An Implicit Trapezoidal Integral Electromagnetic Transient Modeling Method with Damping for Doubly-fed Asynchronous Motors

Abstract

The invention provides an implicit trapezoidal integral electromagnetic transient modeling method with damping of a doubly-fed asynchronous motor. (1). Starting from the three-phase circuit equation and the flux linkage equation, the circuit equation is obtained by Parker transformation, and the circuit equation is differentiated by using the implicit trapezoidal integration method with damping, and the Thevenin of the stator side and the rotor side of the doubly-fed asynchronous motor is obtained. Equivalent circuit; (2). Propose the interface method between the doubly-fed asynchronous motor and the external electromagnetic transient network, which is connected to the external network in the form of three-phase injection current source and accompanying admittance matrix on the stator side and the rotor side; (3) .Using the implicit trapezoidal integration method with damping to differentiate the rotor motion equation of the doubly-fed asynchronous motor, the rotational equation of the doubly-fed asynchronous motor with multiple masses is obtained, and the implicit damping of the doubly-fed asynchronous motor is realized through iterative calculation Trapezoidal integral modeling and computation. The method of the invention improves the electromagnetic transient simulation accuracy of the doubly-fed asynchronous motor model and enhances the stability of the model.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to a damped implicit trapezoidal integral electromagnetic transient modeling method of a doubly-fed asynchronous motor. Background technique [0002] Double-fed asynchronous motor is also called AC excitation motor, the stator is connected to 50Hz power frequency grid, and the rotor is connected to AC excitation power supply. With the adjustment of the frequency, amplitude and phase of the rotor excitation current by the AC excitation automatic control system, the double-fed asynchronous motor can The rotor speed can be adjusted to operate under different working conditions, while the output voltage and frequency of the stator can remain unchanged, and the operation mode is flexible. Double-fed means that there are two energy flow channels. Both the stator and the rotor of the double-fed asynchronous motor can exchange energy with the grid, realizing the two channels of ene...

AI Technical Summary

Problems solved by technology

This modeling method will cause numerical oscillation of the motor for some phenomena in the simulation application, and there are problems of poor accuracy and stability, and the simulation results are not ideal

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