网技术综述[J].中国电机工程学报,2014,34(1):57-70.YANG Xinfa, SU Jian, Lü Zhipeng, et al. Overview on micro-grid technology[J]. Proceedings of the CSEE, 2014, 34(1): 57-70.
[3] 王成山,王守相.分布式发电供能系统若干问题研究[J].电力系统自动化,2008,32(20):1-4.WANG Chengshan, WANG Shouxiang. Study on some key problems related to distributed generation systems[J]. Automation of Electric Power Systems, 2008, 32(20): 1-4.
[4] 黄伟,孙昶辉,吴子平,等.含分布式发电系统的微网技术研究综述[J].电网技术,2009,33(9):14-18.HUANG Wei, SUN Changhui, WU Ziping, et al. A review on microgrid technology containing distributed generation system[J]. Power System Technology, 2009, 33(9): 14-18.
[5] MOHAMED Y, EL-SAADANY E. Adaptive decentralized droop controller to preserve power sharing stability of paralleled inverters in distributed generation microgrids[J]. IEEE Transactions on Power Electronics, 2008, 23(6): 2806-2816.
[6] BARKLUND E, POGAKU N, PRODANOVIC M, et al. Energy management in autonomous microgrid using stability-constrained droop control of inverters[J]. IEEE Transactions on Power Electronics, 2008, 23(5): 2346-2352.
[7] 张明锐,杜志超,王少波.微网中下垂控制策略及参数选择研究[J].电工技术学报,2014,29(2):136-144.ZHANG Mingrui, DU Zhichao, WANG Shaobo. Research on droop control strategy and parameters[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 136-144.
[8] 荆龙,黄杏,吴学智.改进型微源下垂控制策略研究[J].电工技术学报,2014,29(2):145-152.JING Long, HUANG Xing, WU Xuezhi. Research on improved microsource droop control method[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 145-152.
[9] 陈燕东,罗安,龙际根.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. 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.
[10] 施永,赖纪东,苏建徽,等.微网系统运行模式平滑切换控制策略[J].电力系统自动化,2016,40(8):85-91.SHI Yong, LAI Jidong, SU Jianhui, et al. Control strategy of seamless transfer for microgrid operation mode[J]. Automation of Electric Power Systems, 2016, 40(8): 85-91.
[11] 石荣亮,张兴,徐海珍,等.基于虚拟同步发电机的微网运行模式无缝切换控制策略[J].电力系统自动化,2016,40(10):16-23.SHI Rongliang, ZHANG Xing, XU Haizhen, et al. Seamless switching control strategy for microgrid operation modes based on virtual synchronous generator[J]. Automation of Electric Power Systems, 2016, 40(10): 16-23.
[12] 陈杰,陈新,冯志阳,等.微网系统并网/孤岛运行模式无缝切换控制策略[J].中国电机工程学报,2014,34(19):3089-3097.CHEN Jie, CHEN Xin, FENG Zhiyang, et al. A control strategy of seamless transfer between grid-connected and islanding operation for microgrid[J]. Proceedings of the CSEE, 2014, 34(19): 3089-3097.
[13] 毕大强,周稳,戴瑜兴,等.交直流混合微电网中储能变流器无缝切换策略[J].电力系统自动化,2016,40(10):84-89.BI Daqiang, ZHOU Wen, DAI Yuxing, et al. Control strategies of seamless switching for energy storage converter in hybrid AD/DC microgrid[J]. Automation of Electric Power Systems, 2016, 40(10): 84-89.
[14] 邱麟,许烈,郑泽东,等.微电网运行模式平滑切换的控制策略[J].电工技术学报,2014,29(2):171-176.QIU Lin, XU Lie, ZHENG Zedong, et al. Control method of microgrid seamless switching[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 171-176.
[15] 陈新,姬秋华,刘飞.基于微网主从结构的平滑切换控制策略[J].电工技术学报,2014,29(2):163-170.CHEN Xin, JI Qiuhua, LIU Fei. Smooth transferring control method of microgrids based on master-slave configuration[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 163-170.
[16] 苏小玲,韩民晓,孙海.基于自适应全局滑模控制的微电网稳定控制策略[J].中国电机工程学报,2014,34(31):5534-5541.SU Xiaoling, HAN Minxiao, SUN Hai. Stability control strategy for microgrid based on adaptive total sliding-mode control[J]. Proceedings of the CSEE, 2014, 34(31): 5534-5541.
[17] 米阳,夏洪亮,符杨,等.基于鲁棒下垂控制策略的微网平滑切换[J].电网技术,2016,40(8):2309-2315.MI Yang, XIA Hongliang, FU Yang, et al. Smooth switching of microgrid operation states based on robust droop control strategy[J]. Power System Technology, 2016, 40(8): 2309-2315.
[18] 陈杰,钮博文,张俊文,等.微电网运行模式平滑转换的混合控制策略[J].电工技术学报,2015,35(17):4379-4387.CHEN Jie, NIU Bowen, ZHANG Junwen, et al. Hybrid control strategy for the seamless transfer of microgrids[J]. Transactions of China Electrotechnical Society, 2015, 35(17): 4379-4387.
[19] 阚加荣,谢少军,姚志垒,等.低压微电网中并网逆变器主动移频式孤岛检测技术[J].电力系统自动化,2012,36(7):33-37.KAN Jiarong, XIE Shaojun, YAO Zhilei, et al. An islanding detection method on active frequency drifting for grid-connected inverters in low voltage microgrids[J]. Automation of Electric Power Systems, 2012, 36(7): 33-37.continuedonpage158)continued from page 135)
[20] BLAABJERG F, TEODORESCU R, LISERRE M, et al. Overview of control and grid synchronization for distributed power generation systems[J]. IEEE Transactions on Industry Electronics, 2006, 53(5): 1398-1409.