Control method of pre-stage voltage regulation solar mppt system based on final power feedback

Abstract

The invention provides a preceding-stage voltage-regulating type solar MPPT (maximum powder point tracking) system based on final powder feedback and a control method. The preceding-stage voltage-regulating type solar MPPT system comprises a solar battery pack, a DC (direct current)-DC module, energy storage equipment and an MCU (microprogrammed control unit) module, wherein the energy storage equipment is connected with an output end of the DC-DC module; an input end of the MCU module is connected with a sensor which is used for detecting the output voltage and the output current of the solar battery pack and the output voltage and the output current of the DC-DC module; a super-capacitor assembly is connected between the solar battery pack and the DC-DC module; two ends of the super-capacitor are respectively connected with an anode and a cathode of the solar battery pack; and a sensor which is used for detecting the voltage and the current of the output side of the super-capacitor assembly is connected with the MCU module. The preceding-stage voltage-regulating type solar MPPT system based on final power feedback and the control method have the advantages that influences of the conversion efficiency factor of a DC / DC circuit between the solar battery pack and a charging load and the direct outputting voltage of the solar battery pack on output power are considered when a solar maximum power tracking method is carried out, the preceding-stage voltage-regulating type solar MPPT system based on final powder feedback and the control method are designed, and the energy conversion efficiency of solar batteries is improved.

Description

technical field [0001] The invention relates to a tracking algorithm of solar power generation, in particular to a control method of a pre-stage voltage regulating solar MPPT system based on final power feedback. Background technique [0002] With the rapid development of social economy, the global energy consumption is also increasing rapidly year by year, which leads to more and more serious environmental pollution and promotes the upsurge of research on new energy sources. Among the various new energy sources at present, solar energy has been highly valued by people due to its advantages of being renewable, non-polluting, and wide geographical distribution. Therefore, solar power generation, as a very effective utilization method, has also developed rapidly. However, in the process of utilizing solar energy, there are still problems such as high cost, low conversion efficiency, and inconvenient utilization. Maximum Power Point Traeking (MPPT for short) technology can eff...

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Problems solved by technology

[0004] However, when the above algorithm tracks the maximum power point, it is based on the direct output power of the solar battery pack as the judgment basis, and the energy actually stored in the energy storage device or transmitted to the grid is output after DC / DC conversion Energy, there are also issues such as DC / DC circuit conversion efficiency between the two, and the efficiency changes at different input and output voltages and currents, so the maximum power point obtained by the above algorithm is not the maximum power point ultimately used by the system

[0005] In addition, after testing some existing algorithms, it is found that the final charging power of the energy storage system (such as battery packs, etc.) will increase with the increase of the direct output voltage of the solar battery pack, but the existing algorithms do not consider to this point

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