Simplified design method of state observer for reconstructing torque signal of asynchronous motor
A technology for asynchronous motors and state observers, applied in motor generator control, electromechanical brake control, electronic commutation motor control, etc., can solve problems such as complex pole configuration, and achieve simple design principles, simple solutions, and easy implementation
Active Publication Date: 2017-02-15
HOHAI UNIV +1
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Problems solved by technology
The torque reconstruction of the asynchronous motor can be realized by observing the flux linkage of the asynchronous motor, and the asynchronous motor is a high-order, nonlinear, strongly coupled multivariable system, and its approximately linearized state equation is fourth-order, and its state Pole configuration in observer design is complex
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[0017] Control figure 1 , ,
[0018] formula Where u is the input, y is the output, For state observation, For output observation, State observation The differential of, A is the system matrix, B is the input matrix, C is the output matrix, and K is the feedback gain matrix.
[0019] The specific implementation of the simplified design method for reconstructing the state observer of the asynchronous motor torque signal is divided into the following five steps:
[0020] 1. Establish the state space model of the asynchronous motor
[0021] In the asynchronous motor two-phase static coordinate system ( αβ Coordinate system), select the stator current of the asynchronous motor i α 、 i β And stator flux linkage ψ α , Ψ β Is the state variable, the stator voltage u α 、 u β Is the input and the stator current is the output. The state space model is established.
[0022] Equation of state:
[0023] (1)
[0024] among them
[0025] Output equation:
[0026] (2)
[0027] Electromagnet...
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The invention discloses a state observer simplified design method for reconstructing the torque signal of an asynchronous motor. According to the adopted technical scheme, the method comprises the following steps: firstly, establishing a state-space model of the asynchronous motor, and writing a system matrix into a plural form; secondary, determining the structure of an asynchronous motor state observer, configuring the pole of the state observer, and evaluating the gain matrix K of the observer; lastly, reconstructing the electromagnetic torque according to observed stator flux linkage and measured stator current. The state observer is designed in the plural form, thereby greatly lowering the difficulty and calculated amount in pole configuration of the state observer. The method is suitable for designing the state observer of the asynchronous motor in order to realize torque observation of the asynchronous motor. The method is simple in design principle, is easy to implement, and has a high application value.
Description
Technical field [0001] The invention relates to a design method of a state observer for reconstructing a torque signal of an asynchronous motor. Background technique [0002] Since the power factor of a large asynchronous motor changes rapidly in the later stage of the starting process, the rotor speed often exceeds the synchronous speed, and a steady-state operating point can be reached after a process of attenuation and oscillation. The smaller the load torque and moment of inertia of the motor, the more likely it is to oscillate. This phenomenon is called "exceeding standards." For the soft starter adopting current closed-loop control, the output of the regulator increases as the current decreases, and the control trigger angle is rapidly advanced to full voltage, which causes the motor output torque to overshoot and cause system oscillation. In the voltage ramp or current ramp control mode, the torque of the pump driving motor will generate excessive acceleration torque at t...
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IPC IPC(8): H02P21/13
Inventor 张杰王宏华徐周尹祥顺李军民
Owner HOHAI UNIV