Switching type power grid commutation rectification feedback system and control method thereof

A switch type and power grid technology, applied in the direction of converting AC power input to DC power output, electrical components, single-network parallel feeding arrangement, etc., can solve the problems of complex control system and high overall price
CN112532087AActive Publication Date: 2021-03-19BEIJING ARITIME INTELLIGENT CONTROL
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING ARITIME INTELLIGENT CONTROL
Publication Date
2021-03-19

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Abstract

The invention discloses a switching type power grid commutation rectification feedback system and a control method thereof, belongs to the technical field of power electronic conversion, and particularly comprises the following steps: a control module mainly completes trigger control of an IGBT power module and the feedback function from a DC bus to a power grid; a signal acquisition and detectionmodule acquires alternating-current and direct-current voltages and currents, converts a coordinate system, transmits the alternating-current and direct-current voltages and currents to the power grid synchronous phase-locked loop model for tracking, solves a synchronous phase-locked angle theta ss, allocates trigger pulses according to a trigger logic switch sector table, and transmits the trigger pulses to the power module; in the power module, six power modules form a three-phase full-bridge rectification feedback sub-module, each power module comprises an IGBT turn-off device and a diodeconnected with the IGBT turn-off device in parallel, the six diodes complete conversion of three-phase alternating-current voltage into direct-current voltage, the six IGBT turn-off devices complete feedback of a direct-current bus to a power grid, and on and off of the IGBT turn-off devices are synchronous with the power grid. According to the system, the reactive current is limited by using thedirect current bus voltage UDC control, and the IGBT device heating caused by the feedback current in the no-load state is avoided.
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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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