A model predictive control system and method for a rail transit three-level auxiliary converter

Abstract

The invention discloses a model prediction control system and method for a three-level auxiliary converter of rail transit. By sampling the current time signal, through a series of processing, different next time prediction signals in different switching states are obtained, which are respectively the same as the given ones. Compare the reference signal, define the loss function equal to the absolute value of the difference between the predicted signal and the reference signal, select the switch state with the smallest loss function as the control signal, and realize the experiment that the system output voltage always follows the reference voltage change and is not affected by the load change. The effect, that is, the effect of the uninterruptible power supply, has the advantages of good control effect and strong robustness, which can effectively overcome the uncertainty, nonlinearity and parallelism of the process, and can easily handle the controlled variables and manipulated variables of the process. Various constraints in the rail transit system can provide high-quality, uninterruptible power supplies for electrical equipment in the electromechanical system of rail transit, ensure the normal operation of electrical equipment, and ensure safe and efficient operation of trains.

Description

technical field [0001] The invention relates to the field of electronic power, in particular to a model predictive control system and method for a three-level auxiliary converter of rail transit. Background technique [0002] Due to the continuous acceleration of urbanization, the mobility of the population in the city has become larger and larger, and the urban traffic pressure has become larger and larger. The carrying capacity of the traditional public transport system is quickly reaching a bottleneck. At the same time, the increase in traffic flow increases the frequency of traffic congestion and greatly reduces the efficiency of attendance. [0003] The high-speed railway, light rail, maglev and other means of transportation provide faster, more comfortable, and more adaptable travel modes for long-distance travelers. The emergence of urban rail transit not only improves the intensive utilization of urban land, but also reduces people's travel. Cost, improve people's t...

AI Technical Summary

Problems solved by technology

Multilevel converters can reduce the withstand voltage of each component, and have the advantages of high output voltage level, large output capacity, and less output harmonic content, but at the same time, they have disadvantages such as relatively complex structure, more components, and difficult control.

For example, the control of the traditional rail transit three-level auxiliary converter is controlled by a proportional integral (PI) controller + PWM, and the selection of appropriate PI parameters requires a lot of experiments. At the same time, the dynamic performance of the traditional PI controller + PWM control method slow

Images