American Journal of Electrical and Electronic Engineering
ISSN (Print): 2328-7365 ISSN (Online): 2328-7357 Website: http://www.sciepub.com/journal/ajeee Editor-in-chief: Naima kaabouch
Open Access
Journal Browser
Go
American Journal of Electrical and Electronic Engineering. 2016, 4(1), 9-15
DOI: 10.12691/ajeee-4-1-2
Open AccessArticle

Optimal Control for the Voltage Regulation of a Power Line Including an Interconnection with a Wind Park and FACTS

N. Schinas1, and A. Moullas1

1Department of Electrical Engineering, Technological Educational Institute of Western Greece, Patras, Greece

Pub. Date: February 20, 2016

Cite this paper:
N. Schinas and A. Moullas. Optimal Control for the Voltage Regulation of a Power Line Including an Interconnection with a Wind Park and FACTS. American Journal of Electrical and Electronic Engineering. 2016; 4(1):9-15. doi: 10.12691/ajeee-4-1-2

Abstract

In this paper the voltage regulation of a grid bus is studied. The bus accepts real power from a wind park through a medium voltage cable. The changes of the wind speed result in large alterations in the exchange of real and reactive power between the cable and the grid. As a result, the voltage of the bus is not stable. The installation of a Static Var Compensator(SVC) is a rational choice for the stabilization of the voltage. The SVC needs a controller which according to the difference of the measured voltage from its nominal value, it defines the equivalent susceptance of the SVC. So, the right amount of reactive power between the grid and the SVC is achieved. Two design techniques for the controller are proposed, both based on the theory of optimal control. The full theory of the optimal control used in the design procedure, is given clearly. In the first place, the nonlinear model is linearized in two ways and then the mathematical principles of optimal control are applied. The second input of the linearized model, regarded as disturbance, has been taken into account in the design procedure. The proposed application of the optimal control theory has resulted in controllers that can be regarded approximately as PI controllers andso, their implementation is very easy. The whole nonlinear system has been simulated in SIMULINK so as the response of the proposed system to be judged. The results are satisfactory. Despite the large variations in the exchange of real and reactive power between the wind park and the grid, the variation of the grid voltage is under 1.5%.

Keywords:
optimal control voltage regulation wind turbine FACTS

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

References:

[1]  Vu, H., Pruvot, P., Launay, C., and Harmand, Y. (2002), An improved voltage control on large – scale power system, IEEE Transactions on Power Systems, 11(3), pp. 1295-1303.
 
[2]  Senjyu, T., Miyazato, Y., Yona, A., and Urasaki, N. (2008), Optimal distribution voltage control and coordination with distribution generation, IEEE Transactions on Power Delivery, 23(2), pp:1236-1242.
 
[3]  Novalio, D., Biswarup, D., and Jaydev, S. (2015), Robust voltage regulation in unbalanced radial distribution system under uncertainty of distribution generation and loads, International Journal of electrical Power & Energy Systems, 73, pp:516-527.
 
[4]  Dawood, A. (2016), DSTATCOM modelling for voltage stability with fuzzy logic PI controller, International Journal of electrical Power & Energy Systems, 76, pp: 129-135.
 
[5]  Elmitwally, A., and Eladl, A. (2016), Planning of multi-type FACTS devices in restructured power systems with wind generation, International Journal of electrical Power & Energy Systems, 77, pp:33-42.
 
[6]  Khezri, R., and Bevrani, H. (2015), Voltage performance enhancement of DGIG-based wind farms integrated in large-scale power systems: Coordinated AVR and PSS, International Journal of electrical Power & Energy Systems, 73, pp:400-410.
 
[7]  Wang, X.F., Song, Y., and Irving, M.(2008), Modern Power System Analysis, Springer, New York.
 
[8]  Astrom, K.J., and Wittenmark, B.(2013),Computer Controlled Systems, Dover, New York.
 
[9]  Dorf, R.C., and Bishop, R.H. (2011), Modern Control Systems, Prentice-Hall, London.
 
[10]  Vittal, V., and Ayyanar, R. (2013), Grid Integration and Dynamic Impact of Wind Energy, Springer, New York.
 
[11]  Abad, G., Lopez, J., Rodriguez, M.A., Marroyo, L., and Iwanski, G. (2011), Doubly Fed Induction Machine, IEEE Press, New Jersey.
 
[12]  Gonen, T. (2014), Electrical Power Transmission System Engineering, Analysis and Design, CRC Press, New York.