The Doubly Fed Induction Generator based Wind Turbine (WT-DFIG) suffers from instability while steady-state operation if improperly controlled. This paper proposes and evaluates three Scalar strategies that ensure Maximum Power Point Tracking (MPPT) and stabilize the WT-DFIG.

Both of the generator electromagnetic torque – speed and the wind turbine mechanical torque-speed characteristics are taken into account. The DFIG steady-state stabilized MPPT characteristic is first examined and evaluated in conjunction with the ratio of the stator voltage to rotor voltage magnitude. Then a scalar control strategy based on Rotor Voltage and Frequency Magnitude Control (RVFMC) function as related to the selected stator voltage is proposed. Stabilized MPPT for any specified speed range at different operating conditions are presented. For DFIG steady state instability declaration, its developed torque is defined in forms of two main components, specified as induction torque components and synchronous torque components. The induction torque impacts on stability while MPPT at steady state is presented, and further approved by the WT-DFIG MPPT dynamic model. The three Scalar MPPT control algorithms are constructed based on a constrained Rotor Voltage Angle (RVA). The first one deal with maximizing the synchronous developed power (MSP), the second strategy optimizes the synchronous power to achieve higher stability at higher power capability (OSP) and the third strategy deals with gaining higher power at maximum efficiency (ME). The RVA is the shift angle with the stator voltage which may be considered as a load angle has been defined for each algorithm. Detailed performance characteristics are presented, compared and evaluated to recognize the gained power ratio, stability, and efficiency enhancement. The proposed techniques implementation is explained; the RVC controller design and a simplified block diagram of the prescribed independent voltage and frequency reference generator block diagram are provided.

如果控制不当，则基于双馈感应发电机的风力涡轮机（WT-DFIG）会处于不稳定状态，而稳态运行时会出现故障。本文提出并评估了三种标量策略，这些策略可确保最大功率点跟踪（MPPT）和稳定WT-DFIG。

发电机的电磁转矩-转速和风力发电机的机械转矩-转速特性都被考虑在内。首先结合定子电压与转子电压幅值的比率来检查和评估DFIG稳态稳定的MPPT特性。然后提出了基于转子电压和频率幅值控制（RVFMC）函数的标量控制策略，该策略与所选择的定子电压有关。给出了在不同运行条件下任何指定速度范围内的稳定MPPT。对于DFIG稳态不稳定声明，其产生的转矩以两个主要成分的形式定义，分别指定为感应转矩成分和同步转矩成分。呈现稳定状态下的MPPT时，感应转矩会影响稳定性，并由WT-DFIG MPPT动态模型进一步批准。基于约束转子电压角（RVA）构造了三种标量MPPT控制算法。第一个策略涉及最大化同步开发功率（MSP），第二个策略优化同步功率以在更高功率容量（OSP）下实现更高的稳定性，而第三个策略则涉及以最大效率（ME）获得更高的功率。RVA是带有定子电压的偏移角，可以为每种算法定义该角度。呈现，比较和评估详细的性能特征以识别获得的功率比，稳定性和效率增强。解释了建议的技术实现；