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Injection of the wind power into an electric grid affects the power quality. The performance of the wind turbine and thereby power quality are determined on the basis of measurements and the norms followed according to the guideline specified in International Electro-technical Commission standard, IEC-61400. The influence of the wind turbine in the grid system concerning the power quality measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical behavior of switching operation and these are measured according to national/international guidelines. The paper study demonstrates the power quality problem due to installation of wind turbine with the grid. In this proposed scheme STATic COMpensator (STATCOM) is connected at a point of common coupling with a battery energy storage system (BESS) to mitigate the power quality issues. The battery energy storage is integrated to sustain the real power source under fluctuating wind power. The STATCOM control scheme for the grid connected wind energy generation system for power quality improvement is simulated using MATLAB/SIMULINK in power system block set. The effectiveness of the proposed scheme relives the main supply source from the reactive power demand of the load and the induction generator. The development of the grid co-ordination rule and the scheme for improvement in power quality norms as per IEC-standard on the grid has been presented.
UNDER THE GUIDENCE OF
Mrs. M. KIRAN JYOTHI
Injection of the wind power into an electric grid affects the power quality.
The performance of the wind turbine and thereby power quality are determined on
the basis of measurements and the norms followed according to the guideline
specified in International Electro-technical Commission standard,IEC-61400. The
influence of the wind turbine in the grid system concerning the power quality
measurements are measured according to national/international guidelines.
In this proposed scheme Static Compensator (STATCOM) is connected at a
point of common coupling with a battery energy storage system (BESS) to
mitigate the power quality issues. The battery energy storage is integrated to
sustain the real power source under fluctuating wind power.
Injecting Wind Power into Grid & Improve the
WIND ENERGY GENERATING SYSTEM
It is a system composed of static equipment.
Used to enhance controllability and increase power transfer
It is a regulating device
used on AC
It is based on a
It acts in either capacitive
or inductive mode
WIND ENERGY GENERATING SYSTEM
TYPES OF WIND TURBINES
HAWT have the main rotor shaft and generator at the top of a tower and
must be pointed into the wind.
VAWT have the main rotor shaft arranged vertically .The generator and
gear box placed near the ground.
It is used for the purpose of voltage regulation.
It can be used to level the power fluctuation by charging and
It rapidly injects or absorbed reactive power to stabilize the grid
Without the proper power, an electrical device may
malfunction, not operate at all.
Power quality determines the fitness of electrical
power to consumer devices.
Synchronization of the voltage frequency and phase
allows electrical systems to function properly.
Wind turbine location in power system.
It is based on injecting the currents into the grid using
The controller uses a hysteresis current controlled
The controller keeps the control system variable
between boundaries of hysteresis area.
It gives correct switching signals for STATCOM
Switching signal within a control hysteresis band
o The three phase injected current into the grid from STATCOM will cancel out
the distortion caused by the nonlinear load and wind generator.
o The generation of switching signals from reference current is simulated within
hysteresis band of 0.08..
Performance of STATCOM under load variations
The performance of the system is measured by switching the
STATCOM at time 0.7s in the system and how the STATCOM
responds to the step change command for increase in additional load
at 1.0 s is shown in the simulation.
Three phase injected inverter Current
The compensated current for the nonlinear load and demanded
reactive power is provided by the inverter.
The real power transfer from the batteries is also supported by
the controller of this inverter.
Supply Voltage and Current at PCC.
The source current with and without STATCOM operation is
shown in Fig.
The unity power factor is maintained for the source power
when the STATCOM is in operation.
(a) DC link voltage. (b) Current through Capacitor.
The DC link voltage regulates the source current in the grid System.
The DC link voltage is maintained constant across the
capacitor as shown in Fig.
It is observed that the source current on the grid is affected due to
the effects of nonlinear load and wind generator.
Thus purity of waveform may be lost on both sides in the system.
The power quality issues and its consequences are
STATCOM has a capability to cancel out the harmonic
parts of the load current.
STATCOM maintains the source voltage and current inphase and support the reactive power demand for the
wind generator and load at PCC.
Thus the proposed scheme fulfills the power quality
norms as per the IEC standard 61400-21.
Power system voltage control applications.
Large electric arc furnace installations.
Reactive power compensation applications.
Railway or underground systems with huge load
STATCOM can be replaced with UPQC for better power control.
Replacing the induction generator with doubly fed induction
generator is preferred for better results.
In future the off-shore wind turbines will be implemented due to its
advantages of producing high power.