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There are zero sequence circuits, when inverters work in parallel directly, and zero sequence circulating current would flow, when zero sequence voltage of the inverter is different with that of the gird. The mechanism of the zero sequence circulating current is analyzed. By the analysis of the influence of the power switch tube voltage-drop, the dead time of PWM and the most common two PWM methods...
This paper has researched on the control strategy of PMSG direct-drive tidal generation system with LCL filter. Firstly, the model of PMSG (permanent magnet synchronous generator) with LCL filter is established in dq-frame, and then according to the analysis of the model, the equivalent circuit and admittance seen from the converter side in dq-frame is obtained. The bode figure shows that the LCL...
This paper introduces the basic modes of image parallel processing, and analyzes the parallel processing ability and stream program mode of GPU. At the same time, in view of the hyperspectral remote sensing data due to the large amount of data caused by the operational characteristics of a long time, we study feature extraction of hyperspectral remote sensing algorithms of parallel strategy, especially...
Current video on demand system requires a large number of users and a huge number of video files, then mounts of concurrent address on media server will burst the bandwidth requirements and content provider will pay more and more cost on it. Accordingly, new schemes to offload burden from media server becomes a crucial item. In this paper, we introduce a new topology based on two hierarchical DHT...
In order to improve the performance of power converters based interconnected system, input and output impedance of power converter are employed to investigate the cause leads to interaction in a typical cascade system, detail theoretical analyse is presented in this paper, then some practical design guide lines are induced to attenuate the interaction among power converters, by applying these rules,...
The problems about guaranteeing robustness of decoupling control of induction motor and shortage of conventional robust control approaches in considering nominal and robustness performance synchronously are introduced. In order to solve these problems, principle and structure of generalized internal model control (GIMC) based two-degree-of-freedom (2DOF) is studied, the design methods of robust control...
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