Abstract
Using power electronic converters with reduced capacity in doubly-fed induction generator (DFIG) based wind turbines make them vulnerable to over-current during grid disturbances. This thesis aims to analyze the behaviour of doubly-fed induction generators based wind farm for various timing schemes of crowbar deactivation and resumption of rotor side converter (RSC) in the case of grid fault. Also, usage of a static synchronous compensator (STATCOM) for the purpose of stabilizing the grid voltage after a three-phase fault is studied in this these. Moreover, finding minimum capacity of STATCOM which ensures low-voltage ride through (LVRT) of wind farm is studied. Finally, coordination of reactive power from wind turbine generators and STATCOM in steady-state condition is performed. All the results in this thesis show that STATCOM improves low voltage ride through (LVRT) capability of wind farm and assists for an uninterrupted operation of wind turbine generators during grid faults.
Highlights
1.1 Wind Energy Conversion SystemWind power is the fastest growing renewable energy source
It was shown in the simulation that for a weak grid without using a STATCOM, the PCC voltage could not reach the nominal voltage after the grid fault was cleared and the wind turbine had to be disconnected from the grid to guarantee a fast grid recovery and to satisfy power quality requirements
The rating and characteristics of the doubly-fed induction generator (DFIG) wind farm are given in the appendix, the rating of the D-STATCOM used in this system is 5 Mvar and the reactive demand of the local load is in the range of 5 to 7 Mvar
Summary
1.1 Wind Energy Conversion SystemWind power is the fastest growing renewable energy source. With existence of a certain inductive local load in the location close to wind farm and STATCOM (e.g. the power system is similar to figure 4-4) , finding the optimum ratio of reactive power flow from STATCOM and DFIG wind farm is the objective of this chapter This optimization is based on losses of DFIG and STATCOM, while considering maximum active power extraction of wind turbines in different operation modes.
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