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An Accurate common-mode current Prediction Method for Transformerless Photovoltaic Inverters Based on Graph Theory

Chinese Journal of Electrical Engineering 2017年第3期3卷 59-67页

作者： Yangbin Zeng Hong Li Bo Zhang Zhichang Yang Trillion Q.Zheng School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China School of Electric Power South China University of TechnologyGuangzhou 510641China

The common-mode current is an important indicator with transformerless photovoltaic ***,up to now,there is not an accurate method to predict common-mode current in the inverter design process,resulting from inappropriate device selection or exceeded the expected common-mode *** order to solve this problem,this paper proposes an accurate common-mode current prediction method based on graph theory for transformerless photovoltaic *** this paper,the mathematic model of the common-mode current is derived using graph theory analysis method in the full-bridge topology,and it is used to predict common-mode *** validity and correctness of the proposed prediction method are validated by simulation and *** oscillation frequency and amplitude can be predicted by the proposed common-mode prediction method,whereas the traditional common-mode analysis method *** paper provides a novel way to predict and analyze common-mode current in the transformerless photovoltaic inverters.

关键词： common-mode current transformerless photovoltaic inverters prediction method electromagnetic interference

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Double-ring high-frequency common-mode switching oscillation current sensor for inverter-fed machine winding insulation monitoring

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Global Energy Interconnection 2024年第1期7卷 106-116页

作者： Lingqing Pan Xizhou Du Xing Lei Ting Ye Dawei Xiang Hao Li College of Electrical Power Engineering Shanghai University of Electric PowerShanghai 200090P.R.China State Grid Shanghai Municipal Electric Power Company Shanghai 200122P.R.China College of Electronics and Information Engineering Tongji UniversityShanghai 201804P.R.China

Insulation failure significantly contributes to the unpredictable shutdown of power *** to the partial discharge and high-frequency(HF)injection methods,the HF common-mode(CM)leakage current method offers a non-intrusive and highly sensitive ***,the detection of HF CM currents is susceptible to interference from differential-mode(DM)currents,which exhibit high-amplitude and multifrequency components during normal *** address this challenge,this paper proposes a double-ring current sensor based on the principle of magnetic shielding for inverter-fed machine winding insulation *** inner ring harnesses the magnetic aggregation effect to isolate the DM current magnetic field,whereas the outer ring serves as the magnetic core of the Rogowski current sensor,enabling HF CM current ***,the magnetic field distributions of the CM and DM currents were ***,a correlation between the sensor parameters and signal-to-noise ratio of the target HF CM current was ***,an experimental study was conducted on a 3-kW PMSM for *** results indicate that the proposed double-ring HF CM sensor can effectively mitigate DM current *** to a single-ring sensor,a reduction of approximately 40%in the DM component was achieved,which significantly enhanced the precision of online insulation monitoring.

关键词： Magnetic shielding Double-ring common-mode current Maxwell simulation

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