High-Performance Control of Three-Phase Four- Wire DVR Systems using Feedback Linearization

Seon-Yeong Jeong; Thanh Hai Nguyen; Quoc Anh Le; Dong-Choon Lee

High-Performance Control of Three-Phase Four- Wire DVR Systems using Feedback Linearization

Vol. 16, No. 1, pp. 351-361, Jan. 2016

10.6113/JPE.2016.16.1.351

Dynamic voltage restorers

Feedback linearization

SOGI-PLL

three-phase four-wire VSI

voltage unbalance

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Abstract

Power quality is a critical issue in distribution systems, where a dynamic voltage restorer (DVR) is commonly used to mitigate the voltage disturbances for loads. This paper deals with a nonlinear control for the three-phase four-wire (3P-4W) DVR under a grid voltage unbalance and nonlinear loads in the distribution system, where a novel control scheme based on the feedback linearization technique is proposed. Through feedback linearization, a nonlinear model of a DVR with a PWM voltage-source inverter (VSI) and LC filters is linearized. Then, the controller design of the linearized model is performed by applying the linear control theory, where the load voltages are kept constant by controlling the d-q-0 axis components of the DVR output voltages. To keep the load voltage unchanged, an in-phase compensation strategy is employed, where the load voltages are recovered to be the same as the previous voltage without a change in the magnitude. With this strategy, the performance of the DVR becomes faster and more stable even under unbalanced source voltages and nonlinear loads. The validity of the proposed control strategy has been verified by simulation and experimental results.

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Cite this article

[IEEE Style]

S. Jeong, T. H. Nguyen, Q. A. Le, D. Lee, "High-Performance Control of Three-Phase Four- Wire DVR Systems using Feedback Linearization," Journal of Power Electronics, vol. 16, no. 1, pp. 351-361, 2016. DOI: 10.6113/JPE.2016.16.1.351.

[ACM Style]

Seon-Yeong Jeong, Thanh Hai Nguyen, Quoc Anh Le, and Dong-Choon Lee. 2016. High-Performance Control of Three-Phase Four- Wire DVR Systems using Feedback Linearization. Journal of Power Electronics, 16, 1, (2016), 351-361. DOI: 10.6113/JPE.2016.16.1.351.