Sliding mode observer-based AC voltage sensorless model predictive control for grid-connected inverters

Recently, model predictive control has been widely used to control grid-connected inverters due to its advantages. However, the conventional model predictive control methods usually require two AC voltage and current sensors to sample the grid voltages and currents. Particularly, the DC voltage sens...

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Bibliographic Details
Published in:IET power electronics 2020-08, Vol.13 (10), p.2077-2085
Main Authors: Guo, Leilei, Li, Yanyan, Jin, Nan, Dou, Zhifeng, Wu, Jie
Format: Article
Language:English
Subjects:
current sensors
DC voltage sensor
electric current control
grid voltages
grid‐connected inverters
invertors
low‐pass filters
observed grid voltage
observers
power grids
predictive control
Research Article
sensorless machine control
sliding mode observer‐based AC voltage sensorless model predictive control
variable structure systems
voltage vectors
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Summary:Recently, model predictive control has been widely used to control grid-connected inverters due to its advantages. However, the conventional model predictive control methods usually require two AC voltage and current sensors to sample the grid voltages and currents. Particularly, the DC voltage sensor is also required to calculate the values of the voltage vectors. The inverter will lose its stability once these sensors fail. Thus, in this study, to improve the operational reliability of the grid-connected inverters, a sliding mode observer-based AC voltage sensorless model predictive control is proposed. First, a sliding mode observer is designed to estimate the grid voltage. Next, a new adaptive compensation strategy is proposed to remove the phase and amplitude errors caused by the low-pass filter. The main novelty of this compensation strategy is that it is immune to the actual grid frequency. Therefore, the grid voltage can be identified accurately, even under frequency deviation conditions. Besides, the stability and parameter designing method of the sliding mode observer is also analysed to provide a theoretical basis for its implementation. Finally, based on the observed grid voltage, the AC voltage sensorless model predictive control is achieved. Detailed comparative experimental results show the validity of the proposed method.
ISSN:1755-4535
1755-4543
1755-4543
DOI:10.1049/iet-pel.2019.1075