Energy Storage Voltage Estimation With State-Error Correction

The patent implements feedback by calculating a correction value based on the error in the estimated state value and applying this correction to the estimated voltage value. The correction section uses the error information (from SOC estimation error or model identification error) to adjust the estimated voltage, creating a closed-loop feedback mechanism that continuously improves estimation accuracy without requiring complex real-time measurements.

The patent changes the parameter representation by introducing a correction value that accounts for estimation errors. Instead of directly measuring the difficult-to-obtain state values (SOC, internal resistance), the system estimates them and then applies parameter corrections based on the known errors in these estimates, transforming the estimation problem into a correction problem that can be solved more accurately.

The system maintains reliability by incorporating feedback from error calculations. The correction value is derived from the error in estimated state values (SOC error or model identification error), creating a feedback loop that compensates for the inherent unreliability of using estimated parameters, thereby maintaining high reliability while preserving operational ease.

The patent applies asymmetry by treating the error correction differently for charging and discharging operations. The correction value calculation considers the specific error characteristics of each operation mode, applying asymmetric correction strategies that account for the different error behaviors during charge versus discharge, thereby improving reliability across different operating conditions.