Intensive direct current deicing device topology structure for wind power plant

Abstract

The invention discloses an intensive direct current deicing device topology structure for a wind power plant. The structure comprises a three-winding deicing transformer, a serial-parallel knife switch and two groups of dynamic reactive compensation units. Three windings of the three-winding deicing transformer comprises a primary side winding and two secondary side windings. Each dynamic reactive compensation unit comprises two SVGs which are arranged in parallel. The primary side winding of the deicing transformer is connected with a power grid. The two secondary side windings are connected with the SVGs of the different dynamic reactive compensation units. The output end of each SVG is connected with an input end of the serial-parallel knife switch. The output end of the serial-parallel knife switch is connected to to-be-deiced lines. According to the structure, multifunctional output can be realized through utilization of the standard static var generator SVGs of a wind power plant can be realized; usually, the structure is used for carrying out the voltage reactive compensation of the power grid of the wind power plant; in winter, when the lines of the wind power plant is iced, the structure is used for deicing the lines; the structure has wide range current adjustment capability; deicing demands of different lines with relatively high linear difference are satisfied; deicing capacity demands of the lines of the wind power plant can be satisfied; an occupied area is small; and the construction cost is relatively low.

Description

technical field [0001] The invention relates to electrical engineering technology, in particular to a topological structure of an intensive DC ice-melting device for a wind farm. Background technique [0002] In recent years, under the dual pressure of rapid increase in energy consumption, rising prices and deterioration of the global ecological environment, countries all over the world have placed an important position on the development and utilization of renewable new energy. Among many renewable energy sources, wind energy is favored by people for its great advantages and development potential. Wind power generation is also developing rapidly and has become an industry with strong vitality. my country is very rich in wind energy resources. Using the wind speed at a height of 10 meters to calculate, the theoretical reserves of land wind energy resources are 3.226 billion kilowatts, and the actual exploitable resources are 253 million kilowatts. The construction of wind fa...

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Problems solved by technology

[0003] In order to improve the ability of transmission lines to resist ice disasters, many domestic units have developed various types of DC ice-melting devices, which provide a solid technical guarantee for the safe and stable operation of the power grid in winter. However, the existing ice-melting devices are mainly for the main grid or agricultural Grid transmission lines are not suitable for wind farm transmission lines to melt ice. The existing ice melting devices mainly have the following problems: Problem 1. The line shape of the ice melting line is relatively uniform or close, while the line shape of the wind farm power collection line and the sending line The difference is large, which puts forward higher requirements for the large-scale current regulation ability of the ice melting device; problem 2, the capacity of the ice melting device of the main grid is too large, while the capacity of the ice melting device of the rural grid is too small, which cannot meet the ice melting of the transmission line of the wind farm demand; problem 3, the construction area of ​​existing ice-melting devices is relatively large, and wind farms generally occupy a small area, which is difficult to meet the land demand for the construction of existing ice-melting devices; problem 4, the construction cost of existing ice-melting devices is relatively high , it is difficult to popularize and apply in wind farms as power generation enterprises

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