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Control Algorithm for Non-isolated Supercapacitor Based Kinetic Energy Recovery System



Author(s)

Luka Lopin, Slobodan Vukosavić and Nikola Lepojević

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DOI:10.17265/2328-2223/2018.03.006

This paper presents the control algorithm for supercapacitor based kinetic energy recovery system. Supercapacitor shares energy with the motor drive DC link through bidirectional non-isolated converter. Two cascaded linear regulators control feedback linearized states of the system. As a result, the DC link voltage is stabilized and the supercapacitor voltage and current are limited. Control algorithm does not increase ripple of voltages and currents, and thus life time expectancy of supercapacitor is prolonged. In torque-controlled motor drives, current on DC side can rapidly change with bandwidth as high as 2 kHz. Based on measurements of KERS states, the algorithm estimates rapidly changing motor drive current on DC side and stabilizes the DC link voltage with overshoot less than 2%. Controller is independent from the motor drive parameters and relies only on its own measurements. This enables kinetic energy recovery system (KERS) to be a standalone device.

Supercapacitor KERS, energy storage, regenerative braking, energy recovery, control system.