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A multi-parallel inverter motor speed regulation system and its control method

A control method and motor speed regulation technology, applied in the fields of power electronics, motor control, and power systems, can solve problems such as difficult modular expansion, achieve enhanced electromagnetic anti-interference ability, reduce cost and volume, and reduce high frequency of motors noise effect

Active Publication Date: 2015-09-16
SOUTHEAST UNIV
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Problems solved by technology

[0005] In view of the shortcomings of the current parallel inverter motor speed control system that is not easy to be modularized and expanded, and the need for improvement in the traditional modulation technology and control strategy of parallel inverters, this invention proposes a multi-parallel inverter based on phase-shift random pulse width modulation Motor speed control system

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  • A multi-parallel inverter motor speed regulation system and its control method
  • A multi-parallel inverter motor speed regulation system and its control method
  • A multi-parallel inverter motor speed regulation system and its control method

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Embodiment Construction

[0023] The technical scheme and working principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, taking three inverter modules connected in parallel as an example, the parallel inverter feeding motor speed control system is composed of inverter module 1.3, inverter module 1.4, and inverter module 1.5 in parallel, and the three inverters The DC side of the modules 1.3, 1.4, 1.5 is directly connected in parallel with the DC power supply 1.1 with the DC bus capacitor 1.2 connected in parallel, and the AC side is respectively connected in series with smoothing reactors 1.6, 1.7, 1.8 in parallel to drive the motor load 1.9. The topology of a single inverter module is a three-phase full-bridge circuit composed of six IGBTs with anti-parallel diodes. The present invention increases the output current of the AC side by connecting multiple inverter modules in parallel,...

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Abstract

The invention discloses a multi-parallel inverter motor speed regulating system and a control method of the multi-parallel inverter motor speed regulating system. The system is formed by connecting multiple inverter modules in parallel. The direct current sides of multiple inverter sub modules are directly connected with a direct current power supply with a direct current bus capacitor in parallel. The alternating current sides of the multiple inverter sub modules are connected with multiple sets of smoothing reactors respectively in series and then directly connected in parallel to drive an alternating current motor. By the adoption of the structure, modularization expansion of the motor speed regulating system is easily conducted, and the fault-tolerance performance of the motor speed regulating system is enhanced. By means of a random SVPWM method based on carrier phase shifting, switching frequency of parallel inverters is equivalently improved, switching subharmonic energy within narrow frequency bands is equalized, the harmonic performance of output currents of the parallel inverters is improved, and electromagnetic interference resistance of the motor speed regulating system is enhanced. By the adoption of a space vector synthetic technology for dynamically allocating SVPWM zero vectors, zero-sequence circulating currents between the parallel inverter modules are effectively eliminated, and normal operation of the system is guaranteed.

Description

technical field [0001] The invention relates to an AC motor speed regulation system and a control method thereof, which are widely used in high-power AC motor speed regulation and electric energy conversion, and belong to the fields of power system, power electronics and motor control. Background technique [0002] At present, the research on the AC motor speed control system is mainly on the topological structure of the conversion circuit and the power electronic control strategy. small. [0003] In order to meet the increasing requirements of the capacity of the motor drive system, parallel three-phase inverters are used to increase the capacity of the motor speed control system. Parallel connection methods include: (1) The DC side is powered by multiple power sources independently, and the AC side is directly connected in parallel through a smoothing reactor; (2) The DC side is directly connected in parallel with a power supply, and the AC side is connected in parallel t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/08H02P21/00
Inventor 王政郑杨陈健程明
Owner SOUTHEAST UNIV
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