Nonlinear dynamic modeling and stability analysis of electric vehicles

Alexandridis, Antonio T.; Makrygiorgou, Jemma J.

doi:10.1109/acc.2016.7524986

Cited by 5 publications

(2 citation statements)

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“…In the present case, the most popular for EV applications Li-ion batteries are considered [45] and a PMSM provides the needed torque on the car wheels. The power absorbed by the batteries or injected into the system is controlled by a DC/DC bidirectional boost converter, while the PMSM is driven through a three phase AC/DC voltage source converter [43]. It is well-known that a DC/DC boost converter is usually employed in HEVs where a smaller battery pack is used.…”

Section: Ev System Modelmentioning

confidence: 99%

“…Particularly, since in the present case, the desired equilibrium differs from the origin and nonzero values are expected in steady state for the external inputs, the incremental model of the system around the equilibrium is firstly obtained. The original system is an Euler-Lagrange nonlinear system [43] and as it is proven in the paper, also the incremental model [44] can be in the form of an Euler-Lagrange system with the inner-loop controllers involved. Furthermore, to proceed with the stability analysis of the entire system, Lyapunov techniques are applied which at a first stage prove global asymptotic stability (GAS) to the origin by suitably tuning the inner-loop controllers gains.…”

Section: Introductionmentioning

confidence: 96%

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Power Electronic Control Design for Stable EV Motor and Battery Operation during a Route

Makrygiorgou

Alexandridis

2019

Energies

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Electric vehicles (EVs), during a route, should normally operate at the desired speed by effectively controlling the power that flows between their batteries and the electric motor/generator. To implement this task, in this paper, the voltage source AC/DC converter is considered as a controlled power interface between the electric machine and the output of the DC storage device; the DC/DC converter is used to automatically regulate the battery operating condition in accordance to the profile of the acting on the vehicle wheels, unknown external torque. Particularly, the speed is continuously regulated by the vehicle driver via the pedal while all other regulations for absorbing or regenerating energy are internally controlled. The driver command is acting as speed reference input on a PI outer-loop motor speed controller which, in its turn, drives a fast P inner-loop current controller operating in cascaded mode. In a similar manner, the machine and the battery performance are self-regulated by a pure PI current controller that achieves maximum electric torque per ampere operation of the motor and by a PI/P cascaded scheme for the DC-voltage/battery–current regulation, respectively. In order to exclude any possibility of instabilities and adverse impacts between the different parts, a rigorous analysis is deployed on the complete electromechanical system that involves the motor, the batteries, the converter dynamic models and the proposed controllers. Modeling the system in Euler–Lagrange nonlinear form and applying sequentially suitable Lyapunov techniques and the time-scale separation principle, a systematic method for tuning the gains of the inner- and outer-loop controllers is derived. Therefore, the proposed controller design procedure guarantees asymptotic stability by considering the accurate system model as a whole. Finally, the proposed approach is validated by simulating realistic route conditions, performed under unknown external torque variations.

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Section: Ev System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%