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This paper describes an integrated model for a Photon Exchange Membrane (PEM) fuel cell generator including the power conditioning devices that can be used as a micro grid. The main focus here is the development of a detailed model of the fuel cell, power conditioning devices and a Voltage Source Inverter (VSI) with no major assumptions. To this end nonlinear models for PEM fuel cell generator, power...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
In this paper, the switching flow-graph (SFG) modeling technique is used to build the large-signal model of a cascaded multilevel inverter. With the concept of virtual switch and virtual switching function proposed in SFG modeling technique, the large-signal SFG model of a cascaded multilevel inverter can be derived easily and without complex mathematic works. The SFG model can also be implemented...
With a common DC bus, the grid-connected inverter (GCI) modules are directly paralleled. The principle of the zero-sequence circulating current (ZSCC) is analyzed. A ZSCC control scheme is proposed which does not impact the other control objectives such as the active and reactive power transmitted from the grid-connected inverter to the gird. A simulation model of a paralleled inverter with three...
In this paper, a novel topology of APFC with on-line half-bridge UPS controlled by DSP is presented. The operation principle is analyzed. In order to improve the dynamic response feature of APFC and make the design of LC filter easy, improved current hysteretic control is proposed. A digital control scheme based on DSP is presented. The control model of APFC is simulated with Matlab. In order to verify...
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