Apparatus and method for inverter control

A control method and inverter technology, applied in control systems, AC motor control, output power conversion devices, etc., can solve problems such as limited sampling frequency calculation time, reduced command followability, and reduced accuracy of system modeling , to achieve the effect of improving the followability and stability of the current command

Pending Publication Date: 2021-10-29
LS ELECTRIC CO LTD
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Problems solved by technology

[0003] On the other hand, in digital inverters, the sampling frequency is limited due to problems such as the operation time of the controller and the heat generation of power devices
Therefore, in the case where the sampling frequency of the inverter is not sufficiently higher than the rotation frequency of the motor, there is a problem that the current control performance deteriorates or becomes unstable, which is a problem in a large-capacity system or an ultra-high-speed operation system using a permanent magnet motor especially evident in
[0004] That is, in a motor control system whose sampling period is not sufficiently small, the modeling accuracy of the system decreases, so there is a problem that the inverter system's followability to commands is reduced, and the stable operating range is limited.

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  • Apparatus and method for inverter control
  • Apparatus and method for inverter control
  • Apparatus and method for inverter control

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[0042] In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms, and various changes may be made. However, the description of this embodiment is intended to provide a complete disclosure of the present invention and fully disclose the scope of the present invention to those having ordinary skill in the art to which the present invention pertains. In the drawings, the size of the constituent elements is exaggerated for convenience of description, and the proportions of the constituent elements may be exaggerated or reduced.

[0043] The terms "first", "second", etc. may be used to describe various constituent elements, but these constituent elements should not be limited to the above terms. The above terms may only be used to...

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Abstract

An apparatus and a method for inverter control are disclosed. A method according to an embodiment of the present invention comprises: discretizing, in a continuous time domain, a voltage equation for a motor in a stationary coordinate system in which a zero-order hold and time delay is reflected; and determining a voltage equation for the motor in a synchronous coordinate system in a discrete time domain by reflecting the position and speed of a rotor of the motor.

Description

technical field [0001] The invention relates to an inverter control device and method. Background technique [0002] In AC motor systems, with the development of microprocessors and various sensors, etc., digital inverters have become increasingly popular. At this time, in the case of controlling the instantaneous torque of the motor, the magnetic flux reference control is mainly used, that is, the so-called vector control, and it can be said that the performance of the vector control depends on the current control performance of the digital inverter. [0003] On the other hand, in digital inverters, the sampling frequency is limited due to problems such as the operation time of the controller and the heat generation of the power devices. Therefore, in the case where the sampling frequency of the inverter is not sufficiently higher than the rotation frequency of the motor, there is a problem that the current control performance deteriorates or becomes unstable, which is a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387
CPCH02M7/53873H02M7/5395H02M1/12H02P23/14H02P25/026H02P27/08
Inventor 曹秉极
Owner LS ELECTRIC CO LTD
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