Construction method of high-precision asynchronous motor system state model and asynchronous motor state detection method

A technology for asynchronous motors and system status, which is applied in the direction of motor generator testing, measuring electricity, and measuring devices. It can solve the problems of inaccurate and low-precision asynchronous motor status detection, and achieve the effect of improving the accuracy of status monitoring and reducing sensitivity

CN111208425BActive Publication Date: 2022-02-18ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-02-18

Smart Images

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

Abstract

The invention discloses a construction method of a high-precision asynchronous motor system state model based on a weak sensitive rank Kalman filter and a state detection method of an asynchronous motor, aiming to solve the technical problems of inaccurate and low precision detection of asynchronous motor states in the prior art . The present invention uses the weak sensitive optimal control method to solve the uncertainty of the parameters in the asynchronous motor system, and combines the mean square error cost function of RKF and the weak sensitive cost function through the sensitivity weight coefficient to form a new cost function, and then The optimal gain of weakly sensitive rank Kalman filter is obtained by minimizing the cost function, which reduces the sensitivity of state estimation to uncertain parameters in asynchronous motor system and improves the accuracy of state monitoring.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of asynchronous motor state detection, in particular to a method for constructing a state model of a high-precision asynchronous motor system based on weakly sensitive rank Kalman filtering and a method for detecting the state of an asynchronous motor. Background technique

[0002] Asynchronous motors have the advantages of simple structure, sturdy and durable, reliable operation, high operating efficiency, etc., and have received extensive attention in the fields of theoretical research and practical applications. It is widely used in the fields of industrial production and agricultural production.

[0003] Since the flux linkage and speed are not easy to measure, the current detection method for the asynchronous motor AC speed control system is to indirectly detect the asynchronous motor AC speed control system by detecting the easily measurable physical quantities such as the voltage and current at the st...

Examples

Embodiment

[0122] Embodiment: A state detection method of asynchronous motor based on weak sensitive rank Kalman filter

[0123] The detection method includes the no-load starting process of the asynchronous motor and the three-phase short-circuit fault and its recovery process. For its flow chart see figure 1 , the schematic diagram of weakly sensitive rank Kalman filter see figure 2 .

[0124] (1) The detection steps of the no-load starting state of the asynchronous motor are as follows:

[0125] Step 1: In the asynchronous motor system, take the state vector x=[x 1 ,x 2 ,x 3 ,x 4 ,x 5 ] T , then its state equation is:

[0126]

[0127] where x 1 and x 2 is the stator current, x 3 and x 4 is the rotor flux linkage, x 5 is the angular velocity; J is the rotor inertia; p n is the pole logarithm; u 1 and u 2 is the stator voltage control input; c=[c 1 c 2 ], is an uncertain parameter vector, c 1 and c 2 are stator resistance and rotor resistance respectively; w i...