MPPT Device for Solar Battery Voltage Range Expansion
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Solution Overview
Problem
Conventional solar electric-generation systems are unable to simultaneously track the maximum power point and expand the output voltage range of solar batteries, leading to potential energy wastage due to low conversion efficiency.
Innovation Solution
A maximum power point tracking device and method that includes a sampling module to detect output current and voltage values, a controlling module to calculate target current values, and a driving module to adjust the output current of a DC/DC converter, allowing the solar battery to operate at the maximum power point while expanding the output voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the solar battery operates at the maximum power point, then the conversion efficiency is improved, but the output voltage range is limited
Solution Approach 1:
A DC/DC converter is introduced as an intermediary device between the solar battery and the load. The converter includes an input terminal connected to the solar battery and an output terminal connected to the load, enabling voltage transformation while maintaining maximum power point operation. This mediator allows the system to decouple the solar battery's operating voltage from the load's voltage requirements.
Solution Approach 2:
The system dynamically adjusts the duty cycle parameter of the DC/DC converter to transform voltage. By changing the duty cycle, the converter can output a wider voltage range than the solar battery's limited output voltage, thus expanding the adaptability while keeping the solar battery operating at its maximum power point.
2Device complexity
If conventional solar electric-generation systems are used, then the structure is simple, but energy wastage occurs due to inability to track maximum power point and expand voltage range
Solution Approach 1:
The control module receives feedback signals from the solar battery's output voltage and current, calculates the maximum power point, and adjusts the DC/DC converter's duty cycle accordingly. This closed-loop feedback system ensures continuous tracking of the maximum power point and dynamic voltage adjustment, preventing energy wastage while maintaining manageable system complexity through automated control.
Data Source
AI summary
A maximum-power-point tracking device is provided for a solar electric-generation system that includes a solar battery and a DC/DC converter connected to the solar battery. The device includes a sampling module configured to detect output current and voltage values of the solar battery. A controlling module is configured to calculate a target current value according to the output current and voltage values and a preset current value, and output a controlling signal for controlling the value of a current according to the output current of the solar battery and the target current value. The device also includes a driving module configured to receive the controlling signal from the controlling module and output a driving signal to adjust a output current value of the DC/DC converter to close to the target current value and adjust an output power of the DC/DC converter.