Power quality improvement of Distribution lines using DSTATCOM ...
Application of Ann Controller in a Dstatcom
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APPLICATION OF ANN CONTROLLER IN A DSTATCOM
ANIL K.DAHIYA G.SIVA VIKRAM YADAV
Asst. Professor Roll No: 208249
Electrical engineering Dept MTECH.-PED
NIT Kurukshetra-136119 Electrical engineering Dept
Haryana-136119 NIT Kurukshetra
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CONTENTS1.power quality2. Facts & controllers3. D-STATCOM4. PI5. ANN6. Analysis of distribution system7. Modeling of distribution system8. Simulation results9. conclusion
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1.Power Quality
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1
POWER AND QUALITY
POWER QUALITY ISSUESPOWER ELECTRONIC LOADS NONLINEAR LOADS CRITICAL LOADS
HOW TO SOLVE THE PQ PROBLEM?
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3.FACTSWhat is FACTS?
2
FACT Device evolution?
Different Fact Devices
Fact Controllers
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Different FACT devices and performance
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4.D-STATCOMRole of D-STATCOM?
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Working principles?
Controller Techniques
Operating modes?
SVpwm controlling technique. SRF controlling technique.
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CONTENTS
Fig4.1.Single line diagram of DSTATCOM
Fig4.2.Equivalent diagram of DSTATCOM
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XCV
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Pwm effect on VSC 3 phase Ac sinusoidal output output
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D-STATCOM (formulae)
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P=(2V2 /X) sin(δ/2)
Q=(2V2 /X) [1-cos(δ/2)]Vs
Vr
δ
IX
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PID Technology
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Invention of Artificial Neural Networks?
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What is a neuron, neural network?
Different ANN models?
Feed-Forward Neural NetworksFeed-back Neural NetworksRecurrent Neural Networks
ARTIFICIAL NEURAL NETWORKS
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ANN ARCHITECTURE
Dendrites
Soma (cell body)
Axon
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Architecture
synapses
axondendrites
Interconnection of 2 neurons (schematic diagram)
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2
z z
Linear activation
Threshold activation Hyperbolic tangent activation
Logistic activation
u
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eutanhu
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2
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1
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1 zz
e
1, 0,sign( )
1, 0.
if zz z
if z
z
z
z
z
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-1
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Σ
Σ
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LEARNING METHODS
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TYPE OF ARCHETECTURE
GRADIENT DESCENT HEBBIAN
SINGLE LAYERFEEDFORWARD
ADALINE, HOPFIELD HOPFIELD
MULTI LAYER FEEDFORWARD
CCN,MLFF,RBF
NEOCOGNITRON
RECURRENT NEURAL N/W
RNN BAM, BSB, HOPFIELD
Fig. Multilayer feed forward neural network
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GRADIENT DESCENT (training example) N+1 --------------- iteration t------------------target output value η-----------------learning rate intialize each weight unit to some random value(0.5 to -0.5) Untill termination condition is met,
1. For each (x,t) vector intraining samples.
2. Input the instance ( x) vector to s unit weight calculation and compute the output “o”.
3. For each linear unit weight Wi,
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➲ Squared Error Above it has mentioned, that the whole learning
process is in order to reduce the error, but how can man error describe? Generally the function squared error is used.
Notice: this function sums all the error over all of the networks output units after a whole set of training examples has been computed.
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then the value-vector can be updated by:
– where E(~w) is the gradient of E:∇
so for each value k can be updated by:
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But in practice, because the function sums all the error over a whole set of the training data, so need the algorithm with this function more time to compute, and can easily be effected by local minimum, so construct man a new function, named stochastic squared error:
As can be seen, the function computes error only about a example. The gradient of Ed(~w) is easily made out:
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How to improve the gain performance of controller?
+
+
+
-
-
-
x1
x2 x2
x1
+ -
- +
This...
PI Controller performance
input
output
input
output
PI
ANN
Improving performance of Controller
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Building a ANN controller using MATLAB Simulink
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Training a ANN controller using MATLAB Simulink, NNTool
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Extracting a ANN controller using MATLAB Simulink, NNTool
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7.Analysis of Distribution System
Essential parameters:
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Single line diagram of D-statcom
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Per Unit scaling
Claculated values:
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VSC CIRCUIT SPECIFICATIONS
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Modelling a Dstribution System
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CONTENTS
mH
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FIG2.ANN CONTROLLER CONGIGURATION
FIG1.PI CONTROLLER CONGIGURATIONS
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TABLE: PI CONTROLLER SPECIFICATIONS
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D-STATCOM DATA SPECIFICATIONS
700kw
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Simulation Results VBUS1 PERFOMANCE VBUS3 PERFORMANCE
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S
a
g
SW
E
L
L
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CONCLUSIONTYPE OF MODE %VOLTAGE REGULATION
Uncompensated 20%
Compensated using “PI controller” 10%
Compensated using “ANN controller” 5.8%
Fast acting, better voltage Regulation, Reactive power compensation performance by ANN based controller compared to PI Based controller
In a Dstatcom
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REFERENCES
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Thank you for your listening
ANY QUERIES PLEASE?