Shared-Inductor Buck-Boost Optimizer for PV Power Regulation
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Solution Overview
Problem
Photovoltaic power generation systems face challenges in operating photovoltaic panels at maximum power efficiency due to varying output voltages caused by factors like solar radiation and temperature, and existing technologies struggle to efficiently manage the conversion of DC voltages from multiple photovoltaic panels to AC power grid requirements.
Innovation Solution
A buck-boost optimizer system comprising inductorless buck stages and a boost stage, where each buck stage regulates the power output of individual photovoltaic modules independently and the boost stage boosts the combined output voltage using a single inductor, allowing for efficient power transfer and voltage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual inductors are used in each buck stage, then power regulation precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the inductor components by having multiple buck stages share a common inductor instead of each stage having its own inductor. This reduces the total number of inductors from n (where n is the number of buck stages) to just one shared inductor, thereby reducing device complexity and cost while maintaining power regulation functionality through coordinated control of the buck stages.
Solution Approach 2:
The shared inductor serves multiple functions simultaneously - it acts as the inductor for all buck stages and also provides the necessary energy storage and current smoothing for the entire system. This multi-functional design eliminates the need for duplicate inductor components in each buck stage, resolving the contradiction between precision and complexity.
2Productivity
If multiple photovoltaic panels are operated independently, then maximum power extraction is improved, but system complexity increases
Solution Approach 1:
The patent combines multiple independently controlled buck stages into a unified system that shares common components (inductor, controller). Each buck stage can still independently regulate power from its associated photovoltaic panel to achieve maximum power extraction, while the shared components reduce overall system complexity compared to fully independent designs.
3Speed
If DC voltage is directly converted to AC, then conversion speed is improved, but power efficiency decreases
Solution Approach 1:
The patent introduces an intermediate DC-DC conversion stage (buck stages) before the final DC-AC conversion. This preliminary action allows the system to first optimize the DC voltage levels and extract maximum power from photovoltaic panels, then proceed to AC conversion. The two-stage approach balances conversion speed with power efficiency by performing power optimization before the final conversion.
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
The system enables photovoltaic panels to operate at or near maximum power points, optimizing power output and efficiently converting DC to AC power, while reducing costs and complexity by eliminating the need for individual inductors in each buck stage.
Implementation Method 1
the boost converter module... using only a single inductance
Implementation Method 2
Photovoltaic panels generate Direct Current (DC) voltages
Data Source
Figure 1
Figure 2A~2D
Figure 2E
AI summary
Provided is technology for providing power, voltage, and/or current from a combination of DC power sources, such as photovoltaic modules or DC batteries. One aspect includes a buck-boost optimizer (110) having a number of inductorless buck stages (104) and a boost stage (106). The buck-boost optimizer (110) may be used within a power generation system. The combined output voltages of each of the buck stages (104) may be input to the boost stage (106). The boost stage (106) may have an inductor (208) that may serve as an energy storage device to boost a voltage, as well as to filter a signal from the buck stages (104). Thus, the buck-boost optimizer (110) may use a single inductor. Having a single inductor provides for a very efficient power generation system. Also, cost and size of components in the power generation system may be reduced.