Iron core reactor having dual zero crossing control function

Abstract

The invention discloses an iron core reactor having dual zero crossing control function, and relates to the technical field of power transmission. The iron core reactor includes turn adjusting coils and a common line. The turn adjusting coils are divided to coarse adjusting coils and fine adjusting coils. The coarse adjusting coils have a plurality of coarse adjusting groups. Each coarse adjusting group is provided with a coarse adjusting tap. The fine adjusting coils have a plurality of fine adjusting groups. Each fine adjusting group is provided with a fine adjusting tap thereon. The coarse adjusting taps and the fine adjusting taps are both connected to the public line. Each coarse adjusting group and each fine adjusting group is provided with a thyristor thereon. Compared with prior art, according to the invention, the iron core reactor has the following beneficial advantages: the iron core reactor can perform reactive compensation in a full dynamic manner, can replace a SVG apparatus; and compared with the SVG apparatus, the iron core reactor has less energy consumption, low cost, and has higher adjusting precision than the SVG apparatus.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, in particular to a reactor. Background technique [0002] The reactive power compensation device is in an indispensable and very important position in the power supply system. In the power supply system, it can improve the power factor of the power grid, reduce the loss of power supply transformers and transmission lines, improve power supply efficiency, and improve the power supply environment. effect. The compensation methods currently used are mainly divided into two types: capacitive ordinary passive compensation equipment (such as FC and SVC) and full-dynamic static var generator (SVG). [0003] The capacitive compensation method can no longer adapt to today's complex power grid system. Ordinary passive compensation equipment is prone to overcompensation and undercompensation for rapidly changing impact loads, and the compensation effect cannot reach the ideal ...

AI Technical Summary

Problems solved by technology

[0003] Capacitive compensation methods can no longer adapt to today's complex power grid systems. Common passive compensation equipment is prone to overcompensation and undercompensation for rapidly changing impact loads, and the compensation effect cannot reach the ideal state.

And there are several disadvantages as follows: 1. The compensation capacity of the fixed capacitor bank cannot be adjusted

2. Capacitors cannot be switched continuously and frequently, because the capacitor needs to discharge time

3. The response speed of switching capacitors is slow, and dynamic reactive power cannot be compensated, that is, fast loads cannot be compensated

4. Each group of capacitors has a step difference, which cannot be compensated continuously, and the power factor will not be compensated very high

[0004] Although SVG can make up for many shortcomings of capacitive compensation, and can fully adapt to the compensation needs of current power consumption sites, the cost of using SVG is too high, and it is difficult to accept in general occasions. Even some power grids with SVG are often shut down due to cost factors.

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