International Journal of Reconfigurable and Embedded Systems (IJRES) Vol. 1, No. 3, November 2012, pp. 87~94 ISSN: 2089-4864  87 Journal homepage: http://iaesjournal.com/online/index.php/IJRES Digital Control of Static Var Compensator with Field Programmable Gate Array R.S.Dhekekar, N.V.Srikanth Departement of Electrical and Electrronics Engineering, National Institute of Technology, Warangal, India. Article Info ABSTRACT Article history: Received Jun 6, 2012 Revised Oct 5, 2012 Accepted Oct 23, 2012 This paper is about real time simulation and implementation of FPGA Digital Control of Static VAR compensator for 750km lab model of artificial transmission line. In this paper, a new method of controlling SVC using Field Programmable Gate Array (FPGA) is suggested. FPGA controller is used to generate the firing pulses required to for Static Var Compensator. Pulses are synchronized with AC input; the delay of pulses determines the firing angle to driver circuit. The proposed control scheme has been realized using XILINX FPGA SPARTAN 2 XC2S200 and tested actual testing proves that these devices when installed, they keep the bus voltage same as reference voltage (sending-end voltage). The results are prominent and give a way for real-time implementation of the proposed control schemes. These control schemes are simulated for the real-time control along with real-time modeling and simulations.The results are prominent and give a way for real- time implementation. Keyword: FPGA XILINX SVC VAR FACTS Copyright © 2012 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: R.S.Dhekekar, Research Scholar Departement of Electrical and Electronics Engineering, National Institute of Technology, Warangal (506004). India. Email: rsdhekekar@yahoo.co.in 1. INTRODUCTION FACTS devices like SVC can supply or absorb the reactive power in the transmission line, which helps in achieving better economy of power transfer [1]. In deregulated environment reactive power generated by transmission line is one of the important aspects to be considered. Reactive current control through SVC considering load power factor discussed in [2]. SVC control system is implemented in [3]. FACTS devices like SVC can supply or absorb the reactive power in the transmission line, which helps in achieving better economy of power transfer Shunt controllers inject current into the system at the point where they are connected. They can be used as a good way to control the voltage in and around the point of connection by injecting active or reactive current into the system. In this paper artificial transmission line of 750Km (λ/8) is simulated and tested. SVC (TCR+FC) is placed at the receiving end. The receiving end voltage fluctuations were observed for different loads. It was found for light load, receiving end-voltage is greater than sending end-voltage (VR > VS) and for heavy load receiving end-voltage is less than sending endvoltage (VR < VS) [10] [11]. The firing angle for SVC and phase angle for control for various loading conditions to make the receiving end voltage equal to sending end voltage. In this work FPGA base digital firing scheme is implemented to achieve the better control. The advantages of digital controllers are less external passive components, less sensitive to temperature variation, high efficiencyand reconfigurability.The micro-processor based control schemeused in [3] have the advantages of flexibility, higher reliability and lower cost, but the demanding control requirements of modern power conditioning systems will overload most general purpose micro-processors and the computing speed of microprocessor limits the use of microprocessor in complex algorithms. Digital Signal Processors (DSPs) and Microcontrollers are used for digital control applications.