Closed-loop power distribution network system based on flexible direct current

Abstract

The invention provides a closed-loop power distribution network system based on a flexible direct current. The system comprises N direct current buses and N direct current transmission lines, and each direct current bus is connected with the direct current transmission lines at intervals to form a closed-loop power distribution network; each direct current bus is connected with at least one alternating current system rectifier station so as to rectify electric energy of the alternating current system to direct current electric energy, and the direct current electric energy is gathered into a closed-loop power distribution network system of the flexible direct current; at least one alternating current system rectifier station is used as a regulator station to control and regulate direct current voltage; each direct current bus is connected with M user inverter stations which can invert the direct current electric energy to the alternating current electric energy to provide for users; and each direct current transmission line is provided with K direct current switches, and when the direct current transformation lines break down, the switches are used for tripping to isolate fault points. According to the closed-loop power distribution network system based on the flexible direct current, the support can be provided for voltage stability, the voltage quality is improved, and a good environment can be created for the medium voltage distribution network system improvement.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a closed-loop distribution network system based on flexible direct current. Background technique [0002] With the development of power electronic devices and control technology, a new type of semiconductor device—Insulated Gate Bipolar Transistor (IGBT) has been applied in low-voltage systems, making IGBT a voltage source converter for switching devices ( Voltage-Sourced Converter, VSC), and then widely used in industrial drive devices, and after several upgrades of the voltage and capacity of subsequent IGBT devices, the voltage source converter composed of insulated gate bipolar transistors is used in DC transmission. The application in the distribution network becomes a reality. [0003] In the application of DC transmission and distribution network, the converter adopts IGBT valve and two-level (or multi-level) three-phase mechanism, and uses pulse width modulation ...

AI Technical Summary

Problems solved by technology

[0010] In order to solve various technical problems such as weak distribution network, poor voltage quality, low power supply reliability, and tight transmission channel corridors existing in the flexible DC distribution network system currently in operation, the present invention proposes a closed-loop system based on flexible DC Distribution Network System

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