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An emergency control method and system for time-sharing commutation sequence based on energy function

An energy function and emergency control technology, applied in the direction of reducing/preventing power oscillation, single-net parallel feeding arrangement, etc., can solve problems such as power swing of tie lines, risk of safe and stable operation, and increase of system transient instability

Active Publication Date: 2020-11-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0002] With the expansion of the grid scale and the increasing number of regional interconnections, various uncertain operating variables and complex disturbance factors in the power system interfere with each other and affect each other, which can easily cause a large swing in the power of the tie line, which significantly increases the probability of transient instability in the system. probability, which brings a great risk to the safe and stable operation of the system

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  • An emergency control method and system for time-sharing commutation sequence based on energy function
  • An emergency control method and system for time-sharing commutation sequence based on energy function
  • An emergency control method and system for time-sharing commutation sequence based on energy function

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Embodiment

[0071] Commutation sequence technology is a new emergency power system control, in standalone system as an example of the infinite, figure 1 A three-phase power angle vector diagram as figure 1 , The normal operation of power angle δ s , When the system is disturbed desynchronization, power angle δ laid out to an angle between 90 ° ~ 180 °, then the need for "commutation sequence" operation, commutation sequence set threshold power angle δ m , When the system power angle [delta] = δ m When using the electronic device to power the primary side phase contact line is disconnected after the rapid displacement connector, A generator side, B, C in turn connected to a three-phase system C, A, B-phase, such as figure 2 Distance figure 2 Relative to the vector diagram of FIG sequential connection, figure 2 (A) is connected before and after commutation sequence phase sequence (commutation sequence is a front left, rear right is changing phase sequence), figure 2 (B) before and after commuta...

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Abstract

The invention discloses a time-sharing phase sequence change emergency control method and system based on an energy function. The method comprises the following steps: determining total energy of thesystem according to power angle and rotation speed of each power generator in the system under a preset time; if the total energy is less than or equal to critical energy, ending the control, or otherwise, determining a motion trajectory of each power generator; according to the motion trajectory of each power generator, judging that the power generator which reaches the 180-degree power angle first is a power generator having the most serious out-of-step fault; calculating and comparing system energy change values of the power generator having the most serious out-of-step fault from a presetmoment to different moments when the power angle reaches 180 degrees, and judging that the moment corresponding to the maximum energy change value is the phase sequence change moment of the power generator and carrying out phase sequence change operation on the power generator having the most serious out-of-step fault; and updating the preset moment to the phase sequence change moment of the powergenerator and re-calculating the system total energy. The method and system have the advantages of maintaining system integrity while restoring system stability and improving energy efficiency and safety of the power system.

Description

Technical field [0001] The present invention relates to the field of stabilizing control technology of power systems, and more particularly to a time-to-phase phase sequence emergency control method and system based on an energy function. Background technique [0002] As the grid is expanded, the regional interconnection is increasing, and various uncertain operation variables in the power system are interfere with each other, interacting each other, and impact each other, which is easy to swing, significantly increased the system's transient instability. The probability, which has a great risk to system security and stability operation. When the system is disturbed, the urgent control measures are commonly used include measures such as cutting machine, cut load, low frequency load, and malfunction. The commonality of these measures is to sacrifice the integrity of the power grid to a certain extent. Control the help system to restore stability. These measures have a faster and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/44H02J3/24
CPCH02J3/24H02J3/44
Inventor 黄少锋李轶凡张健黄罡肖仕武罗阳静宜
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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