Method and device for suppressing subsynchronous oscillation based on impedance characteristics of doubly-fed fan
A sub-synchronous oscillation and doubly-fed fan technology, applied in the direction of circuit devices, generator control circuits, reducing/preventing power oscillation, etc., can solve the problems of limited suppression ability of virtual resistance method and inability to completely suppress sub-synchronous oscillation, etc., to achieve suppression The effect of good ability, large damping and simple parameter design
Active Publication Date: 2022-08-02
HUAZHONG UNIV OF SCI & TECH +1
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Problems solved by technology
However, the suppression ability of the virtual resistance method is limited. When the system damping is weak, the single virtual resistance method may not be able to completely suppress the subsynchronous oscillation
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[0048] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0049] figure 1 Shown is a schematic structural diagram of a grid-connected system for a doubly-fed fan via a series compensation capacitor provided by an embodiment of the present invention. The double-fed wind turbine is equivalent to a 100MW wind turbine, and the wind turbine is connected to the transmission network through 0.69kV / 35kV and 35kV / 230kV step-up transformers. In the transmission ne...
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The invention discloses a method and a device for suppressing subsynchronous oscillation based on the impedance characteristic of a double-fed fan, belonging to the technical field of electrical engineering. Including: establishing a simplified mathematical model of the doubly-fed fan according to the participation factor analysis of the fan state space model; establishing the port impedance expression model of the doubly-fed fan based on the simplified model of the fan and the actual control parameters; based on the difference between the factors in the expression The relationship between the amplitude and phase of the DFIG rotor side converter is obtained, and the gain coefficient of the newly added control branch of the doubly-fed fan rotor-side converter is obtained. The invention can better adjust the phase size of the fan port impedance only by adjusting the gain coefficient of the newly added branch of the doubly-fed fan rotor side converter. By using this new branch, the phase angle difference between the wind turbine and the power transmission network can be effectively reduced, thereby suppressing the subsynchronous oscillation of the system. Compared with the traditional virtual resistance method, this control method has better suppression effect.
Description
technical field [0001] The invention belongs to the technical field of electrical engineering, and more particularly, relates to a method and a device for suppressing subsynchronous oscillation based on the impedance characteristic of a doubly-fed fan. Background technique [0002] Wind power generation has the advantages of renewable, low pollution, etc., and has become an irreplaceable part of the modern power industry. Large-scale wind farms are mainly distributed in remote areas. In order to solve the problem of long-distance power transmission, fixed series compensation is widely used in the power transmission network. However, the introduction of fixed series compensation will bring the risk of subsynchronous oscillation (SSO) to the system. At present, many synchronous oscillation events have been reported at home and abroad. In 2009, a subsynchronous oscillation accident occurred in the double-fed wind farm in Texas, USA. The accident caused a large number of wind ...
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IPC IPC(8): H02J3/24H02J3/38H02J3/18H02P9/00H02P101/15
CPCH02J3/241H02J3/38H02J3/1807H02P9/007H02J2203/20H02P2101/15Y02E40/30
Inventor 吴思成孙海顺黄碧月韩应生毛俞杰朱廷猛王东泽王靖然丁然徐海翔王若阳
Owner HUAZHONG UNIV OF SCI & TECH