Hybrid Energy Storage System Control for Power-Split Hybrid Vehicles Using Nonlinear Damped PI Controller
This study introduces a hybrid energy storage system for power-split hybrid vehicles, combining lithium-ion batteries and ultracapacitors. A control framework utilizing an indirect power balance law and a nonlinear damped PI controller is presented. The ultracapacitor manages high-frequency transients while the battery provides mid-frequency energy. Performance improvements include reduced voltage undershoot from 12% to 3%, overshoot below 1.5%, and enhanced torque delivery with a 25% reduction in current ripple.
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The paper details a hybrid energy storage system (HESS) for power-split hybrid vehicles, integrating a lithium-ion battery and an ultracapacitor. It employs an indirect power balance law and a nonlinear damped PI controller to regulate DC-link voltage effectively.
The ultracapacitor addresses high-frequency transients, while the battery supports mid-frequency energy needs. Key improvements include a reduction in voltage undershoot from 12% to 3%, overshoot below 1.5%, and faster convergence times. Current ripple is reduced by 25%, leading to more robust power-split operations.
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