Battery Voltage Feedback Limits in Power Conditioning Control
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Solution Overview
Problem
Conventional power conditioning subsystems lack the ability to obtain operation information such as state of charge (SOC) of storage batteries, leading to potential overcharge or overdischarge issues.
Innovation Solution
A power conditioning subsystem that includes an inverter circuit, a command value acquiring portion, a DC voltage acquiring portion, and a limiter processing portion to set upper and lower limits on charging and discharging commands based on the storage battery's DC voltage, preventing overcharge or overdischarge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power conditioning subsystem operates according to charging and discharging instructions from a higher-level apparatus, then the system can be controlled to charge and discharge the storage battery, but overcharge or overdischarge may occur in the storage battery
Solution Approach 1:
The control unit continuously monitors the DC voltage of the storage battery and uses this feedback to dynamically adjust the command value limits. When the DC voltage approaches critical thresholds, the control unit automatically modifies the upper and lower limits of the command value to prevent overcharge or overdischarge, ensuring both operational control and battery safety
Solution Approach 2:
The patent implements dynamic limit adjustment where the upper and lower limits of the command value are not fixed but change based on real-time DC voltage conditions. This dynamic adaptation allows the system to maintain safe operating boundaries while maximizing charging and discharging efficiency under varying battery states
2Reliability
If the power conditioning subsystem acquires operation information such as SOC of the storage battery, then overcharge or overdischarge can be prevented, but the system configuration becomes more complex
Solution Approach 1:
The control unit utilizes the DC voltage information that is already inherently available from the storage battery's normal operation. Instead of requiring additional sensors or complex SOC estimation systems, the control unit processes the existing DC voltage data to determine appropriate command value limits, achieving battery protection through self-service using available information
Solution Approach 2:
The patent changes the parameter used for protection from complex SOC (state of charge) calculations to the simpler DC voltage parameter. By monitoring DC voltage thresholds and adjusting command limits based on this single parameter, the system achieves reliable battery protection without the complexity of multiple sensors or sophisticated SOC estimation algorithms
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
Prevents overcharge or overdischarge of storage batteries with a simple configuration by dynamically adjusting charging and discharging limits based on battery voltage.
Implementation Method 1
an inverter circuit configured to mutually covert direct current (DC) power of a storage battery and alternating current (AC) power
Data Source
AI summary
A power conditioning subsystem (PCS) includes an inverter circuit configured to mutually covert direct current (DC) power of a storage battery and alternating current (AC) power, a command value acquiring portion configured to acquire a command value from a higher-level apparatus to charge or discharge the storage battery, a DC voltage acquiring portion configured to acquire a DC voltage on the storage battery side, and a limiter processing portion configured to perform a process of setting to limit each of an upper limit and a lower limit of the command value acquired by the command value acquiring portion on the basis of the DC voltage acquired by the DC voltage acquiring portion.