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PMSM sensorless vector control system and method

A vector control and sensor technology, applied to vector control systems, control systems, control generators, etc., can solve the problems of phase lag and inability to guarantee convergence to zero, etc., to achieve simple control, reduce cost and size, and improve reliability Effect

Inactive Publication Date: 2019-01-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Using the low-pass filter method to eliminate chattering will cause phase lag; while the boundary layer method cannot guarantee to converge to zero within the boundary range

Method used

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  • PMSM sensorless vector control system and method
  • PMSM sensorless vector control system and method
  • PMSM sensorless vector control system and method

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Embodiment Construction

[0025] to combine figure 1 , figure 2 , a PMSM position sensorless vector control system, comprising a Clark transformation module, a Park transformation module, a Park inverse transformation module, a pulse width modulation module, an inverter module, a sliding mode observer, a first comparator, a second comparator, A third comparator, a speed regulator and a current regulator; where,

[0026] The input end of the Clark transformation module is connected to the three-phase stator current output end of the permanent magnet synchronous motor, and the output end of the Clark transformation module is connected to the input end of the Park transformation module and the input end of the sliding mode observer;

[0027] The d-axis current output terminal of the Park conversion module is connected to the feedback input terminal of the first comparator, and the output terminal of the first comparator is connected to the d-axis voltage input terminal of the Park inverse conversion mod...

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Abstract

A PMSM sensorless vector control system and method is provided. The system includes a Clark transform module, a Park transform module, a Park inverse transform module, a pulse width modulation module,an inverter module, a sliding mode observer, a first comparator, a second comparator, a third comparator, a speed regulator and a current regulator. A sliding mode observer is used to replace a traditional mechanical sensor to detect the position and speed of a PMSM, the cost and size of PMSM control system are reduced, A new type of second-order sliding mode observer is designed by using Lyapunov function method. The second-order sliding mode observer eliminates the chattering of the system without low-pass filter, and obtains smooth back electromotive force signal for rotor position and speed estimation, which improves the observation accuracy and system robustness.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motor control, in particular to a PMSM position sensorless vector control system and method. Background technique [0002] The permanent magnet synchronous motor has the advantages of high power density, high efficiency, high reliability, simple structure, small size, and light weight. Due to the reduction in the price of permanent magnet materials in recent years, it has also become the first choice for energy-saving motor systems. However, the permanent magnet synchronous motor is a multivariable, strongly coupled nonlinear system. In its control system design, there are many factors such as current coupling, system saturation, parameter perturbation and external disturbance, which directly affect the permanent magnet synchronous motor. system performance. [0003] In the permanent magnet synchronous motor vector control system, the position information of the rotor plays a vital rol...

Claims

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Application Information

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IPC IPC(8): H02P21/28H02P21/13
CPCH02P21/13H02P21/28
Inventor 沈静卢烨干淑阳于航邵敏峰
Owner NANJING UNIV OF SCI & TECH
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