Passive Transformer Power Splitter for AC Network Flow Control
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Solution Overview
Problem
Conventional AC power flow control solutions are complex, expensive, and often require continuous control, which is not necessary for all applications, and introduce unwanted system dynamics or high maintenance costs.
Innovation Solution
A series injection device with a power splitter that uses a passive or mostly passive transformer to control power flow between multiple parallel AC power lines, allowing for equal current sharing and reactive power recycling, reducing the need for expensive converters and fast switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power electronic converters are used for AC power flow control, then continuous control capability is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the active power electronic switching components from the power flow control system and replaces them with a passive transformer-based series injection device. The transformer provides the necessary voltage injection capability without requiring complex power electronic converters, thereby eliminating continuous control requirements while maintaining power flow control functionality.
Solution Approach 2:
The patent employs a simple transformer-based series injection device that is much simpler and less expensive than power electronic converters. Although the device provides discrete rather than continuous control, it achieves the essential function of preventing line overloading at a fraction of the cost and complexity.
2Device complexity
If discrete control is implemented instead of continuous control, then cost and sophistication are reduced, but control flexibility is limited
Solution Approach 1:
The series injection device automatically balances power flow between parallel lines through its inherent transformer action without requiring complex control systems. The device self-regulates by injecting appropriate voltages to equalize currents, eliminating the need for sophisticated continuous control while maintaining adaptability to varying load conditions.
3Ease of operation
If conventional power flow controllers are used, then power flow control is achieved, but unwanted system dynamics are introduced
Solution Approach 1:
The patent replaces active power electronic control mechanisms with a passive transformer-based system that operates on fundamental electromagnetic principles. This substitution eliminates the unwanted system dynamics associated with fast switching converters while maintaining the ability to control power flow through voltage injection.
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 provides cost-effective and reliable power flow control in AC networks by using a passive transformer to split power equally between lines, reducing the kVA rating and costs compared to traditional solutions, while maintaining high reliability and adaptability to varying impedance mismatches.
Implementation Method 1
A series injection device with a power splitter that uses a passive or mostly passive transformer to control power flow between multiple parallel AC power lines
Data Source
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AI summary
A series injection device includes a power splitter coupled to two or more lines of an AC power system. The power splitter includes a coupling transformer for each phase of a single phase or polyphase AC circuit that includes the two or more lines. Each of the coupling transformers couples one of the phases of the two or more lines. The power splitter is configured to inject a first voltage of a first polarity into one or more of the two or more lines and inject a second voltage of a second polarity opposite the first polarity into at least one of the two or more lines via the same coupling transformers used to inject the first voltage. The first and the second voltages are controllable, and may or may not be independently variable.