Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Observer-based load current sensorless control strategy of inverter circuit in three-phase UPS

  • Chang, Jiajie (Department of Electrical Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Xiao, Lan (Department of Electrical Engineering, Nanjing University of Aeronautics and Astronautics)
  • Received : 2018.12.14
  • Accepted : 2019.07.18
  • Published : 2020.01.20
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Abstract

A load current sensorless control strategy using an optimized observer is designed for a three-phase online transformer-based UPS. A closed-loop observer containing state feedback is constructed based on the improved state space model of the inverter circuit. A simple feedback matrix design method is then applied to the observer according to the dead-beat control law, and the load current feedforward control scheme is reconstructed using the proposed observer. This control strategy can save three load current sensors, reduce the THD of the output voltage, and improve dynamic performance. The effectiveness of this strategy is verified by conducting simulation and experiment in a 10 kVA UPS.

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References

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