Method for suppressing subsynchronous transient oscillation of generator set

Abstract

The invention provides a method for suppressing subsynchronous transient oscillation of a generator set. The method comprises a subtransient detection algorithm for the subsynchronous oscillation of the generator set and a subtransient suppression algorithm for the subsynchronous oscillation of the generator set. Subsynchronous oscillation of the generator set is divided into transient oscillation and substable oscillation, a subtransient oscillation moment is detected through a subtransient detection algorithm of the subsynchronous oscillation of the generator set, a subtransient suppression algorithm of the subsynchronous oscillation of the generator set is triggered, and a current source is controlled to output a current signal required by suppression. And the suppression of the subsynchronous transient oscillation of the generator set is completed. On the basis of a traditional subsynchronous oscillation suppression method, a subtransient detection algorithm for subsynchronous oscillation of the generator set and a subtransient suppression algorithm for subsynchronous oscillation of the generator set are added. The peak value of torsional vibration of the generator set shaft system caused by transient faults or disturbance of the system can be effectively reduced, fatigue accumulation of the generator set shaft system caused by transient events is reduced, and the service life of the generator set shaft system is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of control algorithms controlled by power electronic devices, in particular to a method for suppressing subsynchronous transient oscillations of generator sets. Background technique [0002] Subsynchronous oscillation is one of the common hazards in power grids. In recent years, with the development of the power system, sub-synchronous phenomena have occurred frequently, and incidents with serious consequences have frequently occurred. [0003] For motors with frequent subsynchronous resonance phenomena, in order to avoid serious consequences, various measures have been used in engineering practice to suppress the occurrence of subsynchronous resonance. Such as STATCOM, SEDC and other equipment. [0004] Most of the existing subsynchronous oscillation suppression equipment calculates the suppression instruction through the rotational speed signal through the modal filter. A subsynchronous suppression sign...

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Problems solved by technology

[0005] However, the modal filter used in the traditional suppression of subsynchronous oscillation has a long response time in the transient process, and the instructions calculated in the transient state cannot suppress the transient process, and may even generate a certain degree of excitation. The same SEDC equipment There is also insufficient response speed to suppress the subtransient process

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