Feeder Voltage Compensation Battery Low-Temperature Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries used in feeder voltage compensation systems experience reduced chargeable and dischargeable power at low temperatures due to increased internal resistance, leading to decreased availability and efficiency.
Innovation Solution
The system adjusts the discharging start voltage of the secondary battery to a higher value when the temperature drops, and alternately controls two voltage compensation apparatuses to conduct charging and discharging, expanding discharging start conditions and reducing internal resistance, thereby improving power availability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a secondary battery is used in the power saving apparatus, then the device can store and discharge energy effectively, but the internal resistance value becomes large at low temperatures, restricting chargeable and dischargeable power and lowering device availability
Solution Approach 1:
The patent changes the voltage parameter dynamically based on temperature conditions. When the secondary battery temperature is below a predetermined threshold, the discharging start voltage is raised from the normal level to a higher value, allowing the battery to discharge earlier and more aggressively to compensate for the increased internal resistance and maintain adequate power delivery capability.
2Power
If the discharging start voltage is raised to promote discharging at low temperatures, then chargeable and dischargeable power is improved, but energy losses increase
Solution Approach 1:
The patent implements dynamic voltage adjustment based on real-time temperature monitoring. The discharging start voltage is not fixed but adapts to temperature conditions: it is raised only when the temperature falls below a predetermined threshold, and returns to normal when temperature recovers. This dynamic approach ensures adequate power delivery at low temperatures while minimizing unnecessary energy losses during normal operating conditions.
3Reliability
If two voltage compensation apparatuses are controlled to conduct charging and discharging alternately, then the internal resistance is reduced and power availability is improved, but the control complexity increases
Solution Approach 1:
The patent implements periodic charging and discharging cycles between two voltage compensation apparatuses when temperature is low. The system alternates which apparatus discharges to the feeder, allowing the idle apparatus to recover and maintain lower internal resistance. This periodic alternation pattern ensures continuous adequate power availability while managing the thermal states of both batteries through a relatively simple control logic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the charging and discharging power of the secondary battery, ensuring stable operation even at low temperatures, and reduces energy losses, thus improving the overall availability and efficiency of the feeder voltage compensation system.
Implementation Method 1
a secondary battery is connected to a feeder of an electric railroad via a power converter to absorb surplus power on the feeder and supply power from a secondary battery in response to power demand
Data Source
AI summary
An energy saving type feeder voltage compensation apparatus improved in availability at low temperatures, wherein when a secondary battery is lower in temperature than a predetermined value, an output voltage output to a feeder side is made equal to or higher than a no-load output voltage of a substation connected in parallel. Power is supplied to a power running rolling stock preferentially from the secondary battery. The heating value of the secondary battery is increased and the battery temperature is raised by this discharging, whereby internal resistance of the secondary battery is lowered, and the charging and discharging loss is suppressed, and the efficiency and availability of the energy saving type feeder voltage compensation apparatus as a whole are improved.