This paper presents control methods for hybrid AC/DC microgrid under islanding operation condition.The control schemes for AC sub-microgrid and DC sub-microgrid are investigated according to the power sharing requirem...This paper presents control methods for hybrid AC/DC microgrid under islanding operation condition.The control schemes for AC sub-microgrid and DC sub-microgrid are investigated according to the power sharing requirement and operational reliability.In addition,the key control schemes of interlinking converter with DC-link capacitor or energy storage,which will devote to the proper power sharing between AC and DC sub-microgrids to maintain AC and DC side voltage stable,is reviewed.Combining the specific control methods developed for AC and DC sub-microgrids with interlinking converter,the whole hybrid AC/DC microgrid can manage the power flow transferred between sub-microgrids for improving on the operational quality and efficiency.展开更多
With the highly-extensive integration of distributed renewable energy resources(DER)into the grid,the power distribution system has changed greatly in the structure,function and operating characteristics.On this groun...With the highly-extensive integration of distributed renewable energy resources(DER)into the grid,the power distribution system has changed greatly in the structure,function and operating characteristics.On this ground,An AC-DC hybrid DER system becomes necessary for effective management and control over DER.This paper first summarizes the physical characteristics and morphological evolution of AC-DC hybrid DER system.The impact of these new features on system configuration planning is analyzed with respect to its flexible networking,rich operation control modes,and tight sourcenetwork-load-storage coupling.Then,based on a review of the existing research,problems and technical difficulties are figured out in terms of converter modeling,steady-state analysis,power flow calculation,operating scenarios management,and optimization model solution.In light of the problems and difficulties,a framework for the configuration optimization of AC-DC hybrid DER systems is proposed.At last,the paper provides a prospect of key technologies from six aspects including morphology forecasting,coupling interaction analysis,uncertainty modeling,operation simulation,optimization model solving algorithm and comprehensive scheme evaluation.展开更多
在光储交流微电网孤岛模式下,合理管控网内功率,实现多储能与多光伏间协调运行是维持系统长期稳定的关键。据此,提出一种改进型主从式光储协调控制策略,首先,对储能设计一种基于荷电状态(state of charge,SOC)的改进型对等控制方法,使...在光储交流微电网孤岛模式下,合理管控网内功率,实现多储能与多光伏间协调运行是维持系统长期稳定的关键。据此,提出一种改进型主从式光储协调控制策略,首先,对储能设计一种基于荷电状态(state of charge,SOC)的改进型对等控制方法,使多个储能在孤岛情况下可共同支撑交流母线电压,输出功率得到合理分配,稳态下各储能SOC值达到平衡。其次,对光伏设计一种基于交流母线电压信号的自适应功率控制方法,使多个光伏可根据接入点电压频率及幅值自适应调整输出的有功功率和无功功率,能防止储能过度充电并降低储能侧无功输出负担。将上述两种控制方法相结合实现多储能与多光伏间协调运行,协调过程呈现主从关系,通过分析该协调过程,能合理设计网内负荷功耗并引入负荷管理机制。进一步对系统模型进行小干扰稳定性分析可确定控制参数变化对系统的影响。最后,通过基于Rt-lab的硬件在环实验验证了控制策略的有效性。展开更多
文摘This paper presents control methods for hybrid AC/DC microgrid under islanding operation condition.The control schemes for AC sub-microgrid and DC sub-microgrid are investigated according to the power sharing requirement and operational reliability.In addition,the key control schemes of interlinking converter with DC-link capacitor or energy storage,which will devote to the proper power sharing between AC and DC sub-microgrids to maintain AC and DC side voltage stable,is reviewed.Combining the specific control methods developed for AC and DC sub-microgrids with interlinking converter,the whole hybrid AC/DC microgrid can manage the power flow transferred between sub-microgrids for improving on the operational quality and efficiency.
基金This work was supported by the National Key R&D Program of China(2017YFB0903300).
文摘With the highly-extensive integration of distributed renewable energy resources(DER)into the grid,the power distribution system has changed greatly in the structure,function and operating characteristics.On this ground,An AC-DC hybrid DER system becomes necessary for effective management and control over DER.This paper first summarizes the physical characteristics and morphological evolution of AC-DC hybrid DER system.The impact of these new features on system configuration planning is analyzed with respect to its flexible networking,rich operation control modes,and tight sourcenetwork-load-storage coupling.Then,based on a review of the existing research,problems and technical difficulties are figured out in terms of converter modeling,steady-state analysis,power flow calculation,operating scenarios management,and optimization model solution.In light of the problems and difficulties,a framework for the configuration optimization of AC-DC hybrid DER systems is proposed.At last,the paper provides a prospect of key technologies from six aspects including morphology forecasting,coupling interaction analysis,uncertainty modeling,operation simulation,optimization model solving algorithm and comprehensive scheme evaluation.
文摘在光储交流微电网孤岛模式下,合理管控网内功率,实现多储能与多光伏间协调运行是维持系统长期稳定的关键。据此,提出一种改进型主从式光储协调控制策略,首先,对储能设计一种基于荷电状态(state of charge,SOC)的改进型对等控制方法,使多个储能在孤岛情况下可共同支撑交流母线电压,输出功率得到合理分配,稳态下各储能SOC值达到平衡。其次,对光伏设计一种基于交流母线电压信号的自适应功率控制方法,使多个光伏可根据接入点电压频率及幅值自适应调整输出的有功功率和无功功率,能防止储能过度充电并降低储能侧无功输出负担。将上述两种控制方法相结合实现多储能与多光伏间协调运行,协调过程呈现主从关系,通过分析该协调过程,能合理设计网内负荷功耗并引入负荷管理机制。进一步对系统模型进行小干扰稳定性分析可确定控制参数变化对系统的影响。最后,通过基于Rt-lab的硬件在环实验验证了控制策略的有效性。
