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The double-fed inductor generator (DFIG) is one important type of wind generator. Because of high percentage of wind energy, it is necessary to build accurate wind generator model and parameters for power system electro-mechanic simulation. The paper mainly presents the simulation model and parameter identification method of DFIG type wind generators. For power system transient simulation, the characteristic...
Increased penetration of wind generation into high voltage transmission systems necessitates development of grid integration standards. One of them is Fault Ride-Through (FRT) or Low Voltage Ride-Through (LVRT) guidelines. Development of the voltage envelope depends on the transmission network characteristics along with considerations like contingency and protective relay settings. This paper outlines...
It is proposed in this paper a methodology to obtain optimal controllers gains for the rotor-side converter of doubly fed induction generators (DFIGs) using a genetic algorithm approach. The main objective is to enhance the operational security and robustness of the power system, by a more effective contribution of the DFIG controllers to the system controllability. To reach this goal, the crow-bar...
The rotor of the doubly fed induction generator (DFIG) is fed back from the grid via back-to-back converters. Under the disturbance, the rotor current increases to maintain the terminal voltage and the rotor rotating speed of DFIG, while the current in the grid side converter also increases to keep the DC-Link voltage constant. In this situation, the overshoots of the currents flowing through the...
In this paper, analytical study on the impact of voltage sag in the internal dynamics of a grid connected Doubly Fed Induction Generator (DFIG) system is presented. A common dc-link of the rotor side converter (RSC) and grid side converter (GSC) supported static compensator (STATCOM) is proposed for the voltage ride through capability. The proposed system is connected to a small transmission network,...
This paper presents a dynamic model appropriate for power system analysis. This article shows modeling assumptions, derivation of a third order model for a doubly-fed induction generator and its controller models. Due to the detail level, it can be used as a tutorial for students and engineers that are new in this area. A four-bus system with one synchronous machine and one wind turbine is used to...
To investigate the dynamic response of WECS to the events in power system, an accurate simulation model for DFIG (doubly-fed induction generator) system is developed using PSIM and a hardware-in-loop simulator is implemented using 3 kW M-G set. The model consists of wind model, rotor dynamics, wound rotor induction generator, power electronics converter and control strategies. Control strategies can...
This paper presents details of the development of an equivalent wind farm model from power coherency aspect. Clustering wind generator units in a large wind farm based on coherency of the impacts during disturbance is used to arrive at equivalent model. Case studies are presented to illustrate this approach using DIgSILENT PowerFactory simulations. A good performance is achieved for all simulation...
Ocean wave and tidal current resources bear immense potential for generating electric power in near future. This article discusses an outline of generic system modeling for the purpose of grid interconnection studies. Due emphasis has been given on ocean energy's current state of the art and mathematical formulations are developed to fit the possible future needs. Ocean power schemes are approached...
The increasing penetration rate of wind generation in power system is likely to change frequency behavior of grid. This is due to the specific response of these technologies to frequency changes. In order to better assess these changes, this paper focuses on the primary frequency control requirements. It now appears that an active contribution of wind power will be required to cope with high level...
This paper discusses the modelling adequacy and control tuning of the doubly-fed induction generator (DFIG) for power system stability study. It is seen that the stator and rotor electrical dynamics should be considered when tuning the controllers. Once an appropriate set of control parameters are obtained the DFIG model is simplified whereby all electrical transients, both stator and rotor, are neglected...
With the penetration of wind power being higher and higher in power systems, the impact of wind turbine generation on inter-area oscillations should be fully investigated. This paper discusses the impact of a doubly fed wind turbine induction generator on the inter-area oscillation in a two-area four-machine system. Models of an induction generator and converter/inverter control loops developed by...
Increasing numbers of wind turbines are connected to electrical power systems. Wind turbines are based on technologies different from the synchronous generator, such as the squirrel cage induction generator and high or low speed generators that are grid coupled through a power electronic converter. When connected in small amounts, the impact of distributed generation on power system transient stability...
This paper presents an artificial neural network (ANN) based approach to tune the parameters of the SVC reactive power controller over a wide range of typical load model parameters. The gains of PI (proportional integral) based reactive power controller are optimised for typical values of the load voltage characteristics by conventional techniques. Using the generated data, the method of multilayer...
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