EV Charging Phase Assignment for Balanced Three-Phase Loads
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Solution Overview
Problem
Existing charging devices for electric vehicles do not efficiently utilize multi-phase power networks symmetrically, leading to uneven distribution of electrical load across phases, which can result in inefficient energy transfer and potential strain on the power grid.
Innovation Solution
A method where a computing device determines connection information for each charging device to optimize phase assignments, ensuring that phases are distributed uniformly across multiple charging devices, potentially using a cyclic sequence to ensure even utilization, thereby eliminating the need for load-dependent phase switching devices and simplifying the construction of charging devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If phase switching devices are used to dynamically balance load across phases, then phase utilization symmetry is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by pre-assigning phase connections to charging devices during installation based on their positions in a cyclic sequence. This initial configuration ensures balanced phase utilization without requiring dynamic phase switching during operation. The phase assignment is determined in advance by a computing device based on the charging device's position in the cyclic sequence, eliminating the need for complex real-time phase switching mechanisms.
2Productivity
If dynamic phase switching is implemented during charging, then energy transfer efficiency is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring phase connections during installation rather than requiring dynamic switching during manufacturing or operation. The computing device determines the appropriate phase assignment based on the charging device's position in a cyclic sequence before the device begins operation. This approach maintains energy transfer efficiency through balanced phase utilization while significantly simplifying manufacturing requirements.
3Adaptability or versatility
If multiple charging devices are connected to multi-phase power network without optimized assignment, then charging availability increases, but phase load distribution becomes uneven
Solution Approach 1:
The patent applies segmentation by dividing the phase assignment strategy into discrete positions within a cyclic sequence. Each charging device is assigned a specific position in the sequence, and the computing device determines phase connections based on this position. This segmented approach allows multiple charging devices to be connected simultaneously while maintaining balanced phase load distribution through systematic phase assignment.
Solution Approach 2:
The patent implements periodic action through the use of a cyclic sequence for phase assignment. The phase connections are determined by the position of each charging device within this cyclic sequence, creating a periodic pattern of phase utilization. This periodic assignment ensures that as charging devices are added to the system, the phase load distribution remains balanced and symmetric.
Data Source
Figure 1~3
AI summary
Method for assigning connection information to a charging device (1) designed for charging an electrical energy storage device, wherein a computing device (16) determines connection information for each charging device (1, 10, 11) of a plurality of charging devices (1, 10, 11), wherein each charging device (1, 10, 11) comprises at least one phase connection (2, 3, 12 - 15) and the connection information for the at least one phase connection (2, 3, 12 - 15) specifies a permissible phase assignment from a set of several permissible phase assignments, wherein the phase assignments describe an assignment of each phase of a multi-phase power network to the at least one phase connection (2, 3, 12 - 15) and wherein the connection information is determined by the computing device (16) in such a way that different connection information is determined for at least one pair of charging devices (1, 10, 11).