HVDC-Connected PV Generator Using Bare Conductors and Direct Coupling
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Solution Overview
Problem
Conventional photovoltaic power systems face limitations in voltage capacity, system complexity, and efficiency due to the use of fully electrically insulated components, which are costly and inefficient for high-voltage direct current transmission.
Innovation Solution
A high-voltage PV generator directly connected to a high-voltage direct current transmission line without intermediate power conversion equipment, utilizing bare conductors and series-parallel connections to reduce series resistance losses and integrate production and transmission efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fully electrically insulated components are used in conventional PV systems, then safety and reliability are improved, but system complexity and costs increase
Solution Approach 1:
The patent extracts and removes the insulation layer from conductors, transitioning from fully insulated components to bare conductor configuration. This extraction eliminates unnecessary insulation materials and simplifies the system while maintaining safety through the inherent insulation provided by air and the controlled electrical configuration of the PV string connected to the HVDC transmission line.
Solution Approach 2:
The patent applies local quality by providing insulation only where absolutely necessary (at connection points and interfaces) rather than along the entire conductor length. The bare conductors are used in regions where air provides sufficient insulation, optimizing the balance between safety and system simplicity.
2Reliability
If fully electrically insulated components are used in conventional PV systems, then safety and reliability are improved, but costs increase
Solution Approach 1:
The patent removes the insulation layer from conductors, eliminating the cost of insulation materials and their installation. This extraction of unnecessary insulation components directly reduces manufacturing costs while maintaining safety through the controlled electrical configuration and selective insulation at critical points only.
Solution Approach 2:
The patent replaces expensive continuous insulation with a more economical approach using bare conductors with minimal insulation only where required. This substitution of expensive insulation materials with cheaper bare conductor configuration reduces overall system costs while maintaining adequate safety levels.
3Reliability
If PV modules are connected via insulated conductors, then electrical safety is improved, but series resistance losses increase
Solution Approach 1:
The patent extracts and removes the insulation layer from conductors used to connect PV modules. This removal of insulation reduces the overall resistance of the conductor, thereby reducing series resistance losses and improving energy efficiency while maintaining electrical safety through the controlled electrical configuration.
4Power
If intermediate power conversion equipment is used between PV generator and HVDC line, then voltage matching is improved, but system complexity and costs increase
Solution Approach 1:
The patent merges the PV generator directly with the HVDC transmission line, eliminating intermediate power conversion equipment. This direct connection integrates generation and transmission functions, reducing system complexity and costs while maintaining voltage compatibility through the inherent voltage characteristics of the PV string configuration.
Solution Approach 2:
The patent creates a multi-functional direct connection that simultaneously serves as both the electrical connection and the voltage matching interface between the PV generator and HVDC line. This universal connection eliminates the need for separate voltage matching equipment, simplifying the overall system.
5Power
If intermediate power conversion equipment is used between PV generator and HVDC line, then voltage matching is improved, but power conversion efficiency decreases
Solution Approach 1:
The patent merges the PV generator directly with the HVDC transmission line, eliminating intermediate power conversion equipment that would cause energy losses. This direct integration preserves power conversion efficiency by removing conversion steps while maintaining voltage compatibility through the PV string configuration.
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
This approach reduces system complexity and costs while enhancing efficiency and flexibility by eliminating the need for additional insulation materials and optimizing power transmission.
Implementation Method 1
a high-voltage (HV) photovoltaic (PV) generator connected to the high-voltage direct current transmission line
Implementation Method 2
the PV modules are electrically connected via bare conductors
Data Source
Figure 1
Figure 2~3
Figure 4a~5
AI summary
The invention relates to a system comprising a high-voltage direct current (HVDC) transmission line (10) carried by pylons (20), a high-voltage PV generator (30) connected to the high-voltage direct current transmission line (10), a power conversion equipment (40) with an input connected to the high-voltage direct current transmission line (10) and an output connectable to an AC or DC grid (50), comprising at least one of a point-source, a load and a network. A high-voltage output of the high-voltage PV generator (30) is directly connected (11) to a transmission pole (12) of the high-voltage direct current transmission line (10).