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Effect of DFIG on Stability of a Weak Grid

采用半功率法计算阻尼率，避免人工计算带来的误差(Calculated using half-power damping rate, to avoid the error caused by manual calculation)

说明：  用matlab仿真的信号的fft变换的时域,频域图形(simulation using Matlab Signal fft transform in time domain, frequency domain graph)

在过程控制中，按偏差的比例（P）、积分（I）和微分（D）进行控制的PID控制器（亦称PID调节器）是应用最为广泛的一种自动控制器。(In process control, according to the percentage of deviation (P), Integral (I) and differential (D) control of PID controller (also known as PID regulators) is the most widely used of an automatic controller.)

单级倒立摆二级倒立摆simulink model and mutiple control aglorithms Full order observer Full order observer with Kalman filter Poleß Placement method LQR optimization(Single-stage inverted pendulum inverted pendulum simulink model and mutiple control aglorithms Full order observer Full order observer with Kalman filter Poleß Placement method LQR optimization)

粒子群算法，用于函数优化问题，也可以求得最短路等问题。(Particle Swarm Optimization)

in this file is distributed system in two case

精通MATLAB 张志涌编著（Matlab入门经典教程），适用于初学者。(Proficient in MATLAB (Matlab Getting Started classic), suitable for beginners.)

说明：  一个非常不错的savitzkyGolay工具包 并有详细的帮助说明 功能强大(SavitzkyGolay a very good kit and a detailed description of the powerful help)

异步电机磁场定向电压矢量控制系统，转速环，磁链环，双电流环可以很好跟踪给定值。转矩波动很小。(Voltage field oriented induction motor vector control system, speed loop, flux loop, double loop current setpoint tracking well. Torque ripple is very small.)