LVRT-DGFACTS devices in wind farms

DGFACTS comparative in wind power to solve LVRT requirements

“…This type of inverter uses the Pulse-Width Modulation (PWM) technique to synthesize a sinusoidal waveform from a DC voltage source with a typical chopping frequency of a few kilohertz. For a brief description of the characteristics of DSTATCOM, DVR, or UPQC see [3].…”

“…The network model consists of the connection arrangement of a wind farm connected to the electricity system on the 120 kV transmission grid through a step-up substation that receives the energy from the wind farm via a 25 km overhead line, at a nominal voltage of 25 kV [8]. The especifications of the system can be seen in [3]. The reason for focusing the study on wind farms equipped with squirrel-cage induction generators (SCIG) is their incapacity on their own to deal with the ever more demanding requirements made by the system operator [9,10,11], as we noted in section II.…”

“…The purpose of DGFACTS (Distributed Generation -Flexible Alternating Current Transmission Systems), which are also referred to as Custom Power Systems (CUPS), is to improve the quality of the supply in Distributed Generation grids through the integrated application of power electronic controllers, as a means for improving the quality of the electricity supply. This purpose becomes especially significant when dealing with the massive integration of renewable energy sources for power generation and distributed generation (DG) in power grids [1,2,3]. This paper focuses on this line of work, with the mounting of DGFACTS Power devices in a wind farm for facilitating the integration of wind energy into the electricity system.…”

“…The aforementioned options provide the wind farms with LVRT capability, in addition to catering for numerous other possibilities that have not been included within this research. A previous work of the authors, dealing with symmetric (three phase) short circuits [3], the most dangerous fault, is used as basis of this work, which analyses the asymmetric short circuits (one and two phases).…”

Coordinated Control Strategies with and without Circulating Current in Unified Power Quality

“…The development of custom power technology (CPT) provides methods to effectively solve power quality problems. As one type of CPT equipment, the UPQC combines series voltage compensation theory with parallel current compensation theory, which can deal with the asymmetry and harmony of the grid-side voltage and the asymmetry and harmony of the load-side current [1]- [7].…”