Low-voltage power distribution network tail end low-voltage treatment parallel compensation device

Abstract

The invention discloses a low-voltage power distribution network tail end low-voltage treatment parallel compensation device. The device comprises a rectifying device and an inversion device, the input side of the rectifying device is connected with the output side of a power distribution network transformer, three-phase alternating current is rectified into direct current, and the output side of the rectifying device is connected with the input side of the inversion device through an independent direct current transmission cable; and the input side of the inversion device is connected with the output side of the rectifying device through an independent direct current transmission cable to invert direct current into alternating current, and the output side of the inversion device is connected with an original alternating current transmission cable in parallel. According to the invention, through the AC-DC-AC conversion technology, a parallel connection mode is adopted to compensate the user power demand before and after the original AC power transmission parallel connection point, the problem of low end voltage caused by line voltage drop in high-power long-distance AC power transmission is solved, and the end user voltage quality is improved.

Description

technical field [0001] The invention relates to the technical field of low-voltage power distribution, in particular to a parallel compensation device for low-voltage control at the end of a low-voltage power distribution network. Background technique [0002] With the rapid development of my country's economy and the continuous improvement of residents' living standards, the electricity consumption of residents has also increased. The requirements for the power quality of distribution networks have become one of the important assessment items for power supply companies. However, in some relatively remote mountainous areas or rural areas, the problem of terminal low voltage caused by long power supply radius, thin transmission cable diameter and fluctuations in residential electricity load is very prominent, and the terminal voltage cannot meet the supply voltage specified in the national standard The deviation is +7% and -10% of the nominal voltage. At the same time, the co...

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Problems solved by technology

This method has problems such as long construction period, large investment and high cost, and it is difficult to obtain a good return on investment. With the increase of high-power loads in residents' homes, it is likely that low-voltage problems will occur again due to the continuous increase in residential consumption.

[0005] 2) The series compensation scheme is adopted to rectify AC power into DC power through power electronic conversion technology, and the original AC transmission line is converted into a DC transmission line to reduce line loss. On the user side, the DC power is converted into AC power through power electronic conversion technology. This method can solve the problem of large voltage drop on long-distance AC transmission lines to a certain extent, but it is limited by the capacity of the equipment and cannot flexibly adapt to the increasing power demand of users, and because of the series connection method, it will affect the original line Carrier communication and meter reading functions

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