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During a power swing, currents and voltages behave such as a fault. Therefore, power swing blocking function in distance relays is necessary to discriminate between a power swing and a fault. Otherwise power swings can be considered as a fault and causes relay trip. The main problem happens when during power sings a fault occurs. In this case, distance relays should be unblocked. In this paper, a...
In this paper, the generation expansion planning (GEP) is studied in independent power producers (IPPs) presence. The important points of this study are to determine type and capacity of power plants and optimal power purchase price of independent producers. Decreasing the utility company costs and the amount of carbon dioxide (CO2) emission are the main objectives of this planning. Finally the feasibility...
In this paper, a linear model of unified power flow controller is developed. The new features of the paper are as small signal modeling of UPFC based on the ideal transformer model, modeling UPFC with a coefficient like KUPFC instead of using a complicated model and proposing a modified linear block diagram. To illustrate the proposed model, a single-machine power system that consists of a synchronous...
In this paper, a simplified model of a micro-turbine, used as distributed generator, is obtained. The model is suitable for investigating the effects of inverter modulation index on the stability of micro-turbines. The proposed model is built from the nonlinear dynamic model of a micro-turbine and then linearized. The linear model is also simplified. To illustrate the proposed model, a sample micro-turbine...
In this paper different grounding systems of wind turbines will be proposed. For each grounding system the step and touch voltage will be obtained and the entire grounding system will be analyzed by boundary element method. The paper introduces a new grounding system which decreases the step voltage, touch voltage and grounding resistance. The MATLAB is used for programming and simulation of the proposed...
One of the most main protection requirements of grid connected wind turbines (WTs) is islanding detection and anti-islanding protection. In this paper, a new method for islanding detection of WTs based on THD of asynchronous generator currents is proposed. The new features of the proposed method are its application for wind farms with a large number of wind turbines under noisy windy conditions and...
For coordination of O/C relays, it is necessary to model the relay characteristics and calculate the time dial setting (TDS) of the relays. The O/C relays' characteristics are normally modeled by a polynomial using a curve fitting technique. A new method for calculating the TDS and t (operating time of O/C relays) based on a neural network and fuzzy logic is used. In this method, fuzzy logic uses...
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