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Efficiency Optimization of a DSP-Based Standalone PV System Using Fuzzy Logic and Dual-MPPT Control

机译:基于模糊逻辑和双MPPT控制的基于DSP的独立光伏系统的效率优化

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This paper presents a new digital control scheme for a standalone photovoltaic (PV) system using fuzzy-logic and a dual maximum power point tracking (MPPT) controller. The first MPPT controller is an astronomical two-axis sun tracker, which is designed to track the sun over both the azimuth and elevation angles and obtain maximum solar radiation at all times. The second MPPT algorithm controls the power converter between the PV panel and the load and implements a new fuzzy-logic (FLC)-based perturb and observe (P&O) scheme to keep the system power operating point at its maximum. The FLC-MPPT is based on a voltage control approach of the power converter with a discrete PI controller to adapt the duty cycle. The input reference voltage is adaptively perturbed with variable steps until the maximum power is reached. The proposed control scheme achieves stable operation in the entire region of the PV panel and eliminates therefore the resulting oscillations around the maximum power operating point. A 150-Watt prototype system is used with two TMS320F28335 eZdsp boards to validate the proposed control scheme performance.
机译:本文提出了一种采用模糊逻辑和双最大功率点跟踪(MPPT)控制器的独立光伏(PV)系统的新数字控制方案。第一个MPPT控制器是一个天文两轴太阳跟踪器,其设计用于在方位角和仰角上跟踪太阳,并始终获得最大的太阳辐射。第二种MPPT算法控制PV面板和负载之间的功率转换器,并实现了一种新的基于模糊逻辑(FLC)的扰动观察(P&O)方案,以将系统功率工作点保持在最大。 FLC-MPPT基于具有离散PI控制器的功率转换器的电压控制方法,以适应占空比。输入参考电压会以可变步长自适应适应,直到达到最大功率为止。提出的控制方案可在PV面板的整个区域实现稳定的运行,因此消除了在最大功率工作点附近产生的振荡。一个150瓦的原型系统与两个TMS320F28335 eZdsp板一起使用,以验证所提出的控制方案性能。

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