A black start frequency control method for wind farms based on virtual inertia

A virtual inertia and control method technology, which is applied in the field of black start frequency control of wind farms based on virtual inertia, can solve the problems of high gas turbine operation and maintenance requirements, unreasonable distribution, and insufficient black start power supply of the power grid, so as to improve frequency control ability, Enhance frequency stability and reduce frequency deviation

Active Publication Date: 2018-04-24
SOUTHEAST UNIV
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Problems solved by technology

The traditional black-start power supply usually chooses power sources with high operational reliability such as pumped storage power plants or gas turbines. However, due to factors such as the distribution of water resources and high requirements for gas turbine operation and maintenance, there are practical problems in the power grid that the black-start power supply is insufficient and unreasonable.

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  • A black start frequency control method for wind farms based on virtual inertia
  • A black start frequency control method for wind farms based on virtual inertia
  • A black start frequency control method for wind farms based on virtual inertia

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Embodiment Construction

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. However, the present invention is not limited to the examples given, and can provide technical reference for a frequency control method using an intermittent new energy power plant as a black start power supply.

[0033] Such as figure 1 As shown, a method for controlling the black start frequency of a wind farm based on virtual inertia in an embodiment of the present invention includes the following steps:

[0034] Step 10) When the system fails and the power is cut off, the wind farm is used as the black start power supply.

[0035] Step 20) Use the diesel generator to supply power to the 35kV side busbar of the wind farm, and start the static var generator at the same time to provide reactive power support for the black start system; The starting system provides a stable voltage amplitude and frequency reference.

[0...

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Abstract

The invention discloses a wind farm blackstart frequency control method based on virtual inertia, comprising the steps: 10), using a wind farm as a blackstart power source when a system is powered off; 20), powering a wind farm side bus through a diesel generator; 30), powering an auxiliary unit system of a permanent magnet direct-driven wind turbine unit; 40), in a start phase, introducing a system frequency deviation at a turbine side converter control process by using tracking curve switching virtual inertia control method; 50), switching the current main frequency control method to the additional power outer ring virtual inertia control method to respond to the frequency by using a coefficient conversion-based method for main frequency control method smooth switching; 60), starting an opposite thermal power plant auxiliary unit; 70), stating a high-capacity thermal power generating unit to restore a grid to the outside. This method enables frequency stability of an isolated system in the blackstart process of a wind farm to be improved.

Description

technical field [0001] The invention relates to a frequency control method, in particular to a black start frequency control method of a wind farm based on virtual inertia. Background technique [0002] Black start refers to the process of gradually expanding the power supply range of the system by driving the units without self-starting capability without relying on the help of other systems after the entire power system stops due to a fault, and finally realizing the recovery of the entire system. The traditional black-start power supply usually chooses power sources with high operational reliability such as pumped storage power plants or gas turbines. However, due to factors such as the distribution of water resources and high requirements for gas turbine operation and maintenance, there are practical problems in the power grid that the black-start power supply is insufficient and unreasonable. . With the improvement of operation control technology in the smart grid envi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386Y02E10/76
Inventor 汤奕刘煜谦冯祎鑫
Owner SOUTHEAST UNIV
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