Method for controlling cascaded multi-cell high-power high-frequency ice melting power supply

Abstract

The invention discloses a method for controlling a cascaded multi-cell high-power high-frequency ice melting power supply, which includes the following steps: S1, an input side implements input-side power factor rectification through instantaneous direct current control to suppress the input-side harmonic, wherein the direct current control is composed of current inner loop control and voltage outer loop control; S2, SPWM inversion control is carried out on a combined inverter, and multiple combined phase shifting H-bridge inverter structure control is adopted; and S3, the combined inverter adopts input voltage sharing and output current sharing control. The technical problems in the prior art are solved, for example: there is high harmonic in the ice melting excitation input power supply,and the input current is of low quality; and the output harmonic at the output side is high, and loop current is generated, which reduces the safety of the ice melting power supply.

Description

technical field [0001] The invention belongs to the ice-melting technology of power transmission lines, and in particular relates to a unit cascade type high-power high-frequency ice-melting power supply control method. Background technique [0002] In the freezing rainy and snowy weather in winter, the ice coating of the line is likely to cause serious faults such as conductor galloping, tripping and power failure, down pole (tower), conductor breakage, etc. At present, the commonly used deicing methods include AC short-circuit deicing method and direct current deicing method. However, AC short-circuit ice melting and DC ice melting require switching operations on the power grid, and the ice melting line needs to be shut down for ice melting. For ultra-high voltage and ultra-high voltage transmission lines, the outage will cause huge loss of power transmission capacity, and due to grid Temporary structural changes cause increased risk to the grid. Therefore, it is very im...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a unit cascade type high-power high-frequency ice-melting power supply control method to solve the problem of large harmonics of the input power supply and low quality of the input current in the prior art ice-melting excitation; large output harmonics at the output side, And the circulation is generated, which reduces the technical problems such as the safety of the ice-melting power supply

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