Single-Wire Three-Phase Transmission via Phase Balancing
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Solution Overview
Problem
Existing three-phase electrical energy transmission systems face issues with current imbalance, leading to unstable operation of the generator and additional losses due to the need for multiple wires, which complicates underground installations and results in power loss.
Innovation Solution
The system incorporates a three-phase electric current signal converting device with inductance and capacitance in corresponding lines to balance currents, allowing transmission through a single wire while maintaining phase offset and equal amplitudes, using a transformer and capacitors to adjust phases and an inductance to compensate for phase shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single-wire transmission line is used to transmit three-phase electrical energy, then wire economy is achieved, but current imbalance occurs in the generator
Solution Approach 1:
The patent applies parameter changes by introducing inductance and capacitance elements to modify the electrical parameters of the transmission system. Specifically, inductors are added to two phases and capacitors to one phase to compensate for the phase shifts caused by single-wire transmission, thereby balancing the currents and maintaining generator stability while using only one wire
Solution Approach 2:
The patent uses inductance and capacitance elements as intermediary components to mediate the current flow in the single-wire system. These intermediaries compensate for the inherent phase imbalances by introducing controlled phase shifts, allowing the system to maintain balanced currents despite the simplified single-wire configuration
2Reliability
If conventional three-phase transmission with multiple wires is used, then generator operation stability is maintained, but wire quantity and installation complexity increase
Solution Approach 1:
The patent extracts the essential function of three-phase power transmission and implements it using only one wire instead of three or four wires. By removing the redundant wires and compensating with phase-shifting elements, the system achieves the same power transmission function with reduced complexity
Solution Approach 2:
The patent changes the transmission system parameters by using inductance and capacitance to create artificial phase shifts that simulate the behavior of multiple wires. This parameter modification allows single-wire transmission to achieve the stability of multi-wire systems
3Ease of operation
If signal processing methods like frequency converting are used in single-wire transmission, then transmission is achieved, but power loss increases
Solution Approach 1:
The patent replaces active signal processing methods (frequency conversion, signal straightening) with passive electrical components (inductors and capacitors). This substitution eliminates the need for active power conversion devices, thereby reducing power loss while maintaining transmission capability
Solution Approach 2:
The system uses the inherent properties of inductance and capacitance to automatically compensate for phase imbalances without requiring active control or signal processing. The passive components self-adjust the phase relationships based on the electrical load conditions, eliminating the need for power-consuming signal processing operations
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 configuration stabilizes the three-phase electric current generator operation, reduces wire requirements, and minimizes power loss by balancing currents, enabling efficient transmission over long distances with reduced infrastructure complexity.
Implementation Method 1
an inductance and a capacitance provided in corresponding lines through which currents of the three-phase current are transmitted
Implementation Method 2
an inductance and a capacitance provided in corresponding lines through which currents of the three-phase current are transmitted
Implementation Method 3
a three-phase electric current signal converting device connected with said three-phase electric current source and converting the three-phase electric current signal generated by the latter
Data Source
AI summary
An electrical energy transmission system has a three-phase electric current power source generating a three-phase current including three currents of different phases, a three-phase current converting device which converts at least some of the currents, a single-wire electric current transmission line configured to transmit the converted currents to a consumer, and a balancing device configured to balance the electric currents in the three-phase current source and providing thereby a stable operation of the three-phase current power source.