Emphasis in this paper is on the fault ride-through and grid support capabilities of multi-pole permanent magnet synchronous generator (PMSG) wind turbines with a full-scale frequency converter. These wind turbines are announced to be very attractive, especially for large offshore wind farms. A control strategy is presented, which enhances the fault ride-through and voltage support capability of such wind turbines during grid faults. Its design has special focus on power converters' protection and voltage control aspects. The performance of the presented control strategy is assessed and discussed by means of simulations with the use of a transmission power system generic model developed and delivered by the Danish Transmission System Operator Energinet.dk. The simulation results show how a PMSG wind farm equipped with an additional voltage control can help a nearby active stall wind farm to ride through a grid fault, without implementation of any additional ride-through control strategy in the active stall wind farm.
"Presently, more and more D-PMSG wind power generators are installed in remote areas or offshore where rural grids are normally weak and voltage unbalance caused by asymmetrical loads or grid faults usually may occur   . Actually, the wind power generation system is very sensitive to the grid disturbances even if the permanent magnet synchronous generator (PMSG) system is connected to the grid through a full-size NOMENCLATURE C common DC-link capacitance i g grid current vectors P f flywheel-side converter input active power P g , Q g grid-side converter output active and reactive powers P s machine-side converter output active power T ef electromagnetic torque of flywheel motor u dc common DC-link voltage u g grid voltage vectors θ g grid voltage angle ω synchronous angular speed ω f angular speed of flywheel motor "
[Show abstract][Hide abstract] ABSTRACT: Abstract—This article presents an enhanced control strategy for a direct-driven permanent synchronous generator based wind-power generation system with a flywheel energy storage unit. The behaviors of the direct-driven permanent magnet synchronous generator system with a flywheel energy storage unit under unbalanced grid fault conditions are investigated. Three control targets for the grid-side converter during network unbalance conditions are identified, including eliminating the oscillations in the total active power or reactive power or no negative-sequence current injecting into the grid. Meanwhile, the DC-link voltage oscillations can be effectively suppressed during the unbalanced grid fault by controlling the flywheel energy storage unit. Furthermore, a proportional–integral-resonant controller is designed for the flywheel motor to eliminate the oscillations in the DC-link voltage. Finally, the proposed coordinated control strategy for the direct-driven permanent magnet synchronous generator system with a flywheel energy storage unit has been validated by the simulation results of a 1-MW direct-driven permanent magnet synchronous generator wind power generation system with a flywheel energy storage unit under unbalanced grid fault.
Electric Power Components and Systems 06/2015; 43(8-10). DOI:10.1080/15325008.2014.990070 · 0.66 Impact Factor
"A new and simple control method for maximum power tracking in a variable speed wind turbine by using a step-up dc-dc converter has been discussed in . On the fault ride-through and grid support capabilities of multi-pole permanent magnet synchronous generator (PMSG) wind turbines with a full-scale frequency converter has been tested in . These wind turbines are announced to be very attractive, especially for large offshore wind farms. "
[Show abstract][Hide abstract] ABSTRACT: With the advances of power electronic technologies and permanent magnet materials, there have been great interest to direct driven permanent magnet synchronous generators (PMSG) among wind turbine manufactures. Since PMSG directly connected to the wind turbine, controlling of the power electronic converters has vital role at gearless connection. This paper presents grid side converter (GSC) control algorithm for a grid connected PMSG used in wind power conversion system. In developed system operation of the GSC are controlled by using vector control algorithm and a PLL algorithm is employed for compensation of phase difference between grid and GSC voltage. Operation of the system has been verified through simulation.
2013 International Conference on Renewable Energy Research and Applications (ICRERA); 10/2013
[Show abstract][Hide abstract] ABSTRACT: With a high penetration of wind turbines, the proportion of synchronous generation in the power system will be reduced at times, thus creating operating difficulties especially during frequency events. Therefore, it is anticipated that many grid operators will demand inertia response from wind turbines. In this article, different ways for emulating inertia response in full-rated power converter-based wind turbines equipped with permanent magnet synchronous generators are considered. Supplementary control signals are added to the controller of the wind turbine to extract stored energy from the rotating mass and DC-link capacitors. Simulations in MATLAB/Simulink show that the inertia response is improved by adding a term proportional to the rate of change of frequency and by extracting the stored energy in the DC-link capacitors.
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