AC Subsea Power Transmission Architectures, Design And Challenges, The Martin Linge Case

Skaanoey, Thomas; Kerin, Uros; Luijk, Nico Van; Thibaut, Edouard

doi:10.4043/27649-ms

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Besides, the experience from operational HVDC interconnections shows that in some cases costs had been underestimated [3]. Currently, the longest AC cable interconnection is the (single-circuit) 163 km 100 kV AC cable interconnection of the Martin Linge oil and gas platform with a design power of 55 MW [4].…”

Section: Introductionmentioning

confidence: 99%

Power system static and dynamic security studies for the 1st phase of Crete Island Interconnection

Kabouris¹,

Karystianos²,

Nomikos³

et al. 2022

joe

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The island of Crete is currently served by an autonomous electrical system being fed by oil-fired (Heavy fuel or light Diesel oil) thermal power plants and renewables (wind and PVs). The peak load and annual electric energy consumption are approximately 600 MW and 3 TWh respectively; wind and photovoltaic parks contribute approximately 20% of the electricity needs of the island. Due to the expensive fuel used, the Cretan power system has very high electric energy generation cost compared to the Greek mainland. On the other side the limited size of the system poses severe limitations to the penetration of renewable energy sources, not allowing to further exploit the high wind and solar potential of the island. According to the Ten Year Network Development Plan (TYNDP) of the Greek TSO (Independent Power Transmission Operator S.A. IPTO S.A.), the interconnection of Crete to the mainland Transmission System of Greece will be realized through two links: A 150 kV HVAC link between the Peloponnese and the Crete (Phase I) and a HVDC link connecting the metropolitan area of Athens with Crete (Phase II). The total length of submarine and underground cable of the HVAC link will be approximately 174km; it is at the limits of the AC technology and the longest and deepest worldwide at 150 kV level. A number of studies have been conducted by a joint group of IPTO and Hellenic Electricity Distribution Network Operator (HEDNO) for the design of this interconnection. This paper presents briefly the power system static and dynamic studies conducted for the design of the AC link and its operation. Firstly, the paper presents the main results of the static security study regarding the calculation of the maximum power transfer capability of the link and the selection of the reactive power compensation scheme of the cable. Results from dynamic security analysis studies are also presented. The small-signal stability analysis concludes that a new (intra-area) electromechanical oscillation is introduced to the National System after the interconnection. The damping of the electromechanical oscillations is sufficient; however the operation of power system stabilizers at power plants located both at the mainland and at Crete power system can increase significantly the damping of important oscillation modes. Finally with respect to the risk of loss of synchronism after a significant disturbance in the system of Crete, such as a three-phase fault (“transient stability”)- enough safety margin is estimated by means of Critical Clearing Time calculations.

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Section: Introductionmentioning

confidence: 99%

Power system static and dynamic security studies for the 1st phase of Crete Island Interconnection

Kabouris¹,

Karystianos²,

Nomikos³

et al. 2022

joe

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show abstract

“…A typical subsea electrical installation consists of subsea loads for pumping, gas compression and pipeline direct-electrical heating (DEH) applications [3,4]. In this kind of power system, the main goal is to keep the subsea power distribution stable by isolating only faulted components while keeping the rest of the equipment in operation.…”

Section: Introductionmentioning

confidence: 99%

Fault detection method in subsea power distribution systems using statistical optimisation

Nademi

Vanfretti

Pretlove

2020

IET Energy Systems Integration

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Developing automation solutions that enable remote communications, monitoring and control for subsea applications are key steps in designing subsea power distribution systems. These systems require fast local control to protect the multiple electrical loads and the capability of transferring prompt real-time trip signals. This study introduces a data-driven distributed fault detection and identification algorithm to monitor multiple subsea loads. The proposed scheme is divided into three steps. First, a stochastic hidden-Markov model (HMM) is developed to model the dynamic evolution of different potential conditions of multiple subsea loads. Simultaneously, the second step computes a model of the transition probability between the current operating condition and the potential response of an individual load. In the third step, using real-time measurements, the HMM is updated to predict an unobserved degradation of the load's current condition. This is achieved through an integrated perturbation analysis and sequential quadratic programming method. An assessment of case studies on subsea AC power system is presented, which includes different subsea motor loads for compressors and pumps. Results show robustness against uncertainty in measurement noise and changes in equipment mean time between failures, providing enhanced reliability.

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“…Moreover, the integrated interconnection of the southwestern Cycladic Islands (Thira, Folegandros, Milos, and Serifos) has been decided to be implemented in the following years [9,10]. A very long and high depth of laying subsea cable lines introduces a wide range of challenges that need special studies, design, and technology [11][12][13][14][15][16][17]. For example, the Crete-Peloponnese double circuit interconnection, which consists of a 135-km-long subsea part and a 43-km underground part on the Crete side, recently became the longest cable HVAC interconnection constructed in the world.…”

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confidence: 99%

Planning of Aegean Archipelago Interconnections to the Continental Power System of Greece

et al. 2021

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This paper presents the results of a thorough planning investigation carried out by the Transmission System Operator (TSO) and the Distribution Network Operator (DNO) in Greece in order to study the interconnections of the Aegean Islands with the mainland power system. The feasibility of interconnecting islands is based on the need for a reliable power supply to isolated and autonomous islands, reducing the operating costs of the power generation system through the withdrawal of high-cost oil-fired generating units, and the further ability to increase renewable energy source (RES) penetration in the country’s energy mix, according to directions imposed by the National Energy and Climate Plan. Among the alternative topologies and interconnection technologies considered, the final selection of the interconnection scheme selected for inclusion in the development plans of TSO and DNO was based on their detailed comparative evaluation, considering financial and other technical criteria.

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AC Subsea Power Transmission Architectures, Design And Challenges, The Martin Linge Case

Cited by 6 publications

References 2 publications

Power system static and dynamic security studies for the 1st phase of Crete Island Interconnection

Power system static and dynamic security studies for the 1st phase of Crete Island Interconnection

Fault detection method in subsea power distribution systems using statistical optimisation

Planning of Aegean Archipelago Interconnections to the Continental Power System of Greece

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