Multi-winding magnetic integrated type hybrid power distribution transformer

Abstract

The present invention discloses a multi-winding magnetic integrated type hybrid power distribution transformer, which comprises an auxiliary iron core, a current transformer set and a three-phase winding. The iron core comprises an iron yoke, an upper iron core column and a lower iron core column, wherein the iron yoke, the upper iron core column and the lower iron core column are connected to form the iron core. Each current transformer set is composed of a current-controlled converter and a voltage-controlled converter. The three-phase winding is composed of a main transformer winding, a series transformer winding and a filtering inductor. Each phase of the main transformer winding comprises a primary winding, a secondary winding and a plurality of control windings. Each phase of the series transformer winding comprises a grid-side winding and a plurality of converter-side windings. Each current-controlled converter is accessed to the corresponding control winding. Based on the magnetic potential balance principle, the grid current is controlled. Each voltage-controlled converter is accessed to the corresponding converter-side winding so as to control the load voltage. Based on the magnetic integration technique, the integrated design of all discrete magnetic parts of a multi-winding transformer is realized, so that the utilization rate of the ferromagnetic material and the controlling capacity of equipment can be improved. A plurality of current transformer groups are matched up in the coordinative manner and are standby for one another. Therefore, the reliability of the equipment is effectively improved.

Description

technical field [0001] The invention relates to a multi-winding magnetically integrated hybrid distribution transformer, which belongs to the technical field of transformers. Background technique [0002] The future development trend of the smart grid puts forward new requirements for the performance of ordinary distribution transformers. In addition to basic functions such as voltage level conversion and power transmission, distribution transformers should also have stable power supply voltage, power flow control, and harmonic control. Current suppression, power factor correction, reactive power compensation, asymmetry control, status monitoring, short circuit protection, AC-DC power supply and other functions. [0003] In this engineering background, the power electronic transformer (PET) has become a current research hotspot due to its strong controllability, but the PET scheme is based on full power conversion and uses multi-level converter units, resulting in low overal...

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Problems solved by technology

[0004] However, there are few reports on hybrid distribution transformers at present, and the research work of domestic and foreign scholars is still in its infancy. Need to develop in the direction of large capacity controllable, high reliability, small integration, etc.

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