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Online self-tuning system for phase-shifting control parameters of subsynchronous oscillation suppression system

A sub-synchronous oscillation and phase-shift control technology, which is applied in the direction of reducing/preventing power oscillation, can solve problems such as error-prone, cumbersome offline calculation process, and increase error probability, so as to reduce the test workload.

Active Publication Date: 2018-02-27
NR ELECTRIC CO LTD +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The offline calculation process is cumbersome and error-prone, and manually setting the calculation results into the device also increases the probability of error

Method used

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  • Online self-tuning system for phase-shifting control parameters of subsynchronous oscillation suppression system
  • Online self-tuning system for phase-shifting control parameters of subsynchronous oscillation suppression system
  • Online self-tuning system for phase-shifting control parameters of subsynchronous oscillation suppression system

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Embodiment Construction

[0037] The present invention will be further explained below in conjunction with the accompanying drawings: an SVG-based subsynchronous oscillation damping control system consists of three parts, including a subsynchronous damping control device, SVG and an isolation transformer, such as figure 1 Shown. When the working mode switch K is connected to the lower end, the system works in the closed-loop suppression control mode. The subsynchronous oscillation damping control device receives the speed signal of the group, combined with the generator current and voltage information, detects the torsional vibration state of each mode of the subsynchronous oscillation, and calculates The sub-synchronous damping control signal is sent to the SVG controller. The SVG system uses power electronic converter technology to inject sub-synchronous and super-synchronous compensation currents into the machine network system. The sub-synchronous current entering the unit side interacts with the sta...

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Abstract

The invention discloses an online self-tuning system for phase-shifting control parameters of a subsynchronous oscillation suppression system. The online self-tuning system for the phase-shifting control parameters of the subsynchronous oscillation suppression system comprises a rotating speed signal mode filtering unit, a filtering time-delay compensation unit, a waveform transformation unit, a phase-shifting angle generation unit and a phase-shifting controller generation unit. The subsynchronous oscillation suppression system works in an open-loop control parameter test mode and outputs subsynchronous damping control command signals in the sine wave form within a certain time according to the set torsion frequency and amplitude, and compensating current is generated through a power electronics power unit and injected into a generator set to stimulate the torsional vibration response of a shaft system; the subsynchronous damping control command signals and generator rotating speed signals are collected and sent to the online self-tuning system, and the online self-tuning system completes signal analysis and calculation automatically and saves calculation results in correspondingfixed value items. By means of the method, manual participation in off-line calculation is not needed, and thus the tuning calculation workload is greatly reduced.

Description

Technical field [0001] The invention relates to the technical field of power system subsynchronous oscillations, in particular to an online self-tuning system for phase shift control parameters of a subsynchronous oscillation suppression system. Background technique [0002] For those “point-to-grid” power plants that have long-distance power transmission through series compensation or DC transmission, the power system is prone to subsynchronous oscillations and cause torsional vibration of the turbine generator shaft system. At present, in order to suppress the torsional vibration of the shaft system and reduce the damage of the subsynchronous oscillation to the generator shaft, control links are added to the control system such as power electronics, such as additional excitation damping control system (SEDC), static compensator (SVC, SVG, etc.) ), NGH dampers, etc. Since the excitation control system, SVC, and SVG are all finalized mass production equipment, and the calculatio...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 王凯张琦雪王光陈俊陈佳胜郭自刚李华忠
Owner NR ELECTRIC CO LTD
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