基于可变撬棒电阻的双馈风机低电压穿越优化控制方法  

A Low Voltage Ride-Through Control Method Based on Variable Crowbar Resistance for Doubly Fed Induction Fan

作　　者：张军民 ZHANG Junmin(Ministry of Energy and Environmental Protection of Baowu Group Echeng Steel Co.,Ltd.,Ezhou 436000,China)

机构地区：[1]宝武集团鄂城钢铁有限公司能源环保部,湖北鄂州436000

出　　处：《电工技术》2021年第5期162-165,共4页Electric Engineering

摘　　要：电网故障时,DFIG并网点电压的跌落深度影响着机组的暂态特性,进而决定着机组应采用的低电压穿越策略(LVRT)。此外,LVRT性能在一定程度上依赖于控制参数的选取,据此提出由电压跌落程度匹配低电压穿越策略的方案。首先根据故障距离对DFIG并网点电压进行分类并形成相应的LVRT优化策略;然后用粒子群算法优化控制系统参数后形成参数表,故障瞬间通过判断故障距离即可匹配合适的LVRT方案和最优控制参数;最后在PSCAD/EMTDC上建模仿真,结果表明所提方案有效提高了DFIG应对故障的灵活性,减小了故障对机组的不良影响,降低了无功损耗,总体上LVRT效果更佳,更具有实际意义。When the power grid fails,the depth of the voltage drop at the DFIG grid connection point affects the transient characteristics of the unit,which in turn determines the low voltage ride-through(LVRT)strategy that the unit should adopt.In addition,LVRT performance depends to a certain extent on the selection of control parameters.Based on this,a scheme is proposed to match the low voltage ride through strategy by the degree of voltage sag.Firstly,according to the fault distance,the voltage of DFIG parallel node is classified and the corresponding LVRT optimization strategy is formed.Then the parameters of the control system are optimized by particle swarm optimization algorithm to form a parameter table,and the appropriate LVRT scheme and optimal control parameters can be matched by judging the fault distance at the moment of fault.Finally,the model is built and simulated on PSCAD/EMTDC.The results show that the proposed scheme can effectively improve the flexibility of DFIG to deal with the fault,reduce the adverse impact of the fault on the unit,and reduce the reactive power loss.On the whole,the LVRT effect is better and has more practical significance.

关 键 词：双馈风机 低电压穿越 微粒群优化 

分 类 号：TM315[电气工程—电机]