Operation of Cascaded H-bridge-Based Split-Battery Energy Storage System With Reduced Sensors

In the conventional cascaded H-bridge-based splitbattery energy storage (CHB-SBES) system, the dc-bus voltages are measured for state-of-charge (SoC) balancing and charge/discharge control of battery packs, and multilevel voltages are sensed for open-circuit (OC) fault detection in the submodules. I...

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Bibliographic Details
Main Authors: Yadav Gorla, Naga Brahmendra, Ghias Farivar, Glen, Liang, Gaowen, Beniwal, Neha, Ezequiel, Rodriguez Ramos, Pou, Josep
Format: Conference Proceeding
Language:English
Subjects:
Cascaded H-bridge
Fault detection
fault detection and localization
fault diagnosis
Power supplies
Sensor systems
Sensors
Split battery energy storage
Switches
Threshold voltage
Voltage measurement
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Summary:In the conventional cascaded H-bridge-based splitbattery energy storage (CHB-SBES) system, the dc-bus voltages are measured for state-of-charge (SoC) balancing and charge/discharge control of battery packs, and multilevel voltages are sensed for open-circuit (OC) fault detection in the submodules. In this paper, a new control approach is proposed where the multilevel voltage measurement of the CHB-SBES system alone is utilized for control (i.e., SoC balancing and charge/discharge control) as well as fault detection. The dc-bus voltage of each submodule is estimated from the measured multilevel voltages, gating signals and grid currents for control purposes. Further, to localize OC faults within a fundamental line cycle, a simplified fault detection method is proposed using the estimated dc-bus voltages. The proposed method eliminates n dc-bus voltage sensors per phase and the associated sensor power supplies in CHB-SBES system, where n is the number of submodules per phase. Results from MATLAB-Simulink model are presented to validate the proposed method.
ISSN:2150-6086
DOI:10.1109/ECCE-Asia49820.2021.9479163