The document summarizes a guide on using STATCOM for power quality improvement in grid-connected wind energy systems. It discusses: 1) The objectives of the STATCOM control scheme are to maintain unity power factor at the grid side, provide reactive power support to the wind generator and load, and achieve fast dynamic response with a simple bang-bang controller. 2) The STATCOM uses a voltage source inverter to inject current into the grid and cancel out the reactive and harmonic components of the load and generator current, improving the power factor and quality. 3) Test results show the STATCOM is able to mitigate reactive demand and harmonic current, regulating the DC link voltage and maintaining clean source current waveforms

1. GUIDE BY :
Mr. HITESH JAIN (Asst. Professor)
ELECTRICAL DEPARMENT
MITS JADAN,PALI
PRESENTED BY –
Dushyant Trivedi / 4 RD YEAR
DEPARTMENT ELECTRICAL MITS
JADAN PALI

2.  Wind action
 History of wind usage
 Object
 Topology for power qualityimprovement
 Grid connected system forpower qualityimprovement
 Staotcom—performance
 Control scheme
 Staotcom—performance
 Power qualityimprovement
 Applications
 Advantages

3. Wind in action:
When wind strikes an object, it exerts a force in an attempt to move it out
of the way. Some of the winds’ energy is transferred to the object, in this
case the windmill, causing it to move.
Wind Today!!!
Windmills are used for pumping water from deep underground.
Modern wind turbine is the result of design and material advances
made during the 1980s and 1990s, which enabled wind turbines to
become increasingly efficient.
Today, wind turbines are size same as the traditional European
windmill. It can generate 250 to 300 kilowatts of power- a nearly
tenfold increase in efficiency.

5. Blades
Tower
Pitch
Generator
Rotor

6. one of the earliest energy to power boats and grind grain, later to pump
water, press oil, saw lumber and resources.Recorded in history, first make
paper.
Windmills were mentioned at the beginning of Islamic civilization (7th
century).
Windmills were developed in Persia and used paddles made of bundled
reeds.
Egyptians may have been the first to go up the Nile river around 4th
century B.C, powered by wind.
Ancient Chinese used vertical axis windmills to grind grain and pump water.
Windmills were introduced to Europe by the crusaders around 1300 A.D
History of Wind usage:

7.  The proposed STATCOM control scheme for grid connected wind
energy generation for power quality improvement has following
objectives.
•Unity power factor at the source side.
• Reactive power support from STATCOMto wind
Generator and Load.
• Simple bang-bang controller for STATCOM to achieve
fast
• dynamic response.

8.  The STATCOM based current control voltage source inverter injects the
current into the grid in such a way that the source current are harmonic
free and their phase-angle with respect to source voltage has a desired
value.
 The injected current will cancel out the reactive part and harmonic part of
the load and induction generator current, thus it improves the power factor
and the power quality.
 The proposed grid connected system is implemented for power
quality improvement at point of common coupling (PCC), as shown
in Fig below

10.  The battery energy storage system (BESS) is used as an
energy storage element for the purpose of voltage regulation.
 The BESS will naturally maintain dc capacitor voltage
constant and is best suited in STATCOM since it rapidly injects
or absorbed reactive power to stabilize the grid system.
 When power fluctuation occurs in the system, the BESS can
be used to level the power fluctuation by charging and
discharging operation. The battery is connected in parallel to
the dc capacitor of STATCOM.

11.  The shunt connected STATCOM with battery energy storage is
connected with the interface of the induction generator and non-
linear load at the PCC in the grid system.
 The STATCOM output is varied according to the controlled
strategy, so as to maintain the power quality norms in the grid
system
 A single STATCOM using insulated gate bipolar transistor is
proposed to have a reactive power support, to the induction
generator and to the nonlinear load in the grid system

13.  The control scheme approach is based on injecting the currents into
the grid using “bang-bang controller.” The controller uses a
hysteresis current controlled technique.
 Using such technique, the controller keeps the control system
variable between boundaries of hysteresis area and gives correct
switching signals for STATCOM.
 The control system scheme for generating the switching signals to
the STATCOM is shown in Fig.

15.  When STATCOM controller is made ON, without change in any
other load condition parameters, it starts to mitigate the reactive
demand as well as harmonic current.
 The DC link voltage regulates the source current in the grid system,
so the DC link voltage is maintained constant across the capacitor.
 The results of source current, load current are shown in fig. 5(a) and
5(b) respectively. While the result of injected current from STATCOM
are shown in fig.5(c) and the generated current from wind generator
at PCC are depicted in fig.5(d).

16.  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 source current without STATCOM operation is shown in
Fig 6(B). below.The Fourier analysis of this waveform is
expressed and theTHD of this source current at PCC without
STATCOM is 4.06%, as shown in Fig 7(B).

18.  Power system voltage control application
 Large electric arc furnace installation
 Reactive power compensation application
 Railway or underground system with huge load
variation

19.  The wind is free and with modern
technology it can be captured efficiently.
 Uninterrupted power supply.
 Wind power can go anywhere.
 Wind power is cost effective.

20. YOU