Vector control method, system and device for frequency converter

A technology of frequency converter control and vector control, which is applied in vector control systems, control systems, and control of electromechanical transmission devices, etc. It can solve problems such as large current, large motor input current, and affecting bus voltage utilization.

Inactive Publication Date: 2019-04-05
SHENZHEN INVT ELECTRIC
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  • Application Information

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Problems solved by technology

On the one hand, the voltage drop of the current on the inductor is too large, which affects the utilization rate of the bus voltage, and the output voltage of the inverter needs to be increased to compensate for the influence of the voltage drop on the inductor; on the other hand, the

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  • Vector control method, system and device for frequency converter
  • Vector control method, system and device for frequency converter
  • Vector control method, system and device for frequency converter

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Embodiment Construction

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work all belong to the protection scope of the present invention.

[0051] The embodiment of the present invention discloses a vector control method for a frequency converter, which is applied to a frequency converter that outputs electric energy to a motor M through an LC output filter, see figure 1 shown, including:

[0052] S1: Obtain the output current of the inverter;

[0053] S2: Obtain the compensation current value corresponding to the current of the filter capacitor of the LC output filter according to the freq...

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Abstract

The invention discloses a vector control method for a frequency converter, applied to the frequency converter that outputs electric energy to a motor through an LC output filter. The method comprisesthe following steps: obtaining an output current of the frequency converter; obtaining a compensation current value corresponding to the current of a filter capacitor according to the output current of the frequency converter, electrical parameters of the LC output filter, and the reference voltage of the frequency converter; obtaining a control parameter of the frequency converter according to the compensation current value; and controls the frequency converter by using the control parameter of the frequency converter. By using the compensation current value obtained by the output current ofthe frequency converter, the electrical parameters of the LC output filter and the reference voltage of the frequency converter, the control parameters of the frequency converter are obtained, therebycontrolling the frequency converter to output a relatively ideal current, adjusting the reactive current output by the frequency inverter, and reducing the output voltage of the inverter, so as to reduce the input current of the motor and reduce the loss of the motor. The application also discloses a vector control system and device for a frequency converter.

Description

technical field [0001] The invention relates to the technical field of electrical equipment control, in particular to a vector control method, system and device for a frequency converter. Background technique [0002] With the development of new energy technology, energy-saving technology, high-end equipment manufacturing and other technologies, the application of high-speed centrifuges and air compressors is becoming more and more extensive, and the requirements for the output frequency of inverters are getting higher and higher. However, the frequency converter is limited by the switching frequency of the power module. When the output power is used to directly drive the motor, the harmonics of the motor current are very large, and the motor generates serious heat, which seriously affects the performance and service life of the motor. [0003] In order to reduce the current harmonics of the motor, an LC output filter is usually connected in series between the inverter and t...

Claims

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Application Information

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IPC IPC(8): H02P21/22H02P27/12H02P29/50
CPCH02P21/22H02P27/12H02P29/50
Inventor 沈文王二峰吴轩钦
Owner SHENZHEN INVT ELECTRIC
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