Solar PV Load Management via Relay Switching
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Solution Overview
Problem
Renewable energy systems, such as solar power systems, face inefficiencies due to intermittent power generation, leading to suboptimal utilization of energy sources, and existing load management systems rely on photodetectors that are prone to inaccuracies from temperature and environmental variations.
Innovation Solution
A load management system that uses a power sensor to measure power output before and after switching loads, eliminating the need for a photodetector by comparing these values to determine optimal load connections and disconnections, thereby tracking the maximum power point without power conditioning electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power conditioning electronics are used to manage and condition PV power output, then power delivery control is improved, but system cost and complexity increase
Solution Approach 1:
The patent extracts and eliminates the power conditioning electronics from the system by implementing a direct-coupled architecture where PV arrays are directly connected to loads through relays. The control function is separated from the power path, using a microcontroller to monitor power output and control relay switching without requiring intermediate power conversion stages.
Solution Approach 2:
The patent replaces electronic power conditioning systems with a mechanical relay-based switching system. Relays are used to connect and disconnect loads from the PV array based on power level thresholds, substituting complex electronic power management with simpler mechanical switching controlled by power threshold comparisons.
2Productivity
If photodetectors are used to track maximum power point, then power optimization is improved, but measurement accuracy deteriorates due to temperature and environmental variations
Solution Approach 1:
The patent implements feedback control by continuously monitoring the actual power output of the PV array using power sensors and comparing it against reference power levels. The microcontroller adjusts relay switching decisions based on this feedback, maintaining accurate maximum power point tracking without being affected by temperature or environmental variations that plague photodetector-based systems.
Solution Approach 2:
The patent introduces power sensors as an intermediary between the PV array and the control system. These sensors directly measure the electrical power output and provide accurate readings to the microcontroller, serving as a more reliable mediator than photodetectors that are sensitive to environmental conditions.
3Productivity
If multiple loads are connected to PV array with relay switching, then energy utilization is improved, but switching errors increase due to intermittent power generation
Solution Approach 1:
The patent implements dynamic load management where the microcontroller continuously monitors power output and dynamically adjusts the connected load configuration in real-time. The system adapts to intermittent power generation by switching loads on and off based on current power levels, maintaining optimal energy utilization while responding to changing conditions.
Solution Approach 2:
The system uses feedback from power sensors to verify the actual power output before and after switching operations. This feedback mechanism allows the microcontroller to detect and correct switching errors, ensuring reliable load management even under intermittent power generation conditions.
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 enhances energy yield by ensuring nearly 100% of maximum available solar energy is delivered to loads, reduces costs by eliminating the need for power converters, and improves scalability, while minimizing premature and faulty switches, thus increasing overall system efficiency.
Implementation Method 1
a power sensor configured to measure an amount of power delivered from the PV array to the plurality of loads
Implementation Method 2
a plurality of loads configured to be powered by the PV array and switched on or off by a plurality of respective relays
Implementation Method 3
a PV array of solar modules
Data Source
AI summary
A load management system for a solar photovoltaic (PV) system is disclosed. The load management system may include a PV array of solar modules, a plurality of loads configured to be powered by the PV array and switched on or off by a plurality of respective relays, a power sensor configured to measure an amount of power delivered from the PV array to the plurality of loads, and a controller coupled to the power sensor and the plurality of relays. The controller may be configured to determine a first power output of the PV array at a first time, switch a load, determine a second power output of the PV array at a second time, compare the first power output and the second power output, and based on the comparison, maintain the switched load or undo the switching of the load.