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The application of technologies for the improvement of voltage stability, particularly during contingencies is a major concern in the field of power networks operation and control. In this paper it is studied the FACTS performance in the dynamic voltage stability of an electric power system. It was considered the influence of two FACTS controllers in parallel or shunt connection, the Static VAR Compensators...
Nowadays, the stability of power systems becomes a crucial research subject and it is very important issue for large scale systems. The transient stability of a long transmission system can be significantly realized by the excitation systems control using generally an automatic voltage regulator (AVR) and a power system stabilizer (PSS). In this paper, the improvement of the power system stability...
Due to the economic and environmental reasons, Saudi Arabia plans to deploy large scale grid-connected distributed generators (DGs) such as photovoltaic (PV) and wind energy systems. Detailed analyses must be carried out to study the impact of such systems on the dynamics and operational characteristics of the existing network. Main focus of this work is to investigate the improvement in voltage stability...
This paper is to present and discuss the new planned 380 kv transmission line performance under steady and transient states. Dynamic modeling and analysis of such inter-tie, which is, proposed to transfer energy from west to south and vice versa will be demonstrated and discussed. The west-central-south Inter-tie links AlAula-Zaba-Tabuk-Tubajal-Jawf-Hail. It is essential to investigate the transient...
Voltage, frequency and power (real and reactive) plays an important role in power system. It should be in a predefined limit and if any one of them violates its limits then the system becomes unstable. Our generation capacity is not increasing as compare to loads increasing due to environmental and economical reason. Power system is operating at critical value. To enhance the maximum power transfer...
The modelling of synchronous generators or synchronous compensators and static var compensators have been studied for voltage stability studies. The best models were established with active voltage control and with loss of control. The voltage stability indexes were evaluated. In all cases, the loss of control proved to have a negative impact on voltage stability conditions.
For complex power transfer interfaces or load areas with multiple in-feeds, we present a method for phasor-measurement-based calculation of voltage stability margins. In the case of complex transfer paths with multiple injections, a radial system approach may not be sufficient for voltage stability analysis. Our approach provides voltage stability margins considering the full fidelity of the transfer...
The use of power systems as close to their operating limits can cause instability if a disturbance is occurred. The damping of the system's oscillations can be obtained by conventional means such as voltage and speed regulation but also by Flexible AC Transmission System devices (FACTS). These devices are increasingly used in power systems. In this work, the Static VAR Compensator (SVC) was employed...
Transient stability analysis is an indispensible part of utility system planning. The industry standard for transient stability evaluation varies from region to region, but in a broader sense it requires the system to withstand severe disturbances. Since the inception and identification of stability problem in multi-machine power system, numerical method of iteratively solving the system Differential...
Kerala State Electricity Board (KSEB) as many other utilities uses breaker switched capacitor for voltage support and reactive power compensation in the largest Grid substation at Kalamassery. At present the installed capacity of the capacitor bank does not fully match with the system requirement which leads to a voltage collapse. Optimizing the use as an economical reactive power source is the key...
In this paper we suggest that a successful evolution of future electric energy systems will be critically dependent on having a systematic framework for communications and control architectures. These must be capable of ensuring stability and quality of frequency and voltage response in qualitatively different ways than it is currently being done. The main drivers of such change are described first...
In large interconnected power systems, Low frequency oscillations (LFO) are a well-known adverse phenomenon which may increase the risk of instability for the power system. This manuscript investigates the damping performance of the Static Var Compensator (SVC) equipped with an auxiliary controller based on Adaptive Neuro-Fuzzy Inference System (ANFIS). First of all, a modified Heffron-Phillips model...
The application of an adaptive pole shifting self tuning Static Var Compensator (SVC) to a multi area multi terminal HVDC system is described. The developed scheme employs generator speed deviation as a feedback signal through the proposed Proportional-Integral-Derivate (PID) controller to generate control input for the studied system. The self tuner for the static reactive power system control is...
The use of dynamic reactive power compensation devices, such as a Static Var Compensator or STATCOM, have been evaluated at power plants. The devices can be used to provide the dynamic reactive power allowing the generator to increase the active power output but maintaining the same power factor interconnection requirements. This paper describes how to evaluate a dynamic reactive power device for...
A coordinated nonlinear controller of static synchronous compensator (STATCOM) and generator excitation are designed according to the direct feedback linearization (DFL) theory and the T-S type fuzzy sliding mode variable-structure control (FSMC) theory. The proposed coordinated controller can improve both the power angle stability of generator and the voltage behavior at the STATCOM location. It...
This paper presents voltage stability in power systems when connected by wind farm generators. Two models of wind generator, namely squirrel cage induction generator and doubly fed induction generator are used and based on steady-state model. P-V curve is used to express maximum loading factor in power system when wind farm was installed. The test IEEE 14 bus system is selected to show proposed performance...
In this paper, a comprehensive time domain model for a wind park, suitable for stability analysis, is presented. The wind generator is modeled with a reduced order model for an asynchronous machine, whilst the wind turbine model takes into account the dimension of the turbine, the rotor blade and blade pitch angle. Each wind generator incorporates a STATCOM (static compensator) controller in order...
Power system dynamic stability includes two problems: power angle stability and voltage stability. For the former, the best way is to install power system stabilizer (PSS) on the key generator groups, and for the latter, however, Flexible AC transmission systems (FACTS) devices such as static var compensator (SVC), static compensator (STATCOM) and so on are the popular methods. PSS can effectively...
The efficacy and robustness of a nonlinear Power System Stabilizer (NPSS) in comparison with that of a series controlled FACTS device, the Static Synchronous Series Compensator (SSSC), is evaluated in this paper, to reinforce the transient stability of a multi-machine power system. The proposed controller is powered to control the three main parameters affecting the stability of the system; namely...
An indirect adaptive controller for a Static Synchronous Compensator (STATCOM) is designed to damp oscillations and enhance the stability of power systems. A combined on-line identifier and a Pole-Shift (PS) feedback controller, as an adaptive power system stabilizer, is applied to a STATCOM device connected at the middle bus of a single machine infinite bus system. A Kalman Filter as a parameters...
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