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Bus voltage control method for driving system of permanent magnet synchronous motor without electrolytic capacitor

A permanent magnet synchronous motor and bus voltage control technology, which is applied in motor generator control, electronic commutation motor control, AC motor control, etc., can solve the problems of bus side voltage overvoltage and inability to adjust the controller on-line, and improve the The effect of dynamic performance, avoiding power density reduction, and optimizing motor performance

Active Publication Date: 2021-11-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the existing non-electrolytic capacitor permanent magnet synchronous motor drive system decelerates during the regenerative braking process, because the control parameters of the controller cannot be adjusted online, resulting in overvoltage on the bus side voltage, the present invention provides a permanent magnet synchronous motor without electrolytic capacitors. Bus voltage control method for magnetic synchronous motor drive system

Method used

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  • Bus voltage control method for driving system of permanent magnet synchronous motor without electrolytic capacitor
  • Bus voltage control method for driving system of permanent magnet synchronous motor without electrolytic capacitor
  • Bus voltage control method for driving system of permanent magnet synchronous motor without electrolytic capacitor

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specific Embodiment approach 1

[0036] DETAILED DESCRIPTION I. binding figure 1 , The present invention provides a method for controlling a bus voltage electrolytic capacitor permanent magnet synchronous motor drive, comprising,

[0037] The voltage regulator is provided on the bus voltage u dc Bus voltage with the limit value u dc-max Bus voltage difference is adjusted to achieve a given q-axis current It is adjusted to reduce the deceleration rate of the motor;

[0038] The voltage regulator via real-time adjustment of the scale factor K P Adjustment to achieve the bus voltage difference, the scale factor K P Obtaining method comprising:

[0039] Given the current q-axis current And collecting the obtained q-axis current actual current i q Q-axis current obtained by calculation standard

[0040] The q-axis current standard Subtracting a given q-axis current The absolute value of the difference obtained by a step size variation of the proportionality coefficient n ΔK p The absolute value of the q-axis curre...

specific Embodiment

[0065] The method of the present invention to verify the validity of the following:

[0066] Validate the anti-over voltage control method proposed in the present invention, no electrolytic capacitors permanent magnet synchronous motor drive system internet. Experimental parameters platform to: grid voltage 380V, grid frequency 50Hz, DC bus capacitor is a film capacitor, capacitance value of 30 F, a direct axis inductance 7.5mH, cross-axis inductance 17.2mH, rotor flux 0.5Wb, rotor pole pairs is 3, the rated power of 11kW, a rated speed of 1500r / min, the stator resistance is 0.275Ω.

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Abstract

The invention discloses a bus voltage control method for a permanent magnet synchronous motor driving system without an electrolytic capacitor, and belongs to the technical field of motor control. The invention aims to solve the problem that the voltage of a bus side is overvoltage due to the fact that control parameters of a controller cannot be adjusted on line when the speed of an existing non-electrolytic capacitor permanent magnet synchronous motor driving system is reduced in the regenerative braking process. The method comprises the following steps: setting a voltage regulator to adjust a bus voltage difference value between a bus voltage udc and a bus voltage limit value udc-max so as to adjust a given q-axis current to reduce the speed reduction rate of a motor; and enabling the voltage regulator to adjust the bus voltage difference value through a proportionality coefficient KP which is adjusted in real time. The method for obtaining the proportionality coefficient KP comprises the following steps: calculating standard q-axis current to obtain an absolute value of a proportionality coefficient variation [delta]Kp, determining positive and negative values of the absolute value, integrating the proportionality coefficient variation [delta]Kp through an integration module, and adding the integrated value with a proportionality coefficient initial value Kp0 to obtain the proportionality coefficient KP. According to the invention, overvoltage prevention at the bus side can be realized.

Description

Technical field [0001] The present invention relates to non-electrolytic capacitors permanent magnet synchronous motor drive system link voltage control method, motor control belonging to the technical field. Background technique [0002] Phase input PMSM electrolytic capacitor bus voltage to achieve a smooth and stable large-capacity electrolytic capacitors, electrolytic capacitors and short lifetime, limiting the life of the drive system. In addition to extend the life of the system motor drive system, but also to achieve low total harmonic distortion (THD) in the grid current thin film capacitor application. However, the use of the film resulting in reduced bus capacitance value of the capacitor, which makes the regenerative braking system for electrolytic capacitors without facing problems such as over-voltage bus. [0003] At present, no system for driving electrolytic capacitor bus voltage overvoltage condition exists hardware and software control solution, respectively. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/13H02P21/22H02P25/024
CPCH02P21/0003H02P21/13H02P21/22H02P25/024
Inventor 王高林任泽坤丁大尉张国强徐殿国
Owner HARBIN INST OF TECH