Three-phase silicon controlled rectifier voltage regulating system with self-adaptive performance

Abstract

The invention discloses a three-phase silicon controlled rectifier voltage regulating system with self-adaptive performance, which is provided with an input wiring unit, wherein the input wiring unit is provided with three-phase power ports A, B and C, a silicon controlled rectifier conduction angle control signal PWM port and an enable signal EN port, the three-phase power ports A, B and C are connected with the input end of a three-phase power synchronous sampling transformer, the output end of the three-phase power synchronous sampling transformer is connected with the input end of the three-phase power synchronous processing unit, and the output end of the three-phase power synchronous processing unit, the conduction angle control signal PWM port and the enable signal EN port are all connected with the input end of a programmable logic device CPLD, the output end of the CPLD is connected with an output wiring unit through a driving isolation unit, and the output wiring unit is provided with six silicon controlled rectifier conduction angle trigger signal output ports P1P2, P3P4, P5P6, P7P8, P9P10, P11P12.

Description

technical field [0001] The invention relates to a three-phase thyristor voltage regulating system, in particular to a three-phase thyristor voltage regulating system with self-adaptive performance which is suitable for three-phase thyristor rectification and inverter topologies. Background technique [0002] The three-phase thyristor voltage regulation technology is to achieve voltage adjustable output by triggering and controlling the conduction angle of three pairs of thyristors. It has been widely used in three-phase full-bridge inverter circuits, three-phase half-bridge inverter circuits and three-phase Variable boost circuit, etc. At present, the three-phase thyristor voltage regulation technology generally adopts the power grid synchronous signal input to the CPU unit based on the single-chip microcomputer for processing, and sends the thyristor conduction angle trigger signal by analyzing the power grid synchronous signal. There are the following problems: it is nece...

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Problems solved by technology

There are the following problems: it is necessary to configure a series of circuits with complex structures such as synchronous signal sampling circuit, isolation circuit, level conversion circuit and drive circuit, the failure rate is high, and the maintenance is cumbersome; Frequent interruption affects the execution of other main programs, and the work efficiency is low; the CPU unit needs to trigger different topological structures for the three-phase thyristor at the back end, and the conduction angle is calibrated through the program alone, which has poor versatility

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