DC Boost-Buck Power Transmission System
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Solution Overview
Problem
Existing DC power transmission systems require AC transformers for voltage conversion, leading to high construction costs and inefficiencies, and are not well-suited for the increasing prevalence of renewable energy sources like photovoltaic power generation.
Innovation Solution
A full DC boost-buck power transmission system utilizing boost and buck stations with battery packs that can switch between series and parallel connections to manage DC power, eliminating the need for AC-DC conversions and allowing for efficient storage, transmission, and distribution of DC power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If AC transformers are used for voltage conversion in DC power transmission systems, then voltage boost and buck can be achieved, but construction cost increases and system efficiency decreases
Solution Approach 1:
The patent replaces the mechanical AC transformer system with an electronic DC-DC conversion system. The converter station uses power electronic devices (such as IGBTs) to directly convert DC voltage levels without requiring AC transformers, thereby eliminating the need for complex mechanical transformation equipment while achieving the same voltage conversion function.
Solution Approach 2:
The patent changes the fundamental operating parameters of the power transmission system by maintaining DC form throughout the entire transmission chain. Instead of converting between AC and DC, the system uses DC-DC conversion with adjustable voltage ratios, allowing flexible voltage transformation while keeping all components optimized for DC operation.
2Power
If AC transformers are used for voltage conversion in DC power transmission systems, then voltage boost and buck can be achieved, but transmission efficiency decreases
Solution Approach 1:
The patent replaces the mechanical AC transformer system with an electronic DC-DC conversion system. The converter station uses power electronic devices (such as IGBTs) to directly convert DC voltage levels without requiring AC transformers, thereby eliminating the need for complex mechanical transformation equipment while achieving the same voltage conversion function.
3Loss of energy
If DC power transmission systems are designed for stable power sources, then transmission efficiency is high, but adaptability to intermittent renewable energy sources decreases
Solution Approach 1:
The patent introduces dynamic control capabilities into the DC power transmission system. The converter station can dynamically adjust operating parameters such as voltage, current, and power flow direction to accommodate varying input from renewable energy sources. This dynamic adaptability allows the system to handle intermittent power generation while maintaining transmission efficiency through optimal real-time operation.
Solution Approach 2:
The patent designs the converter station with multi-functional capabilities that can handle various types of power sources. The system can operate in multiple modes including rectification, inversion, and DC-DC conversion, making it universally adaptable to different renewable energy sources such as photovoltaic, wind, and hydroelectric generation while maintaining high transmission efficiency.
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
Enables efficient DC power transmission and distribution without AC-DC conversions, reducing construction costs and enhancing flexibility in handling intermittent renewable energy sources.
Implementation Method 1
the first battery packs are connected in parallel for storage of DC power from the DC power supply; when the storage of the first battery packs is completed, the first battery packs are disconnected from the DC power supply and are connected in series to perform the boost operation
Data Source
Figure 1-1
Figure 1-2A~1-2B
Figure 1-2C~1-3
AI summary
A full DC buck-boost power transmission system comprises at least one DC power supply, at least one boost station, a high-voltage cable and at least one buck station connected in sequence. The boost station includes a first battery pack unit, and the buck station includes a second battery pack unit. The battery packs are connected in series or parallel, and connection modes of the battery packs in the at least one boost station and the at least one buck station are switched between series connection and parallel connection, thereby realizing the storage, boost, transmission, buck and supply of the DC power. Therefore, the present disclosure constructed a full DC buck-boost power transmission system without DC to AC and AC to DC conversions, achieving the goal of "DC power generation-DC power transmission-DC power distribution".