Phase Selector System for Polyphase Load Balancing
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Solution Overview
Problem
Existing phase selection systems in polyphase networks, particularly in electric vehicle charging installations, fail to achieve balanced load distribution across phases, leading to inefficiencies and imbalances, especially when single-phase equipment is connected to a three-phase network.
Innovation Solution
A phase selector system is introduced that intercepts the energizing control signal for each socket, evaluates the least loaded phase by measuring current or voltage upstream, and selects this phase for powering single-phase equipment, thereby balancing the load across phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phase selector is used to switch between phases for single-phase loads, then power supply continuity is improved, but load balance between phases deteriorates
Solution Approach 1:
The control system continuously monitors the load on each phase and uses this feedback information to make intelligent switching decisions. The phase selector evaluates real-time load conditions and selects the least loaded phase, creating a closed-loop control system that simultaneously ensures power continuity and maintains load balance.
Solution Approach 2:
The system performs preliminary evaluation of phase load conditions before switching occurs. By assessing the load status in advance and pre-determining the optimal phase selection, the system avoids reactive switching that could disrupt load balance, thereby maintaining both reliability and balance.
2Adaptability or versatility
If single-phase equipment is connected to a polyphase network, then equipment compatibility is improved, but load distribution balance deteriorates
Solution Approach 1:
The phase selector acts as an intermediary device between the polyphase network and single-phase equipment. It interfaces the three-phase power supply with single-phase loads by intelligently selecting which phase to connect to the equipment, thereby enabling equipment compatibility while maintaining load distribution balance through controlled phase selection.
3Device complexity
If phase switching is performed without centralized control, then system complexity is reduced, but load balancing precision deteriorates
Solution Approach 1:
The patent merges the control functions of multiple phase selectors into a centralized control system. By combining the monitoring and decision-making capabilities of individual selectors into a unified system, the patent achieves precise load balancing across the entire polyphase network while managing system complexity through integrated control architecture.
Data Source
AI summary
A method for balancing a polyphase network for supplying an installation including a plurality of sockets for plugging-in electrical equipment, wherein a phase selector is inserted for each socket, between a system for supplying a polyphase voltage and the socket, and intercepts a command signal for energizing the socket. Once an energizing command has been received from one of the monophase equipments, the least charged phase is selected for powering the equipment, the evaluation of the least charged phase being carried out upstream of the system.