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The cascade H-bridge topology is novel for the battery energy storage system (BESS). A multi-level battery management system (BMS), which contains three subsystems, is introduced. The functions and communication of each subsystem are discussed. An algorithm based on extended Kaiman filter is used for the state-of-charge (SOC) estimation in battery modules. The pack SOC is derived from those of the...
Extended Kalman filter (EKF) is a typical method for state-of-charge (SOC) estimation of lithium batteries. An equivalent circuit model for the lithium battery is established, and model parameters are identified by experimental methods. Based on the battery model and model parameters, an EKF is proposed for SOC estimation. Analysis is conducted on the effect of the model coefficients of EKF to the...
Internal resistance is an important element for lithium-ion batteries in battery management system (BMS) for battery energy storage system (BESS). The internal resistance consists of ohmic resistance and polarization resistance. Neither of them can be measured directly and they are identified by some algorithms with battery charging/discharging experiment data. In this paper, several 10Ah LiFePO4...
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