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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1814 Optimal Placement and Size of DG and DER for Minimizing Power Loss and AEL in 33-Bus Distribution System by various Optimization Techniques Priya Kashyap1 and Pushpendra Singh2 1M.Tech student, EE Dept., Govt. Women Engineering College, Ajmer, India 2Assistant Professor, EE Dept., Govt. Women Engineering College, Ajmer, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - In the electrical power distribution system the network feeds inductive loads for low voltage level, which lead to higher currents and power losses. Therefore, it is mandatory to improve the power system stability and reliability, power factor and voltage profile, which is done by placing active and reactive resources i.e., DG and Capacitor bank in the system. This paper presents the new optimization techniques for finding the optimal location and size of DG and capacitor bank in the electrical network .The proposed MFO optimization technique is first validated for power loss minimization, performed in the MATLAB R2015a software. Further, results are obtained for DG and DER placement in 33 bus system for different load levels-peak, normal and light load level. The study states that the best location and size of DG and DER is obtained by using MFO techniques for minimizing Power Loss and further minimizing AEL in the distribution system. Key Words: DG(Distributed generation), DER(Distributed Energy Resources),Optimization technique, MFO(Moth Flame Optimization), GOA(Grasshopper Optimization Algorithm), AEL(Annual Energy Loss). 1. INTRODUCTION The power system contains three major blocks i.e. power generation, power transmission, and power distribution. Power is generated at power generation stations and travels towards consumer area via transmission and distribution system. The type of distribution system used is of Radial Type because of its simplicity. In a radial distribution system, there are main feeders and lateral distributors. The main feeder originates from the substation and passes through different consumer loads. Laterals are connected to individual loads.[1] The two major challenges that the modern power systems are facing are voltage and angle stabilities, expansion in electrical power network and increase in load demand which leads to the stability issues, voltage level and power losses issues. To obtain best from the existing network. i.e., to enhance voltage, minimize the losses compensation is done by placing the capacitor bank at a particular node in the system [2][3]. Nowadays Distributed generation is used, which are small sized power generating units near to the load center [4][5]. Which further increase its overall efficiency in the distribution system at optimal locations. DG is acronyms of Distributed generation and it is also called as a decentralized generation, embedded generation or dispersed generation.[6]The literal meaning of Optimization is the act of making the best or most effective use of a situation or resource. For starting any prototype in engineering design, both analysis and optimization are employed. An optimum solution for a problem is determined by the use of optimization methods.It is beneficial in reducing the losses effectively compared to other methods of loss reduction.[7] In this paper, optimal DG unit size and its placement using GOA and MFO algorithm are discuss. 2. Problem Formulation The study is done for the active power loss minimization of the test power system. Consider the objective function for active power minimization as: Nb-1 Fploss= ∑ ki ri i=1 (1) ri resistance of line i Vi voltage magnitude of bus i Pi , Qi real and reactive power injected to bus i The power flow equations are given by: Nb-1 Pi+PDGi-PLi-Vi ∑Vj[Gij cos(𝞗ij) + Bij sin(𝞗ij)] = 0 i=1 (2) Nb-1 Qi+QDGi-QLi-Vi ∑Vj[Gij sin(𝞗ij) + Bij cos(𝞗ij)] = 0 i=1 (3) PDGi , QDGi DG power generation at bus i . PLi , QLi Active, Reactive power load at bus i . Gij Conductance of the line (between bus i and bus j) . Bij Susceptance of the line (between bus i and bus j) . 𝞗ij Angle between bus i and bus j . DG Capacity limit PDGi min ≤ PDGi ≤ PDGi max (4) PDGi min Lower limit 𝑃𝑖 2 + 𝑄𝑖𝑖 2 𝑉𝑖 2
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1815 PDGi max Upper limit NL=NB -1 (5) NL Number of lines. [8] 3. GOA (Grasshopper Optimization Algorithm) The flow chart of GOA is show in Figure 1 Initialize swarm Xi (i=1,2,3….n) Initialize cmax,cmin and maximum number if iteration Calculate fitness of seach agent And asign T as best search agent Update c=cmax-l Normalize the distance between grasshopper Update the position of search agent and T Criteria satisfied? Fig -1: Algorithm for GOA.[8][9] Grass hopper Optimization is a Meta heuristic algorithm that works on the swarming behavior of grasshoppers. It is an insect with long hind legs .These insects have special social interaction which equip them with the predatory strategy. The social interaction have the two type of forces attractive forces that exploit local search and reputation force to explore search space.[8]This algorithm is run for 150 iterations for finding the results for different load level . 4. MFO (Moth Flame Optimization) The navigation method of moths is the main inspiration of this optimizer. Moths have a very effective mechanism of flying at night and traveling in a straight line by maintaining a fixed angle with respect to the moon. . [9][10][14]. The below flow chart Figure 2, of MFO will explain the mechanism of this algorithm. Define the algorithm parameters Randomly generate initial moth Calculate fitness function Tag best position by flame Update flame number,r,t and calculate D Update M (i,j)…eq(6) NO Termination Criteria satisfied? YES Report best position among the moth Fig -2: Algorithm for MFO. [9][10][13] Moths are insects that belonged to the family of butterflies. The special navigation method of these insects is developed to fly at night using moon light. The moth flies by maintaining a fixed angle with the moon, this mechanism called transverse orientation for navigation. But, When moths see an artificial light, the light is extremely close compared to moon, so they try to maintain a similar angle with the light to fly in straight line. However, maintaining a similar angle to the light source causes a useless or deadly spiral fly path for moths . Equation 6 is the representation of moth in matrix form M=[ 2 2 ] (6) START START END END
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1816 F=[ 2 ] (7) Flame matrix similar to moth matrix. S( )= . ebt . cos(2πt)+ (8) - distance of the i-th moth for the j-th flame, b- constant for defining the shape of the logarithmic spiral t -random number in [-1,1]. | | (9) n -number of moths d - number of variables (dimension). - i-th moth, - j-th flame, and - distance of the ith moth for the j-th flame. [11][12]. 4.1).Validation of MFO The proposed technique is implemented on benchmark 33-bus test distribution system. This is a 12.66 kV radial distribution system with total real demand of 3.715 MW and reactive demand of 2.3MVAr. . The data is taken from reference number [15]. Initially, the proposed MFO technique is validated for 33 bus system for power loss minimization. Figure 3 shows the Convergence curve, that shows score obtained for 150 iterations. Table-1 shows the worst fitness value is 0.0840 and best fitness value is 0.0715. The mean fitness value is 0.0777.It take approx. 125 seconds by MFO technique to minimize the result from 0.085 to 0.0715. These values shows the power (MW) values analyzed at every iteration by MFO technique. Further , analysis is done for : (i)3 DGs placement in the system and (ii) 3 DGs with 3 shunt capacitors for DER placement in the system which is explained in the CASE STUDY below. Fig -3: MFO best fitness. Table -1: Value of MFO best fitness. Method Worst Fitness Best Fitness Mean Fitness CPU Time(sec) MFO 0.0840 0.0715 0.0777 125 sec Table -2: Different Load Levels with Load duration and Cost.[17][18] LOAD LEVEL mf LOAD DURATION(h) USD/MWh Peak(P) 1.6 1500 120 Normal(N) 1.0 5256 72 Light(L) 0.5 2000 55 5. CASE STUDY: Optimal locations of DG and DER are analyzed using GOA and MFO techniques for different load levels. Parameters for different load levels are taken from Table [17][18]. Both the algorithms are run for 150 iterations. Table no. 3 show the optimal locations and sizes of DGs and DERs, losses in each techniques, minimum voltage value and DG and DER Penetration percentage for both techniques. The generated results are best when MFO is used and hence different graphs are plotted using these results. Figure 4 and Figure 5 shows plot for Voltage (pu) on each bus for DG and DER placement respectively. A comparison of Voltage values at each bus is shown in Figure 6, both for DG and DER placement .And Figure 7 shows bar graph showing the losses for different load conditions. This bar graph shows that the losses are maximum at base case, i.e., when DG/DER(s) are not installed, and the losses in the system are greatly reduces by placing DG/DER .Losses minimization is more when DER is placed in the system. Fig -4: Voltage (pu) at each bus for DG placement in 33 bus system.
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1817 Fig -5: Voltage (pu) at each bus for DER placement in 33 bus system 6. CONCLUSION This paper presents the optimization techniques to get the optimal locations and sizes of DG and DER for benchmark 33 test bus system. The techniques used are GOA and MFO.The MFO Techniques shows the better result for DG and DER placement over GOA.The best location analyzed by MFO for DGs placement is at 13,24,30 bus number that reduces losses from 0.2027MW to 0.0715MW at normal load condition with DG penetration 69.65%-calculated for peak load condition.For DER placement, DGs at bus number 13,25,30 with Shunt Capacitors location at bus number 7,13,30.In this case the losses reduces from 0.2027MW to 0.0144MW at normal load condition with DER penetration 59.68%-calculated for peak load condition. The above graphs and Tables-3 shows that the location analyzed by proposed MFO techniques greatly minimizes the losses, further the annual energy losses (AEL) from 2023.50 MWh, at base case to 696.44MWh for DGs and 2023.50 MWh, at base case to 157.89MWh for DERs placement which further reduces the Cost (USD) as well as boost up the voltage of the 33 bus system, that justifies their placement in the power system . Fig -6: Comparison plot for Voltage (pu) at each bus for DG and DER placement in 33 bus system Fig -7: Bar graph showing the losses for different load conditions in 33 bus system.
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1818 Table -3: Optimal locations and Sizes of DG and DER for IEEE-33 bus system for different Load Levels. Sno. METHOD Used OPTIMAL DG Location At mf OPTIMAL DG SIZE(MW) LOSSES(MW) Vmin DG penetration (%) Total AEL(MWh) COST(USD) 1 Base Case --- P --- 0.5754 0.85 --- 2023.502 185519.544 N 0.2027 0.91 L 0.0471 0.96 2 GOA 12 24 30 P 1.368 1.463 1.409 0.1966 0.94 60.65 709.146 64618.712 N 0.931 1.074 1.016 0.0721 0.97 L 0.451 0.531 0.501 0.0175 0.98 3 MFO 30 24 13 P 1.810 1.779 1.279 0.1905 0.95 69.65 696.440 63271.480 N 1.091 1.094 0.789 0.0715 0.97 L 0.530 0.540 0.390 0.0173 0.98 Sno. METHOD Used OPTIMAL DER Location At mf OPTIMAL DER SIZE(MW) LOSSES(MW) Vmin DER penetration (%) Total AEL(MWh) COST(USD) 1 Base Case --- P --- 0.5754 0.85 --- 2023.502 185519.544N 0.2027 0.91 L 0.0471 0.96 2 GOA 24 12 31 {DG} P {1.596 1.301 0.976} 0.0533 0.97 63.93 166.050 15670.800 [1.540 0.215 0.476] N {1.076 0.930 0.885} 0.0150 0.99 30 4 14 [SC] [1.036 0.215 0.367] L {0.537 0.460 0.441} 0.0036 1.00[0.500 0.215 0.172] 3 MFO 13 30 25 {DG} P {1.175 1.420 1.085} 0.0501 0.97 59.68 157.894 14856.568 [1.225 0.549 0.193] N {0.794 1.058 0.859} 0.0144 0.99 30 13 7 [SC] [1.000 0.352 0.193] L {0.394 0.526 0.429} 0.0035 1.00[0.466 0.152 0.193]
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1819 REFERENCES [1]. PavlosS. Georgilakis, “Optimal Distributed Generation Placement in Power Distribution Networks: Models, Methods, and Future Research” IEEE TRANSACTIONS ON POWER SYSTEMS, December 24, 2012. Paper no. TPWRS-01051-2012. [2]. A. Lakshmi Devi and B. Subramanyam ” OPTIMAL DG UNIT PLACEMENT FOR LOSS REDUCTION IN RADIAL DISTRIBUTION SYSTEM-A CASE STUDY” VOL. 2, NO. 6, DECEMBER 2007. [3]. Pathomthat Chiradeja,” An Approach to Quantify the Technical Benefits of Distributed Generation”, IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 19, NO. 4, DECEMBER 2004. [4]. Amin Khodabakhshian,Mohammad Hadi Andishgar,”Simultaneous placement ans sizing of DGs and Shunt capacitor in distribution system by using IMDE algorithm”,ELSEVIER, Electrical power and Energy System 82(2016)599-607. [5]. P.ChiradejaandR.Ramakumar,“Areviewofdistributedg enerationand storage,” in Proc. 1998 Frontiers of Power Conf., pp. VIII 1–VIII 11. [6]. “Benefits of distributed generation-a simple case study,” in Proc. 1999 Frontiers of Power Conf., pp. X 1–X 9. [7]. Shahrzad Saremi,Seyedali Mirijalili,Andrew Lewis, “Grasshopper Optimization Algorithm:Theory and application”.ELSEVIER ,Advance in Engineering Software 105(2017) 30-47. [8]. Mehran Sanjabi Asasi, Mojtaba Ahanch,”A Grasshopper Optimization Algorithm to solve Optimal Distrbution System Reconfiguration and Distributed Generation Placement Problem”2017S IEEE 4th International Conference on Knowledge- Based Engineering and Innovation (KBEI) Dec. 22, 2017 [9]. Mahdi Bahrami, Omid Bozorg-Haddad, Xuefeng Chu,” Advanced Optimization by Nature-Inspired Algorithms: Moth-Flame Optimization (MFO) Algorithm” pp 131-141. [10]. Seyedali Mirjalili,” Moth-Flame Optimization Algorithm: A Novel Nature-inspired Heuristic Paradigm”( S. Mirjalili, Moth-Flame Optimization Algorithm: A Novel Nature-inspired Heuristic Paradigm, Knowledge-Based Systems (2015), doi: http://dx.doi.org/10.1016/j.knosys.2015.07.006). [11]. K. J. Gaston, J. Bennie, T. W. Davies, and J. Hopkins, "The ecological impacts of nighttime light pollution: a mechanistic appraisal," Biological reviews, vol. 88, pp. 912-927, 2013. [12]. K. D. Frank, C. Rich, and T. Longcore, "Effects of artificial night lighting on moths," Ecological consequences of artificial night lighting, pp. 305-344, 2006. [ [13]. Seyedali Mirjalili,” Moth-Flame Optimization Algorithm: A Novel Nature-inspired Heuristic Paradigm”( S. Mirjalili, Moth-Flame Optimization Algorithm: A Novel Nature-inspired Heuristic Paradigm, Knowledge-Based Systems (2015), doi: http://dx.doi.org/10.1016/j.knosys.2015.07.006) [14]. J. H. Holland, "Genetic algorithms," Scientific American, vol. 267, pp. 66-72, 1992. [15]. Mew E. Baran,Felix f. Wu,” NETWORK RECONFIGURATION IN DISTRIBUTION SYSTEMS FOR LOSS REDUCTION AND LOAD BALANCING”. IEEE Transactions on Power Delivery, Vol. 4, No. 2, April 1989. [16]. N. Kanwar,N.Gupta ,K.Naizi and A. swarnkar,”Simultaneous allocation of distributed resources using improved teacher learning based optimization”.Energy conservation and management,vol.103,pp387-400,2015. [17]. R.S.Rao, K.Ravindra,K.Satish and S.Narasimham,”Power loss minimization in distributed syste using network reconfiguration in the presence of Distributed generation”.IEEE transaction on power system,vol. 28 no.1,pp. 317- 325,2013.
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