Dynamic Phase Switching for Unbalanced Load Reduction
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Solution Overview
Problem
Three-phase low-voltage circuits often experience asymmetric loading due to single-phase energy sinks like electric vehicle chargers and battery storage units, leading to unbalanced loads and high compensation currents in the neutral conductor, which existing technologies fail to address effectively.
Innovation Solution
A device utilizing electronic switching units, specifically semiconductor-based units, to dynamically assign consumers to phases, ensuring even loading by switching phases based on voltage or current levels, with frequency and voltage sensors for precise control, allowing rapid and power-free phase changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If single-phase energy sinks (electric vehicle chargers, battery storage units) are connected to three-phase low-voltage circuits, then the availability and flexibility of power supply is improved, but asymmetric loading occurs leading to unbalanced loads and high compensation currents in the neutral conductor
Solution Approach 1:
The patent applies dynamics by enabling dynamic phase switching of single-phase consumers between the three phases. The system continuously monitors the loading status of each phase and automatically switches consumers to different phases to maintain balance, transforming the static phase assignment into a dynamic, adaptive process that responds to changing load conditions
Solution Approach 2:
The patent replaces traditional mechanical switching devices with electronic switching units based on semiconductor components. This substitution eliminates mechanical wear and contact arcing while enabling faster, more precise switching operations. The electronic switches are controlled by a control unit that monitors phase loading and executes switching commands to maintain balance
2Ease of operation
If electromechanical switching units are used for phase switching, then phase changes can be achieved, but mechanical wear and contact arcing occur reducing reliability and increasing maintenance requirements
Solution Approach 1:
The patent directly addresses this contradiction by substituting electromechanical switching units with electronic switching units based on semiconductor components. This replacement eliminates all mechanical parts including contacts, springs, and moving components, thereby completely removing mechanical wear and contact arcing issues while maintaining full phase switching capability
3Ease of operation
If conventional switching devices are used for phase changes, then phase switching is possible, but power losses occur during switching operations and switching speed is limited
Solution Approach 1:
The patent replaces conventional electromechanical switching devices with electronic semiconductor switches that exhibit significantly lower on-resistance and faster switching characteristics. This substitution reduces power losses during both the on-state and switching transitions, while the electronic control enables precise timing to minimize switching losses further
Data Source
AI summary
A device, for a low-voltage circuit, includes a four-pole input connection for a three-phase AC circuit having a neutral conductor, including a first, second and third input phase pole, and an input neutral conductor pole; a two-pole output connection; a first connection between the between the input and output neutral conductor pole; a first, second and third electronic switch unit to carry out opening and closing of an electrical connection; a voltage sensor for determining the voltage level of the input phase poles; and a controller connected to the voltage sensor and the electronic switch units, designed such that, depending on the voltage level of the input phase poles, the first, second or third input phase pole is connected to the first output phase pole via the respective electronic switch unit, the first output phase pole being connected to the respective input phase pole having the highest voltage level.