PV Power Converter Mode Switching for Thermal Loss Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Photovoltaic (PV) systems face performance degradation due to heat generated from sunlight and electrical current, which can reduce efficiency and shorten component lifespan.
Innovation Solution
Implementing a system that allows power devices in PV systems to switch between power conversion modes, bypass modes, shutdown modes, and wakeup modes based on operational parameters, such as temperature and current thresholds, to manage heat and reduce power losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power devices operate continuously in power conversion mode, then power system productivity is maintained, but heat accumulation increases and component lifespan decreases
Solution Approach 1:
The power device operates in periodic cycles alternating between power conversion mode and bypass mode. The controller monitors temperature and duty cycle parameters, switching between modes to prevent continuous operation-induced overheating while maintaining average power conversion efficiency through controlled periodic activation.
Solution Approach 2:
The harmful function of the power device (heat generation during power conversion) is extracted and separated from the useful function (power conversion). By introducing a bypass mode that circumvents the power conversion path, the system removes the heat-generating aspect while preserving the power transfer capability through alternative pathways.
2Temperature
If power devices are shut down to reduce heat, then temperature decreases, but power system productivity is reduced
Solution Approach 1:
The system dynamically adjusts its operational state based on real-time temperature and duty cycle conditions. Rather than static shutdown or continuous operation, the controller continuously modulates between power conversion mode and bypass mode, optimizing the balance between temperature control and power output according to varying operational demands.
Solution Approach 2:
The system changes operational parameters (mode of operation, duty cycle ratio) in response to temperature feedback. When temperature exceeds thresholds, the duty cycle is reduced or bypass mode is activated; when temperature is acceptable, full power conversion mode is restored, thereby adapting performance parameters to thermal conditions.
3Temperature
If bypass mode is used to reduce heat, then temperature decreases and efficiency improves, but power conversion capability is reduced
Solution Approach 1:
The power transmission path is segmented into two distinct modes: power conversion mode for efficient power transformation and bypass mode for direct power transfer with minimal heat generation. The controller segments the operational timeline into alternating intervals of these modes, allowing the system to exploit the advantages of each mode at different times.
Solution Approach 2:
The power device is designed with multi-functionality, capable of operating in both power conversion mode (for voltage transformation and power optimization) and bypass mode (for direct power transfer). This universal design allows the single device to fulfill multiple functional requirements depending on thermal and operational conditions.
4Duration of action of stationary object
If shutdown mode is activated to extend component lifespan, then heat damage is prevented, but system reliability during operation is reduced
Solution Approach 1:
The system implements preventive thermal management by monitoring temperature and duty cycle parameters before critical damage occurs. The controller anticipates thermal stress accumulation and proactively switches to bypass mode or reduces duty cycle, cushioning the power device against conditions that would cause degradation or failure, thereby extending lifespan while maintaining operational availability.
Data Source
AI summary
Systems, apparatuses, and methods are described for reducing power. The reducing of power may be done to reduce a temperature related to one or more elements of a power system. The reducing of power may depend on the mode of operation of one or more power devices of the power system.