Subsynchronous oscillation suppression method and related device for grid-connected system of doubly-fed units
A technology of subsynchronous oscillation and doubly-fed units, applied in circuit devices, reducing/preventing power oscillation, AC network circuits, etc. The effect of removing sub-sync components
Active Publication Date: 2022-05-24
SUNGROW POWER SUPPLY CO LTD
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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 farm grid-connected unit to go off-grid, resulting in a large system power deficit, which will cause a large power system safety accident
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[0047] See figure 1 , showing a schematic diagram of a grid-connected system for a doubly-fed unit provided by an embodiment of the present application, such as figure 1 As shown, the stator winding of the double-fed asynchronous wind turbine 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-connected 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, and the unit may be disconnected from th...
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This application provides a subsynchronous oscillation suppression method and related devices for the grid-connected system of double-fed units. The method first obtains the subsynchronous component of the grid-connected current, and then converts the subsynchronous component of the grid-connected current to the rotor side to obtain The secondary synchronous component; and the secondary synchronous component on the rotor side is fed back to the current regulator on the rotor side to control the rotor current. The sub-synchronous component in the grid-connected current will induce a sub-synchronous component on the rotor side, and after converting the sub-synchronous component of the grid-connected current to the rotor side, it is equivalent to superimposing a set of anti-phase sub-synchronous components on the rotor side. The anti-phase component will induce a set of reverse sub-synchronous components on the stator side, thereby offsetting the sub-synchronous component of the stator current on the rotor side, and at the same time can suppress the sub-synchronous component introduced by the grid-side converter, and more effectively suppress the double-fed unit. Subsynchronous oscillations in grid-connected systems.
Description
technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a method for suppressing subsynchronous oscillation of a grid-connected system of a doubly-fed unit and a related device. Background technique [0002] With the increase in the penetration rate of wind power generation grid-connected capacity in the power system, 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 capability and power transmission capability 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 excite the wind turbine under certain conditions. Subsynchronous oscillation with series compen...
Claims
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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