Intermediate frequency AC bus convergence-based wind power plant DC transmission grid access method
A technology for DC power transmission and access to the power grid, which is applied in power transmission AC network, single-network parallel feeding arrangement, etc., can solve the problems of large size, difficult construction, and large land occupation of modular multi-level converters. Achieve the effect of small volume and weight, high degree of compactness and low cost
Active Publication Date: 2019-05-21
TSINGHUA UNIV
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Problems solved by technology
[0005] The purpose of the present invention is to propose a method for connecting wind power DC transmission to the power grid based on the collection of intermediate frequency AC busbars, aiming at the large volume and land occupation of the existing power frequency converter transformer and modular multilevel converter of the wind power DC transmission system Large size, high cost, and difficult construction. The frequency of the output AC voltage of each wind turbine is increased from power frequency to intermediate frequency, and the wind farm is changed from power frequency AC integration to intermediate frequency AC integration and then sent to the flexible DC transmission converter station.
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[0019] The method for connecting DC transmission of wind farms to the power grid based on the convergence of intermediate frequency AC buses proposed by the present invention includes the following steps:
[0020] (1) Create a figure 1 The shown wind farm DC transmission access grid system based on the intermediate frequency AC bus collection includes N wind turbines 101, N intermediate frequency AC transmission lines 102, intermediate frequency AC collection bus 103, converter station intermediate frequency step-up transformer 104, and intermediate frequency modular Multi-level converter 105, DC transmission line 106, power frequency high voltage converter 107 and power frequency AC power grid 108; the three-phase intermediate frequency AC voltage output terminals of the N wind turbines 101 are respectively connected to N intermediate frequency AC transmission lines 102 is connected to the input end; the output ends of the N intermediate frequency AC transmission lines 102 are co...
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The invention relates to an intermediate frequency AC bus convergence-based wind power plant DC transmission grid access method, and belongs to the technical field of wind power transmission and gridconnection. According to the method, three-phase intermediate-frequency medium-voltage AC power of a plurality of wind generator sets is transmitted to an intermediate-frequency AC convergence bus through a plurality of intermediate-frequency AC power transmission lines, is transmitted to an intermediate-frequency boosting transformer of a converter station to be converted into three-phase intermediate-frequency high-voltage AC power, is converted into high-voltage DC power through an intermediate-frequency modularized multi-level current converter, is transmitted to a power-frequency high-voltage current converter through a DC power transmission line to be converted to three-phase power-frequency high-voltage AC power, and is connected into a power-frequency AC grid. According to the method, a wind power plant is changed from power-frequency AC convergence to intermediate-frequency AC convergence, so that the intermediate-frequency transformer can have smaller volume and weight. The cost, volume and weight of the intermediate-frequency modularized multi-level current converter is greatly reduced, and the wind power plant DC power transmission systems are lower in cost and high incompact degree.
Description
Technical field [0001] The invention relates to a method for connecting DC transmission of a wind farm based on an intermediate frequency AC bus to a power grid, and belongs to the technical field of wind power transmission and grid connection. Background technique [0002] With the development and application of wind power technology, onshore wind power has been developed and utilized on a large scale. Offshore wind also has huge development potential and will be a trend in the development of wind power in the future. The power transmission of large-scale wind farms has always been a bottleneck in the development of wind power. Since wind power generation generally has unstable power supply quality and is far away from the AC main grid, the direct connection to the AC grid may have many negative effects on the main grid. In recent years, the research and application of flexible DC transmission technology based on voltage source converters has been developed very fast, and it h...
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IPC IPC(8): H02J3/38H02J3/36
CPCY02E60/60
Inventor 宋强李政轩曾嵘赵彪
Owner TSINGHUA UNIV