Method for controlling single-phase inverters by aid of adaptive current models in predictive manner

Abstract

The invention discloses a method for controlling single-phase inverters by the aid of adaptive current models in a predictive manner, and relates to inversion control on current transformers. The method includes steps of 1), repeatedly acquiring currents of alternating-current sides of the inverters and acquiring measured current values by means of mean filtering; 2), constructing an augmented state space equation by the aid of the measured current values obtained at the step 1) and unknown deviation in circuits, designing Luenberger observers and observing unknown deviation values in the circuits; 3), compensating circuit equations with the unknown deviation values obtained at the step 2), controlling the single-phase inverters by the aid of the models in the predictive manner and accurately tracking currents. The measured current values obtained at the step 1) and the unknown deviation are used as state variables. The Luenberger observers are characterized in that unknown deviation values of the models are equivalent to a slowly varying variable, accordingly, dimensions of the Luenberger observers can be reduced, and the Luenberger observers are convenient to implement. The method has the advantages that accurate current tracking can be realized, current harmonic distortion is small, current robustness is high, transient time is short, and current stability can be fast restored from disturbance.

Description

technical field [0001] The invention relates to inverter control of a converter, in particular to an adaptive current model predictive control method for a single-phase inverter. Background technique [0002] In recent years, thanks to the rapid development of semiconductor technology and computer technology, research on power electronics technology has also achieved fruitful results. As an important branch of power electronics technology, inverter technology has been widely used in AC drives, active filters, static var compensators, and grid interconnection. As an important interface device in the power grid, the performance of the inverter determines the quality of electric energy. Therefore, relevant national departments and international organizations have issued a series of standards, and at the same time attracted a large number of scholars to devote themselves to the research of inverter control technology. . [0003] The core issue of inverter control is current tr...

AI Technical Summary

Problems solved by technology

However, in the actual process, due to uncertain factors such as device technology, temperature, abnormal operation status, and faults, unknown deviations that are difficult to measure directly will be introduced into the system parameters, and these deviations will bring periodic disturbances to the system. When it is too large, it will affect the control effect and even cause the system to crash

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