Broadband additional sub/supersynchronous oscillation control method and control system
A control method and additional control technology, applied in the direction of reducing/preventing power oscillation, can solve the problems affecting the safe and stable operation of the power system, and achieve the effect of suppressing sub/super synchronous resonance
Active Publication Date: 2019-02-05
TSINGHUA UNIV +4
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Problems solved by technology
When the wind farm transmits power through the transmission line with series compensation capacitors, sub / supersynchronous resonance or oscillation may occur, mainly due to the induction generator effect, which will affect the safe and stable operation of the power system
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[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0022] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element refe...
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The invention discloses a broadband additional sub / super synchronous oscillation control method and control system. The method includes acquiring the total three-phase current ic on the fan side or the total three-phase current iL on the line side; filtering out the subsynchronous and supersynchronous harmonic components; compensating the phase delay, and / or performing at least one of phase offset and amplitude compensation; converting the current signal into the reference current ISVG of a stationary reactive power generator; calculating the additional control signal sent to the stationary reactive power generator according to the reference current ISVG and the reference value received by the stationary reactive power generator; and adjusting the additional control signal. The control method and control system are advantageous in that the total current of the fan side or the line side is acquired in real time, the additional control signal is calculated, and by controlling the stationary reactive power generator, the stationary reactive power generator is equivalent to the inductive impedance parallel to the bus at the sub / super synchronous frequency at which the resonance occurs to destroy the condition of the system resonance generation, thereby effectively suppressing the sub / super synchronous resonance of the system when the wind farm is connected.
Description
technical field [0001] The invention relates to the technical field of power system control, in particular to a broadband additional sub / super synchronous oscillation control method and control system. Background technique [0002] Wind energy is a widely distributed clean and sustainable energy, and my country's wind power generation is developing rapidly. Considering the reverse distribution of resources and load centers in my country, large-scale wind power long-distance transmission has become an inevitable trend. When the wind farm transmits power through the transmission line with series compensation capacitors, sub / supersynchronous resonance or oscillation may occur, which mainly affects the safe and stable operation of the power system. Contents of the invention [0003] The present invention aims to solve at least one of the above-mentioned technical problems. [0004] Therefore, the first object of the present invention is to provide a broadband additional sub / ...
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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 谢小荣贺静波常喜强宋瑞华王衡晏青乔元刘华坤
Owner TSINGHUA UNIV