The document presents a control scheme for a stand-alone wind energy conversion system, emphasizing its application in remote areas that require constant power due to the depletion of conventional energy resources. It outlines a control strategy using model predictive control to maximize energy conversion efficiency while balancing load demands, highlighting the increasing market potential of wind power. With benefits such as no fuel costs and less environmental impact, the proposed hybrid wind-battery system consists of a wind turbine and a lead-acid battery bank to ensure continuous power supply.

1. Sri Padmavathi Mahila Visvavidyalayam
(Women’s University)
School of Engineering and Technology
Presented
By
CH. Chaitanya Madhu Mallika

2. Control Scheme For a Stand-Alone
Wind Energy Conversion System

3.  Now a days with the competitive costs for electricity generation wind
energy conversion system is deployed for meeting for both grid
connected and stand-alone load demand.
 Small scale stand alone wind turbine provide a very attractive renewable
energy source for off-grid remote applications. It is an advantage of
variable speed turbine technology.
Purpose

4.  There are many loads such as remote villages, islands, ships and so
on that are away from the main grid.
 They require stand-alone generator system which can provide
constant nominal voltage and frequency to provide for their local
electrification.
Problem

5.  Energy is the considered to be the pivotal input for development.
 At present owing to the depletion of available conventional resources
and concern regarding environmental degradation, the renewable
sources are being utilized to meet the ever increasing energy demand.
 Due to a relatively low cost of electricity production wind energy is
considered to be one of the potential sources of clean energy for the
future.
Solution

6. WHY NOW?
 A low power wind system operating in autonomous mode. We present a control
structure that ensures the maximization of wind energy conversion and the
balance between required and produced power.
 The application of the model predictive control (MPC) approach to control
the voltage and frequency of a stand alone wind generation system. This
scheme consists of a wind turbine which drives an induction generator
feeding an isolated load. A static VAR compensator is connected at the
induction generator terminals to regulate the load voltage.
 Wind energy one of the world’s fastest growing energy technologies.
 In order to maximize the efficiency of the renewable energy system it is
necessary to track the maximum power point of the input source.

7. Market Size
 It is estimated that 16% of the world’s electricity will be harnessed from
wind power by 2020.
 The total installed capacity has registered a growth by 20 times from 2001
t0 2010.
 The generation capacity increased from 26000MW in 2001 to 507000MW
in 2010 wind Energy conversion system(WECS) can operate in conjunction
with grid or in isolation, based on this they can be classified as grid
connected or autonomous/stand-alone systems.
 Small wind turbine with capacity ranging from 300W to 25KW are now
available in Indian market and gaining popularity.
 Providing steady income through lease to the land owners .Farmers can also
grow crops or rise cattle next to the towers.

8. Competition
The other renewable source of energy we can use instead of
wind power is solar power.
Competitive advantages
 Solar energy has intermittency issues which is not present in wind
energy. In case of insufficient availability of wind energy backup storage
is utilized for continuous conduction.
 No fuel cost .
 Limited use of land.
 New market.
Operating cost will be less.
Wind energy equipment are not more fragile.
Environment friendly and pollution free.
.

9. Layout of hybrid wind–battery system for a stand-
alone dc load.
Architecture

10. Control strategy for stand-alone hybrid wind battery system
Hybrid wind battery system for an isolated
dc load:
 The proposed hybrid system comprises of a 4KW Wind Energy Conversion
System(WECS) and 400Ah,c/10lead acid battery bank.
 However, there is a need for battery back up to meet the load demand
during the period of unavailability of sufficient wind power.
 Charge control for battery bank
The current required for charging the battery bank depends on the
Battery State Of Charge(SOC).
 Control Strategy
A. MPPT Logic
B. Tip Speed Ratio(TSR)
C. PI Controller

11. Block Schematic of the Charge Controller Circuit for Battery.

12. Constant Voltage(CV) Mode of Charging
Constant Current(CC) Mode of Charging
Pitch Control Mechanism
Pitch Control Scheme
Modes of Battery Charging:

13.  Price:
Turbine 3,00,000
Control circuits 2,00,000
Mechanical Devices 2,00,000
Battery 1,50,000
Converter 10,000
Total Estimated Costs 8,60,000
 Life Time:
Minimum 20 years
 Customers:
Telecom Stations
Revenue

14. Board of Advisors
CH.Chaitanya Madhu Mallika
K.Bhavani
R.Harika
N.Kalpana
Founder
MS.M.Pallavi

15. THANK
YOU…!!!!