Abstract
Doubly fed induction generator (DFIG) based wind turbines are very sensitive to grid voltage variations. Therefore, low-voltage-ride-through (LVRT) and high-voltage-ride-through (HVRT) capabilities are employed to improve DFIG performance during grid faults and voltage swell events. In this paper, a superconducting magnetic energy storage (SMES) device with a PWM voltage source converter and a DC-DC chopper is proposed to enhance the DFIG LVRT and HVRT capabilities in an islanded microgrid simultaneously. The simulation results demonstrate that the SMES absorbs or releases energy from/to the microgrid during voltage swell events and fault condition respectively and consequently, improves the DFIG performance and enhances the DFIG LVRT and HVRT capabilities. The effectiveness of the proposed method is validated through detailed simulations in PSCAD/EMTDC.
Highlights
The growth of renewable energy resources usage in the form of distributed generation is led to the introduction of the idea of microgrid
Voltage swell caused by unbalanced faults, large loads switching off and large capacitor banks energizing induce a big electromotive force (EMF) and a surge current in the Doubly fed induction generator (DFIG) rotor which will endanger the normal operation of the DFIG [4, 5]
SIMULATION RESULTS The islanded microgrid shown in Figure 4, is simulated in PSCAD/EMTDC to validate the effectiveness of installing the superconducting magnetic energy storage (SMES) on the DFIG low voltage ride through (LVRT) and high voltage ride through (HVRT) capability
Summary
Abstract—Doubly fed induction generator (DFIG) based wind turbines are very sensitive to grid voltage variations. Low-voltage-ride-through (LVRT) and high-voltage-ride-through (HVRT) capabilities are employed to improve DFIG performance during grid faults and voltage swell events. A superconducting magnetic energy storage (SMES) device with a PWM voltage source converter and a DC-DC chopper is proposed to enhance the DFIG LVRT and HVRT capabilities in an islanded microgrid simultaneously. The simulation results demonstrate that the SMES absorbs or releases energy from/to the microgrid during voltage swell events and fault condition respectively and improves the DFIG performance and enhances the DFIG LVRT and HVRT capabilities. The effectiveness of the proposed method is validated through detailed simulations in PSCAD/EMTDC
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