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Adaptive Observer-based Control Strategy for Maximum Power Point Tracking of Uncertain Photovoltaic Systems

机译：不确定光伏系统最大功率点跟踪的基于自适应观测器的控制策略

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This work presents an adaptive observer-based control strategy for maximum power point tracking (MPPT) of uncertain photovoltaic (PV) systems. On the one hand, the PVG output voltage and/or current measurements are needed for MPPT techniques and controllers design and, on the other hand, the PV arrays have to be installed in a site that profits from good daily sunshine. This obviously leads to difficulty of PVG output current and voltage measurement if ever such a site is at great distance from the converter. Furthermore, the MPPT control accuracy could be significantly affected due to the cable parameters if only voltage and current measurements on the converter side of the cable are instead used. To overcome this issues, an adaptive extended Kalman–like observer providing estimates of PVG output current and voltage regardless of cable resistance and inductance deviations, is first designed. Afterwords, a backstepping controller is synthesized to ensure the MPPT objective. The designed adaptive observer-based MPPT control convergence is formally analyzed and its effectiveness in compensating for cable parameters uncertainties on the MPPT accuracy is validated through numerical simulations.
机译：这项工作提出了一种不确定的光伏（PV）系统的最大功率点跟踪（MPPT）的基于观测器的自适应控制策略。一方面，对于MPPT技术和控制器设计，需要测量PVG输出电压和/或电流，另一方面，必须将PV阵列安装在可从每天良好的日照中获利的地点。如果这样的地点离转换器很远，显然会导致PVG输出电流和电压测量的困难。此外，如果仅使用电缆转换器侧的电压和电流测量值，则MPPT控制精度可能会因电缆参数而受到显着影响。为了克服这个问题，首先设计了一种自适应扩展的类似Kalman的观察器，无论电缆电阻和电感偏差如何，都能提供PVG输出电流和电压的估计值。后言，合成了反推控制器以确保MPPT目标。正式分析了基于自适应观测器的MPPT控制收敛性，并通过数值仿真验证了其在补偿电缆参数对MPPT精度不确定性方面的有效性。

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