A Maximum Power Tracking Method for Photovoltaic System Based on Virtual Resistance Control
A technology of maximum power tracking and virtual resistance, which is applied in control/regulation systems, photovoltaic modules, photovoltaic power generation, etc., and can solve problems such as inability to achieve better tracking effects and voltage oscillations
Inactive Publication Date: 2016-04-06
ANHUI EHE NEW ENERGY TECH
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This active perturbation method is suitable for Figure 4 (a) The characteristic curve of the photovoltaic array shown in (a), but if the solar cell fill factor is larger, for example, the output characteristic of the photovoltaic array is closer to 1, such as Figure 4 (b) is close to a rectangle, this method will produce voltage oscillations and cannot achieve a good tracking effect
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[0016] A method for maximum power tracking of a photovoltaic system based on virtual resistance control, comprising the following steps:
[0017] (1) Change the value of the output current and output voltage at the working point of the photovoltaic array. The ratio of the output voltage to the current is the output equivalent resistance value of the working point of the photovoltaic array, that is, the virtual resistance value. The output equivalent resistance value is calculated in real time, and the closed-loop tracking virtual Resistance value, when the system is stable, the equivalent resistance value of the load is the virtual resistance command value;
[0018] (2) Change the output power of the photovoltaic array operating point by changing the virtual resistance command value, and compare and judge the change direction of the virtual resistance command value (whether it is increasing or decreasing) according to the trend of the photovoltaic array output power chang...
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The invention discloses a method for tracking the maximum power of a photovoltaic system based on virtual resistance control. According to the feature that the system operating point is the intersection of the IV curve of the photovoltaic array and the characteristic of the load matching resistance, the load matching resistance characteristic of the photovoltaic array is changed through a virtual resistance control algorithm. , change the output power of the array, use the combination of hill-climbing method and dichotomy method to judge and search the maximum power point of the photovoltaic array, and realize fast maximum power tracking control of the photovoltaic array. The method of the invention is suitable for maximum power tracking of various characteristic curves of photovoltaic arrays.
Description
technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a maximum power tracking method of a photovoltaic system based on virtual resistance control. Background technique [0002] The output power of a photovoltaic array is strongly nonlinear and is closely related to meteorological conditions such as sunlight intensity and ambient temperature. Under a certain ambient temperature and different sunlight intensities, the current-voltage (I-V) and power-voltage (P-V) characteristic curves of the photovoltaic array are as follows: figure 1 (a) and figure 1 (b) shown. Depend on figure 1 (b) It can be seen that under a certain sunlight intensity and ambient temperature, the output power of the photovoltaic array can reach the maximum value only when the photovoltaic array operates at a certain voltage (corresponding to a certain resistance value). The working point reaches the highest point of the output PV curve, ...
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IPC IPC(8): G05F1/67H02J3/38H02S40/30
CPCY02E10/56
Inventor 瞿晓丽朱国军彭凯张永马志保姚俊黄才能谢富华
Owner ANHUI EHE NEW ENERGY TECH