Storage Battery Controller for Accurate Power Leveling
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Solution Overview
Problem
Conventional storage battery equipment faces challenges in accurately supplying electric power for load leveling due to inefficiencies in power conversion, where conversion efficiencies of inverters and converters vary, leading to potential over-discharging and mismatched power supply during charging and discharging.
Innovation Solution
The storage battery equipment includes a controller that sets a target discharge or charge amount and uses the power output from the inverter as a control value, ensuring that the actual power supplied or drawn matches the target value by accounting for conversion efficiencies, thereby preventing excess discharging and ensuring accurate power leveling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the controller controls the converter such that the amount of power extracted from the storage battery matches the target value, then the power extraction control is simplified, but the actual power supplied to the building is less than the target value due to conversion losses
Solution Approach 1:
The controller measures the actual power output from the inverter and uses this feedback to adjust the control signal to the converter. This closed-loop feedback mechanism compensates for conversion losses by continuously monitoring the actual power supplied to the building and adjusting the power extraction from the storage battery accordingly, ensuring the target power supply accuracy is achieved.
Solution Approach 2:
The inverter acts as an intermediary between the storage battery and the building load. By controlling the inverter's output power rather than directly controlling the converter's input power, the system uses the inverter as a mediator to achieve precise power supply control. The inverter's conversion efficiency characteristics are accounted for in this indirect control approach.
2Measurement precision
If the target value for power extraction is increased to compensate for conversion losses, then the actual power supplied approaches the target value, but the storage battery may deteriorate from excess discharging
Solution Approach 1:
The feedback control mechanism precisely adjusts the power extraction based on actual inverter output, preventing both under-supply and over-extraction. By continuously monitoring actual power delivery and adjusting the converter control signal accordingly, the system extracts exactly the right amount of power to meet the target without excessive discharging that would damage the battery.
Solution Approach 2:
The control system dynamically adjusts the power extraction target based on real-time operating conditions including converter and inverter efficiency characteristics. Rather than using a fixed compensatory target value, the system adapts the extraction amount to actual performance, optimizing both power supply accuracy and battery protection under varying load and environmental conditions.
3Device complexity
If conversion efficiency is treated as a fixed value for control calculations, then the control system is simplified, but prediction accuracy deteriorates when efficiency varies with load factor and temperature
Solution Approach 1:
Rather than relying on predicted or fixed conversion efficiency values, the system uses feedback from actual power measurements to determine the effective efficiency in real-time. This eliminates the need for complex predictive models while maintaining high accuracy, as the feedback loop continuously updates the control based on actual performance regardless of load factor or temperature variations.
Solution Approach 2:
The control system adapts to changing efficiency parameters by using measured output power to infer the actual conversion efficiency under current operating conditions. Instead of assuming fixed efficiency parameters, the system allows the effective efficiency parameter to change dynamically based on actual measurements, accommodating variations due to load factor, temperature, and other environmental factors.
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 allows for precise and efficient power supply and charging, effectively leveling electric power demand while preventing storage battery deterioration from excess discharging, ensuring that the power supplied to the building matches the intended target values.
Implementation Method 1
a converter that extracts direct current power from the storage battery, converts a voltage of the direct current power, and outputs the direct current power
Implementation Method 2
an inverter that converts the direct current power outputted from the converter into an alternating current power, and supplies the alternating current power to the building
Data Source
AI summary
A storage battery equipment includes a converter, a system interconnection inverter, and a controller. The converter extracts direct current power from a storage battery, then converts a voltage of the direct current power and outputs the direct current power. The system interconnection inverter converts the direct current power outputted from the converter into an alternating current power. The controller controls the system interconnection inverter such that an amount of power output from the system interconnection inverter to a load matches a preset target discharge amount.