Muhammad ibrar younas | Beijing JiaoTong University (original) (raw)
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Papers by Muhammad ibrar younas
2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2), 2020
In this paper, a new three-phase single stage AC to DC buck converter with low switch count and h... more In this paper, a new three-phase single stage AC to DC buck converter with low switch count and high power processing capability is investigated for the electric and hybrid-electric vehicle battery charging system. The modes of operation of the proposed system are investigated. Small signal modeling of the converter is derived to get the transfer function of the system. The operation of the proposed converter is verified with dynamic simulation and preliminary experiments. The efficiency and the total harmonics distortion (THD) of the proposed converter is compared with other conventional charging system. The proposed system is an attractive candidate for fast charging systems.
Stability analysis Stability is the most important system specification. If a system is unstable,... more Stability analysis Stability is the most important system specification. If a system is unstable, transient response and steady-state errors are moot points. An unstable system cannot be designed for a specific transient response or steady-state error requirement. What is stability? There are many definitions for stability, depending upon the kind of system or the point of view. In this section we limit ourselves to linear time-invariant systems. The total response of a system is the sum of the forced and natural responses, or () () () forced natural c t c t c t Using these concepts, we present the following definitions of stability, instability and marginal stability. A linear, time-invariant system is stable if the natural response approaches zero as time approaches infinity. A linear, time-invariant system is unstable if the natural response grows without bound as time approaches infinity.
2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2), 2020
In this paper, a new three-phase single stage AC to DC buck converter with low switch count and h... more In this paper, a new three-phase single stage AC to DC buck converter with low switch count and high power processing capability is investigated for the electric and hybrid-electric vehicle battery charging system. The modes of operation of the proposed system are investigated. Small signal modeling of the converter is derived to get the transfer function of the system. The operation of the proposed converter is verified with dynamic simulation and preliminary experiments. The efficiency and the total harmonics distortion (THD) of the proposed converter is compared with other conventional charging system. The proposed system is an attractive candidate for fast charging systems.
Stability analysis Stability is the most important system specification. If a system is unstable,... more Stability analysis Stability is the most important system specification. If a system is unstable, transient response and steady-state errors are moot points. An unstable system cannot be designed for a specific transient response or steady-state error requirement. What is stability? There are many definitions for stability, depending upon the kind of system or the point of view. In this section we limit ourselves to linear time-invariant systems. The total response of a system is the sum of the forced and natural responses, or () () () forced natural c t c t c t Using these concepts, we present the following definitions of stability, instability and marginal stability. A linear, time-invariant system is stable if the natural response approaches zero as time approaches infinity. A linear, time-invariant system is unstable if the natural response grows without bound as time approaches infinity.