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Today, Flexible AC Transmission Systems (FACTS) devices provide local reactive power support in load centers and keep bus voltages within safe operating limits. In particular, the single use of parallel FACTS devices may not improve the safe operating conditions of the system depending on the load conditions. Therefore, avoiding parallel FACTS devices' high costs is crucial and determining their optimal places in the system. For this, Static Var Compensator (SVC), one of the parallel FACTS devices, is used. This study investigated the effects of multiple uses of SVC on different load buses on the maximum load parameter of the multi-machine system in a 3-machine 9-bus power system. Moreover, bus-voltage profiles and their changes in active-reactive power are studied in detail. In this study, three analysis methods were used. These are the no SVC, the single use of SVC, and the multiple uses of SVC. The Power Systems Analysis Program (PSAT) was preferred for this simulation study. As a result of the study, using multiple SVCs increases the maximum loading parameter value and improves the bus-voltage profiles and active-reactive power changes compared to others. [ABSTRACT FROM AUTHOR]

Stability analyzes are examined with the help of simulation programs in the continuous, economical and reliable operation of multi-machine power systems. The most common stability analysis in power systems is small signal stability. In this study, small signal stability analysis was investigated with different generator controller models in a 4-machine 2-field test system. Power System Stabilizer (PSS), Automatic Voltage Regulator (AVR) and Turbine Governor (TG) are used as different generator controller models. The simulation study was carried out in the Power Systems Analysis Program (PSAT). Comparisons were made between the situation where there are no controllers in the synchronous generator and the situations with PSS, AVR and TG models. Comparisons are given in figures and tables. In this study, it was observed that the use of PSS, AVR and TG models in a synchronous generator stabilized the system in a short time, the oscillations in the parameters were reduced and the system gave more effective results in terms of small signal stability. [ABSTRACT FROM AUTHOR]

The damping of small frequency oscillations is an important issue in terms of power system stability. These oscillations are damped by the power system stabilizer (PSS). In recent years, power electronics based Flexible AC Transmission System (FACTS) devices have been used efficiently in power system stability studies. In this study, different PSS models, the most advanced model of FACTS devices Unified Power Flow Control (UPFC) and Power Oscillation Damping (POD) were used to provide coordination controller. In addition to PSS models used in synchronous generators, Automatic Voltage Regulator (AVR) and Turbine Governor (TG) models were also used. Small signal stability analysis was carried out in a 2-field, 4-machine system. Power Systems Analysis Program (PSAT) was used for the simulation study. As a result of the study, angular velocity, voltage, active and reactive power comparisons were made in the use of different PSS models with UPFC-POD, and small signal stability analyzes were interpreted. [ABSTRACT FROM AUTHOR]