BEV TRU Charging Control Under Grid Power Limits
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Solution Overview
Problem
The existing electrical grid network faces strain due to the simultaneous power draw from transport refrigeration units (TRUs) during charging operations of battery electrical vehicles (BEVs), leading to potential grid shutdowns and inefficiencies in power management, particularly as the demand for optimized power supply increases with the rise of BEVs.
Innovation Solution
A vehicle charging system with a master device connected to the primary grid network, which communicates with slave devices in BEVs to monitor and manage power consumption, calculates total power usage, and regulates power allocation among TRUs to prevent overload, allowing for priority requests and efficient recharge management through real-time data processing and communication protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TRUs are simultaneously connected to the electrical grid for charging, then the charging speed and power availability improve, but the grid network becomes overloaded and may shut down
Solution Approach 1:
The system dynamically adjusts the power allocation to each TRU based on real-time monitoring of total power consumption and grid capacity. The master device continuously receives power consumption data from slave devices and modifies charging parameters to maintain operation below the saturation point, enabling flexible adaptation to changing conditions while preventing grid overload.
Solution Approach 2:
The system implements a feedback mechanism where the master device receives real-time power consumption data from multiple slave devices, calculates total power usage, compares it against the maximum allowed power, and adjusts power allocation accordingly. This closed-loop control ensures the system responds to actual grid conditions and prevents overload while maximizing charging efficiency.
2Reliability
If the system regulates power allocation to prevent grid overload, then grid reliability is maintained, but the total power available for charging is reduced
Solution Approach 1:
The system allocates power to TRUs in a controlled manner, allowing each unit to receive sufficient power for its operational needs while ensuring the aggregate remains within safe limits. The master device distributes available power capacity among connected TRUs, enabling each to operate effectively without exceeding the grid's maximum capacity, thus achieving partial optimization for each unit while maintaining overall reliability.
3Measurement precision
If the system monitors and calculates total power consumption in real-time, then power management precision improves, but the system complexity increases
Solution Approach 1:
The master device performs multiple functions including receiving power consumption data from multiple slave devices, calculating total power usage, determining probability of exceeding maximum power, regulating power allocation, and communicating with the grid operator. This centralized multi-functional approach consolidates complexity into a single coordinating unit while enabling precise power management across the entire system.
Data Source
AI summary
A method for managing power supply during charging operation of BEVs. The method includes establishing a communication with each of the slave devices installed in the BEVs and receiving input data from the slave devices in real-time via a communication interface. The method further includes calculating a total power currently utilized by a plurality of TRUs based on the received input data and determining a probability whether the calculated total power exceeds a maximum allowed power provided by the primary grid network during the charging operation in case a new charging request is received from a new slave device. Thereafter, the method further includes regulating, based on the determined probability, a power allocation of a group of TRUs among the plurality of the TRUs such that the total calculated power remains below a saturation point of the maximum allowed power.