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This paper studies the impact of a grid-connected wind farm on the harmonic resonances. The basic theory on the harmonic resonances is introduced as well as its consequences. The models of wind farm for resonance analysis are presented for both calculations and simulations. The resonance orders and amplifications of voltage distortion with different capacity of capacitor banks are studied under different...
This paper considers the influence of grid modelling accuracy on grid impedance characteristic in PCC and therefore harmonic voltages. Influence of power system model components like: capacitor batteries, lines, stiff grid and generators was investigated. Location of these elements and its impact on results was evaluated. Results for the basic system configuration and alternative network configurations...
With the development of renewable energy, distributed generations such as photovoltaic generation, wind power systems need to be connected to a utility power grid for the systems to work effectively as energy sources. Islanding detection is one of the most important techniques to develop for the distributed generation systems. A novel active islanding detection algorithm based in pseudo-random signal...
In the networking operation of wind power generation, grid-connected inverter is important for energy conversion and transmission. But the output current with harmonic component is increased due to the inverterpsilas low switching frequency of PWM signal. In order to reduce the harmonic current of grid-connected inverter, hybrid filter is used in the design of the grid-connected inverter in this article...
Recently the usage of distribution generation has significantly increased in the electric power distribution system. Wind generation system has potential application for the grid support. The voltage of the direct driven permanent magnet wind generators (PMSG) is variable due to the intermittent nature of the wind energy. Fluctuating voltage and power is of major concern in the converter based grid...
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...
This paper serves the idea of designing appropriate method for complex investigations of transient states in wind power plants. Proposed algorithms belong to two-dimensional time-frequency representations. Additional dimension allows to obtain simultaneous information about frequency of distortion components as well as its duration time. Two algorithms were proposed: short-time Fourier transform (STFT)...
In the grid new renewable resources are added to extract more power. This adds more of problems to grid connection. They are voltage fluctuations and harmonic distortion. In this paper various interfacing topologies are analyzed to get wind turbine power within the norms specified in IEC 61400-21. In this paper, a simplified control strategy is used. The front-end voltage source inverter is operated...
Renewable sources such as wind energy, hydro, tidal, etc. are intermittent in nature. While feeding the customer loads reliability and quality of the supply are of importance. Induction generators connected to the local grid may lead to severe power quality problems such as flicker, voltage dip. Further, unbalancing of the supply system may distort the supply voltage at the point of common coupling...
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