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Inverter device for asynchronous motor with low voltage ride-through capability

A low-voltage ride-through and asynchronous motor technology, applied in the field of power systems and power electronics, can solve problems such as the inability to guarantee the speed and torque of asynchronous motors, affect production and safety, etc., to ensure reliable operation, prolong service life, and improve power quality Effect

Active Publication Date: 2011-12-21
NORTHEAST CHINA GRID +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above problems in the prior art, the low-voltage ride-through asynchronous motor inverter device proposed by this application solves the problem that the inverter triggers its own protection when the grid AC power supply voltage drops, and cannot guarantee the proper speed and torque of the asynchronous motor. production and safety issues

Method used

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  • Inverter device for asynchronous motor with low voltage ride-through capability
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  • Inverter device for asynchronous motor with low voltage ride-through capability

Examples

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Embodiment 1

[0021] Embodiment 1: The asynchronous motor inverter device with low voltage ride-through capability of the present application is composed of three parts: a rectifier circuit 1 , a boost circuit 2 and an IPM inverter bridge 3 .

[0022] The rectifier circuit 1 is a three-phase uncontrolled rectifier circuit structure; the boost circuit 2 is a DCDC boost mode, and its topology selects a BOOST boost circuit, and the BOOST circuit in the present invention adopts a triple BOOST mode; the inverter circuit 3 is composed of an IPM three-phase inverter Variable bridge composition.

[0023] The rectification circuit 1 is a three-phase full-bridge uncontrolled rectification part. This part adopts a full-wave uncontrolled rectification circuit. The uncontrolled rectifier bridge is composed of diode modules, which rectifies and converts the AC power input from the grid into DC power, and stores it on the rectified DC capacitor connected to its DC side;

[0024] The boost circuit 2 is pa...

Embodiment 2

[0027] Embodiment 2: In addition to including the rectifier circuit 1, boost circuit 2 and IPM inverter bridge 3 as described in Embodiment 1, the asynchronous motor inverter device with low voltage ride-through capability further includes an uninterruptible power supply UPS and a transformer , the input end of the UPS is connected to the three-phase power system, the UPS obtains energy from the power system, and charges the internal storage battery. When the system voltage drops, the storage battery can ensure the normal AC output of the UPS. The UPS output terminal of the uninterruptible power supply is connected to the transformer, and the transformer can convert the 220V AC single-phase voltage output by the UPS into 110V or 380V voltage and send it out.

Embodiment 3

[0028] Embodiment 3: In Embodiment 3, in addition to the technical solutions of Embodiment 1 and / or 2, the asynchronous motor inverter device with low voltage ride-through capability of the present application can further integrate the control circuit part 3 inside the inverter device .

[0029] The control circuit part 3 includes a grid voltage drop monitoring module and a boost circuit automatic control module. The control circuit part 3 further includes a signal preprocessing module. The signal preprocessing module converts the voltage and current signals measured by the power circuit into signals that the sampling board can receive. The power grid voltage passes through the signal preprocessing circuit, passes through the Hall voltage sensor, and connects to the power grid voltage monitoring module through the sampling board. The positive sequence component of the voltage vector is used to determine whether the voltage drop of the three-phase AC power supply of the power...

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Abstract

The invention discloses an asynchronous motor frequency converter device with low-voltage ride through capability. An alternating-direct-alternating mode is adopted for a frequency converter, namely, firstly converting a working frequency alternating power supply into a direct current power supply by a rectifier; and then converting the direct current power supply into an alternating power supplywith controllable voltage and frequency through an inversion link and providing the alternating power supply to an asynchronous motor. A diode rectification module in the inner part is switched in after the working frequency alternating power supply is switched in the frequency converter; the alternating current is converted into direct current; the output of a rectifier bridge is switched into aBOOST module; the output of the BOOST module is switched into the input of a DC / AC (direct current / alternating current) inverter module; and the output of the inverter module, serving as an alternating current supply, is directly supplied to the asynchronous motor. Under the normal condition, the BOOST module is not started, when the drop of the power grid voltage is detected, the BOOST module starts automatically, sufficient direct current voltage sources for the inversion link are ensured, and the stable operation of the asynchronous motor is ensured.

Description

technical field [0001] The invention belongs to the technical field of power system and power electronics, and is suitable for the control of various asynchronous motors, especially the control of sensitive loads with high requirements on grid voltage stability, and can realize uninterrupted power supply to the motors. Background technique [0002] Asynchronous motor drive inverters are widely used in various fields of industrial production to adjust the speed, torque and power of rotating loads. The asynchronous motor drives the input side of the inverter to connect to the AC grid, and its internal rectifier bridge converts the AC power of the grid into DC power, which is supplied to the inverter part of the inverter. Conventional asynchronous motor inverters will monitor the DC bus voltage. When the DC bus voltage is too low, the inverter will take corresponding protection actions and block the output of the inverter to ensure the safety of the inverter itself. [0003] W...

Claims

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Application Information

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IPC IPC(8): H02P27/06
Inventor 王钢贾伟郑怀国马新邵广惠李群金元郑安王绍民孙术文袁丁黄旭昊志琪薛成勇辛世奎张涛屠黎明刘树刘志超
Owner NORTHEAST CHINA GRID
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