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This paper investigates the stability of offshore wind farms integration through a modular multilevel converter-based high-voltage dc (MMC-HVdc) transmission system. Resonances or instability phenomena have been reported in between wind farms and MMC-HVdc systems. They are arguably originated due to interactions between the MMC and the wind power inverters. However, the nature of these interactions...
This paper presents some modulation features of a high-frequency link based on reduced matrix converter for offshore wind farms. The topology consists on a reduced matrix converter, a high frequency transformer and a full-bridge diode rectifier. The converter is operated as a current source. An experimental set-up of 10 kW was used to demonstrate the feasibility of the proposed modulation. Results...
The suitability of Superconducting Magnetic Energy Storage (SMES)-based energy systems has been widely tested in the field of wind energy, being able to supply power in cases such as low wind speeds or voltage dips and store energy when there are surpluses. The aim of this paper is to analyze, improve and compare the performance of two SMES-based systems that differ in the type of power converter...
This paper proposes a new topology for grid integration of small wind turbines. What distinguishes this proposal to conventional approaches is the series connection of the wind turbines. A pulse width modulated current source converter is used for controlling the entire turbine set and for direct integration with the AC grid. A simple control strategy based on a square relation between the voltage...
In this paper a shunt FACTS device composed of a matrix converter and a permanent magnet machine is suggested for reactive power compensation at the point of connection to the grid. The device can either provide pure reactive power compensation or reactive power compensation in combination with active power control. The conventional indirect space vector modulation (ISVM) scheme was first chosen to...
This paper investigates the implementation of a matrix converter for shunt reactive power compensation. The input of the matrix converter can be connected to the power grid and the output to a Permanent Magnet Synchronous Machine (PMSM). By controlling the input displacement angle Φi, the reactive power flowing into the grid can be controlled. To prove the concept of reactive power compensation using...
This paper presents a concept of high frequency link for offshore wind applications based on a reduced matrix converter oriented to reduce the size and volume of the elements in the nacelle. A modular approach aimed at increasing reliability of the conversion system, which can be used in series or parallel connection of the off shore grid is also presented. Features of the proposed conversion concept...
Split drivetrain configurations with multiple generators are one of the solutions for increasing the reliability and reducing the cost of wind turbines. The split drivetrain technology gives the ability to introduce multiple generators and by that reduces the gear size and facilitates variable-speed operation. This paper proposes a double input AC/AC nine-switch converter for direct conversion of...
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