1. ANALYSIS OF ELECTRONIC LOAD CONTROLLER
FOR THREE PHASE SYNCHRONOUS GENERATOR
USING FUZZY LOGIC
Presented by:
ANURAG YADAV
Masters of Technology
Indian Institute of Technology Roorkee

2. INTRODUCTION
 Energy is the basic requirement for economic development
 Mainly Coal, Petroleum, Natural gas, nuclear etc. are used to be
exploited as versatile and high quality energy products
 Utilities in many developing countries are finding it difficult to
establish and maintain remote rural area electrification and other
needs
 The cost of delivering power to such areas is becoming excessively
large due to large investments in transmission lines and large
transmission losses
 For these reasons, many utilities are seriously considering local
renewable energy resources as an alternative to meet the load demand

3. ADVANTAGES OF HYDROPOWER
 Clean energy source
 Renewable source as it doesn’t utilize any fuel
 Environment friendly
 Easily integrable with grid and other energy
sources and can easily meet peaking demands
 Very high conversion efficiency

4. OBJECTIVES
To develop the model of ELC in MATLAB/Simulink
To simulate the model and analyze it for various operating
conditions
Interpretation of the results obtained through simulation

5. SCHEME OF ELC
ALTERNATOR ELECTRONIC LOAD
CONTROLLER
CONSUMER LOADS
BALLAST/DUMP
LOAD

6. ADVANTAGES OF ELECTRONIC
LOAD CONTROLLER
 Reduces the cost of Small Hydro installation
 Provides smooth control of Voltage and Frequency
 Efficient than a conventional hydraulic governor as it is faster
in response
 No complications and maintenance is very less
 Maintains constant load on the generator irrespective of
consumer load variations

7. SYNCHRONOUS GENERATOR
 It works on the principle of electromagnetic induction
 It runs at synchronous speed which is fixed by the line frequency and no. of
poles
 It can both export or import reactive power depending upon the type of
excitation
 Stable in operation and control
 They are of Salient-Pole type or Cylindrical rotor type
 In hydropower plants, Salient Pole Synchronous Generators are employed

8. SYNCHRONOUS GENERATOR

9. Droop Characteristics of two different Alternators

10. LITERATURE REVIEW
AUTHOR(s) TOPIC WORK AND RESULTS
Jan Portegijs[1]
2000
The Humming Bird
ELC/Induction
Generator
• The humming bird ELC for both single phase and three phase Induction generator is being
developed.
• Thyristorized control has been used to control the dump power consumption with two ballast
loads.
• Design considerations for building and troubleshooting an ELC were described.
• Design is quite simple but its major disadvantage is the electronic noise which is due to the
phase angle control strategy employed.
Arun Kant [2]
2002
Design and
development of a
controller for Single
Phase Induction
Generator
• A design for load controller for Single-phase Induction Generator is developed.
• A circuit for sensing the reference and actual frequency has also been developed.
• Hardware of ELC has been developed using IC 555 timer utilizing the solid state electronic
devices and circuits.
• Under-voltage,Overvoltage,Over-speeding protections are also being incorporated in the
model.
• The model provides quite smooth control of voltage and frequency
S.S. Murthy,et al.
[3]
2003
Field experience on a
novel pico hydel
system using SEIG and
ELC
• The field experience is being done by exploiting locally available small hydro potential
needing minimal civil works
• Water is made to flow in a channel and stored in a forebay tank whose discharge is regulated
to have nearly constant head.
• Thyristor based, diode based, Mark-space ratio/PWM based ELC’s were developed and these
are being compared for their voltage regulation.
• IGBT based ELC is being found to yield the best performance.

11. V. Aggarwal [4]
2004
Techno-economic study of micro
hydro-turbine governing systems
• Study is being carried out keeping in mind the economic aspects of the turbine
governing system.
• It is being concluded that the cost of penstock of ELC based system is less as the flow
is constant.
• Constant flow condition also eliminates the water pressure or surge pressure.
• It also eliminates the use of regulating equipment like guide vanes which further
adds to cost reduction.
S.P. Singh [5]
2004
Design and development of
single phase ELC for micro hydro
power plant
• Worked and designed an ELC for a single phase system.
• Design consistes of an uncontrolled rectifier in series with chopper switch (IGBT)
which is given pulse signal by PWM controller to control the switching.
• Voltage and frequency are thus controlled and regulated.
S. Singh[6]
2006
Design, testing and sensitivity
analysis of ELC
• ELC is designed using phase angle regulation scheme which can vary from 0 to п.
• The ELC is being made for single phase system and back to back thyristors are being
used in its design as it can be operated in both directions.
• Switching occurs at twice the frequency and thus generates harmonic distortion as
high as 35-40%.
• The results show that design is succesful for single phase system and that too upto
7kW.
B. Singh[7]
2006
Analysis and design of ELC for
SEIG
• ELC is being designed for stand-alone operating mode.
• Uncontrolled rectifier and chopper based ELC is being developed with resistive dump
load.
• IGBT is being used as a chopper switch.
• It is being concluded from transient and steady state waveforms that ELC is able to
maintain constant voltage and frequency. This type of ELC can handle large power as
compared to single phase one.
S.S. Murthy, et
al[8]
2006
A Novel Digital Control Technique
of Electronic Load Controller for
SEIG Based Micro Hydel Power
Generation
• The work presents both transient and steady-state analysis of ELC
• The operation of ELC is controlled using digital controller.
• The controller is being tested in both laboratory and field.
• This design of ELC is found to be more effective, faster, reliable, compact and cost-
effective.

12. J.M Ramirez, et
al[9]
2007
An Electronic Load
Controller for Self-Excited
Induction Generator
• The proposed ELC is reliable, simple and injects fewer harmonics.
• The proposed ELC is conformed by a per-phase chopper circuit in series with dump load
• Each switch is a combination of a couple of IGBT in anti-parallel connection.
• The commutation pulses are obtained by PWM technique.
D.K. Palwalia, et
al[10]
2008
Voltage and Frequency
regulation of single phase
SEIG
• ELC is being developed for single phase two-winding squirrel cage induction motor
working as SEIG.
• The error is generated based on the voltage difference between the actual and the
reference.
• The error signal is compared with internally generated triangular wave of PWM
generation scheme which generates the pulses for firing the IGBT through an opto-
isolation and pulse driver circuit.
B. Singh, et al [11]
2008
VSC with Star-Delta
Transformer based
Electronic Load Controller
for a stand alone power
generation
• The proposed scheme presents an asynchronous generator driven by a pico hydro
turbine and controller is connected at a point of common coupling through interfacing
transformers.
• A star-delta transformer is used to form a four wire topology. It provides path to zero-
sequence component of load current.
• Transformer is of three winding type with turns ratio as 2:2:1.
• ELC serves the purpose of harmonic elimination, load balancing and reactive power
compensation for voltage control.
• The results show that three phase system is balanced and sinusoidal.
B. Singh, et al [12]
2008
Power Quality improvement
in Conventional ELC for
isolated power generation
• The designed ELC scheme consists of a 24-pulse rectifier with 14 diodes and a chopper.
• A polygon wound autotransformer is being employed with reduced kVA rating for 24
pulse rectifier for harmonic reduction and to meet the power quality requirements as
prescribed by IEEE standard-519.
• ELC’s are being developed using two schemes viz. six pulse bridge type and 24 pulse
bridge type.
• The performance of both designs are being compared and it is concluded that 24 pulse
bridge type ELC yields better performance.
• Experimental validation of the design has also been done.
B. Singh, et al[13]
2008
Zig-zag transformer based
ELC for isolated
Asynchronous generator
• In this scheme, the VSC(Voltage source converter) and a zig-zag transformer are
connected in shunt with the stator terminals of the generator.
• The neutral terminal for the consumer loads is created using a zig-zag transformer.
• Two legs of the VSC are connected to the two phases while third phase is connected at
the mid-point of the DC bus capacitors of the VSC.
• The cost, complexity, of ELC is less as compared to other ELC’s for four wire topology.

13. H. Ludens[14]
2010
Electronic Load Controller
for Micro-hydro system
• The ELC is being developed for a single phase system.
• The power circuit consists of eight TRIACs
• It also employs a power transformer consisting of two secondaries.
• One of the secondary is utilized to feed the line frequency and the other one to power
the control circuitry of thyristor.
• ELC based on this scheme gives satisfactory performance.
V. Rajagopal [15]
2010
Electronic load controller for
isolated asynchronous
generator in pico
hydropower generation
• The work proposes a digital signal processor based ELC for asynchronous generator.
• The control circuitry consists of excitation capacitors, voltage source converter, dc link
capacitor, a chopper, star/delta transformer, consumer loads and an auxiliary load.
• The system provides a viable and cost effective solution to achieve power quality
improvement, voltage and frequency control, harmonic suppression and load balancing
for feeding non-linear loads.
Anurag Chauhan
[16]
2010
Transient analysis of self-
excited induction generator
• The ELC is being simulated for transient conditions such as process of self-excitation,
voltage build-up, faults, unbalanced excitation, switching of resistive and dynamic loads.
• SEIG can safely feed an induction motor rated upto 50% of its rating.
• Three-phase fault, L-L fault and unbalanced excitation cause voltage collapse and de-
excitation.
• The dynamic behaviour of SEIG with ELC is satisfactory in constant power applications.
Shalini Singh[17]
2010
Design and testing of ELC for
hydropower plant
• The ELC in this scheme is designed and fabricated using thyristors.
• The input is taken from generator through step down transformer and using the control
circuit, the triggering pulses are fed through the pulse transformer for gating the
thyristors.
• The ELC is tested and shows that it is capable to maintain almost constant voltage.
S.N. Mahato, et
al[18]
2010
Transient performance of a
three-phase SEIG supplying
single phase load with ELC
• The work presents an SEIG feeding a single phase inductive load.
• The effect of cross-saturation has also been incorporated.
• The developed model has been validated through experiment by sudden removal and
application of load so as to check the effectiveness of the model.

14. S. Gao, et al[19]
2010
Design of a Microcontroller
based ELC for SEIG supplying
Single Phase Loads
The ELC has been designed using Microprocessor interface.
The ELC is an intelligent sensor in this case
The operation of the controller is fast and also smooth and reliable control is obtained.
B. Singh, et al [20]
2011
Electronic Load Controller
for a Parallel Operated
Isolated Asynchronous
Generator Feeding Various
Loads
The ELC is developed for induction generator operating in stand-alone mode.
The model is simulated for linear/non-linear, balanced/unbalanced loading conditions.
The controller is PI based.
B. Singh, et al[21]
2011
Neural-Network-Based
Integrated Electronic Load
Controller for Isolated
Asynchronous Generators in
Small Hydro Generation
The work proposes a neural-network based integrated ELC for isolated asynchronous
generator feeding a three-phase four wire load.
The scheme uses adaptive linear element to extract the fundamental component of load
current to control the voltage and frequency.
The IELC is realized using zigzag/three single-phase transformers and a six-leg insulated-
gate bipolar-transistor-based current controlled voltage-source converter, a chopper
switch, and an auxiliary load on its dc bus.
The model was simulated and also validated and found to give satisfactory performane.
The controller is also simple, easy to control and less sensitive to load perturbations.
V. Rajagopal[22]
2011
Improved ELC for offgrid
Induction Generator in SHP
generation
ELC is being implemented using a digital signal processor.
The design also balances the system under unbalanced loading conditions and also
eliminates the harmonics in the load.
THD of load current and terminal voltage lies within 5% as prescribed by IEEE-519
standard.
Performance is very good under non-linear and unbalanced loading conditions.
Anjali Garg, et al
[23]
2011
A Fuzzy Logic Based
Electronic Load Controller
for Self-excited Induction
Generators
The proposed scheme presents a fuzzy logic based ELC for asynchronous generator.
The load current is being compared with the reference current and based on the error
signal the input goes into Fuzzy logic controller.
The proposed ELC gives better performance as compared to conventional controllers due
to the use of fuzzy logic scheme.

15. Dibyendu Das[24]
2011
Steady-State analysis of
Electronic Load Controller
for Three Phase Alternator
• The ELC is being developed using PD, PI and PID controller techniques.
• The performance of ELC based on the three techniques is being compared and the
effect of varying the proportional, derivative and integral gain constants is also
discussed.
• It is being concluded that PID based controller gives better performance as compared to
other two.
• The system is not state controllable but the output is controllable as desired.
Érika S. Melo, et al
[25]
2013
Electronic Load Controller of
a Micro-Hydro generator for
stand-alone operation
The proposed scheme presents an ELC for single phase permanent magnet synchronous
generator operating in isolated mode.
A switched binary-weighted ballast load is connected in parallel with the main load.
Binary-weighted resistors consists of six resistors connected in series.
Each switch is triggered in integer cycles and on/off combinations provide 64 options of
equivalent resistances that vary linearly.
Comparison is being done between actual and reference frequency.
The controller employed here is of PI type.
Better results can be obtained by connecting more resistors to the ballast load.
Peeyush Kala[26]
2013
Steady-state analysis of
Fuzzy logic based ELC for
SEIG
• In this scheme, fuzzy logic based ELC is being developed for self-excited induction
generator.
• The model is simulated in MATLAB/Simulink environment.
• The error signal is fed to the fuzzy logic controller based on the comparison between
reference voltage and actual voltage.
• The results show that a better and quick restoration of the system takes place with
Fuzzy logic based controller.
Yellaiah. Ponnam
[27]
2013
ELC for SEIG using fuzzy logic
controller
• The proposed scheme consists of a Fuzzy logic based controller for SEIG operating in
isolated mode.
• The error signal is generated by the comparison between the actual voltage and the
reference voltage.
• Fuzzy logic based ELC gives faster response and the peak overshoot is also reduced.

16. C.Kathirvel, et al
[28]
2013
Fuzzy logic based voltage
and frequency of a self
excited induction generator
for micro hydro turbines for
rural applications
• The ELC based SEIG has been designed in this work.
• The design is being tested using simulation in MATLAB/Simulink.
• It is concluded that STATCOM or any other reactive power supply device needs to be
integrated with fuzzy in order to keep the voltage perturbations within safe limits.
B. Nia Roodsari , et
al [29]
2014
The Distributed Electronic
Load Controller: A New
Concept for Voltage
Regulation in Micro hydro
Systems with Transfer of
Excess Power to Households
• The work presents a concept of distributed ELC.
• The power going as a waste or dump to ballast load is utilized in various household
usage nearby.
• This scheme provides good regulation of voltage and frequency.
• The results showed that distributed ELC has more reliable performance than a
conventional one.
M. Prabhu Raj, et
al[30]
2014
Fuzzy Logic Control Strategy
for Stand-Alone Self-Excited
Induction Generator for a
Variable Speed Wind Turbine
• The work presents a control strategy for SEIG connected to wind turbine and operating
in isolated mode.
• The strategy aims to extract the maximum energy from the turbine and simultaneously
regulating the terminal voltage over a wide range of speed variations.
• The dynamic performance is achieved using three fuzzy logic controllers.
B. Nia Roodsari , et
al [31]
2014
A New Electronic Load
Controller for the Self-
excited Induction Generator
to Decrease Stator Winding
Stress
• In this technique, a part of the dump load is being connected vin parallel with the
consumer load so that stress on the stator windings can be reduced.
• The duty cycle varies with the variations in main load, which requires constant
connection and disconnection of the ballast load.
• In the proposed scheme the ballast load has been divided into two parts for the reasons
explained above.

17. GAPS IDENTIFIED
 Fuzzy logic based ELC can be developed for Synchronous
Generator
 State space models for the controllers may be developed
 Analysis can be done for inductive dump load
 The Fuzzy logic based ELC can be integrated with
microcontroller so as to improve the design
 The controller can also be developed using Artificial Neural
Network, Neuro-Fuzzy technique

18. FUZZY LOGIC
 Fuzzy logic is a multi-valued logic that deals with approximate rather than fixed and
exact reasoning
 Fuzzy logic variables may have a value that ranges between 0 and 1
 It gives the freedom to use linguistic variables where the degree of truth or falsehood is
determined by defining the membership functions
 It gives a convenient way to map an input space to an output space
 It consists of a fuzzy inference system, rule editor, membership function editor and
surface viewer
 Fuzzy logic is robust, can be easily modified, use multiple inputs and outputs, gives
faster response compared to other controller
 Fuzzy logic is utilized practically in various day to day applications like washing
machine control, temperature control, water level control etc.
Fuzzification
Fuzzy
Inference
System
Defuzzification
Rule Base
Membership Functions
Crisp Values Crisp Values

20. DESIGN OF THE PROPOSED
MODEL

21. SIMULINK MODEL

22. Circuit Diagram of Three Phase uncontrolled rectifier

23. Conduction Table for rectifier operation

24. Waveforms pertaining to Uncontrolled Rectifier

25. DESIGN PARAMETERS OF THE CONTROL
CIRCUIT

27. RULE VIEWER AND SURFACE VIEWER
AT A GLANCE

28. SIMULATION RESULTS

29. SUDDEN LOAD APPLICATION

33. FIXED INITIAL LOAD

36. RESULTS & DISCUSSION
There is a sudden drop in the voltage due to sudden application of such a large load
There is an abrupt rise in the stator currents up-to 1.75pu due to sudden application of such a large
load. However, there is a slight departure of stator currents due to the use of uncontrolled rectifier.
 The speed drops suddenly below 0.99pu as shown in Fig. 4.5. There is also a transient at 0.1
second in the power dumped which finally settles down to a steady-state value of 10kW.
Voltage rises initially beyond 1pu and in about 0.2 seconds it settles to 1pu.
Stator currents shoot up beyond 1pu initially but settle to 1pu in about 0.1 second
As the generator is loaded up to its rated capacity, there is an initial transient in the power dumped
which reduces to zero after sometime
The speed contains lesser number of transients as compared with the case of sudden load
application

37. CONCLUSION
Small change in speed/frequency of the system has been observed but the variation is
within the safe limits. The current and voltage waveforms are slightly distorted due to
the use of uncontrolled rectifier
The frequency ,voltage and other parameters of the alternator are restored in a very
short duration
Lesser transients and overshoots are there due to the fuzzy logic based controller
design and the operating parameters get restored to their normal values in a very short
duration
Fuzzy logic controller based on ANN technique thus proves to be a strong candidate
for designing the electronic load controller as compared to other conventional
controllers
With the help of fuzzy logic controller, it is possible to control the sophisticated
systems without the inclusion of complex mathematical equations

38. FUTURE SCOPE
State space model can be developed for PI and PID based controllers
Controller design can be improved by using neuro-fuzzy or other artificial
intelligence control tools
 STATCOM can also be integrated with ELC for reduction in the harmonic content
of the rectified voltage for better regulation
The design can be practically developed and validated for the results in the
laboratory
Analysis can be done for inductive dump load
A comparative study can be done for the ELC design based on PI, PID, PD and
artificial intelligence techniques

39. LIST OF PUBLICATIONS
 Steady-State Analysis of Electronic Load Controller for Three Phase Alternator, "12th
IEEE India International Conference", INDICON,December 2015
 A comprehensive MATLAB GUI approach for performance analysis and evaluation of
saturated magnetizing reactance and frequency of three phase SEIG,"12th IEEE India
International Conference", INDICON, December 2015
 A Fuzzy logic based Electronic Load Controller for three phase alternator, “International
Journal of Emerging Technology and Advanced Engineering", Vol.5, Issue 3, March 2015,
pp. 514-520
 Electronic Load Controller as a Modern Governing Mechanism: A Review, “International
Journal of Emerging Technology and Advanced Engineering”, Vol. 5, Issue 6, June 2015,
pp. 218-225
 A Novel MATLAB GUI based performance analysis of three phase SEIG, “International
Journal of Emerging Technology and Advanced Engineering", June 2015

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