A switch-type power grid commutation, rectification and feedback system and its control method

A switching type, grid technology, applied in the direction of AC power input conversion to DC power output, electrical components, single-network parallel feeding arrangement, etc. Simple control, avoid the effect of inverter subversion failure

Active Publication Date: 2022-01-14
BEIJING ARITIME INTELLIGENT CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the PWM modulation method, a large LC line filter needs to be added, the overall price is more expensive than the former two, and the control system is more complicated

Method used

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  • A switch-type power grid commutation, rectification and feedback system and its control method
  • A switch-type power grid commutation, rectification and feedback system and its control method
  • A switch-type power grid commutation, rectification and feedback system and its control method

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Embodiment Construction

[0068] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be further described in detail and in-depth below in conjunction with the accompanying drawings.

[0069] The invention provides a switch-type power grid commutation rectification feedback system, such as figure 1 As shown, including: power module and control module.

[0070] The control module includes: operation and panel display, signal acquisition and detection module, core processing module, host computer and I / O logic control module; the power module includes AC incoming line main circuit breaker and pre-charging circuit, incoming line reactor L1, AC / DC Current and voltage detection module, rectification and feedback sub-module AC / DC, DC bus and DC voltage transformer.

[0071] like figure 2 As shown, the main circuit breaker of AC incoming line includes: three-phase AC incoming line A, B, C and three-phase main circuit breaker...

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Abstract

The invention discloses a switch-type power grid commutation rectification feedback system and a control method thereof, which belong to the technical field of power electronic conversion, and specifically include a control module which mainly completes the trigger control of the IGBT power module and the feedback function from the DC bus to the power grid; wherein the signal The acquisition and detection module collects AC and DC voltages and currents, converts the coordinate system, and sends them to the power grid synchronous phase-locked loop model to track and calculate the synchronous phase-locked angle θss, and assign trigger pulses to the power module according to the trigger logic switch sector table ; The power module consists of 6 power modules to form a 3-phase full-bridge rectification feedback sub-module, each power module contains an IGBT turn-off device and a diode connected in parallel with it, and 6 diodes complete the conversion of three-phase AC voltage into DC voltage, 6 One IGBT can turn off the device to complete the DC bus feedback grid, and its opening and closing are synchronized with the grid; the present invention utilizes the DC bus voltage U DC Control to limit the reactive current and avoid the heating of the IGBT device caused by the feedback current at no-load.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion, and in particular relates to a switch-type power grid commutation, rectification and feedback system and a control method thereof. Background technique [0002] With the development of power electronic devices and converter technology, the technology of changing AC power to DC power has been developed rapidly in various industries of the national economy, especially in the fields of new energy, metallurgy and rail transit. [0003] Commonly used AC-DC rectification systems include diode rectification, thyristor semi-controlled rectification, active front end rectification AFE (Active Front End) of insulated gate bipolar transistor (IGBT or IGCT), also called pulse width modulation PWM rectification. [0004] The diode rectification system is an uncontrolled three-phase full-bridge rectification, which is simple in structure, economical and reliable in operation, but the energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M1/092H02J3/38
CPCH02M7/219H02M1/092H02J3/38
Inventor 许海涛姚福君郭艳兵吕少鹏薛士凡
Owner BEIJING ARITIME INTELLIGENT CONTROL
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