Setting method of DC de-icing major loop

Abstract

The invention relates to a setting method of a DC de-icing major loop, which comprises a three-phase three-winding rectiformer, a 12-pulsating rectifier device, a control protecting device, an automatic switching device and a DC side disconnecting link, wherein the link group of the three-phase three-winding rectiformer adopts D / d 0 / y11 or Y / y 0 / d11 link, two low-voltage side windings of the three-phase three-winding rectiformer misalign 30 degrees, two groups of low-voltage side three-phase outputs of the three-phase three-winding rectiformer are respectively connected to three-phase inputs of two valve groups of the 12-pulsating rectifier device, i.e. a converter; the anode output and the cathode output of the 12-pulsating rectifier device are respectively connected to a three-phase AC line needing to be de-iced through DC side switches when in a DC de-icing mode so as to form the DC de-icing major loop for performing the DC de-icing of the three-phase AC line. The invention has thefunctions of balancing the de-icing and operating at large-current for a long time, and can safely, conveniently and quickly de-ice; and DC de-icing once-expansion equipment can integrate the function of reactive power compensation.

Description

technical field [0001] The invention relates to a method for setting up a main circuit for DC ice melting, in particular to setting up a main circuit for ice melting and reactive power compensation suitable for transmission lines of high-voltage and extra-high voltage power grids. Background technique [0002] Icing of transmission lines in winter seriously threatens the safe operation of the power system. Due to the increased ice load on the conductors, it will cause certain mechanical damage to the conductors, iron towers and fittings. When the ice is severe, the wires will be broken and the towers will fall, resulting in large-scale power outages and great losses to the national economy. [0003] Several ideas for research on ice melting at home and abroad are as follows: convert electrical energy into heat energy to melt ice; deicing. [0004] Since the 1970s, my country has been using the AC short-circuit method to melt ice on lines below 220kV, which has played a goo...

AI Technical Summary

Problems solved by technology

In the AREVA company's scheme and the China Electric Power Research Institute's patent application 200810223583.9, the main wiring reconfiguration method is used to realize the ice melting and SVC functions, and the equipment and wiring are complicated; neither of these schemes has simple wiring and has little impact on the harmonics of the system. Advantages of configuring filter banks, etc.

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