Synchronous Optimization Method for Very Low Speed Stability and Dynamics of Sensorless Induction Motor
A technology of induction motor and optimization method, which is applied to the control of generators, motor control, motor generator control, etc., and can solve the problems of low-speed stability and dynamics of sensorless induction motors, and the inability to balance stability and dynamics.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
specific Embodiment approach 1
[0034] Specific implementation mode 1: In this implementation mode, the specific process of the sensorless induction motor's extremely low-speed stability and dynamic synchronization optimization method is as follows:
[0035] The extremely low means that the operating frequency of the motor is less than 5 Hz (i.e. 10% of the rated speed);
[0036] Step 1: Select the stator current and rotor flux linkage as the state quantities, and the mathematical model of the induction motor is:
[0037]
[0038] Among them: p is the derivative operator, is the stator current, is the rotor flux linkage, is the motor input voltage, A 11 , A 12 , A 21 , A 22 are state matrix coefficients; b 1 is the coefficient of the voltage term coefficient matrix;
[0039] Based on the mathematical model of the induction motor, the mathematical model of the full-order observer of the induction motor is derived;
[0040] Step 2: According to the mathematical model (formula 1) and the observer...
specific Embodiment approach 2
[0043] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the state matrix coefficient A in the step one 11 , A 12 , A 21 , A 22 , and the voltage term coefficient matrix coefficient b 1 The expression is:
[0044]
[0045]
[0046] Where: σ is the leakage inductance coefficient, ω e is the synchronous speed, I is the real part matrix, J is the imaginary part matrix, R s is the induction motor stator resistance, R r is the induction motor rotor resistance, L s is the induction motor stator inductance, L r is the induction motor rotor inductance, L m is the induction motor mutual inductance, T r is the induction motor rotor time constant, ω r is the rotor speed of the induction motor.
[0047] Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0048] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the step 1, based on the mathematical model of the induction motor, the mathematical model of the full-order observer of the induction motor is derived; the specific process is:
[0049]
[0050] Among them: "^" represents the observation value, for A 11 observation value, for A 12 observation value, for A 21 observation value, for A 22 observation value, for observation value, for The observed value of g i is the feedback matrix coefficient, i=1,2,3,4, is the stator current error, i sd is the d-axis stator current, i sq is the q-axis stator current, for i sd observation value, for i sq observation value.
[0051] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More