Subsynchronous oscillation suppression method for doubly-fed unit grid-connected system, and related device

A technology of subsynchronous oscillation and doubly-fed units, applied in circuit devices, reducing/preventing power oscillations, AC network circuits, etc., can solve problems such as large system power shortage and large power system safety accidents.

Active Publication Date: 2020-10-23
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the system is disturbed, it will cause sub-synchronous oscillation of the system, which may cause a large area of ​​the entire wind

Method used

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  • Subsynchronous oscillation suppression method for doubly-fed unit grid-connected system, and related device
  • Subsynchronous oscillation suppression method for doubly-fed unit grid-connected system, and related device
  • Subsynchronous oscillation suppression method for doubly-fed unit grid-connected system, and related device

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Embodiment Construction

[0047] See figure 1 , Shows a schematic diagram of a doubly-fed unit grid-connected system provided by an embodiment of the application, such as figure 1 As shown, the stator winding of the doubly-fed asynchronous wind generator DGIF is directly connected to the power grid, and the rotor winding is connected to the power grid through the converter. Specifically, the rotor winding is connected to the power grid through the rotor-side converter and the grid-side converter.

[0048] In order to improve the grid connection capability and power transmission capability of wind farms, capacitor C is usually connected in series on the transmission line, but under certain conditions, this will stimulate the subsynchronous oscillation of the wind turbine and the series compensation capacitor. When a small disturbance occurs in the system, the electrical quantity of the wind turbine grid-connected system may oscillate or even diverge, resulting in a unit disconnection. When the grid-connected...

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Abstract

The invention provides a subsynchronous oscillation suppression method for a doubly-fed unit grid-connected system, and a related device. The method comprises the following steps: obtaining a subsynchronous component in a grid-connected current, and converting the subsynchronous component of the grid-connected current to a rotor side, thereby obtaining a rotor side subsynchronous component; and feeding back the subsynchronous component of the rotor side to a current regulator of the rotor side to control the rotor current. The subsynchronous component in the grid-connected current induces thesubsynchronous component on the rotor side, and the subsynchronous component of the grid-connected current is converted to the rotor side, so compared with the prior art, the method has the advantagesthat a group of inverted sub-synchronous components are superposed on the rotor side equivalently, and the inverted sub-synchronous components can induce a group of inverted sub-synchronous components on the stator side, so that the subsynchronous components of stator current on the rotor side are counteracted, the sub-synchronous components introduced by a grid-side converter can be suppressed,and the sub-synchronous oscillation of the doubly-fed unit grid-connected system is suppressed more effectively.

Description

Technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a subsynchronous oscillation suppression method and related devices of a doubly-fed unit grid-connected system. Background technique [0002] With the increase in the penetration rate of the grid-connected wind power generation capacity in the power system, however, the reverse distribution pattern of wind resources and load centers, so large-scale and long-distance power transmission has become an effective way to utilize wind energy resources. [0003] In order to improve the grid-connected capacity and power delivery capacity of wind farms, it is usually necessary to connect capacitors in series on the transmission line to enhance the electrical connection between the wind farm and the system to increase the transmission power limit of the line, but this will stimulate wind turbines under certain conditions Subsynchronous oscillation with series compensation capac...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/381H02J2300/28
Inventor 周生孟祥志杨春源梁信信杨辉王圣明
Owner SUNGROW POWER SUPPLY CO LTD
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