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Digital high-frequency arc welding inverter is widely used in welding areas because of its many advantages such as high efficiency, small size, easy to control etc. However, with the development of high frequency of the switching, the conducted EMI generated by arc welding inverter becomes increasingly serious, especially common mode conducted EMI. Based on Digital Active EMI Filter (DAEF) controller,...
As an important part of the distributed power generation system, grid-connected inverter has been widely used. However, as a time-varying nonlinear system, the grid-connected inverter has complex dynamic behavior, which can cause serious stability problem. As a consequence, more and more researches have focused on this issue, most of which are limited to the stability problem caused by the variations...
With the development of the renewable energy, grid-connected H-bridge inverter plays a more important role than ever. However, the dead-time and the zero crossing clamping (ZCC) effect caused by dead-time can cause THD problem. As a consequence, more and more researches have focused on this issue. Most of the researches use the harmonics to replace the effect of dead-time, which ignores ZCC effect...
Grid voltage distortion gives rise to extra grid current harmonics in grid-connected inverter system. To damp these harmonics, this paper proposes a novel control strategy in which inverter output current is regulated by PI controller and grid current is controlled by repetitive controller (RC) for three-phase grid-connected voltage source inverter (VSI) with LCL filter under d-q rotating frame. This...
In order to filter out the common-mode and differential-mode interference of DC/DC converter output power, restrain the power's ripple, reduce the transmitting interference of power, and increase the anti-interference ability and stability of power system, we analyze the internal structure of DC/DC converter, describe its working principle, and take mechanism analysis of the noise produced by it....
In order to sustain the stability of the power system, the power line carrier direction protection, as the main protection, is required to rapidly and exactly and selectively remove the fault in the high voltage or extra-high voltage system of our county. Thus directional relay used by protection equipment must be able to correctly and rapidly reflect the orientation of the fault site, namely positive...
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