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Model Order Reduction of an ISLANDED MICROGRID using Single Perturbation, Direct Truncation and Particle Swarm Optimization
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 07 | July -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1446 Model Order Reduction of an ISLANDED MICROGRID Using Single Perturbation, Direct Truncation and Particle Swarm Optimization Manali Patel 1, Dr. Manish Kumar Srivastava2 Research Scholar ,Dept. Of Electrical Engineering,S.I.E.T.,SHAUTS,U.P,INDIA Head of the Department ,Dept. Of Electrical Engineering, S.I.E.T.,SHAUTS,U.P,INDIA ---------------------------------------------------------------------------***----------------------------------------------------------------------------- ABSTRACT: In this paper we are simplify the model of an islanded micro-grid systems using Single Perturbation method (SP) and Particle Swarm Optimization. The used model is of an 6th Order islanded micro-grid model. As we know it is not possible to approximate the dynamics of any system using slow subsystem, so we also obtain the result of slow subsystem in this paper. In this work, we presented two Model order reduction methods viz. Direct Truncation (DT) and Particle swarm optimization. Thus, sixth order has been reduced to the fourth order approximation. We have also presented the Particle Swarm Optimization (PSO) to reduce the model order to 2. Thus various responses have been compared. In the results, it has been shown that even with using 2nd order reduction using PSO, it shows the improved response than other methods. Keywords: singular perturbation method, Direct Truncation, micro-grid, model order reduction. 1 INTRODUCTION Smart grid are increasing in these days frequently, many research have been done on many areas like , control of grid system, safety regards of micro grids, smart operation of grids. As we know the interconnections of machine make the system is of higher order which create the large computational work and due to uncountable feedback loops , the system design become difficult. Hence order reduction technique become very useful to simplify the higher order system to low order system. It has also an advantage that it has not any significant effects on the properties of the system. Within a microgrid numerals order reduction have been employed and also for specific systems within it like , generators , renewable energy sources , controller design purpose . In this paper we used a six order model of a Islanded micro grid system[7]. Two techniques have been discussed to simplify the dynamics , first is the singular perturbation method and second is Direct Truncation method. Direct truncation gives a good model match at high frequency , while singular perturbation methods have superior low frequency properties .Two different perturbation parameters have been used (Є=0)(Є≠0). In this work, we have presented the Particle Swarm Optimization (PSO) method for model order reduction of 6th order to 2nd Order respectively. Thus, the various responses have been observed. It was found that it outperforms all the methods in terms of the output responses. 1.1 ISLANDED GRID SYSTEMS Fig.1. Model of an Islanded Grid systems The system of Fig. 1 is required to operate in both the grid- connected and the islanded modes. In the grid-connected mode, the interface converter operates as a current- controlled VSC. Voltage magnitude and frequency of the local load (PCC) are dictated by the grid. A -frame current- control scheme is designed to control the power-exchange between the DG unit and the grid of Fig. 1. The grid can exchange real and reactive power with the potential island. When both real and reactive power exchange between the potential island and the grid are zero, the system operates in a matched power state. Otherwise, the system is in a mismatched-power condition. When the DG unit and the local load are islanded by opening switch S, due to power mismatch between the load and the DG unit and in the absence of voltage and frequency controls, the PCC voltage and frequency deviate from their rated values. Thus, voltage and frequency of the load can vary significantly if the DG unit does not provide voltage and frequency control. Therefore, to achieve uninterruptible autonomous operation of the island, the islanding event must be detected and subsequently voltage and frequency must be controlled. In this case, the new controller to be developed should regulate voltage magnitude and frequency of the load.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 07 | July -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1447 The design of this new controller is based on a dynamic model of the islanded system as discussed in the next section. The frequency of the islanded system is controlled using an internal oscillator in an open-loop manner. Frequency of the internal oscillator is set at the system nominal frequency. 1.2 Direct Truncation Model On the other hand, the response of the fast subsystem obtained via exact decoupling is almost identical to the response of the original system. The exact slow-fast decomposition is achieved by utilizing the Chang transformation as above. 1.3 Particle Swarm Optimization (PSO) Particle Swarm Optimization simulates the behavior of a swarm i.e. a group of birds. It is a computational method that optimizes a problem by running several iterations until the optimal solution is obtained. This stochastic optimization technique based on population was developed by Dr.Eberhart and Dr. Kennedy in 1995. It is a technique implemented in various applications in order to determine an optimum solution. It simulates the intelligent behavior of a group of birds moving from a place to their target. The birds adjust their velocity and speed to reach the target in accordance to their own position as well as neighbor’s position closest to the optimum solution. Similarly, initial solutions assumed are moved around in a search space logically following the PSO algorithm in accordance with the particular application and varying various parameters to reach the optimum solution. PSO learned from the scenario and used it to solve the optimization problems [2]. In PSO, each single solution is a bird in the search space termed as particles. Initially, depending on the application a search space is decided consisting of a number of solutions. Each particle’s initial position and velocity is assumed. Pseudo-code: Equation (a) v[ ] = c0 *v[ ]+ c1 * rand() * (pbest[ ] - present[ ]) + c2 * rand() * (gbest[ ] - present[ ]) Equation (b) present[ ] = present[ ] + v[ ] For each particle Initialize particle END Do For each particle Calculate fitness value If the fitness value is better than its peronal best set current value as the new pBest End Choose the particle with the best fitness value of all asgBest For each particle Calculate particle velocity according equation (a) Update particle position according equation (b) End Parameters Values No of Swarm 40 Bird Step 40 Dimension 3 PSO Parameter C1 1 PSO Parameter C2 1 PSO Parameter C3 0.8 1.4 SIMUALTION PARAMETERS Parameters Symbols Values Resistance of VSC Filter Rt 1.5 mΩ Inductance of VSC Filter Lt 300uH VSC Rated Power 200 MVA VSC Terminal Voltage 600V Switching Frequency fsw 1980 Hz DC Bus Voltage vdc 1500 V Load Nominal resistance R 56 Ω Load Nominal Inductance L 111.9 mH Load Nominal Capacitance C 120uF Load Quality Factor Q 1.83 Load Resonant Frequency fres 273 Hz Inductor Quality Factor ql 753.36 System Nominal Frequency f0 60 Hz Transformer Voltage ratio 0.6/13.8 kV Transformer rating 200 MVA
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 07 | July -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1448 Here, all the parameters has been listed of the Islanded systems. The VSC parameters has been listed as Rt and Vt. The system has been designed for the 200MVA systems. The switching frequency has been used as 1980 Hz. Also, the Load has been presented as R = 56 Ohm, L = 111.9 mH, C = 120uF. 2 RESULTS & DISCUSSIONS Fig.2 frequency Response of the original 6th Order system Fig.2 Shows the frequency response of the original system. It follows the low pass system. It shows the higher order and lower order oscillatory behaviour. Our motive is to follow the same response through direct truncation method. Fig.3 frequency Response of the reduced system transfer function of original 6th Order system Fig.3 Shows the frequency response of the reduced order system. It has been shown that as per fig.3. the obtained reduced order system follows the similar response to that of the original system. Now, since the original system resembles the MIMO system. Thus, reordering the same, we get two transfer functions H1 and H2. Thus here, both transfer function has been presented and their step response curve has been shown.
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 07 | July -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1449 The transfer functions of the H1: The transfer function of the H2: Response of H1 and H2: Fig.4 Step response of Original H2 Fig.5 Step response of Original H1 Step response of H 1 and H 2
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 07 | July -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1450 the time domain response of the both systems. Thus, both the curves has been presented here. 4 CONCLUSION In our proposed work, we have reduced the order of the original system by using two different methodology viz. Direct truncation, and Particle Swarm Optimization. The PSO represents the reduction into 2nd order and DT- method into the 4th order model. Thus, the results, has shown that model order reduction by the Direct Truncation resembles the response to the original one. Thus, it’s shown that direct truncation has been one of the finest reduction techniques. Also, we have used PSO for the model order reduction. It has been shown that the model obtained by PSO is very similar to the original model. And thus, we have also got improved results in the form of the step plots. REFERENCES [1] D.E. Olivares, A. Mehrizi-Sani, A.H. Etemadi, C.A. Canizares, R. Iravani, M. Kazerani, A.H. Hajimiragha, O. Gomis-Bellmunt, M. Saeedifard, R. Palma-Behnke, G.A. Jimenez-Estevez, N.D. Hatziargyriou, “Trends in Microgrid Control,” IEEE Trans. on Smart Grid, vol. 5, no. 4, pp.1905- 1919, Jul. 2014. [2] M. S. Mahmoud, S. A. Hussain, and M. A. Abido “Modeling and control of microgrid: An overview,” Journal of the Franklin Institute, vol. 351, pp.2822-2859, Jan. 2014. [3] A. S. Dobakhshari, S. Azizi, and A. M. Ranjbar, “Control of microgrids: Aspects and prospects,” Proc. of International Conference on Networking, Sensing and Control, April 2011. [4] D. Chaniotis and M. A. Pai “Model reduction in power systems using Krylov subspace methods,” IEEE Trans. on Power Sys., vol. 20, no. 2, pp. 888-894, May 2005. [5] F. D. Freitas, J. Rommes, and N. Martins “Gramian- based reduction method applied to large sparse power system descriptor models,” IEEE Trans. on Power Sys., vol. 23, no. 3, pp.1258-1270, Aug. 2008. [6] L. Luo and S. V. Dhople “Spatiotemporal model reduction of inverterbasedislanded microgrids,” IEEE Trans. on Energy Convers., vol. 29, no. 4, pp. 823-832, Dec. 2014. [7] X. Xu, R. M. Mathur, J. Jiang, G. J. Rogers, P. Kundur, “Modelingof generators and their controls in power system simulations using singular perturbations,” IEEE Trans. on Power Syst., vol. 13, no. 1, pp. 109-114, Feb. 1998. [8] P. W. Sauer, D. F. LaGesse, S. Ahmed-Zaid, M. A. Pai, “Reduced order modeling of interconnected multimachine power systems using time-scale decomposition,” IEEE Trans. on Power Syst., vol. PWRS-2, no. 2, pp. 310-320, May 1987. [9] P. Li, B. H. Zhang, J. Shu, Z. Q. Bo, A. Klimek, “Research on order reduction of power system modeling for dynamic Fig.6 Step response of reduced order H1
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 07 | July -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1451 voltage stability analysis,” Transmission and Distribution Conference and Exposition, New Orleans, USA, 2010. [10] H. Karimi, E. J. Davidson, and R. Iravani, “Multivariable servomechanism controller for autonomous operation of a distributed generation unit: design and performance evaluation,” IEEE Trans. on Power Sys., vol. 25, pp. 853 865, 2010. [11] M.G. Safonov and R.Y. Chiang, A Schur Method for Balanced- Truncation Model Reduction, IEEE Trans on Automatic Control 34 (1989), pp. 729 –733. [12] E. Fridman, Robust Sampled-Data ∞ H Control of Linear Singularly Perturbed Systems, IEEE Transactions on Automatic Control 51 (2006), pp. 470-475. [13] P. Heydari and M. Pedram, Model-Order Reduction Using VariationalBalanced Truncation with Spectral Shaping, IEEE Transactions on Circuits and Systems I 53 (2006), pp. 879-891. [14] G. Parmar, S. Mukherjee, and R. Prasad, System reduction using factor division algorithm and eigen spectrum analysis, Applied Mathematical Modeling 31 (2007), pp. 2542–2552. [15] T. Reis and T. Stykel, Balanced truncation model reduction of second order systems, Mathematical and Computer Modeling of Dynamical Systems 14 (2008,), pp. 391-406. [16] K. Willcox and J. Perarie, Balanced Model Reduction via the proper orthogonal decomposition, AIAA.J. ,40 , 2002, pp. 2323-2330. [17] K. Fujimoto and J.M.A. Scharpen, Balancing and Model Reduction for Discrete-Time Nonlinear System based on Hankel Singular Value Analysis, Proceedings of the MTNS 2004, Leuven, Belgium, July 2004, pp. 343-347. [18] P. Rabiei and M. Pedram, Model-Order Reduction of Large Circuitsusing Balanced Truncation, Proceedings of the IEEE ASP-DAC, Wanchai, Hong Kong, Jan. 1999, pp. 237-240. [19] S. Gugercin, C. Athanasios, A.C. Antoulas, and C. Beattie, A Rational Krylov Iteration for Optimal H2 Model Reduction, Proceedings of the 17th Int. Symposium on Mathematical Theory on Networks and Systems, Kyoto, Japan, 2006, pp. 1665-1667. [20] G. Obinata and B.D.O. Anderson, Model Reduction for Control System Design, Springer-Verlag, London, 2001. [21] S. Panda, J.S. Yadav, N.P. Padidar, and C. Ardil, Evolutionary Techniques for Model Order Reduction of Large Scale Linear Systems, Int. J. Applied Sci. Eng. Technol.5 (2009) ,pp.22-28. [22] G. Parmar M.K. Pandey, and V. Kumar, System Order Reduction Using GA for Unit Impulse Input and a Comparative Study Using ISE and IRE, International Conf. on Advances in Computing, Communications and Control, Mumbai, India , Jan. 2009, pp.23-24. [23] C.B. Vishwakarma and R. Prasad, MIMO System Reduction Using Modified Pole Clustering and Genetic Algorithm, Modeling and Simulation in Engineering 2009(ID 540895) 2009, pp. 1-5. [24] J. Kennedy and R.C. Eberhart, “ Particle Swarm Optimization”, in Proc. IEEE Conf. Neural Networks IV, Piscataway, NJ , 1995. [25] G. Parmar, S. Mukherjee, and R. Prasad, Reduced order Modeling of linear MIMO Systems Using Genetic Algorithm, Int. J. simul. Model 6 (2007) 3, pp. 173-184. [26] S. Mukherjee, M. Satakshi, and R.C. Mittal, Model order reduction using response matching technique, J. Franklin Inst. 342 (2005), pp. 503–519.
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