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An AC voltage sensorless predictive current control method for grid-tied inverter with enhanced robustness against
Guolin Zhang1, Weidong Dong2, Lingfeng Meng3
1GD Power Development Co.,LTD, Beijing, 100101, China.
This study introduces a new method to improve grid-tied inverter control by addressing current DC offset errors. The enhanced observer and DC offset compensation method significantly boosts robustness and control performance.
Area of Science:
- Electrical Engineering
- Power Electronics
- Control Systems
Background:
- Grid-tied inverters require precise current control for efficient power transfer.
- Conventional sensorless predictive current control methods are vulnerable to current DC offset errors, degrading performance.
Purpose of the Study:
- To develop an AC voltage sensorless predictive current control method with enhanced robustness against current DC offset errors.
- To improve the control performance of grid-tied inverters in the presence of DC offsets.
Main Methods:
- Design of an improved grid voltage observer using a backstepping approach to mitigate DC offset influences.
- Development of a novel lumped DC offset observation method for accurate estimation and compensation.
- Integration of the observers into a new AC voltage sensorless predictive current control strategy.
Main Results:
- The improved grid voltage observer effectively eliminates the impact of current DC offsets.
- The lumped DC offset observation method accurately estimates and compensates for DC offsets.
- The proposed control method demonstrates significantly enhanced robustness against current DC offsets.
Conclusions:
- The novel AC voltage sensorless predictive current control method offers superior robustness against current DC offsets.
- Experimental validation confirms the effectiveness and reliability of the proposed approach for grid-tied inverters.
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