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A hybrid pulsewidth modulation (PWM) scheme for the grid inverter is investigated, which combines the merits of space-vector PWM (SVM) and selected harmonic elimination PWM (SHEPWM). SHEPWM is adopted at steady state, while SVM is adopted to achieve better dynamic performance at grid fault. A transition strategy between these two PWM schemes is proposed, which achieves smooth and quick transition...
In this paper, we present a novel non-classical NMOS transistor with elevated body and spacer to replace the conventional PMOS for CMOS circuits. By calibrating the parameters from the real measurement for the simulations, the novel non-classical NMOS transistor shows a PMOS-like behavior. The proposed unipolar CMOS can reduce the propagation delay time (TP) and power dissipation (PD). The simulation...
This paper investigates power control to regulate both inputs of dual-input DC/AC inverter independently. The dual-input DC/AC inverter topologies can be either neutral point clamp (NPC) or T-type three-level inverter. A mathematical model is established to derive the relationship between the dual-input power and the duty cycle of the DC/AC inverter. Then a control scheme is proposed to decouple the...
Due to the presence of the low-order background voltage harmonics in the grid, it will cause higher current harmonics in the AC side of the grid inverter with Selective Harmonic Elimination PWM (SHEPWM). Therefore the grid inverter with traditional SHEPWM has not prevailed since it is unable to overcome the background harmonics of the utility and satisfy the power quality requirement. In this paper,...
A hybrid PWM scheme for the grid inverter is investigated, which combines the merits of space-vector PWM (SVM) and Selected Harmonic Elimination PWM (SHEPWM). SHEPWM is adopted at steady state while SVM is adopted to achieve better dynamic performance at grid fault. A transition strategy between these two PWM schemes is proposed, which achieves smooth and quick transition by optimizing the switching...
With the proliferation of alternate power sources such as fuel cells system in the distributed power system, inverter is the key component of the system. Parallel inverter systems can be designed to have the advantages to improve output power and reliability etc. In order to share the load and restrain circumfluence, A power sharing control technique for inverter parallel operation is described in...
In this paper, a modelling method for the parallel operation of inverters in a micro-grid system is proposed. Conventionally, the droop method has been applied to achieve a simple structure and no-interconnections among power sources. The small signal model of the wireless parallel inverter allows obtaining the behaviour of the system in function of frequency and voltage droop. The model is simple...
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