电网电压对称跌落下的双馈感应风力发电机磁链有源衰减控制  

Flux Active Damping Control of the Doubly Fed Induction Generator under Grid Voltage Symmetrical Dip

作　　者：张禄[1] 金新民[1] 战亮宇[1] 刘京斗[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《电工技术学报》2012年第9期191-197,共7页Transactions of China Electrotechnical Society

基　　金：国家科技支撑计划资助项目(2007BAA12B04)

摘　　要：双馈感应发电机定子与电网直接相连,容易受到电网扰动的影响甚至造成故障停机。电机参数决定了系统具有欠阻尼特性,在电网电压扰动下的磁链暂态振荡时间较长,不利于低电压穿越期间实现快速无功补偿。本文基于双馈感应发电机定转子磁链4阶状态方程,通过求解系统特征根的方法重点分析了定子暂态磁链的衰减速率及其影响因素,提出了一种转子侧变流器磁链有源衰减的改进控制策略,合理控制转子电流加快暂态磁链衰减并消除磁链振荡。仿真和实验结果说明改进控制策略对暂态磁链衰减和降低转子过电压和过电流的良好效果,验证了理论分析的正确性和改进控制策略的有效性。The doubly fed induction generator （DFIG） system is sensitive to the grid disturbance and even breakdown, when the stator is directly connected to the grid during the grid faults. The parameters of DFIG incurs an under damping response and a long time of the transient flux oscillation. It is unfavorable for the fast reactive power compensation during the low voltage ride-through（LVRT）. A fourth-order dynamic d-q model of DFIG is used in the paper. And based on the eigenvalues of the system matrix, the different damping rates of the transient stator-flux and its influence factors are investigated. An improved control strategy with the flux active damping（FAD） control by the rotor side converter（RSC）is presented. The damping rate of the transient flux is accelerated and flux oscillation is eliminated by means of the proper control to the rotor currents. The simulation and experimental results validate the theoretical analysis and the feasibility of the proposed control strategy. The damping rate of the transient flux is accelerated; meanwhile the flux oscillation, overvoltage and overcurrent of the rotor are decreased.

关 键 词：风力发电 双馈感应发电机 低电压穿越 磁链有源衰减 转子侧变流器 

分 类 号：TM310[电气工程—电机]