基于定子电流正弦化的双馈风电系统低电压穿越强励控制

发布时间：2018-07-28 13:59

【摘要】：基于Crowbar电路的低电压穿越实现了双馈风电机组的系统保护和不脱网运行。Crowbar电路的应用使得网压跌落时转子变流器闭锁,转子电流处于暂态过程。针对采用Crowbar电路实现低电压穿越过程中,双馈风电机组系统对电网产生暂态电流冲击而存在的不足,文中提出一种基于转子电流源控制的低电压穿越强励控制策略,通过强励实现低电压穿越过程定子暂态直流磁链分量的补偿,以实现低电压穿越过程中定子电流的正弦化。由于在静止坐标系中引入直流磁链补偿,在转子dq旋转坐标系控制方程中引入了工频交流分量,因此文中提出了一种基于多分量增益的比例谐振(PR)并联调节器,并通过该并联调节器的闭环传递函数分析对调节器参数进行整定,实现了控制带宽范围内直流电流分量与工频交流电流分量的无静差控制。仿真及实验结果验证了理论分析的正确性,为双馈风电系统的低电压穿越控制提供了一种高性能的控制策略。
[Abstract]:The low voltage traversing based on Crowbar circuit realizes the system protection of doubly-fed wind turbine and the application of .Crowbar circuit, which makes the rotor converter lock and the rotor current in transient process when the grid voltage drops. In this paper, a low voltage traversing strong excitation control strategy based on rotor current source control is proposed to overcome the shortcomings of the transient current impulse caused by the doubly-fed wind turbine system in the process of low voltage traversing using Crowbar circuit. The stator transient DC flux component compensation is realized by strong excitation in order to realize the sinusoidal stator current in the low voltage traversing process. Because DC flux compensation is introduced in static coordinate system and power frequency AC component is introduced into the control equation of rotor dq rotating coordinate system, a proportional resonant (PR) parallel regulator based on multi-component gain is proposed in this paper. Through the closed-loop transfer function analysis of the parallel regulator, the regulator parameters are adjusted to realize the no-static error control of the DC current component and the power frequency AC current component in the control bandwidth. The simulation and experimental results verify the correctness of the theoretical analysis and provide a high performance control strategy for the low voltage traversing control of the doubly-fed wind power system.
【作者单位】：东南大学电气工程学院;国电南京自动化股份有限公司;
【基金】：江苏省自然科学基金资助项目(BZ2008306)~~
【分类号】：TM614

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