Battery Management Control for Generator-Started Site Cooling
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Solution Overview
Problem
In off-grid or weak-grid telecommunications facilities, maintaining ambient temperature without incurring the high cost and complexity of installing a DC-AC inverter is challenging, especially when diesel generators are off and battery power is being discharged, as AC-powered air conditioning units cannot operate without AC power.
Innovation Solution
A hybrid generator-battery system with temperature sensors communicatively coupled to a battery management system that monitors ambient temperature and sends a start-up command to the AC engine-generator set when the temperature reaches a threshold, enabling the generator to provide AC power to air conditioning units without the need for an inverter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a DC-AC inverter is installed to enable air conditioning operation during battery discharge, then the air conditioning unit can operate without AC power, but the installation cost and system complexity increase significantly
Solution Approach 1:
The patent introduces a temperature monitoring system as an intermediary between the battery management system and the air conditioning unit. The temperature sensor continuously monitors ambient temperature and communicates with the battery management system, which then triggers generator startup when temperature thresholds are exceeded. This intermediary monitoring approach enables indirect control of air conditioning operation without requiring a DC-AC inverter, thus maintaining system simplicity while achieving the desired operational capability.
2Temperature
If the air conditioning unit is controlled by a separate thermostat during generator operation, then the ambient temperature is maintained within limits, but the system cannot respond to temperature changes when the generator is off and battery is discharging
Solution Approach 1:
The patent integrates temperature monitoring functionality into the battery management system, giving it multiple functions: monitoring battery state of charge, monitoring ambient temperature, and controlling both battery discharge and generator startup operations. This multi-functional approach allows the system to respond to temperature changes during battery discharge operations without requiring separate control systems, thereby improving system versatility while maintaining efficient operation.
3Ease of operation
If the generator is kept running continuously to provide AC power, then the air conditioning unit can operate without interruption, but fuel consumption increases
Solution Approach 1:
The patent implements periodic generator operation based on temperature thresholds rather than continuous operation. The generator starts when the temperature exceeds a predetermined threshold and stops when the temperature drops below a lower threshold. This periodic operation pattern ensures reliable air conditioning operation during critical periods while minimizing fuel consumption during cooler periods when cooling is not required, achieving an optimal balance between operational reliability and energy efficiency.
Data Source
AI summary
A system and method for controlling ambient temperature at a power-consuming site includes a hybrid generator-battery power system. The generator-battery power system includes an engine-generator set and one or more DC-powered batteries that alternately share the site load. Thus, the method includes providing one or more temperature sensors communicatively coupled to a battery management system at the power-consuming site. Another step includes monitoring the ambient temperature of the power-consuming site via the one or more temperature sensors when one or more of the DC-powered batteries are discharging (i.e. when the engine-generator set is off). The method also includes sending, via the battery management system, a start-up command to the engine-generator set when the ambient temperature of the power-consuming site reaches a threshold temperature such that the engine-generator set can provide AC power to an air conditioning unit at the power-consuming site.