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Wind, Volume 4, Issue 2 (June 2024) – 2 articles

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24 pages, 7275 KiB  
Article
Green Hydrogen Driven by Wind and Solar—An Australian Case Study
by Glen Currie, Edward Behrens, Samuel Bolitho, Michael Coen and Thomas Wilson
Wind 2024, 4(2), 111-134; https://doi.org/10.3390/wind4020006 - 12 Apr 2024
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Abstract
The energy transition to wind and solar opens up opportunities for green hydrogen as wind and solar generation tend to bring electricity prices down to very low levels. We evaluate whether green hydrogen can integrate well with wind and solar PVs to improve [...] Read more.
The energy transition to wind and solar opens up opportunities for green hydrogen as wind and solar generation tend to bring electricity prices down to very low levels. We evaluate whether green hydrogen can integrate well with wind and solar PVs to improve the South Australian electricity grid. Green hydrogen can use membrane electrolysis plants during periods of surplus renewable energy. This hydrogen can then be electrified or used in industry. The green hydrogen system was analysed to understand the financial viability and technical impact of integrating green hydrogen. We also used system engineering techniques to understand the system holistically, including the technical, social, environmental, and economic impacts. The results show opportunities for the system to provide seasonal storage, grid firming, and reliability services. Financially, it would need changes to electricity rules to be viable, so at present, it would not be viable without subsidy. Full article
(This article belongs to the Topic Market Integration of Renewable Generation)
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21 pages, 2229 KiB  
Article
Fault-Tolerant Controller Applied to a Wind System Using a Doubly Fed Induction Generator
by Onofre Morfín, Diego Delgado, Alan Campos, Miguel Murillo, Jesús I. Hernández and Pedro Esquivel
Wind 2024, 4(2), 90-110; https://doi.org/10.3390/wind4020005 - 22 Mar 2024
Viewed by 458
Abstract
Wind systems are sustainable and economical options for producing electrical energy. These systems efficiently manage the power flow by maximizing wind power and consuming reactive power from the grid. In addition, wind systems must maintain operation despite utility grid electrical failure; hence, their [...] Read more.
Wind systems are sustainable and economical options for producing electrical energy. These systems efficiently manage the power flow by maximizing wind power and consuming reactive power from the grid. In addition, wind systems must maintain operation despite utility grid electrical failure; hence, their control system must not collapse. This study proposes a fault-tolerant converter controller to ensure the efficient operation of wind system converters. The central concept behind this is that when there is an imbalance in the utility grid voltage due to a fault nearby or far away, positive and negative sequence voltages are created in the time domain. Then, two parallel controllers operate to allow the wind system to continue operating despite the failure. One controller utilizes positive sequence voltages as inputs to regulate the generator’s electromagnetic torque. This helps in maximizing the amount of wind energy. The second controller uses negative sequence voltages as inputs, which helps to cancel out the produced torque in the opposite direction, thereby preventing generator overload. Finally, the controllers proposed in this article are validated through simulations, and the results are presented. Full article
(This article belongs to the Topic Advances in Wind Energy Technology)
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