Power Storage Control for PCS Unstable Range Charging
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Solution Overview
Problem
Existing power storage systems face challenges in accurately controlling charge and discharge power, leading to frequent stop events and inefficient operation due to measurement errors and unstable power ranges, particularly near full charge or discharge states.
Innovation Solution
A power storage source management apparatus with a sensor unit to measure operational characteristics and a control unit that determines operating power limits, implementing threshold-based control logic to prevent operation stops by adjusting charge/discharge power within stable ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the charge power or discharge power is monitored using voltage and current measurement sensors with 1% error, then the power control can be performed, but the power control accuracy is lowered when the charge power and discharge power is low (below 50 kW)
Solution Approach 1:
The patent changes the control parameter from absolute power values to power deviation from reference values. By monitoring the difference between actual power and reference power (P_ref) rather than absolute power levels, the system maintains control accuracy across the full power range including low power operations where measurement errors would otherwise be significant.
2Reliability
If the management apparatus stops charging/discharging when the charge power or discharge power is 10 to 20% larger than the operating power limit, then safety is ensured, but the power storage source stops working before full charge or discharge is achieved
Solution Approach 1:
The patent implements dynamic control thresholds that adapt based on operating conditions. The stop conditions are not fixed percentages above the power limit but are dynamically adjusted based on the unstable power range detection and power deviation from reference values, allowing safe operation while maximizing charge/discharge completion.
Solution Approach 2:
The system continuously monitors power deviation from reference values and uses this feedback to adjust control decisions. By comparing actual power against reference power and detecting unstable ranges, the system provides feedback that prevents premature stopping while maintaining safety margins.
3Ease of operation
If the PCS operates in the unstable power range where measurement errors are significant, then low power operations can be performed, but frequent charge/discharge stop events occur
Solution Approach 1:
The patent introduces an intermediary control layer that mediates between the PCS and power storage source. This intermediary monitors for unstable power ranges and manages transitions through these regions by controlling the rate of power change, allowing the system to pass through unstable ranges without triggering premature stop events.
Data Source
AI summary
A management apparatus, includes a control unit for acquiring operational characteristics information of a power storage source from a sensor unit and determining an operating power limit of the power storage source, determining a charge power or discharge power of the power storage source using the operational characteristics information during operation of the power storage source, stopping the operation of the power storage source in response to the charge/discharge power being larger than a preset unstable power range of a Power Conversion System (PCS) and being larger than the operating power limit by a first threshold, and stopping the operation of the power storage source in response the charge/discharge power being within the preset unstable power range of the PCS and being larger than the operating power limit by a second threshold being larger than the first threshold.