Completely decentralized active balancing battery management system - 2017


The performance of a string of series-connected batteries is usually restricted by the worst cell within the string and a single failure point can render the whole string unusable. To address these issues, we present a decentralized battery management system with no communication requirement primarily based on a modular multilevel converter topology with a distributed inductor and distributed controller running on a local microprocessor. This configuration is known as a “smart cell.” By sensing the voltage across the native distributed inductor, each good cell is ready to: 1st, confirm its optimal switching pattern in order to attenuate the output voltage ripple; and second, modify its duty cycle to synchronize its state of charge (SOC) with the average SOC of the series string of cells. The decentralized controller comes using the theory of Kuramoto oscillators, and the steadiness of a system of smart cells is investigated. We tend to experimentally show that a system of three good cells with their decentralized controllers will accurately synchronize the SOC whereas minimizing their output voltage ripple.

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