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Li S.,Hunan University of Technology | Zeng H.,Hunan University of Technology | Li W.,Hunan University of Technology | Xu W.,Hunan University of Technology | Lin H.,Zhuzhou Electrical Power Bureau
Proceedings of 2013 IEEE 11th International Conference on Electronic Measurement and Instruments, ICEMI 2013 | Year: 2013

Due to the type of power in the microgrid are numerous, intermittent and randomness, and is accompanied by a large number of inverters, so the power quality problems such as harmonics are produced. For this reson, this paper presents a new power quality detection method, this method used the Chain Mixed Morphological Filter (CMMF) instead of the Low-Pass Filter (LPF) in the conventional ip - iq detection method based on the instantaneous reactive power theory, it maked many Mixed Morphological Filters gettd serially concatenated, and rational choosed the shape and length of the structural elements of each Mixed Morphological Filter, to achieve the best detection. Simulation results show that, this method can be fast and accurate detection of harmonic signals. © 2013 IEEE.

Chen N.,Wuhan University | Wen X.-S.,Wuhan University | Lan L.,Wuhan University | Luo J.,Zhuzhou Electrical Power Bureau | Li Y.,Ningxia Electrical Power Research Institute
Gaodianya Jishu/High Voltage Engineering | Year: 2011

In order to investigate the power frequency electromagnetic field distribution of transmission line crossed in space, a three-dimensional electromagnetic field calculation model of three-phase cross-wire was established according to the catenary equation and considering conductor sag and tower. Based on the charge simulation method, the power frequency electrical field below the cross-wire was calculated, utilizing linear finite slant line charges to simulate the axial charge distribution in wire. Based on the Biot-Savart theorem, the power frequency magnetic field below the cross-wire was calculated by finite thin current-carrying wire model. Meanwhile, the influence law of crossing angle and line-phase on field distribution was discussed. The calculation results show that the electromagnetic field below the cross-wire decreases with the crossing angle getting larger, and the field distribution changes with line-phase altered; the maximum electrical field occurs near the projection of the same phase cross-wire intersection, and the maximum magnetic field occurs near the projection of the intersection of middle phase of the top wire and side phase of the lower wire. Besides, the wire at the bottom plays a shield wire role in electrical field, however, for magnetic field, the role is related with crossing angle. In the end, the electromagnetic field is surveyed on the spots for two typical crossed wires in YinChuan area, and the availability of the algorithm is validated.

Quan Z.-C.,Zhuzhou Electrical Power Bureau | Chen J.,Zhuzhou Electrical Power Bureau | Wang K.,Zhuzhou Electrical Power Bureau | Ouyang G.,Zhuzhou Electrical Power Bureau | And 3 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2011

This paper introduces a theoretical analysis and practical solution about a GIS substation with 110 kV XLPE cable, in which an electromagnetic voltage transformer (EVT) is installed. Due to the non-disassembly EVT, a practical voltage withstand test method, series-parallel resonant with increasing frequency, is suggested. The results show that it is an effective solution.

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