Photovoltaic Bus Voltage Control With Neutral Bus Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Photovoltaic systems face challenges with high voltage levels that exceed the withstand voltage of power components, making it difficult to meet production compliance requirements and posing risks of damage and safety hazards.
Innovation Solution
A photovoltaic system with three direct current buses (positive, negative, and neutral) and two inverters, controlled by a controller to manage voltages during startup and shutdown to ensure they remain below a preset threshold, using power converters and voltage regulation circuits to maintain compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the voltage level of the photovoltaic system is increased to improve power generation capacity, then the power output is improved, but the withstand voltage requirement of power components becomes more difficult to meet
Solution Approach 1:
The patent divides the single high-voltage inverter system into two separate inverters operating in parallel, each handling a portion of the total power. This segmentation allows each inverter to operate at lower voltage levels that are easier to manage and meet component withstand voltage requirements, while the system as a whole achieves higher power generation capacity through combined output.
2Loss of energy
If the voltage level of the photovoltaic system is increased to reduce transmission losses, then the energy efficiency is improved, but the production compliance requirement becomes harder to meet
Solution Approach 1:
The patent segments the high-voltage transmission function into two parallel low-voltage paths through two inverters. Each inverter operates within compliant voltage limits, ensuring production compliance requirements are met, while the combined parallel operation maintains efficient power transmission by distributing the load and reducing overall transmission losses.
3Loss of energy
If the voltage level of the photovoltaic system is increased to improve power efficiency, then the energy transmission efficiency is improved, but the safety risk increases
Solution Approach 1:
The patent divides the high-voltage system into two separate low-voltage inverter systems operating in parallel. This segmentation reduces the voltage level at which operators and components are exposed, thereby lowering safety risks such as electric shock and arc flash hazards, while maintaining energy transmission efficiency through the combined parallel operation of both inverters.
4Loss of energy
If the voltage level of the photovoltaic system is increased to reduce current and minimize losses, then the energy efficiency is improved, but the difficulty of component selection increases
Solution Approach 1:
The patent segments the high-voltage, low-current requirement into two parallel low-voltage, moderate-current paths. This makes component selection easier because standard low-voltage power components with adequate current ratings are more readily available and easier to source, while the parallel configuration maintains the desired low-loss energy transmission efficiency.
Data Source
AI summary
A first input end of a first inverter is connected to a second end of a direct current positive bus, and a second input end of the first inverter is connected to a second end of a neutral bus. A first input end of a second inverter is connected to the second end of the neutral bus, and a second input end of the second inverter is connected to a second end of a direct current negative bus. A controller is configured to control, in startup and shutdown processes, a voltage to ground of the direct current positive bus, a voltage to ground of the direct current negative bus, and a voltage to ground of the neutral bus each to be less than or equal to a preset voltage threshold, to ensure personal safety and device safety.