Direct Power Control of DFIG With Constant Switching Frequency and Improved Transient Performance
Direct Power Control of DFIG With Constant Switching Frequency and Improved Transient Performance
复制标题
DOI：
10.1109/tec.2006.889549
复制
发表时间：
2007-02
影响因子：
4.9
通讯作者：
Dawei Zhi;Lie Xu
中科院分区：
文献类型：
--
作者：
Dawei Zhi;Lie Xu
针对双馈风力涡轮机系统，提出了一种新的直接功率控制策略。根据定子磁链、转子位置、有功功率和无功功率及其相应的误差，直接计算出在每个固定时间段内消除有功功率和无功功率误差所需的转子控制电压。无需额外的功率或电流控制环路，简化了系统设计，并提高了瞬态性能。实现了恒定的转换器开关频率，从而简化了功率转换器和交流谐波滤波器的设计。瞬态过程中的转子电压限制进行了研究，并提出了一个计划，优先考虑有功和无功功率控制，使一个保持完全控制，而另一个的错误是减少。机器参数变化对系统性能的影响进行了研究，发现可以忽略不计。对2MW双馈风力发电机系统的仿真结果表明，该控制策略在有功功率、无功功率、电机参数和风速变化时具有较好的鲁棒性
This paper proposes a new direct power control (DPC) strategy for a doubly fed induction generator (DFIG)-based wind turbine system. The required rotor control voltage, which eliminates active and reactive power errors within each fixed time period, is directly calculated based on stator flux, rotor position, and active and reactive powers and their corresponding errors. No extra power or current control loops are required, simplifying the system design, and improving transient performance. Constant converter switching frequency is achieved that eases the design of the power converter and the ac harmonic filter. Rotor voltage limit during transients is investigated, and a scheme is proposed that prioritizes the active and reactive power control such that one remains fully controlled while the error of the other is reduced. The impact of machine parameter variations on system performance is investigated and found negligible. Simulation results for a 2 MW DFIG system demonstrate the effectiveness and robustness of the proposed control strategy during variations of active and reactive power, machine parameters, and wind speed