Implicit expression trapezoidal integral electromagnetic transient modeling method with damping of double-fed asynchronous motor

A doubly-fed asynchronous motor and trapezoidal integration technology, applied in the field of electric power, can solve problems such as poor accuracy and stability, unsatisfactory simulation results, and numerical oscillation of the motor

Active Publication Date: 2014-10-01
STATE GRID CORP OF CHINA +3
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Problems solved by technology

This modeling method will cause numerical oscillation of the motor for some phenomena in the simulation ap

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  • Implicit expression trapezoidal integral electromagnetic transient modeling method with damping of double-fed asynchronous motor
  • Implicit expression trapezoidal integral electromagnetic transient modeling method with damping of double-fed asynchronous motor
  • Implicit expression trapezoidal integral electromagnetic transient modeling method with damping of double-fed asynchronous motor

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[0070] The technical solution of the present invention will be described in detail below in conjunction with the drawings.

[0071] The invention provides a damped implicit trapezoidal integral electromagnetic transient modeling method for a doubly-fed asynchronous motor, which includes the following steps:

[0072] Step S1: Starting from the three-phase circuit equation and the flux equation, the circuit equation under the dq0 axis is obtained by Parker transformation, and the dq0 axis circuit equation after standardization is differentiated by using the damped implicit trapezoidal integration method to obtain The Thevenin equivalent circuit of the dq0 axis on the stator side and the rotor side of the doubly-fed asynchronous motor;

[0073] Step S2: Propose an 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 a stator-side and rotor-side three-phase injection curren...

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Abstract

The invention provides an implicit expression trapezoidal integral electromagnetic transient modeling method with damping of a double-fed asynchronous motor. The method comprises the steps of (1) starting from a three-phase circuit equation and a flux linkage equation, obtaining a circuit equation through park transformation, using the implicit expression trapezoid integration method with the damping for carrying out differencing on the circuit equation, and obtaining a thevenin equivalent circuit on the stator side and the rotor side of the double-fed asynchronous motor; (2) putting forward an interface method of the double-fed asynchronous motor and an external electromagnetic transient network, and connecting the double-fed asynchronous motor and the external electromagnetic transient network with an external network in a stator side and rotor side three-phase injection current source and an admittance matrix mode; (3) using the implicit expression trapezoid integration method with the damping for carrying out differencing on a rotor movement equation of the double-fed asynchronous motor to obtain a rotation equation of the double-fed asynchronous motor with multiple mass blocks, and achieving implicit expression trapezoidal integral electromagnetic transient modeling and calculation with damping of the double-fed asynchronous motor through iterative computations. According to the implicit expression trapezoidal integral electromagnetic transient modeling method with damping of the double-fed asynchronous motor, the electromagnetic transient simulation accuracy of the double-fed asynchronous motor model is improved, and the modeling stability is improved.

Description

Technical field [0001] The invention belongs to the field of electric power, and particularly 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 the 50 Hz power frequency grid, and the rotor is connected to the 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 The rotor speed can be adjusted to operate under different working conditions, while the stator output voltage and frequency can be maintained unchanged, and the operation mode is flexible. Double-fed means that there are two energy flow channels. Both the stator and rotor of the double-fed asynchronous motor can exchange energy with the power grid to realize the two channels of en...

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Application Information

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IPC IPC(8): H02P21/14
Inventor 林因胡晓波张星黄霆徐振华王峰刘子新刘敏彭红英江伟
Owner STATE GRID CORP OF CHINA
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