ABSTRACT:
Fault
ride through(FRT) capability in wind turbines to maintain the grid stability during
faults has be- come mandatory with the increasing grid penetration of wind energy
.Doubly fed induction generator based wind turbine(DFIG-WT) is the most popularly
utilized type of generator but highly susceptible to the voltage disturbances in
grid. Dynamic voltage restorer (DVR) based external FRT capability improve mentis
considered. Since DVR is capable of providing fast voltage sag mitigation during
faults and can maintain the nominal operating conditions for DFIG-WT. The effectiveness
of the DVR using Synchronous reference frame (SRF) control is investigated for FRT
capability in DFIG-WT during both balanced and unbalanced fault conditions .The
operation of DVR is confirmed using time-domain simulation in MATLAB/Simulinkusing1.5MWDFIG-WT.
KEYWORDS:
1.
Doubly fed induction generator (DFIG)
2.
Fault ride through (FRT)
3.
Low voltage ride through (LVRT)
4.
Dynamic voltage restorer (DVR)
5.
Synchronous reference frame (SRF)
control
The
FRT capability of wind turbines are essential with the growing integration of
wind power in the grid and contribute to the reliable grid integration. There
are several countries which have recently imposed the mandatory guidelines for
FRT capability implementation in already installed and operating grid connected
wind turbines. Therefore this paper investigates the performance of DVR with
SRF control for the FRT capability of DFIG-WTs. The control performance is
compared with Feed-forward control which is operated with the same synchronous
reference frame. The performance of the controllers is compared for the voltage
sag mitigation during balanced and unbalanced grid faults. The har- monic
mitigation capability of DVR is also discussed. The com- parison of harmonic
compensation of both controllers in terms of % THD shows that SRF control
provides better performance. The performance comparison suggests that the
operation of DVR is suitable for FRT capability as per grid code standards
imposed globally. Simulation results show better performance of DVR with SRF
control for improving the FRT capability of DFIG-WT.
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