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A Sliding Mode Observer Design for Fuel Cell Electric Vehicles
Induck Park,Sikyung Kim 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.2
This paper presents the sliding mode observer of an induction motor for the fuel cell electric vehicles. The exact rotor flux estimation of the induction motor is important for achieving the best performance from the fuel cell electric vehicle system. However, the flux estimator of the induction motor control is highly sensitive to the voltage sensor output characteristics and system parameter variation influenced by external factors. In order to eliminate these problems, this paper investigates the electric vehicle performance due to parameter variation of the induction motor. A new method to estimate the fuel cell electric vehicle system is proposed based on the sliding mode observer.
A Current Sharing Circuit for the Parallel Inverter
Changseok Lee,Sikyung Kim 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
The parallel inverter is popularly used<br/> because of its fault-tolerance capability, high-current outputs at constant voltages and system modularity. The conventional parallel inverter usually employs active and reactive power control or frequency and voltage droop control However, these approaches have the disadvantages that the response time of parallel inverter control is slow against load and system parameter variation to calculate active, reactive power, frequency and voltage This paper describes a novel control scheme for power equalization in parallel-connected inverter The proposed scheme has a fast power balance control response, a simplicity of implementation, and inherent peak current limiting capability since it employees an instantaneous current/voltage control with output voltage and current balance and output voltage regulation A design procedure for the proposed parallel inverter controller is presented. Furthermore, the proposed control scheme is verified through the experiment in various cases such as the system parameter variation, the control parameter variation and the nonlinear load condition.