A new hybrid multilevel back‐to‐back converter for doubly fed induction generator‐based wind turbines' fault supportability,International Transactions on Electrical Energy Systems

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A new hybrid multilevel back‐to‐back converter for doubly fed induction generator‐based wind turbines' fault supportability
International Transactions on Electrical Energy Systems ( IF 1.9 ) Pub Date : 2021-01-20 , DOI: 10.1002/2050-7038.12793
Arthur E. A. Amorim _{1,

2} , Flávio D. C. Oliveira ₃ , Domingos S. L. Simonetti ₁

Affiliation

Wind turbines based on doubly fed induction generator (DFIG) have been increasing their participation in electrical grid. However, for these turbines, grid faults are a great issue. During grid voltage transients, the EMF induced on rotor is increased due to the sudden flux variation. High EMF leads to high currents on rotor circuit that could be hazardous to power electronics converter. A novel hybrid multilevel converter is proposed in this article. The proposed converter is the combination of traditional three‐phase converter and monophasic full‐bridge inverters connected in series with each phase. Employing this topology, it is possible to produce higher voltages in rotor circuit, which can oppose the machine‐induced voltage during the faults, limiting hazardous currents on rotor circuit. The design procedure and the voltage control strategy for the proposed converter topology are presented. Simulation results, considering symmetrical and asymmetrical faults, are presented for a 2 MW turbine. Rotor currents are restricted near to their nominal values, which ensure safety operation for the structure, especially for the power electronics. These results demonstrate the potential to replace traditional solutions and the effectiveness of the proposal as a protection circuit for DFIG by limiting currents and keeping power under control during voltage dips.

中文翻译：

一种新的混合式多级背靠背变流器，用于基于双馈感应发电机的风力发电机组的故障支持能力

基于双馈感应发电机（DFIG）的风力涡轮机已经越来越多地参与电网。但是，对于这些涡轮机，电网故障是一个大问题。在电网电压瞬变期间，由于突然的磁通变化，在转子上感应的EMF会增加。高EMF会导致转子电路上产生大电流，这可能会对电力电子转换器产生危害。本文提出了一种新颖的混合多电平转换器。提出的转换器是传统的三相转换器和与每相串联的单相全桥逆变器的组合。采用这种拓扑结构，可能会在转子电路中产生更高的电压，从而在故障期间可以抵抗机器感应的电压，从而限制了转子电路上的危险电流。提出了所提出的转换器拓扑的设计过程和电压控制策略。给出了考虑对称故障和非对称故障的仿真结果，该结果适用于2 MW涡轮机。转子电流被限制在其标称值附近，从而确保结构，特别是电力电子设备的安全运行。这些结果证明了通过限制电流并在电压骤降期间将功率保持在可控范围内来替代传统解决方案的潜力，以及该建议作为DFIG保护电路的有效性。特别是对于电力电子。这些结果证明了通过限制电流并在电压骤降期间将功率保持在可控范围内来替代传统解决方案的潜力，以及该建议作为DFIG保护电路的有效性。特别是对于电力电子。这些结果证明了通过限制电流并在电压骤降期间将功率保持在可控范围内来替代传统解决方案的潜力，以及该建议作为DFIG保护电路的有效性。

更新日期：2021-03-02

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