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- 저자 : Muqin Tian (검색결과 2 건)
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Ye Zhang,Muqin Tian,Jiancheng Song,XiaoYu Zhang 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3
As the interface between new energy and power grid, the grid-connected LCL-fltered inverter plays a key role in energy conversion. However, it performs poor at rejecting grid background harmonics that distort the grid-side current and afect the quality of the output power of the inverter. Thus, a feedback strategy for the grid-side current employing the proportional integral and resonant controller (PI+HC) is used to mitigate the harmonics of the grid-side current and improves the quality of the output power of the grid-connected LCL-fltered inverter. Owing to the grid-side current feedback control system is unstable, improved High Pass Filter (HPF) active damping based on unit delay feedback is used to guarantee stability and efectiveness of PI+HC. The proposed method for mitigating grid-side current harmonics is validated by a detailed simulation and the results of experiments.
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Contribution of Electrical–Thermal Aging to Slot Partial Discharge Properties of HV Motor Windings
Ailiang Kang,Muqin Tian,Jiancheng Song,Lingyan Lin,Wei Li,Zhipeng Lei 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.3
During the operation of HV motor, the abrasion of stator windings because of vibration caused by electromagnetic force will lead to slot partial discharge (PD). Furthermore, the superheat induced by overcurrent or poor heat dissipation will aggravate the slot PD. To understand the developing process of slot PD and comprehend the infl uences of aging factors on slot PD properties, two discharge bar models were made under electrical–thermal aging. At triple the rated line-to-earth voltage of 6 kV, two stator bars were aged for 37 days under diff erent temperatures. The slot PD was measured during diff erent aging stages, and visual observations of the insulation and stator core surface were made at the beginning and the end of aging. The experiment results indicate that electrical–thermal aging has a signifi cant impact on the slot PD activities. The slot PD was intense under higher thermal stress, and the surfaces of insulation and stator core were oxidized after the long-time aging. This study can provide a judging basis for fault diagnosis of HV motors.
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