Abstract
This paper investigates the performance of a fault-tolerant four-switch three-phase (FSTP) grid-side converter (GSC) in a doubly-fed induction generator-based wind turbine (DFIG-WT). The space vector pulse width modulation (SVPWM) technique is simplified and unified duty ratios are used for controlling the FSTP GSC. Steady DC-bus voltage, sinusoidal three-phase grid currents and unity power factor are obtained. In addition, the balance of capacitor voltages is accomplished based on the analysis of current flows at the midpoint of DC bus in different operational modes. Besides, external disturbances such as fluctuating wind speed and grid voltage sag are considered to test its fault-tolerant ability. Furthermore, the effects of fluctuating wind speed on the performance of DFIG-WT system are explained according to an approximate expression of the turbine torque. The performance of the proposed FSTP GSC is simulated in Matlab/Simulink 2016a based on a detailed 1.5 MW DFIG-WT Simulink model. Experiments are carried out on a 2 kW platform by using a discrete signal processor (DSP) TMS320F28335 controller to validate the reliability of DFIG-WT for the cases with step change of the stator active power and grid voltage sag, respectively.
Highlights
To achieve the purpose of sustainable development, attention is being paid to clean energy resources [1,2]
Three different operation environments are considered for both the six-switch three-phase phase (SSTP) and four-switch three-phase (FSTP) grid-side converter (GSC) based doubly-fed induction generator-based wind turbine (DFIG-wind turbines (WTs)), which are the situations without external disturbance, with fluctuating wind speed, and with both fluctuating wind speed and grid voltage sag
To further investigate the low voltage ride through (LVRT) ability of doubly-fed induction generators (DFIGs)-WT with SSTP and FSTP GSCs, a low voltage period is considered from 0.02 s to 0.07 s, and during this period the voltage value decreases to half of the original value
Summary
To achieve the purpose of sustainable development, attention is being paid to clean energy resources [1,2]. Among all the renewable resources, wind energy has relatively high competitiveness [3,4]. It is estimated that the proportion of wind energy in the total power generation all over the world by 2050 will be 15–18% [5]. In large-scale wind turbine penetrated power systems, doubly-fed induction generators (DFIGs) are usually applied because of their variable speed constant frequency (VSCF) operating ability [6]. According to [7], 21% of of the power electronic devices in these converters leads to several issues. According to [7], 21% of the the faults in power converters are caused by breakdown of power electronic devices. If faults in power converters are caused by breakdown of power electronic devices. If one one of the switches in a three-phase power converter is broken, normal regulation of power flows is of the switches in a three-phase power converter is broken, normal regulation of power flows is lost
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