Switchable Longitudinal Voltage Source for Bidirectional DC Power Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing switchable longitudinal voltage sources require a large number of components, leading to inefficiencies and increased complexity.
Innovation Solution
A switchable longitudinal voltage source with a polarity reversal device connected between output terminals, utilizing a minimal number of switches and switches with external control, allowing for efficient current distribution to high-voltage DC transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a longitudinal voltage source with switchable polarity is implemented, then the direction of active power flow can be reversed en masse, but the device complexity increases due to additional switching components
Solution Approach 1:
The longitudinal voltage source is segmented into two independent voltage sources (first and second voltage sources) that can be independently controlled. Each voltage source connects to one polarity terminal, allowing independent control of each half-circuit. This segmentation enables polarity reversal without requiring complex switching arrangements, as each segment can be activated or deactivated independently through simple switching elements.
Solution Approach 2:
The patent implements dynamic polarity switching by providing switching elements that can dynamically change the connection state of each voltage source to the common connection point. The switching elements enable the longitudinal voltage source to transition between different polarity states (first polarity, second polarity, or floating) in real-time, allowing adaptive control of power flow direction based on system requirements.
2Adaptability or versatility
If polarity reversal is achieved through conventional switching methods, then the direction of active power flow can be changed, but power loss increases due to additional switching operations
Solution Approach 1:
By segmenting the voltage source into two independent halves, each with its own switching element, the patent enables selective activation. When polarity reversal is needed, only the necessary switching operations are performed on the relevant segment, rather than requiring full-system switching. This reduces the number of simultaneous switching operations and associated power losses.
Solution Approach 2:
The common connection point serves as an intermediary that facilitates polarity reversal without requiring direct switching of the entire voltage source. The switching elements connect or disconnect voltage sources to this common point, enabling polarity change through controlled connection reconfiguration rather than direct polarity switching, which minimizes switching losses.
3Adaptability or versatility
If a longitudinal voltage source with switchable polarity is implemented, then bidirectional active power flow control is enabled, but the control system complexity increases
Solution Approach 1:
The control system manages complexity by controlling each voltage source segment independently. The control unit can selectively activate or deactivate the first or second voltage source based on power flow requirements, simplifying the control logic compared to managing a single complex switching network. Each segment's control is independent, allowing straightforward implementation of bidirectional power flow control.
Solution Approach 2:
The control system achieves dynamic polarity reversal control through independent switching elements that can be actuated based on real-time power flow requirements. The control unit monitors system conditions and dynamically switches between different polarity configurations by controlling the switching elements, enabling adaptive bidirectional power flow control with relatively simple control logic.
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 solution reduces the number of components required while maintaining effective current distribution, minimizing electrical losses, and enabling bidirectional load flow control.
Implementation Method 1
a first voltage source (131) and a second voltage source (132) are arranged in a longitudinal voltage source (130)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates, inter alia, to a switchable longitudinal voltage source (10, 10'). According to the invention, a center terminal (M1) of a first series circuit (R1) directly forms a first output terminal (A1) and a center terminal (M2) of a second series circuit (R2) directly forms a second output terminal (A2).