Source-network coordination control method for wind farm flexible DC grid connection and DC output

A flexible direct current, coordinated control technology, applied in the direction of power transmission AC network, wind power generation, circuit devices, etc., can solve the problem of less research on wind farms, increase the power-frequency static characteristic coefficient and inertial response coefficient, reduce DC voltage fluctuation amplitude, effect of increasing inertia

Active Publication Date: 2019-03-08
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +1
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Problems solved by technology

[0006] At present, there are relatively few studies on the development and transmission of wind farms in the western plateau area. Therefore, it is of great significance to propose a method that can improve the inertia and frequency stability of the weak power grid at the sending end.

Method used

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  • Source-network coordination control method for wind farm flexible DC grid connection and DC output
  • Source-network coordination control method for wind farm flexible DC grid connection and DC output
  • Source-network coordination control method for wind farm flexible DC grid connection and DC output

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Embodiment Construction

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] The simulation model uses the figure 1 The topological diagram of grid connection and external transmission of wind farms in the western plateau area that can be intensively developed and exported is shown. VSC-HVDC is adopted to be connected to the grid and transmitted via LCC-HVDC. The characteristics of this topology are as follows:

[0053] 1) Due to the continuous increase of wind turbine installed capacity and DC output power, the power grid presents low inertia characteristics, and the peak-shaving capability of the power grid is insufficient, so the sending-end power grid is considered to be a weak sending-end system;

[0054] 2) The main function of LCC-HVDC is to send high-power wind power and conventional energy across regional distances;

[0055] 3) The main function of VSC-HVDC is to connect wind farms to the grid...

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Abstract

The invention discloses a wind farm direct current grid connection and direct current transmission source net coordination control method. The wind farm direct current grid connection and direct current transmission source net coordination control method comprises steps that LCC-HVDC additional control is additionally provided, and power-frequency slope characteristics provided with dead zones and inertia control are introduced in LCC-HVDC rectifier station fixed power control, and then transmitted power is capable of responding to frequency of a sending-end power grid; VSC-HVDC additional control is additionally provided; draught fan additional control is additionally provided, and active-frequency slope characteristic and the inertial control are introduced in draught fans, and then active power output by the draught fans is capable of responding to changes of WFVSC side frequencies; coordination of controllers is additionally provided, proper motion dead zones are arranged, and then the various controllers are coordinated. By increasing the power-frequency statistic characteristic coefficient and the inertia response coefficient of the system of the sending-end power grid, the inertia of the sending-end power grid is increased, and the frequency stability of the system is improved.

Description

technical field [0001] The invention relates to the fields of high-voltage direct current transmission and power system stability and control, in particular to a source-network coordination control method for flexible direct current grid-connected and direct current external transmission of wind farms. Background technique [0002] my country's terrestrial wind energy resource-rich areas are mainly distributed in three areas: the first is the Three North region, the second is the coastal wind energy resource-rich area within 2-3km from the coastline, and the third is the hinterland of the Qinghai-Tibet Plateau. Except for wind farms in coastal areas, most of the wind farms and load centers show a clear reverse distribution, and AC and DC interconnection grids are needed to meet the long-distance transmission and off-site consumption of wind energy. [0003] DC transmission has advantages over AC transmission technology. At present, there are two main types of DC transmissio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/36H02J3/18
CPCH02J3/18H02J3/36H02J3/386H02J2003/365Y02E10/76Y02E40/30Y02E60/60
Inventor 刘天琪曾雪洋李宏强顾雨嘉王顺亮江琴张爽张军
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY
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