Simplified calculating method of double-fed motor three-phase short circuit current maximum

A technology of maximum current value and phase short-circuit current, which is applied in calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of complex complex number calculation and inconvenient application, and achieve simplified calculation methods with both accuracy and Practicality, the effect of avoiding complex operations

Inactive Publication Date: 2017-05-31
HOHAI UNIV
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Problems solved by technology

However, the calculation expression of the three-phase short-circuit current of the doubly-fed wind turbine considering the resistance value of the crowbar contains multiple parameters and is nonlinear, and involves complex complex calculations, which is inconvenient to apply in actual engineering

Method used

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  • Simplified calculating method of double-fed motor three-phase short circuit current maximum
  • Simplified calculating method of double-fed motor three-phase short circuit current maximum
  • Simplified calculating method of double-fed motor three-phase short circuit current maximum

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Embodiment

[0090] The typical parameters of 1MW double-fed wind turbine are as follows: rated capacity 1MW; rated voltage 690V; stator leakage inductance 0.10pu; rotor leakage inductance 0.11pu; excitation inductance 4.5pu; stator resistance 0.0054pu; The stable running speed is 0.95pu.

[0091] Using the typical parameters of a 1MW doubly-fed wind turbine, the transient process of the DFIG three-phase short-circuit fault is simulated in PSCAD / EMTDC. The simulation results are as follows figure 2 shown. It can be seen from the simulation results that the formula for calculating the maximum value of the short-circuit current proposed by the present invention has better accuracy.

[0092] Table 1 Comparison of the calculation results of the maximum value of the short-circuit current under the parameters of different capacity DFIGs

[0093]

[0094]

[0095]Table 1 shows the calculation results of the maximum value of short-circuit current before and after the simplification obtain...

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Abstract

The invention discloses a simplified calculating method of a double-fed motor three-phase short circuit current maximum. The method comprises the steps of firstly giving a double-feed motor three-phase short circuit current calculating formula which calculates a Crowbar resistor; then utilizing a sensitivity analyzing method to analyze the influencing degrees of various physical quantities on the sizes of the short circuit currents in the formula, and extracting a group of parameters which have greater influence degrees on the short circuit currents; finally utilizing the extracted parameters and multiple linear regression to analyze and deduce the simplified calculating formula of the double-feed motor three-phase short circuit current maximum. A simple method is provided for calculation of the double-fed motor three-phase short circuit current maximum, the calculating accuracy and practicability are achieved at the same time, and the simplified calculating method of the double-fed motor three-phase short circuit current maximum has great significance on economic security design of electrical equipment of a wind power plant.

Description

technical field [0001] The invention relates to a simplified calculation method for the maximum value of the three-phase short-circuit current of a doubly-fed motor, belonging to the field of electrical economic safety analysis and design of a wind farm. Background technique [0002] With the development of power electronics technology, the doubly-fed wind generator (DFIG) has become the mainstream model of wind farms. During the low voltage ride-through process of double-fed wind turbines, crowbar resistance is often put into the rotor side, so the short-circuit current calculation of double-fed wind turbines should take into account the crowbar resistance. However, the calculation expression of the three-phase short-circuit current of the doubly-fed wind turbine considering the resistance value of the crowbar contains multiple parameters and is nonlinear, and involves complex complex calculations, which is inconvenient to apply in practical engineering. Contents of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 潘文霞张艺博刘明洋郭家圣杨刚李建成陈昕
Owner HOHAI UNIV
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