Full-range pulse-width modulation charging technology for photovoltaic power generation

Abstract

The invention relates to a full-range pulse-width modulation charging technology for photovoltaic power generation. The full-range pulse-width modulation charging technology comprises a solar component, a switch circuit, a storage battery, an energy-storage capacitor, a central processor and a sampling circuit. Due to the arrangement of the energy-storage capacitor and the adoption of a PWM (pulse-width modulation) control method, the capacitor voltage can be controlled, so that the maximal power point of the solar component can be found out and the tracking of the maximal powder point of a photovoltaic module can be achieved. The charging method of keeping the pulse-width modulation mode all the time in a charging process is achieved, so as to improve the utilization rate of the component and reduce the vulcanization degree of the storage battery, so that the purposes of prolonging the service life of the storage battery and reducing the configuration cost of the component are achieved.

Description

technical field [0001] The invention relates to a full-range pulse width modulation charging technology for photovoltaic power generation, and belongs to the technical field of photovoltaic application control. Background technique [0002] It is predicted that solar photovoltaic power generation will occupy an important seat in the world's energy consumption in the 21st century, not only to replace some conventional energy sources, but also to become the main body of the world's energy supply. It is estimated that by 2030, renewable energy will account for 30% of the total energy structure, and solar photovoltaic power generation will account for 10% of the world's total power supply; by 2040, renewable energy will account for total energy consumption By the end of the 21st century, renewable energy will account for 80% of the energy structure, and solar power will account for 60%. These figures are enough to show the development prospects of the solar photovoltaic industr...

AI Technical Summary

Problems solved by technology

Using DC charging will cause the battery to be full and the battery will gas out, which will affect the service life of the battery

Using three-period charging, although the battery can be fully charged, but because the second and third periods of charging use pulse charging, when the switch circuit [2] is closed, the energy generated by the solar module because the circuit has no intermediate energy storage device is is wasted, resulting in a corresponding increase in system cost when configuring the system

At the same time, regardless of the three-period charging or DC charging, the voltage of the solar cell module cannot be controlled, so that the maximum power point of the solar cell module cannot be tracked at all. Therefore, the known charging method cannot be used in system configuration or later maintenance. achieve better results

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