IJLRET International Journal of Latest Research in Engineering and Technology (IJLRET) ISSN: 2454-5031 www.ijlret.com || Volume 03 - Issue 07 || July 2017 || PP. 38-44 www.ijlret.com 38 | Page Power Oscillations Control Using Statics Synchronous Series Compensator with Damping Controller Rajesh Kumar 1 , Dinesh Sharma 2 1 Department Of Basic Engineering/CCS HAU, Hisar (INDIA) 2 Department Of Electrical Engineering /Indian Railway (INDIA) Abstract: The focus of this research work is on SSSC-based power oscillation damping controller, which can damp the power oscillations occurring due to the any change in the transmission line like sudden change in load, sudden change of generator output, occurrence of fault, transmission line switching and short circuit. In this research work, simulation models for single machine and two machine infinite bus systems with active power compensation by SSSC has been developed. These simulation models have been incorporated into MATLAB based Power System Toolbox (PST) for their transient stability analysis. These models were also analyzed for such types of changes with the use of SSSC-based power oscillation damping controller Oscillation damping controller has varied the phase angle & magnitude of the series injected voltage in order to remove the power oscillations of the specified bus which arises due to the changes in transmission line. Keywords: Statics Synchronous Series Compensator, Matlab, Power System Toolbox, Oscillation Damping Controller. I. INTRODUCTION In today’s high complex and interconnected power systems, there is a great need to improve power utilization while still maintaining reliability and security. Reducing the effective reactance of lines by series compensation is a direct approach to increase transmission capability. However, a power transfer capability of long transmission line is limited by stability consideration [13].Oscillation of generator angle or line angle are generally associated with the transmission system disturbances and can occur due to step changes in load, sudden change of generator output, transmission line switching and short circuit [18]. Different modes of rotor oscillation are local mode, intra-area mode and inter-area mode. The frequency of oscillations of rotor swings varies from 0.2 to 4 Hz [2]. The lower end of frequency spectrum corresponds to inter-area modes, in which a large number of generators participated and their damping is difficult. This low frequency is important to damp as quickly as possible because they cause mechanical wear in power plants and cause power quality problem. If the electromechanical oscillations are not properly controlled in the electric power system operation, it may lead to a partial or total system outage [18]. Instability problems in power systems that can lead to partial or full blackout can be broadly classified into three main categories, namely voltage, phase angle and frequency related problems [3]. In early age this signal instability problem was solved by amortisseurs implemented in generator rotors, later with the application of fast excitation system this was solved by development & utilization of Power System Stabilizer (PSS) and however in modern power system due to the connection of power grids in vast area, for inter area oscillation damping due to the ability of controlling line impedance, power flow and bus voltage, Flexible AC transmission Systems (FACTS) devices implementation offers an alternative solution [19]. II. POWER SYSTEM MODEL In order to make a more thorough study for the presence of SSSC & Power Oscillation Damping Controller in a two machine infinite bus system, a study using MATLAB/SIMULINK is done. Such a study will also take into account the transient nature of the system when various changes happened to the two machine infinite bus system. Power System Toolbox (PST) of MATLAB is used for simulation purposes. In the present work active power compensation by injection of different level of voltage (V q ) by SSSC. 1.1 Simulation of Two Machine Infinite Bus System with SSSC 1.1.1 Simulation Model of Two Machine Infinite Bus System with SSSC In this case SSSC is connected between bus 2 and bus 3 of the above two machine infinite bus system so as to connect it in series with line 2. It has a rating of 100MVA and is capable of injecting up to 10% of the nominal system voltage. It has a DC link nominal voltage of 40 kV with an equivalent capacitance of 375 uF.