A transmission system control redundancy and fault tolerance method

Abstract

Transmission system control redundancy and fault tolerance method, perform the following operations: cascaded high-voltage inverters are equivalent to multiple cascaded units, each cascaded unit includes its own transformer secondary winding, power module and control interface; The parameters of each cascaded unit, the parameters of each cascaded unit include the current of each phase, and, or the phase of each phase of each cascaded unit, and, or the voltage between every two phases, and, or each phase The intermediate DC voltage, and, or the real-time temperature of each cascaded unit; and, or the intermediate support capacitor ripple current of each cascaded unit, and, or the output voltage and current waveform of each cascaded unit; the parameters of the cascaded unit Compare and judge whether the parameters meet the normal operation requirements of the high-voltage inverter. If they meet, the high-voltage inverter is considered to be in normal working condition. If not, it is considered that there may be abnormal operation. The invention has the advantages of being able to monitor the operating reliability of the frequency converter in real time and identify the risk of failure of each cascaded unit during the operation of the frequency converter.

Description

technical field [0001] The invention relates to a transmission system control redundancy and fault tolerance method of a serial high-voltage frequency converter. Background technique [0002] Since 1994, Robinson Corporation of the United States launched the first unit series multi-level high-voltage inverter, due to many advantages such as perfect input and output waveforms without harmonics brought by this circuit topology, and strong versatility of power modules, its competitive advantage It is still irreplaceable to this day, and has always been the mainstream of the high-voltage inverter market. [0003] At the same time, high-voltage frequency converters are mainly used in various mines, metallurgy, electric power, and municipal production lines, and have the characteristics of long-term operation and high reliability requirements. The cascaded high-voltage inverter consists of a phase-shifting transformer, a power unit, and a control system. The phase-shifting trans...

AI Technical Summary

Problems solved by technology

[0004] However, the unit series cascaded high-voltage inverter has a complex front-end step-down phase-shifting transformer, which is difficult to design and manufacture. The number of power components is large, the volume is large, and there are many fault points, making the reliability of the whole machine a technical problem that needs to be further improved.