Method and device for optimizing subsynchronous oscillation of synchronous machine based on HVDC rectifier side converter

Abstract

The invention discloses a method and device for optimizing subsynchronous oscillation of a synchronous machine based on an HVDC rectifier side converter. The method comprises the steps of obtaining three-phase AC voltage VABC of a converter bus of the HVDC rectifier side converter of an HVDC closed-loop control system, carrying out phase locking treatment and subsynchronous frequency conversion onthe three-phase AC voltage VABC to obtain to-be-damped subsynchronous oscillation modes and reserving the subsynchronous oscillation modes by using a band-pass filter; initiating subsynchronous oscillation through the HVDC closed-loop control system and then obtaining to-be-compensated phase angles of various subsynchronous oscillation modes according to a test signal method; and compensating a phase change caused by the HVDC closed-loop control system by using the phase angles and suppressing the subsynchronous oscillation initiated by the HVDC closed-loop control system. The suppression capability of a power system on the subsynchronous oscillation can be strengthened by using phase angle compensation, device upgrading and reconstruction of an existing converter are not needed, controlimplementation is simple and expansion is facilitated.

Description

technical field [0001] The invention belongs to the field of electric power system stability control, and more specifically relates to a method and a device for optimizing synchronous machine-order synchronous oscillation based on an HVDC rectifying side converter. Background technique [0002] The synchronous generator is one of the most important power supply equipment in the power system, with high economic value. The safe and stable operation of the synchronous generator plays an important role in the safety and stability of the power system. The sub-synchronous oscillation of synchronous generator belongs to the system oscillation instability. With the gradual increase of the unit capacity of the turbo synchronous generator, the shafting of the generator becomes more slender, and the characteristics of the shafting reflect more mechanical flexibility. It is easier to cause this kind of special electromechanical coupling interaction, which can seriously damage the power ...

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Problems solved by technology

[0008] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method and device for optimizing synchronous machine sub-synchronous oscillation for HVDC (high-voltage direct current, high-voltage direct current) rectifier side converters, thus solving the existing synchronous The generator subsynchronous oscillation method suffers from synchronous generator speed feedback errors and serious lags, and it is impossible to timely and effectively invest in synchronous generator subsynchronous oscillation suppressors; adopting multi-channel split-mode control SSDC for each torsional vibration mode may have an impact Technical issues with other generator sets

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