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System Level Protection System and Method for Sub/Super Synchronous Resonance/Oscillation

A protection system, super-synchronous technology, applied in the direction of control/regulation system, reduction/prevention of power oscillation, general control system, etc., can solve the problem of inaccurate measurement of the impact of wind turbines, low reliability and safety, poor accuracy, etc. problem, to achieve the effect of improving safety and reliability, reliable protection method, and low loss

Active Publication Date: 2019-03-01
TSINGHUA UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the protection methods based on voltage, current or power still have major defects, because these quantities cannot accurately measure the impact of a certain wind turbine or a wind farm on the entire system, and sub / super synchronous Resonance / oscillation is the dynamic behavior of the whole system, so the protection should also be based on the whole system. Only using local information to judge the protection behavior has poor accuracy, low reliability and safety, and needs to be improved urgently

Method used

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  • System Level Protection System and Method for Sub/Super Synchronous Resonance/Oscillation
  • System Level Protection System and Method for Sub/Super Synchronous Resonance/Oscillation
  • System Level Protection System and Method for Sub/Super Synchronous Resonance/Oscillation

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Embodiment Construction

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0040] The system-level protection system and method for sub / supersynchronous resonance / oscillation according to the embodiments of the present invention will be described below with reference to the accompanying drawings. Protection System.

[0041] figure 1 It is a structural schematic diagram of a sub / super synchronous resonance / oscillation system-level protection system according to an embodiment of the present invention.

[0042] Such as figure 1 As shown, the sub / supersynchronous resonance / oscillation system-level protec...

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Abstract

The invention discloses a sub / super synchronous resonance / oscillation system-level protection system and method, wherein the system includes: a centralized protection coordinator and multiple distributed protection relays, and each distributed protection relay of the multiple distributed protection relays The protection relay collects the three-phase voltage and current of the corresponding device port, obtains the time domain waveform of the voltage and current, obtains the sub / super synchronous impedance, and triggers the local Protection action; the centralized protection coordinator obtains the sub / super synchronous impedance of the wind farm measured by multiple distributed protection relays, so as to obtain the sub / super synchronous aggregate impedance of the system according to the preset circuit topology, and in the sub / super synchronous When the aggregate impedance does not meet the stability conditions, obtain the best cut-off strategy to generate a system-level protection signal. The system can provide accurate, fast and reliable protection measures, thereby effectively improving the stability and security of the system to reduce losses drop to lowest.

Description

technical field [0001] The invention relates to the technical field of power system protection, in particular to a sub / super synchronous resonance / oscillation system-level protection system and method. Background technique [0002] In recent years, renewable energy power generation (such as wind power, photovoltaic power generation, etc.) has developed rapidly. However, the grid connection of renewable energy power generation has brought new challenges to the stable operation of the power system. For example, the sub / supersynchronous resonance / oscillation caused by the interaction between the converter-based wind turbine and the AC grid may cause a large area of ​​wind turbines to go off-grid, and even seriously threaten the stable operation of power equipment and the entire system. [0003] For the sub / supersynchronous resonance / oscillation protection of the steam turbine generator set, most of the related technologies use the shaft speed as the input, which cannot be appli...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J3/24H02J3/46
CPCH02H7/262H02H7/263H02J3/24H02J3/46H02J3/01H02J3/381H02J2310/10H02J2300/28Y02E10/76Y04S10/00Y02E40/40H02J3/242G05B17/02H02H1/0092H02J3/40
Inventor 谢小荣刘威
Owner TSINGHUA UNIV
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