The invention introduces a transformerless dual inverter structure designed to maximize power extraction from multiple photovoltaic (PV) arrays. Traditional transformerless inverters face issues such as high ground leakage current and limited power output under varied environmental conditions. This new dual inverter configuration addresses these problems by enabling independent operation of two inverters, which can be decoupled to ensure continuous power delivery even if one PV array fails. The system utilizes innovative control techniques involving either DC current injection or phase shifting of output currents to enhance efficiency and maintain voltage balance. This design supports higher power applications and improves overall system safety and reliability.
Figure (1) Transformerless dual inverter structure
The patent addresses the challenge of leakage currents in grid-connected photovoltaic (PV) systems, particularly those using multiple PV arrays. Leakage currents can lead to energy losses, safety hazards, and electromagnetic interference. Existing solutions often fail to completely eliminate this issue or optimize the use of DC links in multi-PV array configurations. The patent aims to provide a system and method that ensures no DC current is injected into the grid, thereby enhancing efficiency, safety, and system performance.
- Transformer-less Converter Capability: The invention suggests the possibility of using a multilevel transformerless converter, which can reduce system size, cost, and improve efficiency by eliminating the need for a bulky transformer.
- Dual inverter structure: Enables simultaneous power extraction from multiple PV arrays, maximizing solar energy utilization.
- Elimination of Leakage Current: The core innovation lies in a unique configuration that directly connects the grid neutral to the PV array and employs a specific DC current injection/subtraction method to prevent DC current from entering the grid.
It describes the theoretical configuration and functionality of the invention rather than its physical implementation or testing as a prototype.
A Hardware prototype has been developed, and all the simulations and hardware studies have been successfully performed.
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By reducing the size, cost, and complexity of solar inverters, this technology can make rooftop solar power more accessible and attractive to homeowners and businesses. This can lead to a wider societal shift towards renewable energy sources. The ability to extract maximum power from solar panels and minimize power losses during grid connection can contribute to a more efficient electricity grid. This translates to reduced reliance on fossil fuels and lower greenhouse gas emissions. The transformerless design and control features of this inverter can help to stabilize the power grid by improving power quality and reducing voltage fluctuations. This can benefit a wide range of electricity consumers.
Transformerless Inverter, Solar Energy, Dual Inverter, Power Efficiency, Renewable Energy, Grid Integration, Electric Vehicle (EV) Charging Infrastructure.
Geography of IP
Type of IP
201821026838
507679