Service Transformer EV Charging Capacity Under Thermal Limits
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Solution Overview
Problem
The rapid proliferation of electric vehicles (EVs) requires a ubiquitous and cost-effective fast charging infrastructure, as traditional methods are expensive and inefficient, with existing DC fast charging stations not adequately addressing the need for broad deployment and optimal utilization of electrical grid capacity.
Innovation Solution
A method and system utilizing existing service transformers on the electric utility grid to monitor and determine available charging capacity, allowing for efficient allocation of EV charging stations and potentially integrating bi-directional power flow, thereby reducing infrastructure costs and enhancing grid utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If DC fast charging stations are deployed to meet growing EV charging demand, then charging speed and convenience are improved, but infrastructure cost and grid loading increase significantly
Solution Approach 1:
The patent enables service transformers to perform dual functions: their traditional power distribution role and new EV charging role. By allowing transformers to dynamically switch between serving general grid loads and dedicated EV charging, the infrastructure achieves multi-functionality without requiring separate dedicated charging infrastructure, thereby reducing overall infrastructure investment while maintaining fast charging capability
Solution Approach 2:
The system dynamically adjusts transformer functionality based on real-time grid conditions and charging demand. Transformers can transition between different operational states (traditional service vs. EV charging mode) depending on availability and demand signals, enabling flexible resource allocation that reduces the need for static over-provisioning of infrastructure
2Quantity of substance
If service transformers are utilized for EV charging, then infrastructure cost is reduced, but transformer thermal management and reliability become critical concerns
Solution Approach 1:
The patent implements continuous monitoring of transformer thermal and electrical parameters with real-time feedback control. When transformers are assigned to EV charging, the system monitors their temperature, load, and operational status, dynamically adjusting charging rates or terminating assignments when thermal limits are approached, thereby maintaining reliability while enabling cost-effective infrastructure utilization
Solution Approach 2:
The system establishes thermal margins and operational buffers before assigning transformers to EV charging duties. By pre-defining safe operating thresholds and maintaining thermal cushions, the system prevents transformers from operating at dangerous temperature levels, ensuring reliability is maintained even when utilizing existing infrastructure for dual purposes
Data Source
AI summary
An exemplary embodiment of the present disclosure provides a method for charging electric vehicles using service transformers on an electric utility grid. The method can comprise monitoring one or more electrical and/or thermal properties of a plurality of service transformers on an electric utility grid, and based on the monitored one or more electrical and/or thermal properties, determining that one or more of the plurality of service transformers have capacity to charge an electric vehicle.