Secondary booster circuit for boosting voltage based on MPPT (maximum power point tracking) and distributed solar battery pack

Abstract

The invention discloses a secondary booster circuit for boosting voltage based on MPPT and a distributed solar battery pack. The secondary booster circuit for boosting voltage based on MPPT is characterized in that the output power after secondary voltage boosting is stable in a certain period of time by using a super capacitor and a charging balance module, and the output power can be stabilized by further using the super capacitor. The distributed solar battery pack comprises a battery pack consisting of N single solar panels (11 to 1n) in parallel connection, front-end circuits (21 to 2n) of the secondary booster circuit for boosting voltage based on MPPT, an inverter (3), a power network module, an external connector (5) and a communication bus, wherein each solar panel is in parallel connected with the front-end circuit. In comparison with the prior art, the distributed solar battery pack provided by the invention can prevent breakdown of the solar battery pack resulting from the heat island effect, and can ensure high power generation efficiency of the solar battery pack.

Description

technical field [0001] The invention relates to a high-efficiency solar battery pack applied to a solar power generation system, in particular to a design of a solar battery pack based on a secondary boost circuit for MPPT boosting. Background technique [0002] In a solar power generation system, it is necessary to first increase the low-voltage alternating current generated by the solar panel to a voltage matching that of the AC mains, and then convert the direct current into an AC positive wave, which is synchronized with the mains and then incorporated into the grid. The method commonly used at present is to form a solar cell group after connecting hundreds to one thousand solar cells in series, so that a voltage of one hundred volts to five hundred volts can be obtained. However, the series solar cell group in this prior art is formed by parallel connection of N strings of solar cell panels, and each string of solar cell panels is freely connected by a connector, so as ...

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Problems solved by technology

[0003] 1) When a single board in a string of solar panels is broken, the entire string of solar panels needs to be removed, which affects the power generation of solar energy;

[0004] 2) This design seems simple, but in fact, due to the mismatch of solar cells and different use environments, the output current of the solar cell group with low output voltage is small, and more electric energy is turned into heat energy, which makes the solar cell heat up and forms a heat island. , causing damage to the solar cell

[0006] However, the main problem with the above design is that due to the high output voltage, the resulting switching losses also increase

But in the morning and evening or when it is cloudy, the output power of the solar panel is only 30 watts, and the conversion efficiency at this time drops to 53%.

Such a system is unacceptable

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