Current conversion device with function of multi-target load control

Abstract

The invention discloses a current conversion device with a function of multi-target load control. The current conversion device with the function of multi-target load control comprises two three-phase converters, wherein one three-phase converter is connected to an alternating-current circuit in series through a coupling transformer to serve as a voltage compensation unit, the other three-phase converter is connected to the alternating-current circuit through an inductor to serve as a current compensation unit, and the two three-phase converters are connected to a common direct-current bus through a direct-current capacitor. Due to the fact that the three-phase converters are connected with the side of a system and the side of a load in series / parallel to carry out voltage compensation and current compensation, the function of multi-target load control which can achieve harmonic cancellation, reactive compensation and voltage stabilization can be achieved, quality of electric energy can be effectively improved, and loss of a power grid can be reduced.

Description

technical field [0001] The invention relates to an AC power converter, in particular to a converter with multi-objective load control. Background technique [0002] Power electronics, together with operation control and computer technology, has become the two most important technologies in the 21st century. However, the harmonic pollution generated by power electronic devices has become a major obstacle to the development of power electronic technology. For this reason, foreign experts have proposed a new concept of "customer power technology". Its purpose is to transform the distribution system into a flexible distribution network with no voltage fluctuation, no asymmetry and no harmonic real-time control. How to effectively implement harmonic control, reactive power compensation and voltage stability and apply them safely and reliably to the power grid, the causes, laws, characteristics and control methods of various power quality problems have become hot topics in curre...

AI Technical Summary

Problems solved by technology

However, since the dynamic voltage regulator only provides the power consumption required by the load to meet the normal voltage when the voltage drops, although it can solve the problem of voltage sag, its efficiency is relatively high, but its cost is relatively high, and its structure is relatively complicated, so it is difficult to promote it. difficulty

[0007] It can be seen from the above that the existing equipment (APF, DVR, SVG) can only be optimized for a certain technical index of power quality, and cannot achieve multi-objective control. The promotion is limited due to the high level, and it will also affect the normal operation of a single device due to the mutual influence between devices

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