Continuous fault ride-through control strategy for DFIG low and high voltage based on improved DVR
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动态电压恢复器(Dynamic voltage restorer,DVR)因具有动态响应速度快、补偿精度高的特点被广泛应用于双馈式风电机组低电压故障穿越中,但在低、高压连续故障等复杂工况下易产生控制性能下降问题.针对该问题提出了基于扰动观测器(Disturbance observer,DOB)的改进型DVR故障穿越控制策略,推导了改进型和常规型DVR跟踪性能和抗干扰性能传递函数,通过伯德图对改进前后性能进行了对比分析.改进型DVR在常规型电压-电流双闭环控制基础上引入了扰动观测器和模型逆环节,可有效增强系统抗扰能力,并提升系统跟踪性能.最后,基于PSCAD软件平台建立了2 MW双馈式风电系统模型,在低、高压连续故障工况下,通过时域仿真验证了所提改进故障穿越方法的有效性.
Dynamic voltage restorer(DVR)is widely used in low-voltage fault ride-through of doubly-fed induction generator(DFIG)due to its fast dynamic response speed and high compensation accuracy.However,it is easy to cause control performance degradation under complex conditions such as low and high voltage continuous fault.To solve this problem,an improved DVR fault ride-through control strategy based on disturbance observer(DOB)is proposed.The transfer functions of tracking performance and anti-interference performance of improved and conventional DVR are derived,and the performance before and after the improvement is compared and analyzed by bode diagram.Based on the conventional voltage-current double closed-loop control,the improved DVR introduces into a disturbance observer and a model inverse link,which can effectively enhance the anti-disturbance ability of the system and improve the tracking performance of the system.Finally,a 2 MW DFIG system model is established based on PSCAD software platform.Under low and high voltage continuous fault conditions,the effectiveness of the proposed improved fault ride-through method is verified by time domain simulation.
doubly-fed induction generatordynamic voltage restorerdisturbance observerfault ride-through
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