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The maximum allowed per unit value of the synchronous reactance of a synchronous generator is normally decided by the grid codes in order to maintain the stability of the system. For the converter-fed synchronous hydrogenerator, the steady state stability can be maintained by the frequency converter. In this paper the constraint on the synchronous reactance is relaxed from 1.2 per unit to 2.0 per...
As wind turbines increase their power rating, the size and mass grows as well. The higher reliability is demanded in order to minimize the maintenance. Permanent magnet direct drive (PMDD) synchronous generators are a good solution since they omit the gearbox. While the large generator mass has been also a key difficult problem limiting the practical use of PMDD generator, which makes them difficult...
The present work proposes a methodology to obtain setting parameters of a power system stabilizer (PSS), through the implementation of search technique based on genetic algorithms (GA). To adjust the PSS using GA, the programming and dynamic analysis using Matlab / Simulink is performed, which includes the synchronous machine, excitation system and PSS, where the response of the machine to a disturbance...
In this paper, we have extended to the multimachine case our developed control model for SMIB stability improvement previously published. This model implements the fuzzy stabilizer in excitation and/or in turbine Governor systems (FLCE, FLCG and FLCEG). The optimal adjustment of the fuzzy logic controllers using genetic algorithm is carried out. Results obtained by nonlinear simulation using Matlab/Simulink...
Low frequency power system oscillations are damped with the help of conventional lead-lag Power System Stabilizer (PSS) by generating supplementary control signal for the excitation system. The primary function of Static Var Compensator (SVC) is to provide voltage control of long transmission lines. It can be utilized to damp power system oscillations. This paper presents robust tuning of Proportional...
This paper presents a study of tuning the existing power system stabilizers (PSSs) of the Saudi Electricity Company (SEC) power system and its effect on increasing the power transfer limit of the interconnection between Eastern Operating Area (SECE-OA) and Central Operating Area (SEC-COA). This work is also investigating the optimal location of installing additional power system stabilizers (PSSs)...
Wind energy systems have been emerging as a highly significant solution to the problem of limited traditional energy sources. In this paper, control methodologies adapted to wind energy systems are topically reviewed. oHard computing or control techniques such as proportional-integral-derivative (PID), optimal, nonlinear, adaptive and robust and soft computing or control techniques such as neural...
The risk of subsynchronous resonance (SSR) is likely in power stations which are connected to power systems through series compensated transmission lines. Wind farms are not exempted from this issue. Recently a new technology of wind turbines, i.e. dual-rotor turbines, has been introduced. The performance of this wind turbine is enhanced compared to a single-rotor turbine in both aspects of energy...
This paper focuses on designing of output feedback controller for PSS and TCSC based on genetic algorithm (GA) in order to damp the Low Frequency Oscillations (LFO). For this purpose a Single Machine Infinite Bus (SMIB) system with TCSC located at the terminal of generator has been considered. To earn the optimum values of the gains of the output feedback controller for PSS and TCSC, the GA has been...
In this paper, the application of Interline Power Flow Controller (IPFC) in damping of low frequency oscillations is investigated. An extended Heffron-Phillips model of a single machine infinite bus (SMIB) system is used to analyze the damping torque contribution of the IPFC in power systems. The potential of various IPFC control signals upon the power system oscillation stability is investigated...
Microgrids are low voltage intelligent distribution networks comprising various distributed generators, storage devices and controllable loads which can be operated as interconnected or as islanded system. The optimal generation scheduling is one of the important functions for the Microgrid operation. This paper describes a three-step efficient method for the optimal generation scheduling of a Microgrid...
This paper discusses the development of a high power Radial flux direct-drive PM generator for wind applications. A low-speed radial-flux permanent-electrical with new magnet (PM) generator topology was built and tested. The designed, optimized and constructed. This paper presents the design of a 20 kW permanent magnet generator using Neodymium-Iron-Boron. The finite element technique (FET) is used...
In this paper a multi-objective criterion function is introduced to maximize annual energy input (AEI) and minimize permanent magnet (PM) volumes in a permanent magnet synchronous generator (PMSG). First, a PMSG is designed and modeled analytically to achieve above mentioned targets. After that, effects of various generator parameters on the two above-mentioned objective functions are analyzed using...
The objective of this paper is to compare the permanent magnet synchronous generator (PMSG) systems for wind turbines with the different drive trains and power ratings by design optimization. The comparison is mainly based on the cost and annual energy production (AEP) for a given wind climate. Firstly, the analytical models of the wind turbine, the 1-stage and 3-stage gearbox, the 3-phase radial-flux...
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