Control of a Doubly Fed Induction Generator in a Wind Turbine During Grid Fault Ride-Through

Abstract

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Effect of transient flux compensation control on fault ride through of doubly fed induction generator wind turbine

“…al. [5] propose a method where RSC generates rotor currents that oppose DC and negative sequence components of the stator flux linkage during a fault. The purpose is to cancel the transient flux in order to avoid rotor over voltage and RSC saturation.…”

“…Also, the RSC starts to feed reactive power to the network. In both [5] and [6], the operation of a grid side converter (GSC) is not taken into account.…”

Coordinated Control Strategies of VSC-HVDC-Based Wind Power Systems for Low Voltage Ride Through

“…The control strategy of PMSG WT during the LVRT period should be further improved to ensure the DC-link voltage stability. Some DC-link protection circuits which are easy to implement in engineering maybe used, such as Energy Storage System (ESS), DC chopper, pitch angle control, etc., [20][21][22][23][24][25][26], as shown in Figure 12. As shown in Figure 12a, the ESS uses a super capacitor as an energy storage battery, so it can not only absorb the energy when the DC-link is in overvoltage, but also can release energy when the DC-link voltage is too low, thereby maintaining the DC-link voltage within a certain range.…”

Transient stability enhancement of DC-connected DFIG and its converter system using fault protective device

“…DFIGs should therefore have good transient stability and fault ride-through capability [8]. The converter system can maintain its stability under some fault conditions [9,10], however, its capacity alone is insufficient to ensure its stability in severe cases. Therefore, additional devices are required.…”