双馈感应发电机无锁相环直接功率控制

直接功率控制(DPC)策略由于实施结构简洁、响应速率快等优势,在新能源发电领域得到了广泛的应用,因此提出基于两相静止坐标系的双馈感应发电机(DFIG)无锁相环DPC策略。针对两相静止坐标系中DFIG有功、无功功率动态方程的参数时变特性,构建了DFIG的有功、无功励磁电压2个可控量,并将含有交流电压系数矩阵的DFIG有功、无功功率动态方程变换为常系数动态方程,简化了控制系统设计,并根据DFIG的转子位置角,DFIG转子励磁电压与有功、无功励磁电压间的转换。利用简单线性调节器,即可完成对DFIG有功、无功功率的解耦控制与无差跟踪。最后,通过试验验证了所提控制策略的有效性和频率适应性。

Improved Non-PLL Direct Power Control of Doubly Fed Induction Generator

Direct power control (DPC) is widely used in renewable power generation due to the advantages of simple implementation and fast dynamic response. An improved non-phase-locked-loop (non-PLL) DPC of doubly fed induction generator (DFIG) is proposed, which is implemented in the two phase stationary reference frame. In order to deal with the time varying characteristics of active and reactive powers for a DFIG in the stationary reference frame, the modulated active and reactive voltages are introduced. By this means, the time varying voltage matrix related dynamics of DFIG active and reactive powers are changed into a constant coefficient related equation, thereby simplifying the design of implementation system. Meanwhile, the modulated rotor voltage can be obtained from the modulated active and reactive voltages based on DFIG rotor position angle. Then, a linear controller can be introduced to achieve the decoupling regulation and fast tracking of active and reactive powers. Finally, the experimental results confirm the effectiveness and frequency adaptability of the proposed method.