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International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 843
Comprehensive Analysis on Optimal Allocation and Sizing of
Distributed Generation Units using Particle Swarm Optimization
Technique
Abdulhamid Musa
Electrical and Electronic Engineering Department, Petroleum Training Institute, Effurun, Nigeria.
---------------------------------------------------------------------***----------------------------------------------------------------------
Abstract - This paper investigated an optimal allocation
and sizing of distributed generation (DG) comprehensively
using Particle Swarm Optimization (PSO) algorithm. The
objective function of thisstudyistominimizevoltagedeviation
(VD) and total power loss in a radial distributionsystem. A33-
bus radial network is used to demonstrate the effectiveness of
the proposed algorithm. The result shows the weakest voltage
level occurs at bus 18 with 0.8981pu. However, with the
allocation of 3 DGs, the percentagevoltageperformanceyields
a maximum of 20.19% at bus 22, followed by 19.44% and
17.71% at bus 2 and bus 21 respectively. Thus, bus 19 has 0%
voltage performance as expected where it has minimum
voltage deviation. The PSO results also indicate the optimal
allocation of DG units at bus 18, 14 and 17 with corresponding
DG sizes of 1.7154MW, 0.1908MW and 1.6159MW. The
analysis shows 89.83% reduction of total power loss in the
distribution system. Finally, the algorithm has achieved its
objectives by using Type I DG and demonstrates that PSO is an
effective method for solving problems concerning an optimal
sizing and locating of DG for minimizingvoltage deviation and
total power loss in the distribution system.
Key Words: Distributed Generation, Particle Swarm
Optimization algorithm, Total Power Loss, Voltage
Deviation, Voltage Profile.
1. INTRODUCTION
The complexity of power system makes its operation very
complicated on considering a high demand for electricity
supply and load density. The primary cause ofuncertainty in
power system planning is the load demand which is
originated due to the variety of electricity supply need from
a different class of customers [1]. In such circumstances,
there is usually voltage profile degradation, and the voltage
profile of a distribution system get reduced as it gets away
from the sub-station [2]. Thus, this necessitated delivering
electrical power over long transmissionanddistributionline
to meet the ever increase of energy demand [3, 4]. Many
conventional ways of electricity generation use primary
sources of energy that are non-renewable and as such their
exhaustiveness in nature. This calls for theuseof distributed
generation (DG) and the use ofDGtechnology.DGsystem isa
part of smart grid concept which is currently forming the
backbone of a modern distribution system. The DG can,
however, be renewable energy source (RES) like
photovoltaic, wind turbines, small hydro, biomass etc. or
fossil fuel based sourcessuchasinternal combustion engines
(IC), combustion turbines and fuel cells [5].
Several studies provide benefits of DG in terms of their
integrating and modular nature in a competitive electricity
market environment. These benefits include power loss
reduction [1, 6-11], voltage profile improvement [1, 4, 6, 8,
9], reliability [1, 6-8, 11-13], short lead time and low
investment risk [14], relieved transmission and distribution
congestion [7], peak demand loss reduction [4], energy loss
reduction [4], frequency improvement [7], power factorand
stability improvement [4], increase the distributioncapacity
[8], reduced emissions of pollutants [7, 13] in a distribution
system. The contributions to achieving solutions for
optimization problems of optimal allocation of DG are
reviewed in the following item.
1.1 Literature Review
There are several methods proposed in solving an
optimization problem in terms of optimal locationandsizing
of DG, which can either be conventional or stochastic search
algorithms. Example of the traditional technique includes
analytical way by exact loss formula [15], a study devoid of
bus impedance matrix [16], analysis based on load
concentration factor [17], Power Voltage Sensitivity
Constant method [18], etc. It is evident from the literature
[19] that the conventional orclassical methodofanalysishas
the disadvantage of finding the optimal solution for the
nonlinear optimization problems. DG allocation is a
nonlinear optimization problem where traditional
optimization techniques are not appropriate for solving.
Additional issue is the consideration of a criterion to decide
whether a local solution is also a global solution. The advent
of stochastic search algorithms has provided alternative
approaches for solving optimal DG allocation problems.
These population-based techniques exterminatemostofthe
difficulties of classical methods. Many of these stochastic
search algorithms have already been developed and
successfully implemented to solve optimal DG placement
problems [20].
Appropriate sizing and allocating of DG will reducetotal loss
and increase the overall performance of the distribution
system. However, improper DG placement and sizing may
affect the DG’s benefits negatively such as an increase in
system power losses and costs [1, 3, 21-23],whichcaneither
be in a steady state or dynamic form [24]. Thus, the
allocation of DG unit in a best place and preferable size in
distribution systems are categorized as a complex
combinatorial optimization problem [25]. Previous studies
have reported different optimization techniques to solve
optimal allocation and sizing of DG units for different DGs’
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 844
issues. For instance, an Adaptive Quantum-inspired
Evolutionary Algorithm (AQiEA) [21],Feasibility-Preserving
Evolutionary Optimization [6], Genetic Algorithm (GA) [4,
26], Dragonfly algorithm [7], Firefly algorithm [27], Chaotic
stochastic fractal search algorithm [28], Crow Search
Algorithm [29], Nature Inspired Algorithms [30], Particle
Swarm Optimization (PSO) Algorithm [31, 32], artificial
immune system (AIS) [33], Multi-objective Evolutionary
Algorithm with Tables (MEAT) [34], Ant Lion Optimization
algorithm (ALOA) [35], Modified Shuffled Frog Leaping
optimization Algorithm (MSFLA) [36], bacterial foraging
optimization [37], Bat-inspired algorithm [38], Social
Learning Particle Swarm Optimization (SLPSO) algorithm
[39], Bat-inspired algorithm [40], Chaotic Artificial Bee
Colony (CABC) algorithm [41], Cuckoo Search Algorithm
(CSA) [42], Differential Evolution (DE) [43], Evolutionary
Programming (EP) [44], and Gravitational SearchAlgorithm
(GSA) [23].
However, the algorithms mentioned above have examined
different test cases with different types of DG units for the
objective function. Type I to type IV DGs are identified by
researchers in [3, 8, 11, 14, 45-47] where in type I - the DG
inject active power and operates at unity power factor; type
II – the DG injects reactive power; type III – the DG injects
both kW and kVAr such as synchronous machines, and type
IV – the DG consume reactive power but injecting active
power like in induction generators, respectively.
This paper utilizes the PSO technique to obtain the optimal
size and location of three DGs in a distribution network with
objective function of improving voltage profile, minimizing
voltage deviation and reducing total power loss of a
distribution system.
2. PROBLEM FORMULATION
One of the primary emphasisconcerning a DGplacementand
sizing is to minimize voltage deviation and also reduce the
active power loss.However, optimal solutionsmayfacesome
technical and geographical issues. An alternative solution is
to find the optimal DG location and the corresponding
minimum size required to achieve a certain planned power
loss [48]. The distribution system Power losses have always
been an essential issue due to the energy efficiency and the
costs for electricity supplies [40].
2.1 Objective function
The objective of the optimal size and location of DG problem
using PSO is to increase voltage profile and minimize the
total active power loss of the distribution system subject to
constraints.
2.1.1 Power loss minimization
(1)
Where i is the branch number, n total number of branches
and Ii is the ith active current.
2.1.2 Voltage Deviation (VD)
The objective function to improve voltage profile involves
computation of voltage deviations as in Equation 1.
(2)
2.1.3 Percentage voltage performance (PVP)
This is the ratio of the difference between VD at base and VD
at DG to VD at base and is given by equation 2.
(3)
2.1.4 Constraints
Bus Voltage Limits: System’s voltage limitsareconsidered to
be +5% of the nominal voltage value, (Vi).
0.95  Vi  1.05 (4)
DG constraints: This is a DG size (PDG) limit between the
maximum and minimum capacity. Since type I DG is
considered for this study, only active power limit is
provided. Thus,
1kW  PDG  2MW (5)
3.PARTICLE SWARM OPTIMIZATION (PSO)
ALGORITHMS
Particle swarm optimization (PSO) algorithms are nature-
inspired population-basedmetaheuristicalgorithms [40,49-
52]. These algorithms mimic the social behavior of birds
flocking and fishes schooling. The benefits ofParticleSwarm
Optimization over other conventional techniques include:
i. PSO is based on the intelligence [46, 52].
ii. PSO requires few particles to beregulated.Thesearch
can be carried out by the speed of the particle [46,
50, 52].
iii. PSO gives faster convergence to a solutionclosetothe
optimal [46, 49, 50].
The main steps in PSO algorithm implementation [53] is
given as
Initialize Population
repeat
Calculate fitness values of particles
Modify the best particles in the swarm
Choose the best particle
Calculate the velocities of particles
Update the particle positions
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 845
until requirements are met.
4. Simulation Results and discussion
To appraise the performance of PSO algorithm in the
application of DG planning problem, the 33-bus radial
distribution system is simulated using MATLAB 2016a
software. The PSO is used to find the optimal location and
sizing of DG for the minimization of voltage deviation and
total loss of the network.
4.1 The 33-bus distribution system
The single line diagram of 33-bus system [54] is shown in
Figure 1. The system voltage is 12.66 kV and total system
active loads are 3715 kW. This test system consists of 33
buses and 32 branches.
Fig – 1: Single line diagram of 33-bus distribution system
4.2 Established objective function
Like any other metaheuristic algorithm, PSO’ s performance
is dependent on the values of its parameters. Therefore, the
PSO parameters used for this study are used as follows:
number of populations is set to 50 and maximum number of
iterations is set to 100. The acceleration constant = 0.1, the
Initial inertia weight = 0.9 and final inertia weight = 0.4. The
minimum global error gradient = 1e-10.
The convergence characteristics forthesimulationisplotted
on Figure 2. the figure shows the effectiveness of the choice
of the proposed PSO technique in avoidance of premature
convergence.
0 10 20 30 40 50 60 70 80 90 100
Iteration
0
10
20
30
40
50
60
ObjectiveValue
PSO Algorithm
Fig – 2: The PSO convergence characteristics
4.3 Voltage deviation without and without DG
allocation.
The values of base voltage and the voltage with the
allocation of three DG units using PSO technique are
arranged in table 1. The bus 1 has maximum potential of 1pu
and seconded with bus 22 that has 0.99pu. The base voltage
recorded its weakest voltage level at bus 18 with 0.8981pu.
However, with the allocation of 3 DGs at bus locations 18,14
and 17, the voltage deviation of each bus has changed with
an exception of bus 1 and bus 22.
Table -1: Voltage deviation without and with DG of 33-bus
system
Bus
number
Base
voltage
(pu)
Volt
with DG
(pu)
Base
voltage
deviation
Volt with
DG
deviation
1 1.000 1.000 0.000 0.000
2 0.996 0.997 0.004 0.003
3 0.980 0.981 0.020 0.019
4 0.971 0.972 0.029 0.028
5 0.962 0.964 0.038 0.036
6 0.941 0.942 0.059 0.058
7 0.937 0.938 0.064 0.062
8 0.931 0.933 0.069 0.067
9 0.924 0.926 0.077 0.075
10 0.917 0.919 0.083 0.081
11 0.916 0.919 0.084 0.082
12 0.914 0.917 0.086 0.083
13 0.907 0.910 0.093 0.090
14 0.904 0.908 0.096 0.092
15 0.903 0.906 0.097 0.094
16 0.901 0.905 0.099 0.095
17 0.899 0.903 0.101 0.097
18 0.898 0.903 0.102 0.097
19 0.996 0.996 0.004 0.004
20 0.991 0.993 0.009 0.007
21 0.990 0.992 0.010 0.008
22 0.990 0.992 0.010 0.008
23 0.975 0.977 0.025 0.023
24 0.967 0.970 0.033 0.030
25 0.963 0.966 0.037 0.034
26 0.938 0.942 0.062 0.058
27 0.935 0.939 0.065 0.061
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072
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28 0.922 0.926 0.078 0.074
29 0.913 0.916 0.088 0.084
30 0.908 0.912 0.092 0.088
31 0.904 0.908 0.097 0.092
32 0.903 0.907 0.098 0.093
33 0.902 0.907 0.098 0.093
4.4 Percentage voltage performance (PVP)
The voltage performance improvement for the 33-bus
distribution system can be obtained using voltagedeviation.
The use of PSO has yield a significant voltage performance
where it records maximumperformanceof20.19%atbus22
whereas bus 19 record minimum performance with 0% as
expected since bus 19 has minimum voltage deviation. The
percentage voltage performance of the 33-bus distribution
system is shown in Figure 3.
Fig - 3: Percentage voltage performance of 33-bus
distribution system
4.5 Optimal locations and DG sizes
Figure 4 shows the optimal locations and sizes of the DGs.
DG units of 1.7154MW, 0.1908MW and 1.6159MW are to be
installed at bus locations 18, 14 and 17 respectively with
total DG capacity of 3.5221MW. The simulation indicated
significant reduction of total power loss as a result of
allocating of DG from 0.2233MW to 0.0227MW, which is
corresponding to 89.83% reduction.
Fig - 4: Extract from MATLAB software environment
indicating the DG location, Size and total power loss from
the simulation
5. CONCLUSION
This paper presents the allocationand sizingofDGusingPSO
technique to minimizevoltagedeviationandtotal powerloss
in a radial distributed system. The performance of the
algorithm in the application of DG planning is implemented
on 33-bus radial distribution network. The results obtained
from running of the algorithm shows that the objectives of
this investigation have been achieved. Thus, the result
demonstrates that PSO is an effective method for solving
problems concerning an optimal sizingandlocatingofDGfor
minimizing voltage deviation and total power loss in a
distribution network.
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© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 847
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distributed generator for power loss minimization
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[51] S. P. Ghanegaonkar and V. N. Pande, "Coordinated
optimal placement of distributed generation and
voltage regulator by multi-objective efficient PSO
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 849
algorithm," in 2015 IEEE Workshop on
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[52] Q. Bai, "Analysis of Particle Swarm Optimization
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[54] S. Tamandani, M. Hosseina, M. Rostami, and A.
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BIOGRAPHY
Engr. Dr. ABDULHAMID MUSA [ JP,
FNSE, FNIEEE,FSM,IAENG,CHNR].
A training officer of Electrical
and Electronic Engineering
Department, Petroleum Training
Institute, Nigeria.

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IRJET- Comprehensive Analysis on Optimal Allocation and Sizing of Distributed Generation Units using Particle Swarm Optimization Technique

  • 1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 843 Comprehensive Analysis on Optimal Allocation and Sizing of Distributed Generation Units using Particle Swarm Optimization Technique Abdulhamid Musa Electrical and Electronic Engineering Department, Petroleum Training Institute, Effurun, Nigeria. ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - This paper investigated an optimal allocation and sizing of distributed generation (DG) comprehensively using Particle Swarm Optimization (PSO) algorithm. The objective function of thisstudyistominimizevoltagedeviation (VD) and total power loss in a radial distributionsystem. A33- bus radial network is used to demonstrate the effectiveness of the proposed algorithm. The result shows the weakest voltage level occurs at bus 18 with 0.8981pu. However, with the allocation of 3 DGs, the percentagevoltageperformanceyields a maximum of 20.19% at bus 22, followed by 19.44% and 17.71% at bus 2 and bus 21 respectively. Thus, bus 19 has 0% voltage performance as expected where it has minimum voltage deviation. The PSO results also indicate the optimal allocation of DG units at bus 18, 14 and 17 with corresponding DG sizes of 1.7154MW, 0.1908MW and 1.6159MW. The analysis shows 89.83% reduction of total power loss in the distribution system. Finally, the algorithm has achieved its objectives by using Type I DG and demonstrates that PSO is an effective method for solving problems concerning an optimal sizing and locating of DG for minimizingvoltage deviation and total power loss in the distribution system. Key Words: Distributed Generation, Particle Swarm Optimization algorithm, Total Power Loss, Voltage Deviation, Voltage Profile. 1. INTRODUCTION The complexity of power system makes its operation very complicated on considering a high demand for electricity supply and load density. The primary cause ofuncertainty in power system planning is the load demand which is originated due to the variety of electricity supply need from a different class of customers [1]. In such circumstances, there is usually voltage profile degradation, and the voltage profile of a distribution system get reduced as it gets away from the sub-station [2]. Thus, this necessitated delivering electrical power over long transmissionanddistributionline to meet the ever increase of energy demand [3, 4]. Many conventional ways of electricity generation use primary sources of energy that are non-renewable and as such their exhaustiveness in nature. This calls for theuseof distributed generation (DG) and the use ofDGtechnology.DGsystem isa part of smart grid concept which is currently forming the backbone of a modern distribution system. The DG can, however, be renewable energy source (RES) like photovoltaic, wind turbines, small hydro, biomass etc. or fossil fuel based sourcessuchasinternal combustion engines (IC), combustion turbines and fuel cells [5]. Several studies provide benefits of DG in terms of their integrating and modular nature in a competitive electricity market environment. These benefits include power loss reduction [1, 6-11], voltage profile improvement [1, 4, 6, 8, 9], reliability [1, 6-8, 11-13], short lead time and low investment risk [14], relieved transmission and distribution congestion [7], peak demand loss reduction [4], energy loss reduction [4], frequency improvement [7], power factorand stability improvement [4], increase the distributioncapacity [8], reduced emissions of pollutants [7, 13] in a distribution system. The contributions to achieving solutions for optimization problems of optimal allocation of DG are reviewed in the following item. 1.1 Literature Review There are several methods proposed in solving an optimization problem in terms of optimal locationandsizing of DG, which can either be conventional or stochastic search algorithms. Example of the traditional technique includes analytical way by exact loss formula [15], a study devoid of bus impedance matrix [16], analysis based on load concentration factor [17], Power Voltage Sensitivity Constant method [18], etc. It is evident from the literature [19] that the conventional orclassical methodofanalysishas the disadvantage of finding the optimal solution for the nonlinear optimization problems. DG allocation is a nonlinear optimization problem where traditional optimization techniques are not appropriate for solving. Additional issue is the consideration of a criterion to decide whether a local solution is also a global solution. The advent of stochastic search algorithms has provided alternative approaches for solving optimal DG allocation problems. These population-based techniques exterminatemostofthe difficulties of classical methods. Many of these stochastic search algorithms have already been developed and successfully implemented to solve optimal DG placement problems [20]. Appropriate sizing and allocating of DG will reducetotal loss and increase the overall performance of the distribution system. However, improper DG placement and sizing may affect the DG’s benefits negatively such as an increase in system power losses and costs [1, 3, 21-23],whichcaneither be in a steady state or dynamic form [24]. Thus, the allocation of DG unit in a best place and preferable size in distribution systems are categorized as a complex combinatorial optimization problem [25]. Previous studies have reported different optimization techniques to solve optimal allocation and sizing of DG units for different DGs’
  • 2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 844 issues. For instance, an Adaptive Quantum-inspired Evolutionary Algorithm (AQiEA) [21],Feasibility-Preserving Evolutionary Optimization [6], Genetic Algorithm (GA) [4, 26], Dragonfly algorithm [7], Firefly algorithm [27], Chaotic stochastic fractal search algorithm [28], Crow Search Algorithm [29], Nature Inspired Algorithms [30], Particle Swarm Optimization (PSO) Algorithm [31, 32], artificial immune system (AIS) [33], Multi-objective Evolutionary Algorithm with Tables (MEAT) [34], Ant Lion Optimization algorithm (ALOA) [35], Modified Shuffled Frog Leaping optimization Algorithm (MSFLA) [36], bacterial foraging optimization [37], Bat-inspired algorithm [38], Social Learning Particle Swarm Optimization (SLPSO) algorithm [39], Bat-inspired algorithm [40], Chaotic Artificial Bee Colony (CABC) algorithm [41], Cuckoo Search Algorithm (CSA) [42], Differential Evolution (DE) [43], Evolutionary Programming (EP) [44], and Gravitational SearchAlgorithm (GSA) [23]. However, the algorithms mentioned above have examined different test cases with different types of DG units for the objective function. Type I to type IV DGs are identified by researchers in [3, 8, 11, 14, 45-47] where in type I - the DG inject active power and operates at unity power factor; type II – the DG injects reactive power; type III – the DG injects both kW and kVAr such as synchronous machines, and type IV – the DG consume reactive power but injecting active power like in induction generators, respectively. This paper utilizes the PSO technique to obtain the optimal size and location of three DGs in a distribution network with objective function of improving voltage profile, minimizing voltage deviation and reducing total power loss of a distribution system. 2. PROBLEM FORMULATION One of the primary emphasisconcerning a DGplacementand sizing is to minimize voltage deviation and also reduce the active power loss.However, optimal solutionsmayfacesome technical and geographical issues. An alternative solution is to find the optimal DG location and the corresponding minimum size required to achieve a certain planned power loss [48]. The distribution system Power losses have always been an essential issue due to the energy efficiency and the costs for electricity supplies [40]. 2.1 Objective function The objective of the optimal size and location of DG problem using PSO is to increase voltage profile and minimize the total active power loss of the distribution system subject to constraints. 2.1.1 Power loss minimization (1) Where i is the branch number, n total number of branches and Ii is the ith active current. 2.1.2 Voltage Deviation (VD) The objective function to improve voltage profile involves computation of voltage deviations as in Equation 1. (2) 2.1.3 Percentage voltage performance (PVP) This is the ratio of the difference between VD at base and VD at DG to VD at base and is given by equation 2. (3) 2.1.4 Constraints Bus Voltage Limits: System’s voltage limitsareconsidered to be +5% of the nominal voltage value, (Vi). 0.95  Vi  1.05 (4) DG constraints: This is a DG size (PDG) limit between the maximum and minimum capacity. Since type I DG is considered for this study, only active power limit is provided. Thus, 1kW  PDG  2MW (5) 3.PARTICLE SWARM OPTIMIZATION (PSO) ALGORITHMS Particle swarm optimization (PSO) algorithms are nature- inspired population-basedmetaheuristicalgorithms [40,49- 52]. These algorithms mimic the social behavior of birds flocking and fishes schooling. The benefits ofParticleSwarm Optimization over other conventional techniques include: i. PSO is based on the intelligence [46, 52]. ii. PSO requires few particles to beregulated.Thesearch can be carried out by the speed of the particle [46, 50, 52]. iii. PSO gives faster convergence to a solutionclosetothe optimal [46, 49, 50]. The main steps in PSO algorithm implementation [53] is given as Initialize Population repeat Calculate fitness values of particles Modify the best particles in the swarm Choose the best particle Calculate the velocities of particles Update the particle positions
  • 3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 845 until requirements are met. 4. Simulation Results and discussion To appraise the performance of PSO algorithm in the application of DG planning problem, the 33-bus radial distribution system is simulated using MATLAB 2016a software. The PSO is used to find the optimal location and sizing of DG for the minimization of voltage deviation and total loss of the network. 4.1 The 33-bus distribution system The single line diagram of 33-bus system [54] is shown in Figure 1. The system voltage is 12.66 kV and total system active loads are 3715 kW. This test system consists of 33 buses and 32 branches. Fig – 1: Single line diagram of 33-bus distribution system 4.2 Established objective function Like any other metaheuristic algorithm, PSO’ s performance is dependent on the values of its parameters. Therefore, the PSO parameters used for this study are used as follows: number of populations is set to 50 and maximum number of iterations is set to 100. The acceleration constant = 0.1, the Initial inertia weight = 0.9 and final inertia weight = 0.4. The minimum global error gradient = 1e-10. The convergence characteristics forthesimulationisplotted on Figure 2. the figure shows the effectiveness of the choice of the proposed PSO technique in avoidance of premature convergence. 0 10 20 30 40 50 60 70 80 90 100 Iteration 0 10 20 30 40 50 60 ObjectiveValue PSO Algorithm Fig – 2: The PSO convergence characteristics 4.3 Voltage deviation without and without DG allocation. The values of base voltage and the voltage with the allocation of three DG units using PSO technique are arranged in table 1. The bus 1 has maximum potential of 1pu and seconded with bus 22 that has 0.99pu. The base voltage recorded its weakest voltage level at bus 18 with 0.8981pu. However, with the allocation of 3 DGs at bus locations 18,14 and 17, the voltage deviation of each bus has changed with an exception of bus 1 and bus 22. Table -1: Voltage deviation without and with DG of 33-bus system Bus number Base voltage (pu) Volt with DG (pu) Base voltage deviation Volt with DG deviation 1 1.000 1.000 0.000 0.000 2 0.996 0.997 0.004 0.003 3 0.980 0.981 0.020 0.019 4 0.971 0.972 0.029 0.028 5 0.962 0.964 0.038 0.036 6 0.941 0.942 0.059 0.058 7 0.937 0.938 0.064 0.062 8 0.931 0.933 0.069 0.067 9 0.924 0.926 0.077 0.075 10 0.917 0.919 0.083 0.081 11 0.916 0.919 0.084 0.082 12 0.914 0.917 0.086 0.083 13 0.907 0.910 0.093 0.090 14 0.904 0.908 0.096 0.092 15 0.903 0.906 0.097 0.094 16 0.901 0.905 0.099 0.095 17 0.899 0.903 0.101 0.097 18 0.898 0.903 0.102 0.097 19 0.996 0.996 0.004 0.004 20 0.991 0.993 0.009 0.007 21 0.990 0.992 0.010 0.008 22 0.990 0.992 0.010 0.008 23 0.975 0.977 0.025 0.023 24 0.967 0.970 0.033 0.030 25 0.963 0.966 0.037 0.034 26 0.938 0.942 0.062 0.058 27 0.935 0.939 0.065 0.061
  • 4. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 846 28 0.922 0.926 0.078 0.074 29 0.913 0.916 0.088 0.084 30 0.908 0.912 0.092 0.088 31 0.904 0.908 0.097 0.092 32 0.903 0.907 0.098 0.093 33 0.902 0.907 0.098 0.093 4.4 Percentage voltage performance (PVP) The voltage performance improvement for the 33-bus distribution system can be obtained using voltagedeviation. The use of PSO has yield a significant voltage performance where it records maximumperformanceof20.19%atbus22 whereas bus 19 record minimum performance with 0% as expected since bus 19 has minimum voltage deviation. The percentage voltage performance of the 33-bus distribution system is shown in Figure 3. Fig - 3: Percentage voltage performance of 33-bus distribution system 4.5 Optimal locations and DG sizes Figure 4 shows the optimal locations and sizes of the DGs. DG units of 1.7154MW, 0.1908MW and 1.6159MW are to be installed at bus locations 18, 14 and 17 respectively with total DG capacity of 3.5221MW. The simulation indicated significant reduction of total power loss as a result of allocating of DG from 0.2233MW to 0.0227MW, which is corresponding to 89.83% reduction. Fig - 4: Extract from MATLAB software environment indicating the DG location, Size and total power loss from the simulation 5. CONCLUSION This paper presents the allocationand sizingofDGusingPSO technique to minimizevoltagedeviationandtotal powerloss in a radial distributed system. The performance of the algorithm in the application of DG planning is implemented on 33-bus radial distribution network. The results obtained from running of the algorithm shows that the objectives of this investigation have been achieved. Thus, the result demonstrates that PSO is an effective method for solving problems concerning an optimal sizingandlocatingofDGfor minimizing voltage deviation and total power loss in a distribution network. REFERENCES [1] N. Kanwar, N. Gupta, K. R. Niazi, and A. Swarnkar, "Optimal distributed generation allocation in radial distribution systems considering customer-wise dedicated feeders and load patterns," J. Mod. Power Syst. Clean Energy, vol. 3, no. 4, pp. 475–484, 2015. [2] M. Kashyap, S. Kansal, and B. P. Singh, "Optimal installation of multiple type DGs considering constant, ZIP load and load growth," International Journal of Ambient Energy, 2018. [3] M. S. Sujatha, V. Roja, and T. N. Prasad, "Multiple DG Placement and Sizing in Radial Distribution System Using Genetic Algorithm and Particle Swarm Optimization," Ch. Satyanarayana et al., Computational Intelligence and Big Data Analytics, Springer Briefs in Forensic and Medical Bioinformatics, https://doi.org/10.1007/978-981- 13-0544-3_3, 2019. [4] M. Kashyap, A. Mittal, and S. Kansal, "Optimal Placement of Distributed Generation Using Genetic Algorithm Approach," In V. Nath and J. K. Mandal (eds.), Proceeding of the Second International Conference on Microelectronics, Computing & Communication Systems (MCCS 2017), Lecture Notes in Electrical Engineering 476, https://doi.org/10.1007/978-981-10-8234-4_47, 2019. [5] A. Uniyala and A. Kumar, "Optimal Distributed Generation Placement with Multiple Objectives Considering ProbabilisticLoad" Procedia Computer Science vol. 125, pp. 382–388, 2018. [6] S. Koziel, A. L. Rojas, M. F. Abdel-Fattah, and S. Moskwa, "Power Loss Reduction Through Network Reconfiguration and Distributed Generation by Means of Feasibility-Preserving Evolutionary Optimization," presented at the EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization, 2019. [7] M. C. V. Suresh and E. J. Belwin, "Optimal DG placement for benefit maximization in distribution networks by using Dragonfly algorithm," Renewables vol. 5, no. 4, 2018. [8] D. P. R. P, V. R. V.C, and G. M. T, "Optimal renewable resources placement in distribution networks by combined power loss index and whale optimization
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  • 7. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 849 algorithm," in 2015 IEEE Workshop on Computational Intelligence: Theories, Applications and Future Directions (WCI), 2015, pp. 1-6. [52] Q. Bai, "Analysis of Particle Swarm Optimization Algorithm," Computer and InformationScience, vol. 3, no. 1, 2010. [53] D. Karaboga and B. Akay, "A comparative study of Artificial Bee Colony algorithm," Applied Mathematics and Computation, vol. 214, pp. 108– 132, 2009. [54] S. Tamandani, M. Hosseina, M. Rostami, and A. Khanjanzadeh, "Using Clonal SelectionAlgorithmto Optimal Placement with Varying Number of Distributed Generation Units and Multi Objective Function," World Journal Control Science and Engineering, vol. 2, no. 1, 2014. BIOGRAPHY Engr. Dr. ABDULHAMID MUSA [ JP, FNSE, FNIEEE,FSM,IAENG,CHNR]. A training officer of Electrical and Electronic Engineering Department, Petroleum Training Institute, Nigeria.