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

A technology of power control and high power, which is applied to the installation of output power conversion devices, electrical components, and cables, etc. It can solve the problem of large harmonics in the input power supply for ice-melting excitation, reduced safety of ice-melting power supply, and low quality of input current, etc. problem, to achieve the effect of improving safety, solving large harmonics, and suppressing input side harmonics

Inactive Publication Date: 2018-04-20
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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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 an...

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

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Embodiment Construction

[0031] The invention provides a control method to realize parallel connection of power units to output high-frequency and large current, and provides a new ice-melting method for ice-covered lines of power grids in winter.

[0032] The rectification and inversion of the high-frequency ice-melting power supply of the present invention adopt full-control devices, and the control of the power unit includes two parts: the rectification bridge and the inverter H-bridge control.

[0033] (1) Instantaneous direct current control is used on the input side to realize unit power factor rectification on the input side. The direct current control is composed of a double closed-loop control of the current inner loop and the voltage outer loop, which can effectively suppress the input side harmonics and improve the ice-melting excitation. The quality of the source input current;

[0034] (2) The inverter unit adopts SPWM multiplexing, input voltage equalization, and output current equalizat...

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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...

Claims

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Application Information

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IPC IPC(8): H02M1/12H02G7/16
CPCH02G7/16H02M1/12
Inventor 马晓红代洲毛先胤曾华荣许逵张迅刘宇田承越牛唯周羽生王贤军边瑞恩甘凌霄
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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