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Flexible direct current additional subsynchronous oscillation control system for suppressing subsynchronous resonance and oscillation

A technology of sub-synchronous oscillation and sub-synchronous resonance, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as reducing the life of the shafting of the turbo-generator, fracture of the shafting of the turbo-generator, and sub-synchronous resonance, etc. Modal subsynchronous resonance and oscillation issues, improved subsynchronous stability, full-featured effects

Inactive Publication Date: 2014-04-16
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these devices may cause subsynchronous resonance (SSR, Subsynchronous Resonance) or subsynchronous oscillation (SSO, Subsynchronous Oscillation) problems under certain conditions
Slight SSR / SSO will reduce the life of the turbogenerator shafting, and severe SSR / SSO can cause the shafting of the turbogenerator to break, threatening the safe and stable operation of the unit and the power system

Method used

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  • Flexible direct current additional subsynchronous oscillation control system for suppressing subsynchronous resonance and oscillation
  • Flexible direct current additional subsynchronous oscillation control system for suppressing subsynchronous resonance and oscillation
  • Flexible direct current additional subsynchronous oscillation control system for suppressing subsynchronous resonance and oscillation

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Embodiment 1

[0029] see figure 1 and figure 2 , an embodiment of the present invention provides a subsynchronous damping control system that effectively suppresses subsynchronous resonance and oscillation, specifically including: a feedback signal processor, a multi-mode bandpass filter, a multi-mode proportional phase shifter, and a modal control signal synthesis device, control signal appender.

[0030] Among them, the feedback signal processor is used to detect the signal that can reflect the subsynchronous oscillation, including the speed of the nose and tail, the current or power of the machine terminal or line, after the signal is obtained, the feedback signal containing only the subsynchronous frequency component is obtained after processing .

[0031] Since the detected signal that can reflect the subsynchronous oscillation contains many components, such as normal operation components, high frequency noise and low frequency noise. The detected signal passes through the feedback...

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Abstract

The invention provides a flexible direct current additional subsynchronous oscillation control system for suppressing subsynchronous resonance and oscillation. The system comprises a feedback signal processor, a multi-mode band-pass filter, a multi-mode proportional phase shifter, a mode control signal synthesizer and an additional signal controller. A subsynchronous damping control strategy is added on a flexible direct current control system, a plurality of torsional vibration modes can be suppressed at the same time, functions are comprehensive, multi-mode subsynchronous resonance and oscillation of a power system can be achieved, subsynchronous stability of the system is improved, transmission capacity of a power grid is further improved, and safety of a generator is ensured.

Description

technical field [0001] The invention relates to the technical field of power system stability and control, in particular to a flexible DC additional sub-synchronous oscillation control system that effectively suppresses sub-synchronous resonance and oscillation. Background technique [0002] At present, the demand for long-distance large-capacity power transmission continues to rise, especially because large-scale coal power and wind power bases are far away from the load center, and most of them use long-distance power transmission. In order to improve the transmission capacity and system stability of long-distance large-capacity transmission, more and more fixed series capacitor compensation (FSC, FixedSeriesCompensation), traditional high-voltage direct current transmission (HVDC, HighVoltageDirectCurrentTransmission), flexible high-voltage direct current transmission and some power-based Electronic high-speed control device. However, these devices may cause subsynchrono...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 杨煜邓晶李凌飞黄莹黎小林李岩
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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