Innovative Hybrid Energy System for stable Power and Heat Supply in offshore oil &amp; gas Installation (HES-OFF): System Design and Grid Stability

Riboldi, Luca; Alves, Erick Fernando; Pilarczyk, Marcin; Tedeschi, Elisabetta; Nord, Lars O.

doi:10.1016/b978-0-12-823377-1.50036-7

Cited by 8 publications

(8 citation statements)

References 10 publications

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“…Mainly, a proper transient analysis of an ACPS must include voltage dynamics, which requires very detailed models and knowledge of the network topology and characteristics, time delays of controllers, and so on (Dörfler and Bullo, 2012). This level of detail is often not available during the planning phases of ACPSs and, still today, the swing equation model is a useful concept to evaluate the frequency response in the early design of a project (Delille et al, 2012;Egido et al, 2015;Riboldi et al, 2020) or in operation planning (Chang et al, 2013;Ahmadi and Ghasemi, 2014;Wen et al, 2016).…”

Section: Frequency Control In Ac Power Systemsmentioning

confidence: 99%

“…An initial techno-economical study of this installation (Riboldi et al, 2020) suggests that a reduction of up to 30% of its annual CO 2 emissions is possible when connecting it to a 12 MW offshore wind farm and employing an ESS based on 4 MW of proton exchange membrane (PEM) fuel cells and 6 MW of PEM electrolyzers. The main goal of this hydrogen-based ESS is to stabilize the wind farm output, allowing turbo-generators to operate with optimized setpoints and, hence, attaining higher efficiencies and lower emissions.…”

Section: Case Study: a Wind-powered Offshore Platform In The North Seamentioning

confidence: 99%

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Sizing of Hybrid Energy Storage Systems for Inertial and Primary Frequency Control

Alves¹,

Mota²,

Tedeschi³

2021

Front. Energy Res.

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The exponential rise of renewable energy sources and microgrids brings about the challenge of guaranteeing frequency stability in low-inertia grids through the use of energy storage systems. This paper reviews the frequency response of an ac power system, highlighting its different time scales and control actions. Moreover, it pinpoints main distinctions among high-inertia interconnected systems relying on synchronous machines and low-inertia systems with high penetration of converter-interfaced generation. Grounded on these concepts and with a set of assumptions, it derives algebraic equations to rate an energy storage system providing inertial and primary control. The equations are independent of the energy storage technology, robust to system nonlinearities, and rely on parameters that are typically defined by system operators, industry standards, or network codes. Using these results, the authors provide a step-by-step procedure to size the main components of a converter-interfaced hybrid energy storage system. Finally, a case study of a wind-powered oil and gas platform in the North Sea demonstrates with numerical examples how the proposed methodology 1) can be applied in a practical problem and 2) allows the system designer to take advantage of different technologies and set specific requirements for each storage device and converter according to the type of frequency control provided.

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Section: Frequency Control In Ac Power Systemsmentioning

confidence: 99%

Section: Case Study: a Wind-powered Offshore Platform In The North Seamentioning

confidence: 99%

Sizing of Hybrid Energy Storage Systems for Inertial and Primary Frequency Control

Alves¹,

Mota²,

Tedeschi³

2021

Front. Energy Res.

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“…Normally, a HES includes conventional fossil fuel-based power and heat generation as a backup option to deal with the irregularity of renewable power. Different HES configurations have been proposed and thoroughly assessed for several stand-alone systems [22], including offshore installations [16]. In particular, the authors of this paper designed and optimised a socalled Hybrid Energy System for stable power and heat supply in OFFshore oil and gas installations (HES-OFF) in a previous publication [17].…”

Section: Hybrid Energy System For Offshore Installationsmentioning

confidence: 99%

“…Another possibility is to couple renewable sources with energy storage in a hybrid energy system (HES). For instance, hydrogen storage along with electrolyser and fuel cell stacks can offset the irregular power contribution of offshore wind [16]. This concept maximises the exploitation of carbon-free renewable power while minimising the contribution of conventional power generation systems such as gas turbines (GTs).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Process Heat on the Decarbonisation Potential of Offshore Installations by Hybrid Energy Systems

2021

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An opportunity to decarbonise the offshore oil and gas sector lies in the integration of renewable energy sources with energy storage in a hybrid energy system (HES). Such concept enables maximising the exploitation of carbon-free renewable power, while minimising the emissions associated with conventional power generation systems such as gas turbines. Offshore plants, in addition to electrical and mechanical power, also require process heat for their operation. Solutions that provide low-emission heat in parallel to power are necessary to reach a very high degree of decarbonisation. This paper investigates different options to supply process heat in offshore HES, while the electric power is mostly covered by a wind turbine. All HES configurations include energy storage in the form of hydrogen tied to proton exchange membrane (PEM) electrolysers and fuel cells stacks. As a basis for comparison, a standard configuration relying solely on a gas turbine and a waste heat recovery unit is considered. A HES combined with a waste heat recovery unit to supply heat proved efficient when low renewable power capacity is integrated but unable to deliver a total CO2 emission reduction higher than around 40%. Alternative configurations, such as the utilization of gas-fired or electric heaters, become more competitive at large installed renewable capacity, approaching CO2 emission reductions of up to 80%.

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“…This power intensive industrial process is fed by two 35 MW gas-powered generators. A techno-economical evaluation [5] suggests that a 12 MW offshore wind farm would be able to reduce the GHG emissions of this platform by 30%. For mitigating the effects of wind intermittency and for allowing the turbo-generators to operate at higher efficiency ranges, an energy storage system (ESS) would be connected directly to the main busbar of the platform.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Effects of Exponentially Decaying DC Currents on the Dual dq Control of Power Converters in Systems with High X/R

Mota¹,

Tedeschi²

2021

Preprint

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This paper was accepted for presentation at the IEEE CPE-POWERENG 2021 conference held in Florence, Italy, between the 14th and 16th of July 2021.<div><br></div><div>It investigates the root causes of detrimental oscillations in the dc link voltage of an energy storage system using a dual dq controller, operating at a high-voltage ac grid with high reactance-resistance ratio. Dual dq controllers are recommended in the literature for power converters operating under unbalanced, fault, or reduced voltage conditions. They employ two separated rotating reference frames, one for the positive and one for the negative sequence. The causes of the oscillations are investigated both theoretically and by time-domain computer simulations. As a result of the simulations, the performance of two dual controllers used in the industry is compared. In the presence of exponentially decaying dc currents, the filtering techniques employed by the controllers affect differently the performance of the proportional-integral regulators and disturb the feed forwarding and dq decoupling schemes. Ultimately, this results in undesirable oscillations in the dc-link voltage. This paper sheds light on how a fundamental phenomenon of three-phase ac systems can critically affect the control of power electronic converters. It provides a valuable insight into a possible root cause of oscillations in large electrical system applications with a considerable power converter penetration, such as large industrial plants striving for reducing greenhouse gas emissions.<br></div>

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Innovative Hybrid Energy System for stable Power and Heat Supply in offshore oil & gas Installation (HES-OFF): System Design and Grid Stability

Cited by 8 publications

References 10 publications

Sizing of Hybrid Energy Storage Systems for Inertial and Primary Frequency Control

Sizing of Hybrid Energy Storage Systems for Inertial and Primary Frequency Control

The Impact of Process Heat on the Decarbonisation Potential of Offshore Installations by Hybrid Energy Systems

Understanding the Effects of Exponentially Decaying DC Currents on the Dual dq Control of Power Converters in Systems with High X/R

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