A transformer magnetic compensation device and method adapted to rectification load

Abstract

The invention discloses a transformer magnetic compensation device and method adapted to rectification loads. The transformer magnetic compensation device includes a transformer with a compensation winding, and a power electronic compensation circuit connected to the compensation winding and its control system; the primary side winding of the transformer Connected to the power grid, the secondary winding of the transformer supplies power to the rectified load. The invention utilizes the transformer compensation winding to adjust the magnetic flux of the transformer core, and performs magnetic compensation on the secondary side, avoids and reduces the harmonics caused by the rectification load from entering the primary side of the transformer, and simultaneously compensates the reactive power loss caused by the secondary winding of the transformer and the leakage reactance of the transformer , to achieve harmonic control and reactive power compensation for rectified loads.

Description

technical field [0001] The invention relates to the field of power quality control of rectified loads, in particular to a transformer magnetic compensation device and method adapted to rectified loads. Background technique [0002] The industrial application of the rectifier load is extensive, such as rail transit field, electrolysis device, etc. The rectified load will cause harmonic and power factor problems in the distribution network, and even affect the accuracy of information and data transmission and the safety of industrial production. Harmonic control and reactive power compensation must be carried out. [0003] There are two commonly used methods, one is passive compensation, such as static var compensation device (SVC), passive filter, etc.; the other is active compensation, such as static var generator (SVG), active filter ( APF) etc. The passive filter is a filter circuit composed of a combination of inductors, capacitors and resistors, which can filter out on...

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Problems solved by technology

The voltage on the primary side belongs to the medium-voltage category above 10kV. Due to the limited withstand voltage level of commonly used IGBT devices, in order to connect in parallel to voltage levels such as 10kV and 35kV, it is necessary to apply complex cascaded topologies or custom transformers, resulting in increased investment costs. Or use a step-down transformer to reduce the primary side voltage level of the distribution transformer to a low-voltage level suitable for the connection of the compensation device, then the transformer increases the system loss, and the economical efficiency of the solution is limited

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