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As the output unit of variety distributed generation systems, the final power quality is determined by three-phase four-leg inverter. For the three-phase four-leg inverter, this paper presents a dynamic reference voltage hysteresis control scheme. Firstly, based on the existing hysteresis comparison method, this method improves the systems control rapidity and stability through designing differential...
The theory, design, and implementation of a constant-frequency hysteresis current control for grid-connected voltage source inverter (VSI) is presented. The proposed control technique retains the benefit of the hysteresis control having fast dynamic response and tackles the drawback of the standard hysteresis control having variable switching frequency. The concept is based on predicting the current...
The losses of a voltage source inverter depend on the converter topology and the characteristics of semiconductor power switches, the control system, the inverter current control (modulation) algorithm and DC link voltage level. Significant component of overall losses are the switching losses of voltage source inverters (which are proportional to the switching frequency). Based on simulation results,...
Aiming at the single-phase current five-level inverter, the thesis analyzes the reasons for unbalanced inductor current, introduces some types of present strategies for balancing the inductor current through current sharing, and points out separately the current sharing principles for these strategies, comparing their advantages and shortcomings and then puts forward a new strategy for hysteresis...
This paper deals with control strategies and reconfiguration needed to maintain PMSM drives in operation after a fault leading to a single-phase open circuit has occurred. The considered drive is composed of a three-phase star-connected machine and a four-leg voltage-source inverter, the fourth leg being permanently connected to the neutral point of the machine. We investigate different current and...
Inverter system, as the interface device between the renewable energy system and grid, plays an important role in the distributed generation system. A double-mode single-phase inverter system, which can be operated in grid-connected mode or stand-alone mode with seamless transitions control, is proposed in this paper. The different control strategies applied on the system for the different modes are...
Inverter system, as the interface device between the renewable energy system and grid, plays an important role in the distributed generation system. A double-mode single-phase inverter system, which can be operated in grid-connected mode or stand-alone mode with seamless transitions control, is proposed in this paper. The different control strategies applied on the system for the different modes are...
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