System for transmitting control signal of high voltage frequency converter power unit

Abstract

The invention relates to a control system of a high voltage inverter in an electrical system, in particular to a transmission system of the power unit control signals of the high voltage inverter. The system comprises three optical fibers which are connected between a power unit and a controller and are used for signal transmission, wherein, one of the optical fibers is used for transmitting uplink signals sent to the controller by the power unit, and power unit state signals pass through a single chip microcomputer and an electricity / light conversion circuit and then are transmitted to the controller by the optical fiber; the other two optical fibers are used for transmitting downlink signals sent to the power unit by the controller, and power unit IGBT driving signals and power unit control signals emitted from the controller are transmitted by the two optical fibers and then are transmitted to the power unit after passing through the electricity / light conversion circuit. The technology of the invention has good feasibility and low cost, and significantly improves the reliability of a circuit.

Description

technical field [0001] The invention relates to a control system of a high-voltage frequency converter in an electrical system, in particular to a control signal transmission system of a high-voltage frequency converter power unit. Background technique [0002] With the development of power electronics technology, as a product of the development of power electronics technology, frequency converters have been widely used in steel, petrochemical, tap water, electric power and other industries, especially high-voltage frequency converters. [0003] At present, high-voltage inverters are mainly divided into two types: voltage source type and current source type. Current type inverters have disadvantages such as low power factor and large harmonic pollution to the power grid, and their application occasions are greatly restricted. There are mainly the following types of voltage source high-voltage inverters: [0004] 1. High-low mode high-voltage inverter: convert the voltage of...

AI Technical Summary

Problems solved by technology

Although the third type is a relatively new technology, due to the limitation of devices, the maximum voltage can only reach 4160 volts. For domestic 6KV and 10KV mainstream power grids, the application is limited

Since the communication adopts a serial method, it is fundamentally unable to overcome the shortcomings of transmission delay and slow transmission speed.

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