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Short-circuit failure current model and current zero prediction algorithm based on same

A technology of short-circuit fault and current model, which is applied in the direction of measuring current/voltage, computing, measuring devices, etc., and can solve problems such as difficulty in converging to the true value

Active Publication Date: 2014-12-03
DALIAN UNIV OF TECH +1
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Problems solved by technology

Each algorithm has a common difficulty, that is, the processing of exponential functions is difficult to converge to the true value when the time constant of the system loop is small

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  • Short-circuit failure current model and current zero prediction algorithm based on same
  • Short-circuit failure current model and current zero prediction algorithm based on same
  • Short-circuit failure current model and current zero prediction algorithm based on same

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Embodiment Construction

[0030] The specific implementation of the present invention will be described in detail below in conjunction with the technical scheme and accompanying drawings.

[0031] From the perspective of the nature of the fault current, there is no essential difference between the normal current of the line and the fault current in the power system, but the magnitude of the impedance change between the two is different. Then at any moment, the line can be equivalent to a unified circuit, such as figure 2 shown. figure 2 The middle CB refers to the circuit breaker, let U(t) be the system power supply voltage, U Pk is the peak value of the system power supply voltage, I(t) is the short-circuit fault current on the power supply side, L S and R S is the source side impedance, L L and R L is the load-side impedance, ω is the angular frequency of the power supply, assuming that the short-circuit fault occurs at t=0, then α is the phase angle of the voltage when the short-circuit fault...

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Abstract

The invention provides a short-circuit failure current model and short-circuit failure current zero prediction algorithm based on the same, which can realize the chosen fault interruption (CFI) of the short-circuit failure current can be realized. Expression of the model is I(t)= A.I(t-Tau S)+B.sin omega t+C.cos omega Tau, wherein parameters A, B and C to be determined are obtained through fading memory recursive least square method, the estimated current expression is calculated to predict the short-circuit failure current zero and to realize the short-circuit failure current CFI control. Due to the adoption of the short-circuit failure current model and the current zero prediction algorithm, the current zero point can be rapidly and accurately predicted, truncation error does not exist on the theory, only the current data is required for the parameter calculation, and a complicate three-phase electric power system is easy to expand to. By adopting the algorithm, the precision requirement of the CFI algorithm can be satisfied, and the short-circuit failure protection of the system can be completed with the cooperation of a relay protection device.

Description

technical field [0001] The invention belongs to the field of electric high-voltage switches, and relates to a short-circuit fault current model and a current zero-point prediction algorithm based on the model. Background technique [0002] During the operation of the power system, faults often occur, such as short-circuit faults. When this type of fault occurs, the circuit breaker on the line needs to break the circuit immediately to protect other equipment connected to the system. [0003] An arc is generated during the breaking process of the high-voltage AC circuit breaker. When the current crosses zero and the contact distance is sufficient, the arc is extinguished. During the current breaking process, the opening contacts of the circuit breaker are subjected to high arc thermal pressure and insulation strength pressure. In order to ensure the successful breaking of the short-circuit fault current, the contacts are required to have a minimum opening distance before the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01R19/175
Inventor 段雄英黄智慧廖敏夫邹积岩万慧明叶念国梁俊滔
Owner DALIAN UNIV OF TECH
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