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Converter station and AC power grid optimal reactive power exchange capacity determination method

A technology of AC power grid and power exchange, applied in AC network circuit, power transmission AC network, AC network voltage adjustment, etc. Reduce the coupling calculation process and calculate the effect of fast and easy

Pending Publication Date: 2022-03-01
国网河南省电力公司直流中心 +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the dynamic reactive power control of the converter station only considers that the reactive power exchange with the system is zero, and does not consider the coordination relationship with the reactive power compensation resources of the AC grid near the converter station

Method used

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  • Converter station and AC power grid optimal reactive power exchange capacity determination method
  • Converter station and AC power grid optimal reactive power exchange capacity determination method
  • Converter station and AC power grid optimal reactive power exchange capacity determination method

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Embodiment example

[0075] The Tianshan-Zhongzhou ±800kV DC transmission project is the first UHV DC transmission project in which the country implements the strategy of "transmitting power from Xinjiang", and it is also the first UHV project in which electricity is bundled and sent from large-scale thermal power and wind power bases in Northwest China. The project starts from Hami Tianshan Converter Station in Xinjiang Uygur Autonomous Region in the west and ends in Zhengzhou Zhongzhou Converter Station in Henan Province in the east. The rated voltage is ±800kV, the rated DC current is 5kA, and the rated transmission power is 8000MW.

[0076] The UHV Zhongzhou Converter Station operates in bipolar, and each pole is composed of two sets of 12-pulse converters connected in series. The AC filter is divided into WA.Z1, WA.Z2, WA.Z3, WA.Z4, 4 groups and 19 groups, including 10 groups of AC filters and 9 groups of shunt capacitors. Each group provides 260Mvar reactive power, a total of 4940Mvar , larg...

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Abstract

The invention discloses a method for determining the optimal reactive power exchange capacity of a converter station and an alternating-current power grid, and belongs to the technical field of power transmission optimization. The invention provides a method for calculating the load flow of an AC / DC interconnected power system based on an alternating solution method, and provides a method for calculating the load flow of the AC / DC interconnected power system based on the load flow calculation of the AC / DC interconnected power system. And analyzing and determining the optimal alternating current filter input group number of the converter station and the optimal reactive power exchange capacity of the alternating current and direct current system under different control targets. The calculation result provided by the invention can be used as a proper method for researching the redundancy of the converter station under the alternating current capacity of the minimum filter and the absolute minimum filter bank under different transmission power levels, and meanwhile, the optimal reactive power exchange capacity between the converter station and the alternating current system under different transmission power levels is researched.

Description

technical field [0001] The invention belongs to the technical field of power transmission optimization, in particular to a method for determining the optimal reactive power exchange amount between a converter station and an AC power grid. Background technique [0002] In high-voltage direct current transmission, the converter that realizes AC-DC conversion becomes a nonlinear load of the AC system due to the continuous change of topology structure. Whether it is rectification or inverter operation, the converter consumes a large amount of reactive power. That is, for the AC system, the DC transmission system is a reactive load. Under the rated power, the reactive power consumed by the rectifier station usually accounts for 40% to 50% of the DC transmission power, and the reactive power consumed by the inverter station is huge, accounting for about 50% to 60%. In order to maintain the voltage safety of the AC and DC systems, it is necessary to adopt a reasonable reactive pow...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/36H02J3/16H02J2203/10H02J2203/20Y02E40/30Y02E60/60
Inventor 吴宁廖卉莲李帅兵孟异山陈炳华彭华坤王翔张建飞路豪代炆钰张旭尚静文刘辛裔王笑倩杨凯楠张笑寒
Owner 国网河南省电力公司直流中心