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The four-leg inverter is able to provide simultaneous power supply for three-phase or single-phase load with symmetrical voltage and constant frequency. The prerequisite is that the four-leg inverter must be controlled appropriately, so the synchronous rotating control strategy based on the decomposition sequence is proposed in this paper. Firstly, the inverter's mathematical model was given. Based...
This paper presents mathematical modeling procedure of three-phase grid-connected photovoltaic inverter. This paper presents synchronous PI current control strategy and the method for adjuster design. The typical waveforms of grid voltage, current and harmonics of grid current are carried out in a 100kW photovoltaic inverter, which can provide some guidelines for engineers to analyze, design and implement.
In order to make the design and optimization of solar energy systems convenient, it is very essential to choose the suitable engineering mathematic model of solar cells. A convenient and practicable engineering mathematic model of silicon solar cell is offered in this paper, which is based on photovoltaic array output I-U characteristic curve. Piecewise curve fitting method is also presented to simulate...
It is difficult to obtain a more precise mathematical model of parallel-inverter system with a nonlinear load. Nonlinear load is the general factor which affects output voltage total harmonic distortion (THD) and current sharing. But fuzzy controller can control well without a precise mathematical model. Master-slave control is used to control the parallel-inverter system in this paper. The voltage...
Auxiliary power supplies for traction rolling stock are used to power the carriage service facilities and control systems that are essential to keep a train operational. The design of converters for such applications is quite challenging, since the traction environment requires high performance systems that can manage a range of harsh environmental and electrical requirements without compromising...
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