A subsynchronous oscillation suppression device and method for suppressing power grid flicker
A sub-synchronous oscillation and suppression device technology, applied in the field of power grid, can solve problems such as power grid flicker, achieve the effect of improving power quality level, improving suppression effect and control flexibility, improving service life and electricity safety
Active Publication Date: 2018-05-04
CHINA SHENHUA ENERGY CO LTD +5
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[0005] The purpose of the present invention is to provide a subsynchronous oscillation suppression device and method for suppressing power grid flicker, which is used to solve the problem that power grid flicker is easy to occur in subsynchronous oscillation suppression
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[0019] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0020] Such as figure 1 As shown, in the power system, the generator set 102 transmits electric energy to the grid 105 through the transformer and the transmission line. In order to reduce the transmission loss of the transmission line, the method of increasing the series compensation is often used to improve the transmission capacity of the transmission line. However, this method of increasing series compensation may also cause the problem of subsynchronous oscillation, causing the generator set to operate at an oscillation frequency lower than the synchronous frequency, which seriously affects the safety of the power system. Therefore, many devices to suppress...
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The invention relates to the technical field of power grids, and discloses a subsynchronous oscillation suppression device and method for suppressing power grid flicker. The device includes: a tachometer, connected to a generator set, for detecting the rotational speed signal of the generator set; a controller, which Connecting the tachometer is used to compare the speed signal detected by the speed detector with the standard speed signal to obtain the speed deviation signal of the generator set, and perform modal filtering and proportional phase shifting on the speed deviation signal in order to generate active power A current command and a reactive current command; a subsynchronous oscillation suppressor, which is connected to the controller, and is used to generate active current and reactive current corresponding to the active current command and the reactive current command under the drive of the controller , and inject the active current and reactive current into the generator set and the grid to suppress subsynchronous oscillation through reactive current, and suppress grid flicker through active current. The invention solves the problem that grid flicker is easily generated in subsynchronous oscillation suppression.
Description
technical field [0001] The invention relates to the technical field of power grids, in particular to a subsynchronous oscillation suppression device and method for suppressing power grid flicker. Background technique [0002] With the development of the power system, ultra-high voltage, long-distance transmission lines and large-capacity generators have begun to be put into operation, and measures such as line series capacitor compensation and direct current transmission to improve the stability and transmission capacity of the power system have also begun to be widely used. However, in addition to the accompanying huge economic benefits, these devices and measures also have an impact on the safe and stable operation of the power system, the most prominent of which is the ensuing subsynchronous oscillation of the power system. In order to solve the problem of subsynchronous oscillation, those skilled in the art have proposed many methods to suppress subsynchronous oscillatio...
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IPC IPC(8): H02J3/24
Inventor 宋畅黄立李健岳征宇杨文超袁丁于洋温浩武云生
Owner CHINA SHENHUA ENERGY CO LTD