Subsynchronous oscillation suppression device and method based on phase-locked loop error

Abstract

The invention provides a subsynchronous oscillation suppression device and method based on a phase-locked loop error. The subsynchronous oscillation suppression device comprises a three-phase inverter, a control module and a signal detection module, wherein a first input end of the signal detection module is used for receiving the three-phase AC voltage of a synchronizer port, a second input end is used for receiving the three-phase AC voltage of a device port, a third input end is used for receiving the three-phase AC current of the device port, a first input end of the control module is connected to a first output end of the signal detection module, a second input end of the control module is used for receiving a DC bus voltage, a third input end of the control module is connected to a third output end of the signal detection module, a fourth input end of the control module is connected to a fourth output end of the signal detection module, a fifth input end of the control module is connected with a second output end of the signal detection module, the control module is used for further adjusting electrical damping size through control of reactive current according to a phase-locked error signal obtained by the signal detection module, so that the subsynchronous oscillation of a system is suppressed.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for precise timing adjustment between two electrical machines connected together without any interference from other devices like motors or generators. By utilizing this system, there are no physical contact needed during operation while ensuring accurate alignment with each other's movements. Additionally, the use of advanced techniques called Phase Lock Loop Error has been developed to improve upon current systems. Overall, these technical features enhance efficiency and reliability in electricity generation equipment.

Problems solved by technology

Technological Problem: The technical problem addressed in this patented paper relates to prevention of subsynchronization between two phases of an AC motor driven electric generating station when subjected to submerged DC link failure due to fluctuating voltages from overlapping parts of active elements like diodes and transistor components.

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