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Power system stabilizer (PSS) is extensively used to enhance the angular stability by providing damping to the generator's oscillation. An electric torque is enforced in the rotor shaft in phase with the speed variation to provide this damping. In this paper a PSO based Robust Power System Stabilizer (RPSS) design has been proposed depending upon mixed sensitivity based H output feedback control in...
Cibatu34-Mandirancan is one of the most important subsystem in Jawa Bali system. Peak Load of this subsystem is about 1.700 MW, several industrial costumers are also located here. On 13th March 2014 disturbance occured on Indramayu-Kosambibaru. This disturbance was followed by tripping of two transmission lines and all generators in Indramayu Power Plant. Disturbance Fault Recorder (DFR) data showed...
This paper investigates the effect of wind speed variations on the small-signal stability of doubly-fed induction generator-based wind turbines equipped with modified virtual inertial controllers (MVIC). MVIC is a control scheme that prudentially emulates the inertial response of the conventional synchronous generators for wind turbines in order to improve their frequency control performance. It also...
Extension of share of renewable energy sources in energy mix is a big challenge for our community to increase energy security and fight against global warming by cutting emissions of GHG. The paper estimate wind turbines capacity that can be integrated in actual electrical system of Moldova without its reconfiguration. The study is based on analysis of power transformer stations operating on 110kV,...
In almost all European countries, the penetration of wind power systems and the wind turbines size continuously increases. Therefore, the grid code requirements are more and more restrictive concerning the necessity that the wind turbine to remain connected to the grid during a fault situation. This paper analyzes the possibilities to have more accurate wind generation transient stability models for...
The low voltage ride through (LVRT) capability is one of the critical requirements for distributed power generator connecting to power grid in many distribution codes, especially for the power grids with high penetration of distributed power generation. There has been much research conducted on LVRT capability enhancement for wind and solar power generators. This paper studies the applicability and...
This paper presents the development of single machine infinite bus system (SMIB) model for transient stability studies with detailed synchronous machine model and a Power System Stabilizer (PSS) in Matlab/Simulink software. The proposed method of the SMIB simulator is computationally efficient and flexible for interfacing the synchronous machine with the external network and for extending to multimachine...
With increasing penetration of renewable energy generators, such as wind doubly-fed induction generators (DFIGs), semiconductor based power converters are getting widespread applications into the traditional power system. Under this trend, future smart grid will become definitely a power electronic converters dominated power system. This change and evolution make it hard to describe the interactions...
In this paper, the stochastic excitations in single machine infinite bus power systems have been modeled as alpha-stable Levy processes. Through the simulations of the corresponding stochastic differential equations, we have shown that the impulsiveness and/or asymmetry in the distributions of the load fluctuations can cause the instability of the rotor angle. Hence, the synchronism is lost and the...
This paper proposes a coordinated control of wind turbine and energy storage system (ESS). Because wind power (WP) is highly dependent on variable wind speed and could induce a severe stability problem to power system especially when the WP has high penetration level. To solve this problem, many power generation corporations or grid operators recently use the ESS. It has very quick response and good...
Wind energy has attracted great interest as alternative source for electric power supply. However, its intermittent nature has been an issue of concern when integrated in power system. In this paper numerical technique based on generalised eigenvalues is used to investigate the influence of intermittent wind energy on small signal stability of power system. The result shows that the variation of power...
In this paper, we present THRUST, a Time domain simulation approach with Lyapunov exponent metHod for RobUST stabihty analysis of power systems. THRUST uses Lyapunov exponents method (LEM) for predicting both short-term voltage and angular stability. THRUST offers a novel system stability metric, which evaluates the system stability by considering both the voltage and relative rotor angles together...
A new method which achieves high accuracy in predicting the transient stability of power systems is presented. This study examines the application of Weighted Support Vector Machine (WSVM), ensemble WSVM and Adaptive Neuro Fuzzy Inference System (ANFIS) for prediction of post-fault transient stability condition. The performance of the ensemble classifier is compared with other methods for accuracy...
Small-disturbance angle stability or low-frequency oscillation is one of the important stability in the power system. Although damper windings and power system stabilizer (PSS) have been proved to stabilize and improve small-disturbance angle stability. However, due to increasing demand in the recent years, adding redox flow batteries (RFB) as additional devices is crucial. This paper investigates,...
In this paper, the behavior of doubly-fed induction generator (DFIG) under unbalanced grid voltage conditions is analyzed and a control strategy based on complex-vector-resonant regulator is proposed. Compared with the traditional PI regulator, the positive and negative sequence currents can be regulated without sequential-decomposition process and this control structure has strong robustness in parameter...
This paper proposes a new control method for enhancement of transient stability of synchronous generators in power system with variable speed wind generators (VSWG). Kinetic energy stored in a rotor of VSWG is actively used for the transient stability enhancement, which is controlled based on responses of the kinetic energy of each synchronous generator in the power system. The effectiveness of the...
The existence of new power injection at a system will effect system stability that existed before, so stability analyze was needed to know the system conditioning before and after power injection, and performance system after disturbance, by observe rotor angle, frequency, and voltage. The result of dynamic system show that power injection of Gen XY can supply 0,021 pu at bus 1, 0,001 at bus 2, 0,001...
Large scale integration of wind farm combined to the grid is a tendency for the development of the new energy, which causing the issue of low system inertia. Though analyzing the mode of operation and the Maximum Power Point Tracking strategy (MPPT)of double fed induction generator (DFIG), reviewing advantage and disadvantage of scholars' works on inertia control in the past few years, this paper...
This paper presents a developed linearized block diagram of a SMIB power system with a PSS which represents the dynamics behaviors of the power system. A fourth-order model for synchronous generator has been used. Finally, the simulation results show that the system for three loading conditions (normal, heavy, light) has outstanding operation in fast damping of oscillations of power system.
The ever increasing penetration of renewable and distributed electricity generation in power systems involves to manage their increased complexity, as well as to face an increased demand for stability and power quality. From this viewpoint, the energy storage plays a key role in the reliability and power quality of the power systems. Several energy storage technologies have been recently adopted to...
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