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Abnormal voltage ride-through power supply of frequency converter

An abnormal voltage, inverter technology, applied in emergency power supply arrangements, electrical components, circuit devices, etc., can solve problems such as inverter shutdown, abnormality, trigger protection working status, etc., to achieve the effect of maintaining constant DC voltage

Active Publication Date: 2014-06-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above problems existing in the prior art, the present invention proposes a frequency converter abnormal voltage ride-through power supply, which is used to solve the abnormal voltage of the grid AC power supply voltage and the entire recovery process, the frequency converter stops, triggers protection or abnormal working status and so on

Method used

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Embodiment 1

[0020] Embodiment 1: The abnormal voltage ride-through power supply of the inverter is composed of three parts: rectifier circuit 1, a three-phase full-bridge uncontrolled rectifier composed of diode modules; buck-boost circuit 2, composed of reactors, capacitors, IGBTs, and freewheeling diodes DC / DCCUK buck-boost module; bypass circuit 3, a three-phase bypass circuit composed of three-phase static switches.

[0021] The rectification circuit 1 adopts a three-phase uncontrolled rectification circuit structure, which converts the input three-phase AC power into DC power and outputs it to the DC bus support capacitor. This part adopts a full-wave uncontrolled rectification circuit, and the uncontrolled rectification bridge is composed of diode modules. , which rectifies and converts the AC power input from the grid into DC, and stores it on the rectified DC capacitor C1 connected to its DC side;

[0022] DC buck-boost circuit 2 adopts CUK buck-boost circuit topology, including t...

Embodiment 2

[0026] Embodiment 2: In addition to the rectification circuit 1, buck-boost circuit 2, and bypass circuit 3 described in Embodiment 1, the inverter abnormal voltage ride-through power supply of this application further includes two components of an uninterruptible power supply (UPS) and a transformer. The secondary power output circuit 4 is used to provide one or more AC control power supplies. The UPS input end is connected to the grid three-phase AC power supply, and its output end is connected to the transformer. The UPS obtains energy from the power system to charge the internal battery. When the system voltage drops, the battery can ensure the normal AC output of the UPS. . The transformer can transform the 220V AC single-phase voltage output by the UPS into 110V or 380V voltage and send it out.

Embodiment 3

[0027] Embodiment 3: In Embodiment 3, in addition to the parts of Embodiment 1 and / or 2, the inverter abnormal voltage ride-through power supply of the present application may further include a control circuit 5 integrated inside the inverter abnormal voltage ride-through power supply, The control control circuit 5 includes a signal acquisition module, a power grid voltage monitoring module, and an automatic control module of a buck-boost circuit. The signal acquisition module converts the voltage and current signals measured by the power circuit into signals that the control circuit can receive. The grid voltage is connected to the grid voltage monitoring module through the signal acquisition circuit. The grid voltage monitoring module collects the three-phase voltage of the grid, and calculates the positive sequence component of the three-phase voltage vector of the power system grid in real time through the method of coordinate transformation, and uses the voltage vector Th...

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Abstract

The invention discloses an abnormal voltage ride-through power supply of a frequency converter. The power supply disclosed by the invention mainly consists of three parts, namely a bypass circuit, a rectification circuit and a buck-boost circuit, wherein the bypass circuit adopts a three-phase static switch, the rectification circuit is in a three-phase uncontrolled rectification circuit structure, and the buck-boost circuit is of DCDC (Direct Current-Direct Current) conversion. The abnormal voltage ride-through power supply of the frequency converter adopts a control mode that the bypass circuit is used in normal times and an action is done when an alternating current voltage is broke down. When the system voltage drops to a certain degree, the buck-boost circuit is placed in service to perform voltage boost control so as to keep the output voltage of the ride-through power supply to be constant, and when the system voltage is raised to a certain degree, the abnormal voltage ride-through power supply of the frequency converter blocks the bypass circuit, meanwhile, the buck-boost circuit is placed in service to perform voltage buck control so as to keep the output direct current voltage to be constant. When the system voltage is abnormal, the ride-through power supply outputs the stable direct current voltage to ensure that the frequency converter is not in halt all the time, the output speed, torque and power of a driving motor are not changed.

Description

technical field [0001] The invention belongs to the technical field of power supplies and frequency converters, and in particular relates to a frequency converter abnormal voltage ride-through power supply, which is suitable for various load units including frequency converters that can be connected to DC power sources. Background technique [0002] As a high-precision power control device, the frequency converter has been widely used in various fields of industrial production. It mainly realizes industrial applications by controlling the motor speed, torque and power. The inverter generally adopts AC power input, which is converted into DC power after internal rectification, and then inverts the DC power to realize the control of the motor. When the frequency converter performs internal inverter, the internal DC bus voltage must be maintained within a certain range. Too low DC bus voltage cannot guarantee the normal operation of the inverter and will trigger undervoltage pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/453H02J9/04
Inventor 杨刚张涛刘树操丰梅王皆庆王晓宇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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