Multi-pole permanent magnet synchronous generator wind turbines' grid support capability in uninterrupted operation during grid faults
ABSTRACT 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.
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ABSTRACT: Increasing penetration level of wind energy into the power system over the last decades has brought new issues and challenges. One of these concerns is the issue of low voltage ride through (LVRT). In this paper, given the characteristics of MW-level direct-drive wind turbines based on permanent magnet synchronous generator, a novel LVRT strategy is proposed, which is the combination of coordinate control of generator-side and grid-side converters and small un-loading branch. The implementation principle as well as calculation criteria are explained in depth. Finally, the feasibility of the proposed method is demonstrated by simulation results under balanced and unbalanced sag conditions.2012 7th International Power Electronics and Motion Control Conference (IPEMC); 06/2012
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ABSTRACT: A wind generator system model includes wind model, rotor dynamics, synchronous generator, power converter, distribution line and infinite bus. This paper investigates the low-Voltage Ride-Through capability of PMSG wind turbine in a variable speed. The drive train of a wind turbine on 2-mass modeling can observe the shaft torsional vibration when the low-voltage occur. To reduce the torsional vibration when the low-voltage occur, this paper designs suppression control algorithm of the torsional vibration and implements simulation. The simulation based on MATLAB/SIMULINK has validated at the transient state of the PMSG and an experiment using 3kW simulator has validated the LVRT control.The Transactions of the Korean Institute of Power Electronics. 01/2013; 18(3).
Conference Paper: Offshore wind farm with DC collection system[Show abstract] [Hide abstract]
ABSTRACT: This paper sets forth a novel dc-based topology utilizing series-connected permanent-magnet synchronous generators for offshore wind farms, as an alternative to the common ac topology. The system's design, namely, the individual wind turbine power electronics, the collection system topology, and the overall system control is presented. An efficiency analysis suggests that the proposed dc topology leads to energy savings due to the reduced number and different type of energy conversion stages, as well as a variable-voltage control strategy. The stability and operation of the multi-branch topology are briefly discussed.Power and Energy Conference at Illinois (PECI), 2013 IEEE; 01/2013