Observer‑based load current sensorless control strategy of inverter circuit in three‑phase UPS

Jiajie Chang; Lan Xiao

Observer‑based load current sensorless control strategy of inverter circuit in three‑phase UPS

Jiajie Chang

Lan Xiao

Vol. 20, No. 1, pp. 142-151, Jan. 2020

10.1007/s43236-019-00004-7

Inverter

Load current sensorless

Observer

Three-phase UPS

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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Cite this article

[IEEE Style]

J. Chang and L. Xiao, "Observer‑based load current sensorless control strategy of inverter circuit in three‑phase UPS," Journal of Power Electronics, vol. 20, no. 1, pp. 142-151, 2020. DOI: 10.1007/s43236-019-00004-7.

[ACM Style]

Jiajie Chang and Lan Xiao. 2020. Observer‑based load current sensorless control strategy of inverter circuit in three‑phase UPS. Journal of Power Electronics, 20, 1, (2020), 142-151. DOI: 10.1007/s43236-019-00004-7.