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A motor drive control system and control method thereof

A technology of motor drive control and control section, applied in control systems, AC motor control, electrical components, etc., and can solve problems such as switching loss

Active Publication Date: 2018-11-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At low modulation ratios, power electronic devices still have to bear the stress of full bus voltage and corresponding switching losses, and the fixed switching frequency in the full speed range will also bring unnecessary switching losses at low modulation ratios

Method used

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  • A motor drive control system and control method thereof
  • A motor drive control system and control method thereof
  • A motor drive control system and control method thereof

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0021] Such as figure 1 As shown, the structure of the motor drive system includes an energy storage battery 1 connected to a DC bus through a step-up DC-DC converter 2 . The DC bus mainly includes an energy storage capacitor 3 to smooth the DC bus voltage. The DC bus drives the load motor through a voltage source inverter. The motor drive system is an energy feedback system. When the load mo...

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Abstract

The invention discloses a motor drive control system, which comprises a DC-DC converter control part and an inverter control part, the inverter control part comprises a speed controller, a current controller and an inverter PWM which are connected in sequence, The inverter control part also includes a switching frequency calculation module, the switching frequency calculation module calculates the switching frequency information and transmits it to the inverter PWM, the inverter PWM outputs the PWM signal for controlling the inverter, and the DC-DC converter part includes a sequence The connected DC voltage calculation module and the DC voltage controller. According to the motor drive control system realized by the invention, the switching loss at low speed is 1 / 4 of that of the traditional system, and other power losses of the system remain basically unchanged. After adding, the total system loss can be reduced by 20% to 40%.

Description

technical field [0001] The invention belongs to the field of inverter-driven AC motors, and more specifically relates to an inverter control system with variable DC bus voltage and switching frequency and a control method thereof. Background technique [0002] With the development of power electronics and control technology, inverter-driven variable-frequency AC motors have become the main way in traffic traction. In hybrid and full electric vehicles, the energy storage battery is generally boosted to a fixed DC voltage by a step-up DC-DC converter, and then the load motor is driven by a three-phase inverter with pulse width modulation at a fixed switching frequency. Since the back electromotive force of the motor running at different speeds is different, the modulation ratio of the inverter will also be different. At low modulation ratios, power electronic devices still have to bear the stress of the full bus voltage and the corresponding switching losses, and the fixed sw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/08H02M7/48
CPCH02M7/48H02P27/085H02M1/0054Y02B70/10
Inventor 蒋栋
Owner HUAZHONG UNIV OF SCI & TECH
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