Review of Power Quality Improvement Techniques in HVDC Systems Using FACTS Devices
Keywords:
Power quality, Flexible AC transmission system (FACTS) devices, UPFC, SVC, STATCOM.Abstract
In a recent trend for controlling of most of the industrial loads is mainly based on semiconductor devices which cause such loads to be more sensitive against power system disturbances. Thus, the power quality problems have gained more interest recently. This paper presents a review of some of the disturbances, on the source side that may cause problems on the load side. The focus is given on problems associated with voltage dips as voltage dips have been reported to be the most severe problems to industrial loads. The power quality has an important role in the power supply industry. As the power providers are turning to smart grid and smart meters, the standards for power quality needs to be revisited. The power quality can be categorized into two groups, one addressing the standard for the power quality supplied at the grid level and the other group which deals with the factors that affect the power quality at user level. These factors include harmonics, voltage changes, sags, transients, voltage unbalance, etc. These factors will provide us in-depth details about the power system network. In this paper, an overview of various factors will be presented in order which can affect the power quality of the system.
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