Parallel EPLL-based pulsating high frequency signal injection method signal extraction system and strategy

A pulse-vibrated high-frequency signal and signal extraction technology, applied in control systems, vector control systems, control generators, etc., can solve problems such as amplitude errors, system complexity, and phase offsets

Inactive Publication Date: 2017-10-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The traditional signal extraction scheme is to modulate the output signal amplitude through the designed band-pass and low-pass filters. Due to the existence of band-pass and low-pass filters in the extraction scheme, amplitude er

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  • Parallel EPLL-based pulsating high frequency signal injection method signal extraction system and strategy
  • Parallel EPLL-based pulsating high frequency signal injection method signal extraction system and strategy
  • Parallel EPLL-based pulsating high frequency signal injection method signal extraction system and strategy

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Embodiment Construction

[0076] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only for explaining the present invention, and are not intended to limit the scope of the present invention.

[0077] The invention discloses a signal extraction system based on a parallel EPLL pulse vibration high-frequency signal injection method, figure 1 It is a system structure block diagram of the present invention, including: power supply circuit, rectifier, inverter, motor, motor load module, motor current acquisition module, Clark transformation module, Park transformation module, parallel EPLL signal analysis module, high-frequency signal PI module, Integral processing module, direct axis positive direction judgment module, angle correction module, speed error module, speed PI module, d-axis current error module, d-axis current PI module, q-axis current error module, q-axis current PI module, high-frequency signal I...

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Abstract

The invention discloses a parallel EPLL-based pulsating high frequency signal injection method signal extraction system and strategy comprising the following steps: carrying out Clark and Park transformation for three-phase current, thus obtaining d and q shaft currents; improving an EPLL strategy so as to extract the amplitude of the q shaft current containing a rotor position signal and the q shaft high frequency signal amplitude, thus obtaining a pre-estimate rotating speed and angle, and q shaft second harmonic signal positive negative value correction angles; adjusting PI of DC signals so as to obtain d and q shaft real voltages; carrying out Park inverse transformation for the d and q shaft real voltages so as to obtain [alpha] and [beta] shaft voltages; modulating an inverter so as to control a motor. The system and strategy can realize non-position operation of the motor at a low speed, can obtain the pre-estimate rotor position signal, can improve the filter delay problems on the basis of the pulsating high frequency signal injection method, can simplify the signal extraction process, and thus providing response speed and signal extraction precision superiority.

Description

technical field [0001] The invention belongs to the technical field of position sensorless control, and more specifically relates to a signal extraction improvement strategy based on a pulse vibration high-frequency signal injection method. Background technique [0002] Permanent magnet synchronous motors show advantages in the field of speed regulation due to their high efficiency, small size, easy control, remarkable long life and reliability. In occasions requiring high control precision and high reliability, such as ship propulsion, CNC machine tools, Many fields such as locomotive traction, electric vehicles and household appliances have been widely used, and have become research hotspots of scholars from all over the world. [0003] Taking electric tools as an example, their working environment and installation requirements are relatively high, and traditional mechanical sensors are difficult to meet their processing accuracy and work requirements, so positionless tech...

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Application Information

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IPC IPC(8): H02P21/18H02P6/18
CPCH02P6/183H02P21/18
Inventor 储剑波何洋曹广超
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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