Loop line operation method based on power distribution network of power electronic transformer

Abstract

The invention discloses a loop line operation method based on a power distribution network of a power electronic transformer. The loop line operation method is composed of a phase detection module, a phase difference calculation module, a power point setting module, a power synchronization module, a voltage control module and a pulse width modulation module. The operation scheme disclosed by the invention is simple in control structure and convenient in parameter adjustment, and the operation scheme disclosed by the invention can normally and reliably work in a radiation type power grid and a loop line operation power grid by utilizing the power point setting module and the power synchronization module. Moreover, through the pre-synchronization adjustment process disclosed by the scheme, the disturbance of the voltage and the phase when the radiation type power grid is switched to the loop line operation can be effectively reduced. In addition, the power point setting module and the power synchronization module can be used for adjusting the power of the loop line operation power grid, and the excellent performance after the operation mode of the power grid is converted is ensured.

Description

technical field [0001] The invention relates to the field of electric power system application technology, in particular to a loop line operation method based on a power electronic transformer distribution network. Background technique [0002] In order to face and solve the challenges of the vigorous development of new energy and the large-scale application of electric vehicles to the safe and reliable operation of the power grid, the distribution network technology based on power electronic transformers has attracted widespread attention as an effective method to meet the challenges. Power electronic transformers, also known as smart transformers, compared with traditional transformers, can achieve continuous control of output voltage and frequency on the basis of realizing voltage transformation and isolation functions. The distribution network based on power electronic transformer has the advantages of high power quality, low power loss, good voltage regulation performan...

AI Technical Summary

Problems solved by technology

Since the voltage amplitude and phase difference of different feeder lines cannot be ignored, if synchronous control is not adopted or the control strategy is unreasonable, a large voltage amplitude difference or phase difference will cause the power flow to be uncontrollable, causing inrush current and voltage jump, A serious threat to the safe and reliable operation of the distribution network

The loop operation mode of the traditional distribution network is difficult to apply to this new type of power grid

At present, some literatures have carried out research on flexible loop closure, but usually rely on additional power electronic equipment, and the control structure of the synchronization scheme is complex

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