基于电池储能和Crowbar的风力发电机低电压穿越控制的研究

摘要

文章提出一种基于电池储能和Crowbar协调控制提高DFIG的LVRT能力的策略.在系统电压小幅跌落时,电池储能系统,通过PQ解耦PI控制,适当调节交流侧输出电压幅值和相位,以提供满足系统电压稳定的无功功率;当系统电压大幅跌落时,电池储能协同Crowbar电路的投切控制,及时卸荷多余能量并保护变流器,保证DFIG在故障期间不脱网运行.在PSCAD/EMTDC平台对本文提出的控制策略进行仿真,结果表明本文的控制策略能在系统电压在大幅深度跌落情况下,使DFIG具备LVRT能力.%This paper studies the basic principle of wind turbine LVRT based on battery energy storageis system (BESS) introduced, then a control strategy integrating BESS and Crowbar crowbar circuit is proposed to implement increase LVRT capability. When the system voltage dips slightlya little, BESS adjusts the amplitude and phase of the AC side output appropriately to provide reactive power to recover the system voltage dip by PQ decoupling PI control to provide reactive power to recover the system voltage; When the system voltage dips sharplya lot, adopting a coordinated control of BESS and Crowbar crowbar circuit is adopted to implement LVRT.Timely, , and to dump the superabundant energy and to protect power inverter. Finally, DFIG and LVRT simulation model is established by PSCAD / EMTDC, the result shows that the strategy enable DFIG LVRT capability under different voltage dip cases.