Micro-optimizer Segmentation for Solar PV Energy Harvest Optimization
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Solution Overview
Problem
Solar photovoltaic systems connected in series face limitations in energy harvesting due to output current constraints, varying input voltages affecting conversion efficiency, and difficulties in fault detection and maintenance, leading to reduced reliability and increased costs.
Innovation Solution
A solar photovoltaic system comprising photovoltaic assemblies, micro-optimizers for optimizing output currents and voltages, a manager for state management, and an inverter for AC current conversion, along with a method for energy harvest optimization and fault detection using detection circuits, maximum power point tracking, and communication for efficient power conversion and fault identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If photovoltaic assemblies are connected in series to increase voltage, then voltage output is improved, but energy harvesting is limited by the lowest current assembly
Solution Approach 1:
The system segments the photovoltaic string into multiple independent modules, each with its own micro-optimizer. This allows each module to operate independently at its optimal current level while contributing to the overall series voltage output, resolving the contradiction between high voltage and maximum energy harvesting.
2Adaptability or versatility
If inverter supports wide input voltage range, then adaptability is improved, but conversion efficiency decreases from optimal voltage
Solution Approach 1:
The micro-optimizers actively regulate and stabilize the DC voltage output from each photovoltaic module, maintaining it at the optimal level for inverter conversion. This eliminates the need for the inverter to accommodate wide voltage variations while ensuring operation at peak efficiency.
3Stress or pressure
If photovoltaic assemblies are connected in series, then voltage is increased, but fault detection and maintenance difficulty increases
Solution Approach 1:
By dividing the photovoltaic system into segmented modules with individual micro-optimizers, faults can be isolated and identified at the module level rather than requiring analysis of the entire series string. Each micro-optimizer monitors its own module's performance, enabling precise fault localization.
Solution Approach 2:
The system incorporates feedback mechanisms where each micro-optimizer continuously monitors its photovoltaic module's electrical parameters and communicates status to the central controller. This real-time feedback enables automatic fault detection and diagnosis without manual inspection of the entire system.
4Productivity
If micro-optimizers are added to each photovoltaic assembly, then energy harvesting is optimized, but device complexity increases
Solution Approach 1:
Each micro-optimizer is designed as a universal module that integrates multiple functions: maximum power point tracking, voltage regulation, fault detection, and communication. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in overall 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 maximizes power generation from each photovoltaic assembly, simplifies system design, optimizes inverter performance, and enables flexible DC voltage output, while allowing for real-time fault detection and performance monitoring, enhancing overall system efficiency and reliability.
Implementation Method 1
a plurality of photovoltaic assemblies for harvesting solar energy to generate DC currents
Data Source
AI summary
This invention provides a solar photovoltaic system, comprising: a plurality of photovoltaic assemblies, for harvesting solar energy to generate DC currents; a plurality of micro-optimizers having input terminals coupled to the photovoltaic assemblies and having output terminals connected in series with each other, for optimizing output currents and/or output voltages of the photovoltaic assemblies, to generate maximum power; a manager configured to communicate with the plurality of micro-optimizers, for managing operating states of the micro-optimizers; and an inverter coupled to one or more strings of the micro-optimizers, for converting the optimized DC currents into AC currents and outputting the AC currents to a power grid. This invention further provides a method for energy harvest optimization and a method for fault detection of a solar photovoltaic system.