Distributed Central Optimizer Architecture for PV Voltage Control
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Solution Overview
Problem
Photovoltaic power generation systems face challenges in operating photovoltaic modules at maximum power efficiency due to varying output voltages caused by factors like solar radiation and temperature, and the need to manage differences in conditions across multiple modules, which affects the conversion of DC to AC power efficiently.
Innovation Solution
A distributed/central optimizer system that includes photovoltaic modules with distributed power optimizers and a central optimizer, which can switch between bypass and boost modes to maintain a stable DC voltage output, reducing stress on components and ensuring efficient power generation by adjusting the voltage levels based on the conditions of individual modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photovoltaic modules are operated at different output voltages to maximize power efficiency under varying conditions, then power efficiency is improved, but system complexity increases due to the need for individual voltage control of each module
Solution Approach 1:
The system divides voltage control into two segments: distributed power optimizers at each photovoltaic module level for individual voltage adjustment, and a central optimizer that coordinates their operation. This segmentation allows each module to operate at its optimal voltage point while the central optimizer manages overall system complexity through centralized control logic.
Solution Approach 2:
The central optimizer acts as an intermediary between the distributed power optimizers and the grid connection point. It receives voltage information from individual modules, processes this data centrally, and coordinates the overall voltage management strategy, thereby reducing the complexity burden on individual module controllers while maintaining the ability to optimize each module's power output.
2Device complexity
If distributed power optimizers operate without central coordination, then system simplicity is maintained, but voltage stability and power efficiency deteriorate due to inability to manage mismatched module outputs
Solution Approach 1:
The central optimizer implements a feedback mechanism by continuously monitoring the output voltages and operating conditions of all distributed power optimizers. Based on this feedback information, the central optimizer adjusts its control strategy to maintain voltage stability across the system while allowing individual modules to operate near their optimal power points, thus achieving both stability and efficiency.
3Device complexity
If photovoltaic modules with varying conditions are connected directly to the grid, then device complexity is reduced, but power loss increases due to inability to operate modules at maximum power point
Solution Approach 1:
The system employs dynamic voltage adjustment capabilities where distributed power optimizers can continuously adapt their output voltage based on real-time operating conditions of each photovoltaic module. The central optimizer dynamically coordinates these adjustments to ensure modules operate at or near their maximum power point under varying conditions such as solar radiation and temperature changes, thereby minimizing power loss while maintaining manageable system complexity.
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 enhances the operational efficiency of photovoltaic modules by maintaining a consistent voltage output, reducing the need for voltage limiting and component stress, and ensuring stable power delivery to the AC grid, thereby improving overall system performance.
Implementation Method 1
Photovoltaic modules generate Direct Current (DC) voltages
Implementation Method 2
Each distributed power optimizer has an input connected to the DC voltage output of one of the photovoltaic modules and a DC voltage output. The system also has a central optimizer having a DC voltage output and an input connected to the combined DC voltage output of a set of the distributed power optimizers
Data Source
AI summary
The disclosure relates to technology for providing power, voltage, and/or current from a combination of photovoltaic modules. In one aspect, a system has central power optimizer, which is located between a group of distributed power optimizers and a solar inverter. Each distributed power optimizer may be connected to the DC output of one photovoltaic modules, and may be used to regulate the power output of the photovoltaic module. The combined DC voltages of the distributed power optimizers may be provided to the input of the central power optimizer.