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Motor driving control system and control method thereof

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

Active Publication Date: 2016-04-06
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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  • Motor driving control system and control method thereof
  • Motor driving control system and control method thereof
  • Motor driving 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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PUM

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Abstract

The invention discloses a motor driving control system. The system comprises a DC-DC converter control part and an inverter control part, wherein the inverter control part comprises a speed controller, a current controller and an inverter pulse width modulator (PWM) which are sequentially connected, the inverter control part also comprises a switching frequency calculation module, the switching frequency calculation module is used for calculating switching frequency information transmitted to the inverter PWM, the inverter PWM is used for outputting a PWM signal for controlling an inverter, and the DC-DC converter control part comprises a DC voltage calculation module and a DC voltage controller which are sequentially connected. According to the motor driving control system disclosed by the invention, the switching loss at a low speed is one fourth of that of the traditional system, other power loss of the system is basically kept unchanged, and the total loss of the system can be reduced by 20-40% after the switching loss is added to the other power loss.

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 Applications(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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