基于统一控制策略的光伏微网控制器参数敏感性分析
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摘要
针对低压光伏微网中逆变器的控制,设计了一种基于统一控制策略的控制器,能够避免微网在并网和孤岛两种运行方式间切换时控制策略的转换,实现不同运行模式间的平滑切换及光伏微源功率均分。对传统的下垂控制进行改进,在传统下垂控制的基础上引入一个功率PI补偿器。根据阶跃响应动态指标和稳定性要求,利用根轨迹法优化设计控制器参数。最后,在Matlab/Simulink环境下进行了仿真,结果验证了所设计的控制器的可行性和有效性。
A controller based on unified control strategy for the DC/AC converters in a low-voltage photovoltaic micro-grid(PV-MG) is proposed for both grid-connected and islanding mode operation and seamless switching as well as power sharing of the PV generators, which can avoid using two different control strategies when the PV-MG operates at grid-connected or islanding mode. The unified controller is designed by combining the power PI compensator with droop control, and can realize the automatic and seamless switching between the two modes of PV-MG. According to the step response dynamic index and stability constraints, the parameters of the controller are optimized with root locus methods. The Matlab/Simulink simulation results verfy the feasibility and effectiveness of the proposed controller.
A controller based on unified control strategy for the DC/AC converters in a low-voltage photovoltaic micro-grid(PV-MG) is proposed for both grid-connected and islanding mode operation and seamless switching as well as power sharing of the PV generators, which can avoid using two different control strategies when the PV-MG operates at grid-connected or islanding mode. The unified controller is designed by combining the power PI compensator with droop control, and can realize the automatic and seamless switching between the two modes of PV-MG. According to the step response dynamic index and stability constraints, the parameters of the controller are optimized with root locus methods. The Matlab/Simulink simulation results verfy the feasibility and effectiveness of the proposed controller.
引文
[1]杜燕.微网逆变器的控制策略及组网特性研究[D].合肥:合肥工业大学,2013.Du Yan.Control Strategies and Performance of Microgrid Inverters[D].Hefei:He Fei University of Technology,2013(in Chinese).
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[3]王晓寰,张春江.分布式发电系统无缝切换控制策略[J]电工技术学报,2012,27(2):217-222.Wang Xiaohuan,Zhang Chunjiang.Study of control strate gy for seamless transfer of grid-connecteddistributed gener ation systems[J].Transactions of China Electrotechnical Society,2012,27(2):217-222(in Chinese).
[4]Zeng Liu,Jinjun Liu,Yalin Zhao.A unified control strateg for three-phase inverter in distributed generation[J].IEEETransactions on Power Electronics,2014,29(3):1176-1191.
[5]Delghavi M B,Yazdani A.A unified control strategy for electronically interfaced distributed energy resources[J].IEEE Transactions on Power Delivery,2012,27(2):803-812.
[6]Mao M,Liu Y,Jin P,et al.Energy coordinated control of hybrid battery-supercapacitor storage system in a microgrid[C].//Power Electronics for Distributed Generation Systems(PEDG),2013 4th IEEE International Symposium on.IEEE,2013:1-6.
[7]杨柳,王萍.基于虚拟阻抗参数优化的并联逆变器控制研究[J].电源学报,2014,12(6):73-78.Yang Liu,Wang Ping.Parameter optimization of virtual impedance for parallel inverter[J].Journal of Power Supply,2014,12(6):73-78(in Chinese).
[8]Wei Yao,Min Chen,Matas J,et al.Design and analysis of the droop control method for parallel inverters considering the impact of the complex impedance on the power sharing[J].IEEE Transactions on Industrial Electronics,2011,58(2):576-588.
[9]Guerrero J M,Vasquez J C,Matas J,et al.Control strategy for flexible microgrid based on parallel line-interactive UPSsystems[J].IEEE Transactions on Industrial Electronics2009,56(3):726-736.
[2]Mao M,Huang H,Chang L.Real-time energy coordinated and balance control strategies for microgrid with photovoltaic generators[C].//Power Electronics for Distributed Generation Systems(PEDG),2013 4th IEEE Internationa Symposium on.IEEE,2013:1-7.
[3]王晓寰,张春江.分布式发电系统无缝切换控制策略[J]电工技术学报,2012,27(2):217-222.Wang Xiaohuan,Zhang Chunjiang.Study of control strate gy for seamless transfer of grid-connecteddistributed gener ation systems[J].Transactions of China Electrotechnical Society,2012,27(2):217-222(in Chinese).
[4]Zeng Liu,Jinjun Liu,Yalin Zhao.A unified control strateg for three-phase inverter in distributed generation[J].IEEETransactions on Power Electronics,2014,29(3):1176-1191.
[5]Delghavi M B,Yazdani A.A unified control strategy for electronically interfaced distributed energy resources[J].IEEE Transactions on Power Delivery,2012,27(2):803-812.
[6]Mao M,Liu Y,Jin P,et al.Energy coordinated control of hybrid battery-supercapacitor storage system in a microgrid[C].//Power Electronics for Distributed Generation Systems(PEDG),2013 4th IEEE International Symposium on.IEEE,2013:1-6.
[7]杨柳,王萍.基于虚拟阻抗参数优化的并联逆变器控制研究[J].电源学报,2014,12(6):73-78.Yang Liu,Wang Ping.Parameter optimization of virtual impedance for parallel inverter[J].Journal of Power Supply,2014,12(6):73-78(in Chinese).
[8]Wei Yao,Min Chen,Matas J,et al.Design and analysis of the droop control method for parallel inverters considering the impact of the complex impedance on the power sharing[J].IEEE Transactions on Industrial Electronics,2011,58(2):576-588.
[9]Guerrero J M,Vasquez J C,Matas J,et al.Control strategy for flexible microgrid based on parallel line-interactive UPSsystems[J].IEEE Transactions on Industrial Electronics2009,56(3):726-736.