A weighted sliding mode model predictive current control method for three-phase grid-connected inverters
A model prediction and current control technology, applied in the irreversible DC power input to AC power output, AC power input to DC power output, electrical components, etc. Design complexity and other issues to achieve the effect of enhanced robustness, low current harmonics and current control errors
Active Publication Date: 2022-07-01
CHINA ELECTRIC POWER RES INST +1
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[0004] In view of the technical problems existing in the existing model predictive control technology, such as complex system design, large amount of calculation, serious equipment loss, and great influence of parameter changes, the present invention proposes a weighted sliding mode model for predicting the current of a three-phase grid-connected inverter The control method, by adding the sliding mode control term in the objective function, reduces the influence of parameter changes on model predictive control, and improves the robustness of model predictive current control to parameter changes
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[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0056] like figure 1 and 2 As shown, the embodiment of the present invention provides a weighted sliding mode model predictive current control method for a three-phase grid-connected inverter. According to the sliding mode variable structure control theory and the model predictive control theory, a new model predictive control objective function is established. . The objective function is weighted by the objective function of conven...
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The invention proposes a three-phase grid-connected inverter weighted sliding mode model prediction current control method. The inverter output voltage corresponding to the voltage vector; sampling the output current of the three-phase grid-connected inverter and the three-phase grid voltage, and transforming the three-phase output current and the three-phase grid voltage to obtain the current component and voltage component; according to the inverter The output voltage, the output current component and the three-phase grid voltage component are calculated to obtain the output current at the next moment; the objective function is calculated according to the inverter output voltage, output current component and the output current at the next moment; The voltage vector corresponding to the minimum value of the objective function is the optimal voltage vector, which is used to control the grid-connected inverter. The invention improves the robustness of the model prediction current control to parameter changes by adding a sliding mode control term in the objective function.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a weighted sliding mode model predictive current control method for a three-phase grid-connected inverter. Background technique [0002] In recent years, with the vigorous development of new energy power generation technology, the research of new energy grid-connected inverter technology is very important. Among the existing control strategies of grid-connected inverters, control methods such as PI double closed-loop control, repetitive control, hysteresis control, sliding mode variable structure control, and model predictive control have gradually developed and matured. Among them, model predictive control has become a research hotspot in the field of power electronics technology in recent years because of its intuitive concept, easy to understand, and easy to realize nonlinear multi-objective cooperative control. However, the traditional grid-connected inverter model...
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IPC IPC(8): H02J3/38H02M7/48H02M7/493
CPCH02J3/38H02M7/48H02M7/493
Inventor 罗魁刘鸷郭磊磊郑铭哲金楠李琰琰卢法龙陈亚斐王朋帅朱林强
Owner CHINA ELECTRIC POWER RES INST