非线性UKF估计在光伏MPPT中应用研究

Application research of nonlinear UKF estimate in photovoltaic system MPPT

非线性无迹卡尔曼滤波(UKF)估计用采样策略逼近非线性分布的方法,在光伏系统最大功率点跟踪(MPPT)中采用大步长扰动观察法定位最大功率点的电压范围;在该电压范围用尽量小步长的控制电压,以相应的瞬时功率作为被估量,利用UFK精确估计,经过功率比较定位出最大功率点及其相应的控制电压,通过状态检测判断出状态突变。通过仿真验证了所提策略的正确性、有效性。

Nonlinear unscented Kalman filter estimate （UKF） is the method of sampling strategy approximating nonlinear distribution.The maximum power point voltage range was posted by large step perturbation ＆ observation method in the maximum power point tracking （MPPT） of photovoltaic system.Using as small as possible step control voltage in the voltage range,the instantaneous power was estimated by UKF,and the maximum power point and its corresponding control voltage were posted by power comparison.The mutation status was detected by state detection.The correctness and effectiveness of the strategy is verified by simulation.