Method and apparatus for obtaining hyposynchronous oscillation revolution speed signal
A technology of subsynchronous oscillation and rotational speed signal, applied in reactive power compensation, reactive power adjustment/elimination/compensation and other directions, it can solve the problems of low precision, limited output and input channels, etc., and achieve the effect of high precision
Active Publication Date: 2009-08-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0006] The existing speed output signals simulated by RTDS are all output to the subsynchronous oscillation suppression and protection device through the digital-to-analog conversion interface. The obtained speed signal is an analog signal, which is different from the actual speed digital signal representation method, and Limited by the output and input channels, the accuracy is not high
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[0023] In a scheme for obtaining a subsynchronous oscillation speed signal provided by an embodiment of the present invention, firstly, the angle of rotation of the shaft of the turbo-generator is detected, and the detected angle of rotation of the shaft of the turbo-generator is processed through gain processing and modulation Processing and conversion Processing obtains the shafting speed pulse of the generator.
[0024] In the above process, the corresponding gain processing can be based on the gain multiplier determined by the turbo-generator gear, and the gain processing can be performed on the angle that the turbo-generator shaft rotates to obtain the gain angle; the corresponding modulation process can be the The angle modulation is a value that changes continuously in the interval from 0 to 2π; the corresponding conversion process can be obtained after the modulation process The angle that changes continuously in the interval from 0 to 2π is obtained through comparison ...
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The invention provides a method for obtaining sub-synchronous oscillation rotational speed signal and a device thereof, relating to the electric power field. The method for obtaining sub-synchronous oscillation rotational speed pulse comprises the following steps: angles turned by a steam turbine generator shaft are checked; gain processing is conducted to the checked angles turned by a steam turbine generator shaft; modulation processing is conducted to the obtained angles after the gain processing, thus obtaining continuously changing angles within the interval from 0 to 2 Pi; and conversion processing is conducted to the angles continuously changing within the interval from 0 to 2 Pi, thus obtaining rotational speed pulse of the generator shaft. The device for obtaining sub-synchronous oscillation rotational speed pulse comprises a gear checking unit, a gain unit, a modulation unit and a conversion unit. The embodiments of the invention artificially obtain the rotational speed pulse of the generator shaft with relatively high accuracy through RTDS; the rotational speed pulse of the generator shaft with relatively high accuracy is considered as the input quantity of the suppressing and protection devices of the sub-synchronous oscillation, therefore, the sub-synchronous oscillation can be better suppressed and protected.
Description
technical field [0001] The invention relates to the field of electric power, in particular to a method and a device for obtaining a subsynchronous oscillation speed signal. Background technique [0002] Series capacitance compensation in AC transmission system is a very economical method to improve line transmission capacity, control power distribution between parallel lines and enhance power system transient stability. However, the series capacitance compensation reduces the electrical damping of the torsional vibration frequency of the turbogenerator shafting, which may cause the continuous vibration of the shafting and grid interaction, that is, subsynchronous resonance. Subsynchronous resonance and generator shaft torsional vibration caused by power electronic devices such as high-voltage direct current transmission and static var compensation devices are collectively referred to as subsynchronous oscillation. [0003] At present, subsynchronous oscillation suppression ...
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IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 毕天姝张鹏薛安成杨奇逊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)