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An alternative structure for variable speed wind turbine, using multiple permanent magnet synchronous generators (PMSGs) drive-train configuration and cascaded multilevel converter is proposed in this paper. This study presents a power electronic solution for the wind turbine. A transformer-less cascaded multilevel converter interface based on PMSGs is developed to synthesize a desired high ac sinusoidal...
This paper designs a damping controller for a superconducting magnetic energy-storage (SMES) unit to simultaneously achieve stability improvement and suppress tie-line active-power variations of a large-scale wind farm (WF) subject to wind-speed fluctuations. A complete system model based on a synchronously rotating reference frame for the studied WF combined with the SMES unit is properly derived...
Grid connected wind turbines are fluctuating power sources that may produce flicker during continuous operation. This paper presents a simulation model of a MW-level variable speed wind turbines with a permanent magnet synchronous generator (PMSG) and a full-scale converter developed in the simulation tool of PSCAD/EMTDC. Flicker emission of this system is investigated during continuous operation...
The paper discusses the operational domain of three phase voltage source converters (VSC) connected to an ac grid. The effects of the parameters (X/R ratio) of the conductors between the VSC and grid on the active and reactive power transfer are analyzed. The impacts on the control parameters, namely, the power angle and output voltage of VSC have been described. The study has revealed the active...
This paper proposes a novel scheme using a superconducting magnetic energy-storage (SMES) unit to simultaneously perform both power-flow control and transient stability improvement of a large-scale wind power generation system (WPGS) subject to severe wind fluctuations. A complete system model based on a synchronously rotating reference frame for the studied WPGS combined with the proposed SMES unit...
A large number of distributed generation (DG) units are being integrated into power systems at distribution level. Many of the DG units may be connected into power systems with power electronic interfaces, in particular, voltage source converters. Consequently, the operation and control modes of the voltage source converters determine the performance of the generation systems and play an essential...
The full-size converters for wind turbine systems can flexibly realize variable-speed control and meet power system operational requirements. The designs of two-level, three-level neutral point clamped and three-level flying capacitor converter as full-size back-to-back converters for large wind turbine system are discussed in this paper. The harmonic standard and power system operation requirements...
The objective of this paper is to investigate the most cost-effective individual direct-drive permanent magnet (PM) wind generator systems by using the system design optimization method. Firstly, the analytical models of a three-phase radial-flux PM generator with a back to back power converter are presented. The design optimization is developed with a genetic algorithm for the minimum generator system...
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