Subsynchronous oscillation inhibition apparatus and method for inhibiting flickering of power network
A technology of subsynchronous oscillation and suppression device, applied in the field of power grid, can solve problems such as power grid flicker, and achieve the effects of improving power quality level, suppressing subsynchronous oscillation, improving suppression effect and control flexibility
Active Publication Date: 2015-11-18
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 a power network, and discloses a subsynchronous oscillation inhibition apparatus and method for inhibiting flickering of a power network. The apparatus comprises a velometer connected with a generator set for detecting rotating speed signals of the generator set; a controller connected with the velometer for comparing the rotating speed signals detected by the velometer with standard rotating speed signals to obtain rotating speed deviation signals of the generator set and successively performing modal filtering and proportional phase shift on the rotating speed deviation signals so as to generate active current instructions and reactive current instructions; and a subsynchronous oscillation inhibiter connected with the controller for generating active currents and reactive currents which are corresponding to the active current instructions and the reactive current instructions under the driving effect of the controller and injecting the active currents and the reactive currents into the generator set and the power network so as to inhibit subsynchronous oscillation through the reactive currents and inhibit flickering of the power network through the active currents. The apparatus and method provided by the invention solve the problem of proneness to power network flickering in inhibition of the subsynchronous oscillation.
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