考虑转矩失衡的定子Crowbar双馈风电机组的低电压穿越技术研究  

Study of low voltage ride-through for doubly fed wind generator considering torque imbalance of stator Crowbar

作　　者：周士琼[1] 王倩[1] 吕潇[1] 郝勇奇 倪亚玲 刘东霖 ZHOU Shi-qiong WANG Qian LV Xiao HAO Yong-qi NI Ya-ling LIU Dong-lin(School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China School of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China State Grid Tianfu Electric Power Supply Company, Chengdu 610041, China)

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]电子科技大学机械电子工程学院,四川成都611731 [3]国网天府新区供电公司,四川成都610041

出　　处：《电工电能新技术》2017年第6期22-29,共8页Advanced Technology of Electrical Engineering and Energy

摘　　要：针对故障期间定子Crowbar阻抗计算仅考虑抑制转子侧过电流而忽略风机转速加速问题,提出了一种考虑转矩失衡的定子Crowbar双馈风电机组低电压穿越技术。电网发生故障时,考虑系统间存在不平衡转矩,求解了使风电系统稳定的临界定子Crowbar电路阻抗并结合定子电流跟踪控制策略间接控制风电机组输出功率。仿真分析表明,所提控制方案在确保实现双馈风电机组低电压穿越的同时,能够有效地降低转子暂态电流、超速风险及稳定直流母线电压,并向电网提供无功功率及故障后较快的有功功率恢复速度。In view of that in calculation of impedance of stator crowbar during fault condition only the suppressing of the over current of rotor side is considered but ignoring the acceleration of fan speed, the paper presents a scheme of low voltage ride through technique for the doubly fed wind turbine generator considering the stator crowbar torque imbalance. When the fault occurs in the grid, the imbalance of torque in the system may occur. In the presented scheme, the critical crowbar impedance is found to stabilize the system and the output of the wind turbine is indi- rectly controlled by the control strategy of tracking the stator current. The simulation shows that the proposed control scheme can ensure the realization of low voltage ride-through for the doubly-fed wind turbine generator, and at the same time it can reduce the rotor transient current and the speeding risk, also the DC bus voltage can be stabilized and reactive power is provided to the grid, thus making fast recovery of the system possible after fault.

关 键 词：双馈风电机组 定子Crowbar 临界稳定阻抗 定子电流跟踪控制 低电压穿越 

分 类 号：TM614[电气工程—电力系统及自动化]