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Control method of direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device

A technology of subsynchronous oscillation and suppression device, applied in circuit devices, wind power generation, reducing/preventing power oscillation, etc., can solve the problem that cannot be applied to static var compensator, etc., and achieve the effect of strong practicability and simple control method

Active Publication Date: 2019-12-10
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional virtual synchronous machine control is mainly based on the output of active power, which cannot be directly applied to the static var compensator whose main purpose is to transmit reactive power. The original controller and control parameter design methods need to be improved

Method used

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  • Control method of direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device
  • Control method of direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device
  • Control method of direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Simplified circuit of direct-drive wind farm grid-connected system figure 1 shown. Grid-connected inverter via L 1 Grid-connected after filtering, inductance L g and resistor R g form the grid impedance.

[0029] The positive and negative sequence impedance expression of the direct drive fan is:

[0030]

[0031] Among them, K m is the modulation signal gain, K d and K f are the decoupling coefficient and the current feed-forward system, G i =k ip +k ii / s is the current inner loop transfer function, V dc1 Inverter DC side voltage, V 1 is the grid connection point voltage v abc Amplitude of I 1 and are the amplitude and initial phase angle of the grid-connected current, T PLL (s) = V 1 h PLL (s) / [1+V 1 h PLL (s)], H PLL (s)=(k pllp +k plli / s) / s,T 1 and can be found from their vector expressions: h v and H i Represent the voltage and current sampling delays respectively, and the expressions are:

[0032]

[0033] Among them, T v and...

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Abstract

The invention discloses a direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device and a control method thereof. The invention mainly comprises a subsynchronous oscillation suppression device and an improved virtual synchronous machine control method thereof, which are used for suppressing subsynchronous oscillation of a direct-driven wind power plant under a condition of grid connection of an inductive weak power grid. The subsynchronous oscillation suppression device comprises a static synchronous reactive power compensator and a battery energy storage system. A storage battery is connected to a direct current side of a static synchronous reactive power compensator, and the control method is improved virtual synchronous machinecontrol. By using the direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation suppression device and the control method thereof, subsynchronous oscillationcaused by interaction between a direct-driven wind power plant and an inductive weak power grid can be well suppressed, and a solution is provided for treatment of direct-driven wind power plant inductive weak power grid grid-connected subsynchronous oscillation.

Description

technical field [0001] The invention relates to the field of suppressing subsynchronous oscillations of inductively weak grids connected to direct-drive wind farms, in particular to a control method for suppressing subsynchronous oscillations of inductively weak grids connected to direct-driven wind farms. Background technique [0002] With the development of the times, the proportion of renewable energy power generation is getting higher and higher, among which wind power generation has been applied on a large scale. Direct-drive wind turbines also have high efficiency at low wind speeds, and have many advantages such as low noise, long life, small unit size, and low operation and maintenance costs. Therefore, there are more and more direct-drive wind farms. Since most wind farms are far away from power loads, the grid-connection of direct-drive wind farms is mostly in the case of inductive weak grids. In 2015, a large-scale direct-drive wind farm in Hami, Xinjiang, experi...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/18H02J3/38
CPCH02J3/24H02J3/1842Y02E10/76Y02E40/10
Inventor 罗安李高翔陈燕东王海宁曹世骧姜捷
Owner HUNAN UNIV
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