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Power system stability issues are extremely important for safe and effective operation of the system. They can be categorized as rotor angle, frequency and voltage stability issues. Grid connection of new generators can have significant impact on overall system performance and stability. This paper presents investigation of a wind farm transient stability under symmetrical three phase fault conditions...
This paper describes the feasibility of a large high speed doubly fed induction generator. The equivalent circuit parameters are found and both steady state and short circuit conditions are analyzed. Two cases are considered as faults, the three phase rotor short circuit and the single phase rotor short circuit. Short circuit currents, induced voltages in the rotor windings and the torque characteristics...
Distributed Generators (DGs) provide a number of advantages for utilities. So, they become very common these days. However, DGs can also negatively impact some aspects of distribution system such as Overcurrent (O.C.) protection. DGs are known to contribute fault currents to their interconnected power system. As a result, there is a concern that the DGs may affect the coordination of O.C. protection...
With recent proliferation of wind farms over the world, it has become important to study the short circuit characteristics of different types of wind turbine generators (WTGs). This paper describes the short circuit characteristics of a Type-II WTG, and a wind farm comprised of this type of generators. A commercial time-domain software is used to model the WTG and the wind farm. The machine model...
Demand for wind power has been tremendously increasing, as a result of which large Wind Power Plants (WPPs) with hundreds of generating units are being installed producing substantial power. Therefore, it has now become important to analyze the short circuit behavior of Wind Turbine Generators (WTGs) when connected to the utility grid. The short circuit behavior depends not only on the type of WTGs...
An important aspect of wind power plant (WPP) impact studies is to evaluate short-circuit current (SCC) contribution of the plant into the transmission network under different fault conditions. This information is needed to size the circuit breakers, to establish the proper system protection, and to choose the transient suppressor in the circuits within the WPP. This task can be challenging to protection...
Modern wind power plants are required and designed to ride through faults in the network, subjected to the fault clearance and following grid code demands. Beside voltage support during faults, the wind turbine fault current contribution is important to establish the correct settings for the relay of the protections. The following wind turbine generator during faults have been studied: (i) induction...
A new control strategy for improving fault ride-through capability of wind farms composed of fixed and variable speed wind generators has been proposed, in this study. In this new control scheme, a small series dynamic braking resistor (SDBR) is used in the stator circuit of doubly fed induction generator (DFIG) along with DC-chopper braking resistor. Simulation results show the advantages of the...
As remote and offshore wind turbines increase their contribution to renewable energy generation, effective and reliable condition monitoring techniques will be required to reduce failure downtime. This paper examines the possibilities for analysing electrical signals from the stator of wound rotor induction generators, commonly used in wind turbines. Previous work derived analytical expressions for...
An important aspect of wind power plant (WPP) impact studies is to evaluate the short circuit (SC) current contribution of the plant into the transmission network under different fault conditions. This task can be challenging to protection engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper presents simulation...
This paper describes the effect of electrical parameters of the induction generator on the transient voltage stability of a fixed speed wind turbine connected to a simple grid; the dynamic behavior of a wind turbine connected to the grid is examined. The model of the fixed speed wind turbine has been developed in the simulation tool Matlab/Simulink. Itpsilas composed by the induction generator, the...
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