Date post: | 26-May-2015 |
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IMPROVING GRID POWER QUALITY WITH FACTS DEVICE ON INTEGRATION OF WIND ENERGY SYSTEM
UNDER THE ESTEEMED GUIDENCE OF
“Mr. Amarnath”
BY P. ANVESH
A. SHARMILA M. SIMHACHALAM
S. SIVA KUMAR ANISH MOSANNA
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 guidelines
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 (PCC) with a Battery Energy Storage System (BESS)
to Reduce the Power Quality issues. The Battery Energy Storage is integrated to
sustain the Real Power Source under fluctuating Wind Power.
ABSTRACT
Injecting Wind Power into Grid & Improve the Power
Quality.
OBJECTIVE OF THE PROJECT
BLOCK DIAGRAM
FACTS
STATCOM
WIND ENERGY GENERATING SYSTEM
BESS
COMPONENTS USED IN THE SCHEME
It is a System composed of Static Equipment.
Used to enhance controllability and increase Power Transfer capability.
FACTS
It is a Regulating device used on AC Transmission networks.
It is based on a Voltage-Source converter.
It acts in either Capacitive (or) Inductive mode
STATCOM
WIND ENERGY GENERATING SYSTEM
Load
Kinetic Energy
Mechanical Energy
Electrical Energy
TYPES OF WIND TURBINES
VAWT
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 discharging operation.
It rapidly injects (or) absorbed Reactive Power to stabilize the Grid system.
BATTERY ENERGY STORAGE SYSTEM
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.
POWER QUALITY
Voltage Variation
Harmonics
Reactive Power
Wind Turbine Location In Power System.
POWER QUALITY ISSUES
SIMULATION DIAGRAM
It is based on injecting the currents into the grid using “Bang-Bang controller.”
The controller uses a Hysteresis current controlled technique.
The controller keeps the control system variable between boundaries of Hysteresis area.
It gives correct switching signals for STATCOM operation.
CONTROL SCHEME
SIMULATION RESULTS
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 non-linear load and wind generator.
o The generation of switching signals from reference current is simulated within hysteresis band of 0.08..
CONTINUED…
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.
Performance of STATCOM under load variations
CONTINUED…
Three Phase Injected Inverter Current
The compensated current for the Non-Linear 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.
CONTINUED…
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.
CONTINUED...
(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 theCapacitor as shown in Fig.
CONTINUED…
It is observed that the Source Current on the Grid is affected due to the effects of Non-Linear 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 presented.
STATCOM has a capability to cancel out the Harmonic parts of the Load Current.
STATCOM maintains the Source Voltage and Current in-
Phase 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.
CONCLUSION
Power System Voltage Control Applications.
Large Electric Arc furnace Installations.
Reactive Power Compensation Applications.
Railway (or) Underground Systems with huge Load Variations
APPLICATIONS
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.
FUTURE SCOPE