Damping controller for restricting secondary synchronous oscillations and control method thereof

Abstract

The invention relates to a damping controller for restricting secondary synchronous oscillations based on a direct current power transmission control protecting system and a control method thereof. The controller comprises a low-pass filtering module (1) for filtering high frequency components in signals, a phase locking ring module (2) for acquiring stable signals, a band-pass filtering module (3) for extracting relevant components of secondary synchronous oscillation frequency to processed signals, a phase-shifting module (4) for carrying out phase-shifting processing to the relevant components of secondary synchronous frequency, wherein the input end of the low-pass filtering module (1) is taken as signal input quantity of the controller for collecting alternating current bus voltage of a converter station; the input end of the phase locking ring module (2) is connected with the output end of the low-pass filtering module (1); the output end of the phase locking ring module (2) is connected with the input end of the band-pass filtering module (3); and the input end of the phase-shifting module (4) is connected with the output end of the band-pass filtering module (3). The damping controller can effectively restrict the problem of secondary synchronous oscillations of a direct current system, and has the advantage of utilizing the existing high-pressure direct current control protecting system to realize the restriction to a plurality of synchronous oscillation modes.

Description

technical field [0001] The present invention relates to a damping controller for suppressing subsynchronous oscillation and its control method, in particular to a damping controller for suppressing subsynchronous oscillation based on a DC transmission control and protection system, which belongs to the subsynchronous oscillation suppression and damping based on a DC transmission control and protection system Innovative technologies for controllers and their control methods. Background technique [0002] In the rectifier station of the HVDC transmission system, the large-scale steam turbine unit may interact with the DC control system, and the risk of torsional vibration of the unit shafting, that is, subsynchronous oscillation (Subsynchronous Oscillation, SSO) occurs. If the vibration is not controlled, it will cause damage to the shafting system and cause significant property loss to the equipment. At present, the high-voltage direct current project adopts the mature contr...

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Problems solved by technology

If the vibration is not controlled, it will cause damage to the shafting system and cause major property losses to the equipment

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