PV Microgrid Capacity Sensor Using Test Loads
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Solution Overview
Problem
In developing countries, the lack of reliable and affordable energy access leads to reliance on biomass cooking, which has severe health, environmental, and economic impacts, while current alternative fuel technologies are not adequately adopted due to high costs and infrastructure requirements.
Innovation Solution
A renewable energy microgrid system with a minimal energy buffer, utilizing photovoltaic (PV) panels and a method to determine real-time capacity by monitoring current into and out of a small battery storage, allowing efficient and reliable distribution of power, especially for cooking, by applying test loads and measuring charging status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a renewable energy microgrid with minimal energy buffer is used, then cost is reduced and environmental harm is minimized, but reliability of power supply deteriorates
Solution Approach 1:
The system performs preliminary capacity testing by applying test loads before actual power distribution to determine the real-time capacity of the PV microgrid. This advance measurement allows the system to reliably determine available power capacity without requiring large energy buffers, thus maintaining reliability while minimizing storage costs
Solution Approach 2:
The system continuously monitors current into and out of the minimal energy buffer to provide real-time feedback on charging status and available capacity. This feedback mechanism enables dynamic adjustment of power distribution based on actual PV generation capacity, ensuring reliable operation with minimal storage
2Adaptability or versatility
If a photovoltaic microgrid with real-time capacity monitoring is deployed, then accessibility of energy is improved, but device complexity increases
Solution Approach 1:
The PV microgrid system performs self-testing and self-characterization by automatically applying test loads and measuring its own real-time capacity. This self-service approach eliminates the need for external complex monitoring infrastructure, making the system more accessible while keeping device complexity manageable
Solution Approach 2:
The test load component serves multiple functions: it characterizes PV capacity, determines available power, and validates system operation. This multi-functionality reduces the need for separate dedicated measurement devices, thereby reducing overall device complexity while improving energy accessibility
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides clean, low-cost electricity and reduces the need for battery storage, enabling the PV microgrid to efficiently and reliably supply power during the day, promoting adoption and use of renewable energy while minimizing costs and environmental harm.
Implementation Method 1
renewable energy microgrid including a photovoltaic (PV) microgrid
Data Source
AI summary
In one aspect, a method to determine a capacity of a microgrid includes applying a current test load to the microgrid and measuring a current through an energy storage device, the current indicating a charging status of the energy storage device based on a current load being applied to the microgrid through activated power outlets being served by the microgrid and the current test load, the energy storage device being integrated with the microgrid. The method also includes, responsive to a determination that the measured current based on the current load being applied to the microgrid and the current test load indicates that the energy storage device is discharging, determining the capacity of the microgrid, wherein the capacity is the current load being applied to the microgrid through activated power outlets and a test load applied to the microgrid immediately preceding the current test load.