Abstract
One of the ways of generating electrical power from wind energy is by employing the promising technology of the permanent magnet synchronous generator (PMSG) variable speed wind turbine (VSWT). With the daily increase and integration of wind farms into traditional power grids, it is imperative to carry out transient stability studies of wind generators in wind farms, in order to fulfill the operational grid codes. To solve the transient stability intricacies posed by the stochastic nature of wind energy during transient states or grid faults, this paper presents the enhancement of PMSG wind turbine considering the excitation parameters of the insulated gate bipolar transistors (IGBTs) of the wind generator. The investigation was carried out using the turn on and turn off resistances of the IGBTs of the power converters of the PMSG wind turbine, considering different scenarios, with and without over voltage protection scheme. A severe three-line-to-ground fault was used to test the robustness and rigidity of the controllers of the wind generator during transient state. Furthermore, the results obtained using the PMSG wind turbine were compared to those using the doubly fed induction generator (DFIG) wind turbine. The evaluation of the system performance was done using the power system computer “aided” design and electromagnetic transient including DC (PSCAD/EMTDC) platform. The same conditions of operation were used in investigating the various scenarios considered in this study.
Highlights
Based on the recent emerging grid requirements, wind farms are expected to have good performance under grid fault, considering the capability of voltage control
With a high insulated gate bipolar transistors (IGBTs) turn on resistance of 0.003 in scenario 3, the DC-link variable of the wind generator recovered on time, compared to a low resistance of 0.001 for IGBT turn on resistance (Ohm)
This is because an increase in the turn on resistance of the IGBTs of the permanent magnet synchronous generator (PMSG) wind turbine power converters would decrease the circulation of currents and boost
Summary
Based on the recent emerging grid requirements, wind farms are expected to have good performance under grid fault, considering the capability of voltage control. The multiresistors were connected in parallel with the insulated-gate bipolar transistor (IGBT) switches and were employed to provide a controllable discrete step resistance These enhancement schemes highlighted above were able to improve the performance of the PMSG wind turbine during transient state, they are additional circuitries to the PMSG wind turbines. The excitation parameters of the IGBTs that were investigated include the turn on and turn off resistances It has already been reported in Okedu and Barghash (2021) that the forward break over and reverse withstand voltages have no much effects on the transient performance of the variable speed wind generators. The variation of the forward break over and reverse withstand voltages of the wind generator power converter does not contribute to the wind turbine enhancement during steady state and grid fault conditions
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