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.
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
- [Show abstract] [Hide abstract]
ABSTRACT: This paper deepens on the transient response analysis of the so-called vector proportional-integral (VPI) controllers and compares them with the popular proportional-resonant (PR) controllers for grid-connected applications. The employed methodology is based on the study of the error signal roots: both reference tracking and disturbance rejection abilities are considered for proper gain tuning. This paper proves that PR controllers lead to shorter settling times than VPI controllers. A three-phase voltage source converter prototype has been implemented. Experimental results comparing the transient behavior of VPI and PR controllers in different conditions are provided: a +90º � phase-angle jump in the current reference and a ‘type C’ voltage sag at the point of common coupling.IET Power Electronics 07/2014; 7(7):1714-1724. · 1.52 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: This paper proposes a DC-link voltage control method for the permanent magnet synchronous generator (PMSG) wind power system with a full-rated back-to-back converter, to improve the dc-link voltage dynamic response under normal operation and grid faults conditions. The dc-link voltage is controlled by the motor-side converter, while the grid-side converter is responsible for the maximum power point tracking. Considering the system nonlinear characteristic, a dc-link voltage controller is designed based on the feedback linearization theory. With this control scheme, the dc-link voltage responses much faster than other control structures. It can suppress the dc-link voltage fluctuation with the wind speed varying and prevent the voltage from rising too high under grid faults. The validity of the control algorithm has been verified by simulation with Matlab/Simulink, and the results show a better dc-link dynamic response with the proposed control scheme.Applied Power Electronics Conference and Exposition (APEC), 2013 Twenty-Eighth Annual IEEE; 01/2013