Maximum power point tracking control method and system thereof of photovoltaic electrical energy optimization
A maximum power point and electric energy optimization technology, applied in control/regulation systems, photovoltaic power generation, photovoltaic modules, etc., can solve the problem that the incremental conductance method cannot track the maximum power point in a timely and effective manner
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[0065] First embodiment
[0066] image 3 with Figure 4 These are the schematic diagrams and schematic diagrams of the principles of the maximum power point tracking control method of this embodiment, and reference is made below figure 1 , image 3 with Figure 4 This embodiment will be described in detail.
[0067] The embodiment of the present invention is applied to the direct current / direct current (DC / DC) conversion stage of a photovoltaic power optimization system. Since the control of the photovoltaic power optimization system is switch control, specifically, by changing the duty cycle used to control the DC conversion stage switch Recently, the size of the reference voltage is controlled to track the maximum power point. The relationship between the output voltage and the input voltage and the duty cycle is different due to the structure of the DC conversion stage. E.g Figure 7 Schematic diagram of the structure, the relationship between voltage and duty cycle is U o / U ...
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[0124] Second embodiment
[0125] Figure 5 It is a schematic flow chart of the maximum power point tracking control method according to the second embodiment of the present invention. The embodiment will be described in detail below with reference to the drawings.
[0126] For ease of description, the same steps as those in the foregoing embodiment will not be expanded in detail, but only the differences from the foregoing embodiment will be described. in Figure 5 Here, the same reference numerals are used for steps that are the same as or similar to those in the foregoing embodiment.
[0127] It should be noted that when the external light intensity or the environment changes, the output power of the photovoltaic module and the change of the output voltage are generally proportional, that is, when the light intensity increases or decreases, dP PV / dV PV Is always greater than zero, according to formula (2), when the light intensity changes suddenly, dV PV / dI PV >0 always hol...
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[0140] The third embodiment
[0141] Image 6 It is a schematic flowchart of a maximum power point tracking control method according to the third embodiment of the present invention. This embodiment is a modification of the first embodiment and the second embodiment, and the first embodiment and the second embodiment are combined. Such as Image 6 As shown, the operation content of step 230 in the second embodiment is not executed after the operation content of step 540 in this embodiment (determining whether it is an environmental mutation) is completed, but the operation content of step 420 that is the same as the first embodiment is executed. , By determining whether the slope H is at the preset error threshold e to control the maximum power output.
[0142] This embodiment first judges the change of the external environment according to the second embodiment, and then performs the maximum power point tracking control according to the maximum power point tracking control method...
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