无刷双馈电机故障穿越策略

电网电压故障会对电机定、转子的电压电流造成冲击,对电网安全造成影响.为研究无刷双馈发电机在电网故障期间的特性并设计对应的控制策略,本文分析了无刷双馈电机定子控制绕组的等效模型和阻尼特性,提出在电流内环控制器引入虚拟电阻的控制策略,该方法能有效抑制控制绕组电压电流瞬态响应的振荡,加快响应时间;对不平衡故障,本文分析了故障...

Brushless doubly fed generator fault ride-through strategy

When the grid voltage fails,it will impact the generator stator,rotor voltage and current,and will affect the grid security.In order to study the characteristics of brushless doubly-fed generators during grid faults and design the corresponding control strategies,this paper analyzes the equivalent model and damping characteristics of the control windings of brushless doubly-fed generator,and proposes a control strategy of introducing virtual resistance into the current inner loop controller,which can effectively suppress the oscillation of the voltage and current transient response of the control winding and speed up the response time.For asymmetrical faults,the influence of each component was analyzed,the positive and negative sequence rotating reference frames were introduced,the negative sequence component in the control target was eliminated,which ensure uninterrupted operation of the unit during the fault.Simulations and experiments show that brushless doubly-fed motors can be passed through a grid fault without a crowbar circuit.