Rapid weight-coefficient-free model predictive control calculation method and system

Abstract

The invention discloses a rapid weight-coefficient-free model predictive control calculation method and system. The relative relation between positive and negative bus voltages in a present period is determined; a sector, in which a reference voltage vector of the present period is positioned in a voltage space vector, and M first voltage vectors in the sector are determined; according to the voltage vector and the correspondence table of the positive and negative bus voltages obtained in advance, N second voltage vectors whose relative relation between the positive and negative bus voltages is opposite to the relative relation of the present period are selected from the M first voltage vectors; N objective function values are obtained according to the N second voltage vectors and an objective function relation respectively, and a second voltage vector corresponding to the minimal objective function value serves as the voltage vector of an inverter of a next period; and the objective function relation does not include a weight coefficient. According to the method and system of the invention, the objective function relation is simplified, the calculation process is simple, the amount of voltage vectors to be measured can be further reduced, and the calculation process is simplified.

Description

technical field [0001] The invention relates to the technical field of model predictive control, in particular to a method and system for calculating fast model predictive control without weight coefficients. Background technique [0002] In recent years, with the development of microelectronics technology, model predictive control (MPC) has attracted extensive attention and research hotspots from scholars at home and abroad. Among various predictive algorithms, finite switching states model predictive control (FS-MPC) evaluates each behavior (switch combination) online according to the objective function, and selects the one that satisfies the minimum objective function. The combination of switches realizes the control of the power electronic converter. [0003] FS-MPC needs to conduct online calculation and online optimization of the predictive model and the objective function of model predictive control in each control cycle, which requires a large amount of calculation ...

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Problems solved by technology

[0004] However, there are weight coefficients set in the objective function, which need to be obtained through trial and error, and it may be necessary to calculate different weight systems when performing predictive control for different inverters, and the calculation process is complicated; Measure the number of voltage vectors, but there are multiple voltage vectors in a sector, when there are many switch states, the calculation amount is still large

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