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
CN106778041AInactive Publication Date: 2017-05-31HOHAI UNIV
6 Cites 13 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
HOHAI UNIV
Publication Date
2017-05-31
Estimated Expiration
Not applicable ยท inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More