改进Crowbar低电压穿越研究

Research on Improving Low Voltage Ride Through

随着“三型两网”等概念的提出与发展,能源互联时代潮流趋势明显增强。在经济快速发展的同时,越来越多新型能源得到开发。因此,基于双馈风力机组(Doubly Fed Induction Generator,DFIG)的低电压穿越(Low Voltage Ride Through,LVRT),对单台风机中的传统撬棒(Crowbar)保护电路进行改进,提出在Crowbar保护回路中串联电感的DFIG低电压穿越技术。对新改进的单风机撬棒模型进行仿真模拟,结果表明改进的Crowbar电路能够提高单台风机躲避电网故障引起的低电压问题,一定程度上有助于系统在故障瞬态性能下保持稳定,验证了改进方案的可行性。

With the concept of"three types,two networks"and other concepts proposed and developed,the trend of energy interconnection era has increased significantly.With the rapid development of economy,more and more new energy sources have been developed.Therefore,based on the Low Voltage Ride Through(LVRT)of Doubly Fed Induction Generator(DFIG),the traditional crowbar protection circuit in a single fan is improved,and the DFIG low voltage crossing technology with series inductance in the Crowbar protection circuit is proposed.The simulation results of the new improved crowbar model show that the improved Crowbar circuit can improve the single fan to avoid the low voltage problems caused by power grid faults,to a certain extent,help the system to maintain stability under the transient performance of faults,and verify the feasibility of the improved scheme.