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Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
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In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
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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.

Scientific Reports
|November 21, 2025
PubMed
Summary

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.

Keywords:
AC voltage sensorlessBackstepping design approachDC offsetGrid voltage observerLumped DC offset observer

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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.