The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
DC flow on the power transformer windings can lead to severe half-cycle saturation issues and impose great threats on AC power systems. A transformer neutral direct current balancing device is proposed in this paper to address this issue. By injecting direct current into a grounding grid, the DC flow of power transformer windings can be compensated via proper control strategy and thus the biased working...
In this paper, a circulating current suppressing control is proposed to suppress the circulating current in the modular multilevel converter based unified power quality conditioner (MMC-UPQC). In order to decrease the circulating current among the six phases of MMC-UPQC, which is resulted from the voltage difference of the six phases, an averaged phase voltage control is introduced in the UPQC control...
This paper selects one 500 kV mono-phase type transformer as the test object. Its no-load current includes dc component and even harmonics obviously in dc magnetic bias. With the increasing of the neutral dc current, the lower the harmonic order is, the more rapidly the harmonic current increases and the larger its percent on the basic-frequency component is. The dc component keeps 70% of the neutral...
HVDC power systems operating in ground-return mode produce DC voltages around the electrodes. During monopolar operations of the HVDC electrode, DC biases of the transformers caused by the DC current through neutral points may damage the transformers and the whole network. The noises and the neutral point DC currents of the main transformers with earthed neutral points in Yihe substation and LN power...
HVDC power systems operating in ground-return mode produce DC voltages around the electrodes. During monopolar operations of the HVDC electrode, DC biases of the transformers caused by the DC current through neutral points may damage the transformers and the whole network. In an attempt to prevent or minimize these harmful effects, more efforts were put on the research activities on how to restrain...
HVDC power systems operating in ground-return mode produce DC voltages around the electrodes. During Monopolar operations of the HVDC electrode, DC biases of the transformers caused by the DC current through neutral points may damage the transformers and the whole network. The noises and the neutral point DC currents of the main transformers with earthed neutral points in Yihe substation and LN power...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.