Blocking filter capable of effectively suppressing three forms of subsynchronous resonances

Abstract

The invention discloses a blocking filter capable of effectively suppressing three forms of subsynchronous resonances. The blocking filter comprises at least two orders of (called a Y order and a Y+ order) of parallel resonance circuits which are connected in series, wherein the resonant frequency of one order (Y order) corresponds to an inherent torsion frequency of a generator set shaft system and is used for suppressing a machine-network composite resonance problem and a transient torque amplification problem; and the resonant frequency of the other order (Y+ order) corresponds to an asynchronous excitation frequency of an asynchronous excitation problem caused by the Y-order blocking filter. A high-Q-value reactor is adopted by the resonance circuit (Y order) for correspondingly solving the machine-network composite resonance problem while a low-Q-value reactor is adopted by the new resonance circuit (Y+ order) for correspondingly solving the asynchronous excitation problem; and a Q value of the high-Q-value reactor is 100-220 in general and the Q value of the low-Q-value reactor is 30-60 in general.

Description

technical field [0001] The technical field of the present invention belongs to the fields of motors, electrical devices and electric energy, and relates to a generator set subsynchronous resonance prevention and suppression device. The blocking filter in the present invention can suppress the subsynchronous frequency (including the machine-grid composite resonance) flowing into the grid-connected generator. , transient torque amplification and asynchronous self-excitation frequency) current, so as to prevent and suppress subsynchronous resonance. Background technique [0002] At present, series capacitor compensation is an economical and effective measure to improve the power transmission capacity of long-distance transmission lines. However, adding series capacitor compensation on the transmission line is likely to cause subsynchronous resonance of the nearby generator set shafting, resulting in damage to the large shaft of the generator set. In order to eliminate the above...

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Problems solved by technology

[0009] In view of this, the purpose of the present invention is to: propose the use of a two-order blocking filter to solve the machine-network composite resonance problem, transient torque amplification problem and asynchronous self-excitation problem of a certain mode of the unit

The resonant circuit (Y order) corresponding to solve the problem of machine-network composite resonance adopts a high-Q reactor, while the new resonant circuit (Y+ order) corresponding to solving the problem of asynchronous self-excitation adopts a low-Q reactor, and the high-Q reactor The Q value is generally between 100 and 220, and the Q value of the low Q value reactor is generally between 30 and 60.

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