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A device and method for subsynchronous oscillation suppression based on phase-locked loop error

A subsynchronous oscillation and suppression device technology, which is applied in the field of synchronous machines, can solve problems such as the inability to suppress subsynchronous oscillations, achieve effective detection and fast response, good dynamic response performance, and avoid device cost increases

Inactive Publication Date: 2017-12-12
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a subsynchronous oscillation suppression method and device based on phase-locked loop error, aiming to solve the technical problem that the prior art cannot suppress the subsynchronous oscillation

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  • A device and method for subsynchronous oscillation suppression based on phase-locked loop error
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  • A device and method for subsynchronous oscillation suppression based on phase-locked loop error

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] The present invention relates to a new type of sub-synchronous suppression method applied to thermal power units based on the parallel connection of fully-controlled switching devices, and more specifically relates to a detection of sub-synchronous oscillation components in the outlet voltage of synchronous machines by relying on phase-locked loop errors. By injecting the reactive current component of the same mode into the power grid to adjust the port voltage of the synchronous machine, and then adjust the active power of the synchronous output to achieve the control method of suppressing t...

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Abstract

The invention provides a subsynchronous oscillation suppression device and method based on phase-locked loop error, including a three-phase inverter, a control module and a signal detection module; the first input terminal of the signal detection module receives the three-phase AC voltage at the port of the synchronous machine , the second input terminal receives the three-phase AC voltage at the device port, and the third input terminal receives the three-phase AC current at the device port; the first input terminal of the control module is connected to the first output terminal of the signal detection module, and the second input terminal of the control module Receive the DC bus voltage, the third input end of the control module is connected to the third output end of the signal detection module, the fourth input end of the control module is connected to the fourth output end of the signal detection module, and the fifth input end of the control module is connected to The second output terminal of the signal detection module; the control module controls the reactive current according to the phase-locked error signal obtained by the signal detection module, and then adjusts the size of the electrical damping to suppress the subsynchronous oscillation of the system.

Description

technical field [0001] The invention belongs to the technical field of synchronous machines, and more specifically relates to a subsynchronous oscillation suppression method and device based on phase-locked loop errors. Background technique [0002] In 1970 and 1971, the Mohave power plant in the United States successively experienced shaft vibration damage accidents caused by the series compensation line of the turbogenerator, which made people start to notice that the dynamic process of the series capacitor compensation line would cause the torsional vibration of the shaft system of the synchronous generator problem and the problem of subsynchronous oscillations. This unstable oscillation frequency is much higher than the traditional low-frequency oscillation frequency range (0.3Hz-3Hz), but lower than the synchronous frequency of the system, so it is called subsynchronous resonance problem. In the analysis of traditional power systems with synchronous generators as the m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
Inventor 苗淼温生毅张祥成张博田旭袁小明胡家兵何维王龙飞
Owner STATE GRID CORP OF CHINA
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