Hybrid Control of PV-FC Electric Vehicle using Lyapunov based Theory

Abstract

Lyapunov based control is used to test whether a dynamical system is asymptotically stable or not. The control strategy is based on linearization of system. A Lyapunov function is constructed to obtain a stabilizing feedback controller. This paper deals with Lyapunov based control of multiple input single output system for hybrid electric vehicles (HEVs). Generally, an electric vehicle has an energy management system (EMS), an inverter, a DC-DC converter and a traction motor for the operation of its wheels. The control action is applied on the DC-DC converter, which works side-by-side with the EMS of the electric vehicle. The input sources considered in this study are: photo-voltaic (PV) panel, fuel cell and high voltage lithiumion (Li-ion) battery. PV cell and fuel cell are considered as the primary sources of energy and the battery is considered as the secondary source. The converter used is a DC-DC boost converter which is connected with all the three sources. The idea follows the basic HEV principle in which multiple sources are incorporated to satisfy the power demands of the vehicle, using a DC-DC converter and an inverter, to operate its traction motor. The target is to achieve necessary tracking of all input source currents and output voltage, and fulfill the power demand of the HEV under severe load transients. The operations of the DC-DC converter are divided into three stages, each representing a different combination of the input sources. The analysis and proof of the stability of the HEV system is done using the Lyapunov stability theory.The results are discussed in the conclusion.

Modeling and Experimental Investigation of Energy Management for Hybrid Electric Vehicle based on Variable Structure Control Strategy

“…Therefore, HESS has to be combined with renewable energy sources to overcome this problem. Another shortcoming in the literature is lack of consideration for energy losses and vehicle dynamic characteristics including braking and vehicle's mechanical transmission losses [9][10][11] which could greatly impact the overall operation of vehicular system.…”

Study on the Control of Torque Distribution of 4WD Corn Harvester Operation Drive

“…The research on inter-wheel torque control of the same axle mainly includes the design of differential structure [16][17][18], torque distribution control research, and simulation analysis [19,20]. The research on integrated control mainly focuses on the proposed control strategy and simulation analysis [21][22][23][24]. It has been proved that 4WD torque distribution control could effectively improve the traction, passing ability, and driving stability of the travel machinery.…”