Control strategy for dynamic voltage restorers to achieve minimum power injection without introducing sudden phase shift

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Control strategy for dynamic voltage restorers to achieve minimum power injection without introducing sudden phase shift

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Published

A power injection control strategy is proposed for dynamic voltage restorers (DVR) under voltage sag or swell conditions. Under such a strategy, the error between the voltage of the energy storage capacitor in the DVR and a given reference voltage is extracted to control the injected power such that during an upstream voltage disturbance, zero or minimum power injection can be achieved automatically, while sudden phase jump of the load-side voltage can also be avoided. The proposed control strategy is analysed in detail and numerical examples are provided to demonstrate the effectiveness of the scheme.

Inspec keywords: power system control; capacitor storage; power system faults; power supply quality

Other keywords: minimum power injection; reference voltage; swell conditions; dynamic voltage restorers; upstream voltage disturbance; power injection control strategy; energy storage capacitor; voltage sag

Subjects: Power supply quality and harmonics; Control of electric power systems; Power system control

References

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      • Wunderlin, T., Dahler, P., Amhof, D., Gruning, H.: `Power supply quality improvement with a dynamic voltage restorer', Proc. Int. Conf. Energy Manage Power Delivery, 1998, 2, p. 518–525.
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      • Ghosh, A., Ledwich, G.: `Structures and control of a dynamic voltage regulator (DVR)', IEEE Power Engineering Society Winter Meeting, 28 January–1 February 2001, 3, p. 1027–1032.
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      • Jung, H.J., Suh, I.Y., Kim, B.S., Kim, R.Y., Choi, S.Y., Song, J.H.: `A study on DVR control for unbalanced voltage compensation', Applied Power Electronics Conf. and Exposition, APEC 2002, Seventeenth Annual IEEE, 10–14 March 2002, 2, p. 1068–1073.
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