Rotor position and rotating speed detection method based on counter potential open-loop estimation

A rotor position and rotational speed detection technology, applied in the direction of control of electromechanical transmission, electronic commutation motor control, electrical components, etc., can solve the problem that the mechanical bearing capacity and response capacity of the speed sensor cannot meet the requirements of the micro gas turbine power generation system, increase the axial length and Problems such as moment of inertia and reduced system reliability, to achieve accurate speed and position estimation signals, convenient phase compensation, and good filtering effects

Inactive Publication Date: 2020-04-10
BEIJING POWER MACHINERY INST
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Problems solved by technology

Since the system speed is as high as 90,000r / min, the mechanical tolerance and response capabilities of commonly used position and speed sensors are difficult to meet the needs of micro gas turbine power generation systems, and there are difficulties in mechanical installation, increasing axial length and moment of inertia, and reducing system reliability. question

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  • Rotor position and rotating speed detection method based on counter potential open-loop estimation
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  • Rotor position and rotating speed detection method based on counter potential open-loop estimation

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Embodiment Construction

[0052] The present invention will be described in detail below with reference to the drawings and embodiments.

[0053] The present invention provides a method for detecting rotor position and speed based on open loop estimation of back EMF. The open loop estimation method based on back EMF uses the back EMF generated by the permanent magnetic field of the rotor in the stator winding during the rotation of the motor to estimate the rotor of the motor Position and speed. As shown in formula (1) and formula (2):

[0054]

[0055]

[0056] Where u α With u β , I α With i β , E α With e β Respectively represent the voltage, current and back EMF in the static coordinate system αβ.

[0057] The implementation steps of the present invention are as follows:

[0058] Step 1: Introduce a linear tracking differentiator to preprocess the winding current to suppress noise

[0059] For high-speed permanent magnet synchronous starter generators, since the electromagnetic time constant is small and t...

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Abstract

The invention discloses a rotor position and rotating speed detection method based on counter potential open-loop estimation, and belongs to the technical field of closed cycle power generation. The method comprises the following implementation steps: firstly, a linear tracking differentiator is introduced to preprocess winding current to suppress noise, then a variable parameter low-pass filter is adopted to filter back potential of a motor, delay of PWM sampling is compensated at a high rotating speed, and finally, a dead zone compensation unit is introduced to compensate voltage waveform distortion caused by an inverter dead zone. Stable power generation of the power generator in the closed circulation system can be achieved, the motor body does not need to be provided with a position sensor, and the reliability of the system is improved.

Description

Technical field [0001] The present invention relates to the technical field of closed-cycle power generation, in particular to a closed-cycle power generation system, where a motor works under stable control under high-speed power generation conditions. Background technique [0002] The closed-cycle power generation system is a special turbine power generation technology in which working fluids repeatedly participate in cycle power generation. There is only energy exchange with the outside world, no material exchange, so it can be used in deep space, deep sea and other special environmental conditions without air. It is a small turbine power development. New direction. [0003] The closed-cycle power generation system consists of figure 1 As shown, the heat source heats the gas in the pipeline to directly drive the engine turbine to perform work. The hot gas after the engine turbine performs work is cooled by the cooler and enters the intake end of the engine to participate in the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P6/182
CPCH02P6/182H02P21/18
Inventor 马立丽马同玲朱明星聂聆聪丁祎明
Owner BEIJING POWER MACHINERY INST
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