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Time-sharing phase sequence change emergency control method and system based on energy function

An energy function and emergency control technology, applied in the direction of single-network parallel feed arrangement, reducing/preventing power oscillation, etc., can solve the problems of safe and stable operation risk, increasing system transient instability, power swing of tie line, etc.

Active Publication Date: 2019-11-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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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

Method used

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  • Time-sharing phase sequence change emergency control method and system based on energy function
  • Time-sharing phase sequence change emergency control method and system based on energy function
  • Time-sharing phase sequence change emergency control method and system based on energy function

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Embodiment

[0071] The phase commutation sequence technology is a new type of emergency control technology for power systems. Taking the single-machine pair infinite system as an example, figure 1 is the three-phase power angle vector diagram, such as figure 1 As shown, the power angle in normal operation is δ s , when the system is out of step after being disturbed, and the power angle δ swings to an angle between 90° and 180°, it is necessary to perform a "phase commutation sequence" operation, and the power angle threshold of the commutation sequence is set to δ m , when the power angle of the system δ=δ m When using the power electronic device to disconnect the phases of the primary side of the connecting line and quickly dislocate the connection, the three phases A, B, and C of the generator side are connected to the three phases of C, A, and B of the system in sequence, such as figure 2 as shown, figure 2 It is the phase vector diagram and the phase sequence connection diagram,...

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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 invention relates to the technical field of power system stability control, in particular to an energy function-based emergency control method and system for time-sharing commutation sequences. Background technique [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 chance of transient instability in the system. probability, which brings great risks to the safe and stable operation of the system. When the system is disturbed and unstable, the commonly used emergency control measures include machine cutting, load shedding, low-frequency load shedding, and out-of-step decoupling. Control helps restore stability to the system. These measures have a more rapid and o...

Claims

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Application Information

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Patent Type & Authority Applications(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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