40220140506002

International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print),
ISSN 0976 – 6553(Online) Volume 5, Issue 6, June (2014), pp. 17-29 © IAEME
17
ENHANCED FAULT RIDE-THROUGH TECHNIQUE FOR PMSG WIND
TURBINE SYSTEMS USING DC LINK BASED ROTOR-SIDE
CONTROLLER
Anas Abdulqader khalaf
Bharati Vidyapeeth Deemed University, Pune
ABSTRACT
In the field of renewable energy generation has been observed wind energy. Where the
technology is more rapid growth. It attracts attention as one of the most effective ways in terms of
the cost of generating electricity from renewable energy sources. The system wind generation has
application for support grid. Voltage of the wind generator permanent magnet synchronous generator
(PMSG) is directly driven by a variable due to the sporadic nature of wind energy. Voltage
fluctuation and power of major concern in the connected network systems generate electricity using a
wind converter list. Inverter is essential for interaction of from wind sources with Ac network. There
are many as possible inverter the topology and inverter switch plans and each one will have its
comparative advantages and disadvantages. Synchronous generators used a variable speed the
permanent magnet to extract the utmost of energy from wind energy conversion system. The is
suggested common strategy for power control the permanent magnet synchronous generator a system
based on wind energy conversion (WECS) operating under different the network conditions. In the
strategy, is used by the converter generator to dominate the voltage The DC link converter side of the
network is responsible for the controlling the energy flow injected into the grid. Console by the
generator has the potential inherent damping of torsional oscillations caused by the characteristics of
the drive train. It uses the control of the part of the grid to meet the (power) requirements of active
and reactive current laws specified in the grid. At the same time alleviate the distortions from the
current network fault even with non-symmetric. Errors through the network, the converted by the
generator automatically reduces the current transformers to keep the prey DC voltage generator
acceleration caused by that organization Pitch. Compared with the traditional strategy, chopper, DC,
which aims to help ride through the fault of the WECS, Could be eliminated if you use the proposed
plan. Compared with the control system variable regulator. The proposed strategy has the responses
faster and more accurate power which is beneficial to the recovery grid. The simulation results
CHECK the effectiveness of proposed strategies. The hybrid control scheme proposed for energy
storage systems (ESS), helicopters braking fault ride through the capability and suppress fluctuation
INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING &
TECHNOLOGY (IJEET)
ISSN 0976 – 6545(Print)
ISSN 0976 – 6553(Online)
Volume 5, Issue 6, June (2014), pp. 17-29
© IAEME: www.iaeme.com/ijeet.asp
Journal Impact Factor (2014): 6.8310 (Calculated by GISI)
www.jifactor.com
IJEET
© I A E M E

18
the power output of the permanent magnet synchronous generator (PMSG) of wind turbine systems.
Errors through the grid. In DC link is controlled by the voltage link ESS rather than converting both
sides of the line (LSC). While LSC is utilized as a STATCOM to inject the current recession in the
grid to assist in the voltage grid.
Index Terms: PMSGs, WECS, ESS, STATCOM, LSC.
LITERATURE SURVEY
1) Modelling of grid-connected wind driven by the system using PMSG Rungs Kota method:
Like the wind farm PMSG connected to the grid by solving differential equations which
describe the using the method of Rungs Kota (Sermutlu 2004) as described by the RESOLUTION
graph ends with temporal variation from currents. Voltages The active energy and reactive.
2) Wind power grid-connected Chipmunks cage induction generator (SCIG) the system:
The wind driven by SCIG, The associated stator winding straight to the network and driven
by the rotor from of wind turbines is converted to energy captured by of wind turbines into electrical
energy by induction generator The broadcast on the grid by the pro-winding. Are controlled in a
corner of the pitch in order to reduce the production of generator power to their face value at high
wind speeds. In order to generate energy, it must be induction generator the speed of slightly higher
than synchronous speed. Is providing reactive force absorbed by the induction generator by the grid
or by certain devices such as the capacitor the banks, SVC, STATCOM or synchronous condenser
(The Math Works 2008A) The analysis is based on transient current the system simulation on
MATLAB / SIMULINK for approximate wind speeds fixed and variable.
3) grid-connected wind power doubling Fed Induction Generator (DFIG) the system:
The wind driven by doubling-fed induction generator (WTDFIG) Adapter AC / DC / AC
linking among the rotor of the generator to the grid. Split transforms AC / DC / AC to the two
components: The rotor side transforms (RSC) and the grid side transforms (GSC) and adapters are
voltage sources that use IGBTs confined forced to compile AC voltage from a DC voltage source.
And synthesizing voltage AC is at the frequency of the power and for the slip frequency for us. A
capacitor connected to the DC side acts serves as the source of DC voltage. The of Couplings
inductor L use a to connect to the grid. The rotor is connected to a three-phase filter by slip rings and
brushes The associated stator three-phase filter straight to the grid. Is converted to energy captured
by the wind turbines into electrical power by induction generator and transmitted to the grid from the
stator and rotor windings. Control system generates a corner of the pitch signals fait accompli default
and effort of VGC and respectively for control of the power compared to the wind turbines against
the authorities of reference which have been obtained from the flow characteristic. A Proportional-
Integral (PI) regulator is used to limit the power error to zero. While adjusting the bus voltage DC
and reactive force or voltage The network stations (The Math Works 2010A). Compared to the
system SCIG, The is based on transient analysis of the current the system also DFIG simulation
MATLAB / SIMULINK for approximate wind speeds fixed and variable.
Compare DESIGN OF WIND TURBINE BASED PMSG between literature survey
CONTROL SCHEME and PROPOSED CONTROL SCHEME
A PMSG-based WECS is simulated and analyzed when subjected to the system faults. the
PMSG-based wind power unit connected to the utility grid via a step-up transformer and
transmission line. This PMSG-based WECS was implemented in MATLAB/ SIMULINK, where the
above three different converter models are used separately for the purpose of comparison.

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Design of the Unified Power Control for the MW Class PMSG-Based WECS IN matlab
Fig. 1: PMSG BASED WECS WITH DC CHOPPER
Fig. 2: PMSG BASED WECS WITH OUT DC CHOPPER
We have different between the CONVENTIONAL CONTROL SCHEME and PROPOSED
CONTROL SCHEME in block diagram (RSC)and(GSC) in fig3 .fig4 .fig5 fig6

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Fig 3: the system RSC in proposed control scheme
Fig. 4: the system RSC literature survey control scheme
Fig. 5: the system GSC in proposed control scheme

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Fig. 6: the system GSC literature survey control scheme
SIMULATION RESULTS WITH PROPOSED AND LITERATURE SURVEY
1) Operation With Unsymmetrical Grid Faults
A)With literature survey without Dc chopper and proposed technique with chopper –AG:
Fig. 7: Rotor speed, EM torque and stator ‘A’ phase current for literature survey control scheme
system for AG fault
Fig. 8: Rotor speed, EM Torque and stator ‘A’ phase current for proposed system with chopper for
un symmetrical fault AG

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Fig. 9: DC link voltage for literature survey control scheme without dc chopper system for AG fault
Fig. 10: DC link voltage for proposed system with chopper for un symmetrical fault AG
Fig. 11: stator voltage and current for literature survey without dc copper control scheme system for
AG fault

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Fig. 12: Grid voltage and current for proposed system with chopper for un symmetrical fault AG
B) With literature survey without dc chopper and proposed technique with chopper –abg fault
Fig. 13: Rotor speed, EM torque and stator ‘A’ phase current for literature survey without dc
chopper control scheme system for ABG fault
Fig. 14: Rotor speed, EM Torque and stator ‘A’ phase current for proposed system with chopper for
un symmetrical fault ABG

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Fig. 15: DC link voltage for literature survey control scheme system for ABG fault
Fig. 16: dc link voltage across capacitor for proposed system with dc chopper for un symmetrical
fault ABG
Fig. 17: stator voltage and current for literature survey control scheme system for ABG fault

25
Fig. 18: Grid voltage and current for proposed system with chopper for un symmetrical fault ABG.
2) Operation With Symmetrical Grid Faults: With literature survey without dc copper and proposed
with dc chopper technique
Fig. 19: Rotor speed, EM Torque and stator ‘A’ phase current for proposed system with chopper
It can be observed that speed and torque oscillations were high without chopper compared to
with chopper and stator current drops to nearly zero value.
Fig. 20: Rotor speed, EM torque and stator ‘A’ phase current for literature survey without dc
chopper control scheme system for ABCG fault

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Fig. 21: DC link voltage for proposed system without chopper symmetrical fault
The DC link voltage at capacitor also decreases from 1000V to zero without chopper and
voltage decreases from 1000V to 400Volts. Hence voltage can be maintained much better with
chopper circuit. It can also be verified that voltage and current at generator terminals decreases from
unity pu to zero value without chopper and is maintained at 0.1pu with chopper.
Fig. 22: DC link voltage for literature survey without dc chopper control scheme system for ABCG
fault
Fig. 23: Grid voltage and current for proposed system with dc chopper for symmetrical fault

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Fig. 24: stator voltage and current for literature survey control scheme system for ABCG fault
CONCLUSION
The converter-based WECS has the potential to improve the transient stability of the power
system because of its quick power response. However, the rating of power devices limits its
applications. In order to make maximal use of such systems, advanced control technique should be
developed to satisfy the requirements of the power systems. The conventional control strategy for the
PMSG-based WECS is mainly designed to promise the proper operation of the generator. In the
strategy, the generator torque (power) is directly controlled while the grid side power is indirectly
regulated. The disturbance at the generator side will aggravate the power responses at the grid side,
which is not desired by the PSO. The basic idea of the proposed strategy is to first satisfy the power
system requirements under different grid conditions. In the strategy, the active/reactive current
(power) is directly regulated through the grid-side converter. In order to provide enough oscillation
damping, additional active damping loop is integrated into the generated-side controller. Compared
with the conventional or variable-structured control strategies, the proposed one has the quickest and
most precise grid-side current (power) responses. During grid fault, no Dc chopper or controller
switching is necessary with the strategy and the current distortions can be mitigated when the
unsymmetrical grid fault occurs. Moreover, the proposed strategy requires no system parameters and
is simple to implement, which makes it attractive for the engineering practice. However, such a
strategy sacrifices the response of the generator-side variables and leads to the fluctuation of the dc-
link voltage. It is believed that a large dc-link capacitor can be helpful to improve the system
performance if the proposed strategy is employed.
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