摘要
储能及其变换器在微网并网时控制微网与电网的能量交换,离网时保障微网内部敏感负荷供电。通过建立储能逆变器并网/离网控制系统仿真模型研究了并网/离网切换控制策略。对于主动离网过程,提出了一种平滑无过渡过程的切换控制方法;对于被动离网过程,提出了一种基于滞环电流控制的切换控制方法;对于并网切换过程,研究了存在初始相位差的切换控制方法。建立了系统仿真模型,并对3种切换过程进行了仿真,仿真结果表明,所提切换控制方法实现了无冲击无缝切换,能够保障微网中敏感负荷的供电质量。
Energy storage device and converter oversee the power exchanges when the microgrid is connected to the grid and guarantee the power supply of the local sensitive load when the microgrid is disconnected from the grid.The inverter＇s control model is established under the grid-connected and grid-disconnected state respectively,and the control strategy of grid-connected/grid-disconnected seamless transfer is studied.Interms of active disconnection,a smooth transfer strategy is proposed.In regard to passive disconnection,a transfer strategy based on hysteresis current loop control is proposed which can shorten the transfer process and reduce the transient current impact.If there is phase difference between the grid and the inverter when connection operation is needed,the method proposed in this paper can solve this problem perfectly.Finally,system simulation model is constructed,and three kinds of transfer process are simulated.Simulation results verify the methods proposed in the paper can realize no impact seamless transfer,and can enhance also the power quality for local sensitive load.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2014年第11期1-6,27,共7页
Proceedings of the CSU-EPSA
基金
国家自然科学基金重点项目(50837003)
国家自然科学基金项目(51277083)资助项目
关键词
微网
储能
电能质量
并网/离网切换
无缝切换
microgrid
energy storage
power quality
grid-connected/grid-disconnected transfer
seamless transfer
