A Model Predictive Control Method for Three-phase Controlled Rectifier Based on Switch Table

Abstract

The invention discloses a three-phase controllable rectifier model prediction control method based on a switching table. The three-phase controllable rectifier model prediction control method is characterized in that (1) a power grid voltage vector angle can be divided into twelve sectors, eight candidate voltage control vectors are adopted for a three-phase controllable rectifier; (2) according to the rule of the active and passive power of the power grid side of the three-phase controllable rectifier changing along with the power grid voltage vector angle, the candidate control vector corresponding to every sector can be determined, and then the switching table can be generated; (3) at the current moment, the sector, which is provided with the current power grid voltage vector angle, can be determined, and the corresponding candidate voltage control vector can be extracted from the switching table; (4) the active and passive power of power grid side of the next moment can be predicted according to the extracted candidate voltage vector, and the optimal voltage control vector can be selected. According to the invention, the switching table and the model prediction control algorithm can be combined together, and the most candidate voltage vectors can be eliminated by the switching table, and the calculated amount can be reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of rectifier control, and more specifically relates to a model predictive control method based on a switch table. Background technique [0002] The three-phase controllable rectifier can better stabilize the DC bus voltage. When the load changes, the DC bus voltage can be stabilized near the reference value. At the same time, it can also control the power factor on the grid side to achieve a power factor of 1. The current harmonic content is small. Therefore, in recent years, in order to improve the working efficiency and performance of the rectifier, the controlled rectification is constantly replacing the uncontrolled rectification. [0003] Since the switching devices of the three-phase controllable rectifier can be turned on and off arbitrarily, the working mode is relatively flexible, and different working performances can be realized by combining with different control strategies. The current main co...

AI Technical Summary

Problems solved by technology

However, due to the relatively large amount of calculations in online calculations, processors with better performance are required to implement power predictive control algorithms.

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