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Energies 2014, 7(4), 2476-2497; doi:10.3390/en7042476
Article

Design of a Control Scheme for Distribution Static Synchronous Compensators with Power-Quality Improvement Capability

1,*  and 2
Received: 15 February 2014 / Revised: 6 April 2014 / Accepted: 16 April 2014 / Published: 22 April 2014
(This article belongs to the Special Issue Smart Grids: The Electrical Power Network and Communication System)
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Abstract

Electric power systems are among the greatest achievements of the last century. Today, important issues, such as an ever-increasing demand, the flexible and reliable integration of distributed generation or a growth in disturbing loads, must be borne in mind. In this context, smart grids play a key role, allowing better efficiency of power systems. Power electronics provides solutions to the aforementioned matters, since it allows various energy sources to be integrated into smart grids. Nevertheless, the design of the various control schemes that are necessary for the correct operation of the power-electronic interface is a very important issue that must always be taken into consideration. This paper deals with the design of the control system of a distribution static synchronous compensator (DSTATCOM) based on flying-capacitor multilevel converters. The control system is tailored to compensate for both voltage sags by means of reactive-power injection and voltage imbalances caused by unbalanced loads. The design of the overall control is carried out by using the root-locus and frequency-response techniques, improving both the transient response and the steady-state error of the closed-loop system. Simulation results obtained using PSCADTM/EMTDCTM (Manitoba Hydro International Ltd., Commerce Drive, Winnipeg, MB, Canada) show the resultant voltage regulation.
Keywords: power quality; voltage sag; smart grid; distribution static synchronous compensator (DSTATCOM); flying-capacitor multilevel converter power quality; voltage sag; smart grid; distribution static synchronous compensator (DSTATCOM); flying-capacitor multilevel converter
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Roncero-Sànchez, P.; Acha, E. Design of a Control Scheme for Distribution Static Synchronous Compensators with Power-Quality Improvement Capability. Energies 2014, 7, 2476-2497.

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