Maximum power tracking and controlling method of single-stage photovoltaic system
A maximum power tracking, photovoltaic system technology, applied in control/regulation systems, optical radiation generators, instruments, etc., can solve the problems of photovoltaic array energy loss, high tracking accuracy, and can not guarantee the global maximum power point, etc., to achieve tracking Fast, high tracking accuracy
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[0054] 3. Example 3—the photovoltaic array output power-voltage characteristic curve has 3 peaks
[0055] Such as Figure 4 As shown, the power voltage characteristic curve of a photovoltaic array has 3 peaks in the case of shadow occlusion, and the standard environmental conditions, that is, the light intensity is 1kW / m 2 And the open circuit voltage U of the photovoltaic array at 25°C oc=740V, as can be seen from the figure: the method of the present invention first starts tracking from the initial point A3 (37.0V, 361.6W), that is, from the left side of the output power-voltage characteristic curve of the photovoltaic array. Since point A3 is far away from the peak, the photovoltaic array The differential of the output power to the voltage, that is, the slope of the output power-voltage characteristic curve of the photovoltaic array is relatively large, and C increases from the formula (4), the iteration step size C×k(i) is relatively large, and the maximum power convergen...
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