A power cabinet for static frequency conversion starting of a large-capacity synchronous machine

Abstract

The invention discloses a power cabinet for static frequency conversion starting of a large-capacity synchronous machine, and belongs to the field of semiconductor converter technology and electric drive. The power cabinet comprises a flat-wave direct current reactor cabinet, A 3-phase full-controlled thyristor rectify cabinet is fixedly connected to one side of that flat-wave DC reactor cabinet,A thyristor invert cabinet is fixedly connected on that other side, the structures of the three-phase full-controlled thyristor rectify cabinet and the thyristor inverter cabinet are identical, and the rectifying circuit in the three-phase full-controlled thyristor rectify cabinet and the inverter circuit in the thyristor inverter cabinet are connected through two flat-wave direct current reactorsin the flat-wave direct current reactor cabinet; The power cabinet provided by the invention is reasonable in layout, compact in structure and simple in operation. The thyristor module is integral and simple in maintenance in later period, and can meet the requirements of series connection or parallel connection of the thyristor modules with high voltage and high current required for starting a large-capacity synchronous motor.

Description

technical field [0001] The invention belongs to the field of semiconductor converter technology and electric transmission, and in particular relates to a power cabinet used for static variable frequency starting of a large-capacity synchronous machine. Background technique [0002] At present, large-scale synchronous motors are the key equipment of the national economy. Its soft start generally adopts a static variable frequency starter (LCI, Load Commutated Inverter, that is, a load commutated current source inverter) device. Cut to grid operation. The static variable frequency starting (LCI) device is to rectify the three-phase AC power through the thyristor full bridge to become an intermediate DC voltage, and then pass through the thyristor inverter bridge group to become a three-phase AC power with variable voltage and frequency to supply the stator winding of the motor to achieve The purpose of starting the motor and running the motor to the synchronous speed. For th...

AI Technical Summary

Problems solved by technology

For the starting of large-capacity synchronous motors, the voltage is high and the current is large, and the rectifier modules need to be connected in series or in parallel, which makes the frequency conversion starting system more equipment, occupies a large area, has a high failure rate, and requires a lot of maintenance.

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