Method for estimating multi-peak MPPT of photovoltaic array
A technology of photovoltaic arrays and estimated values, applied in photovoltaic power generation, instrumentation, adjustment of electrical variables, etc., can solve problems such as complex algorithms
Inactive Publication Date: 2020-12-29
杜勐
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The existing multi-peak maximum power point tracking method has complex algorithms and requires additional hardware costs
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[0026] In the case of partial shading, when the illumination of different modules in the photovoltaic array is different, the output voltage and current of each module will be different. Figure 1a It is a photovoltaic array U-I characteristic curve composed of 3 strings of battery panels connected in parallel and 5 battery modules connected in series in each string. Among them, the first string of photovoltaic modules receives 5 different types of light, the second string receives 3 types, and the third string receives 2 types. After the 3 strings are superimposed, there are 5 power peaks, such as Figure 1b shown.
[0027] Depend on Figure 1a , 1b It can be seen that the U-I characteristic curve of the photovoltaic array with partial shadows presents multiple steps, and the corresponding power-voltage curve presents multiple peaks. Due to the complex and changeable shadow conditions, in the actual U-I characteristic curve, the height and length of each current step chang...
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The invention discloses a method for estimating multi-peak MPPT of a photovoltaic array. The method comprises the following steps that (1), at least five points are selected for each step according toa maximum possible current step, output voltage is equally divided from open-circuit voltage to 0 according to at least five times of the maximum step number, and each voltage node is taken as a sampling measurement point; (2), the output voltage of the photovoltaic array is scanned from the open-circuit voltage in a sequentially decreasing mode until the output voltage is zero, the number of steps of the U-I characteristic curve, steady current and the length of each step are calculated according to the scanned measurement point information, and the number of the steps is gradually increasedfrom the right side to the left side of the U-I characteristic curve; (3), an estimated voltage is calculated based on the steady current of each step and the length of each step, and a maximum powerpoint power estimated value of each step is calculated; and (4), the maximum power point power estimated values are compared to obtain an interval where a final global peak value is located, and single-peak maximum power point tracking control in the interval is carried out to obtain the maximum power point.
Description
technical field [0001] The invention relates to the photovoltaic field, in particular to a method for estimating the multi-peak maximum power point tracking (MPPT) of a photovoltaic array. Background technique [0002] Because of the nonlinear output characteristics of photovoltaic panels, the maximum output power of photovoltaic arrays changes with changes in light intensity and temperature, so it is very important to perform maximum power point tracking control in photovoltaic power generation. The traditional maximum power point tracking control of photovoltaic cells is mainly aimed at single-peak conditions. However, with the increase of the scale of photovoltaic arrays, the output characteristic curve of the actual photovoltaic array may present multiple local maxima (multi-peaks) when the light is unbalanced. At this time, the traditional single-peak maximum power tracking algorithm is easy to converge to the local peak instead of the global peak, resulting in waste of...
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Login to View More IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 杜猛庆辰·曹陈海华
Owner 杜勐