Signal-Based Gas Leakage Detection for Fluid Power Accumulators in Wind Turbines

Liniger, Jesper; Sepehri, Nariman; Soltani, Mohsen; Pedersen, Henrik C.

doi:10.3390/en10030331

Cited by 13 publications

(3 citation statements)

References 23 publications

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“…Liniger et al [21] describes a method for detecting the changes in the pre-charge pressure of an accumulator. The method is based on wavelet analysis and uses a measurement of the fluid pressure close to the accumulator.…”

Section: Accumulatorsmentioning

confidence: 99%

Fault Detection and Diagnosis Methods for Fluid Power Pitch System Components—A Review

2021

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Wind turbines have become a significant part of the global power production and are still increasing in capacity. Pitch systems are an important part of modern wind turbines where they are used to apply aerodynamic braking for power regulation and emergency shutdowns. Studies have shown that the pitch system is responsible for up to 20% of the total down time of a wind turbine. Reducing the down time is an important factor for decreasing the total cost of energy of wind energy in order to make wind energy more competitive. Due to this, attention has come to condition monitoring and fault detection of such systems as an attempt to increase the reliability and availability, hereby the reducing the turbine downtime. Some methods for fault detection and condition monitoring of fluid power systems do exists, though not many are used in today’s pitch systems. This paper gives an overview of fault detection and condition monitoring methods of fluid power systems similar to fluid power pitch systems in wind turbines and discuss their applicability in relation to pitch systems. The purpose is to give an overview of which methods that exist and to find areas where new methods need to be developed or existing need to be modified. The paper goes through the most important components of a pitch system and discuss the existing methods related to each type of component. Furthermore, it is considered if existing methods can be used for fluid power pitch systems for wind turbine.

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Section: Accumulatorsmentioning

confidence: 99%

Fault Detection and Diagnosis Methods for Fluid Power Pitch System Components—A Review

2021

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“…Monitoring gas leakage in such accumulators can significantly reduce the risk, so that many signal-and model-based methods for fault detection in piston accumulators have been developed in the recent years (see e.g. [5][6][7]). Some manufacturers offer monitoring systems for piston accumulators, such as laser or cable position measurement systems and limit switches [8].…”

Section: Introduction 1hydraulic Systems In Wind Turbinesmentioning

confidence: 99%

Run-in Behaviour and Wear on Hydraulic Piston Seals – Evaluation of an Endurance Test for Piston Accumulators

Schulze,

Boyko,

Lenz

et al. 2024

14th International Fluid Power Conference

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Hydraulic accumulators are essential components in both industrial and mobile hydraulic systems, serving various purposes from energy storage to shock absorption and energy recovery. In hydraulic pitch systems of wind turbines, piston accumulators provide significant advantages, including reliability, resilience to centrifugal forces and temperature fluctuations, as well as simple monitoring. Ensuring a proper seal between the gas and oil sides of a piston accumulator and understanding its wear characteristics are crucial for a reliable operation of the system. A precise determination of wear often requires the use of measured values.The current paper presents the results of a 5,000-hour endurance test conducted for piston accumulators under load conditions typical for wind turbine applications and reveals insights into the run-in behaviour and wear process of the seals. During and following the test, parameters such as sealing geometry and surface roughness of inner accumulator tubes were measured. The accordance of the measured wear with Archard wear model behaviour is assessed. It could be shown that errorfree sealing conditions can be expected for a period of about 20 years.

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“…To make the pressure pulsation smaller, an accumulator filled with pressurized gas is usually employed. However, it is necessary to carry out regular maintenance of the accumulator to prevent its performance deterioration caused by gas leakage 7) . On the other hand, it seems to be significant to reduce the size of accumulator when making the size of oil-hydraulic system more compact.…”

Section: Introductionmentioning

confidence: 99%

Research on an Oil-hydraulic Component to Reduce Pressure Pulsation

Sakurai

HASHIMOTO

MAEHARA³

et al. 2022

JFPS International Journal of Fluid Power System

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Pressure pulsation in oil-hydraulic system is generated due to the use of a positive displacement pump and it causes oscillation, noise and so on. An accumulator is generally employed to suppress the pressure pulsation. However, accumulator needs regular maintenance to prevent its performance deterioration due to gas leakage from it. Furthermore, there is a case where it is difficult to make the size of oil-hydraulic system compact due to the size of accumulator. Therefore, it seems to be necessary for an innovation of an oil-hydraulic system to develop a new oilhydraulic component to reduce pressure pulsation. In this study, an oil-hydraulic component to reduce pressure pulsation is proposed. The feature of this component is that the structure is simple and the movement of an elastic tube is utilized to suppress pressure pulsation. The component is fabricated and some experiments are carried out to verify the mechanism to reduce pressure pulsation and to make clear its basic characteristics. Consequently, it is made clear that the proposed component and its mechanism are effective to reduce pressure pulsation. In addition to it, it is known that the proposed component can reduce the pressure pulsation of the downstream side of the component by about 43 % of that of the upstream side of it when the average pressure at pump discharge port is 3.5 MPa by setting both the gap width of the component and the hardness of the urethan rubber tube to suitable values.

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Signal-Based Gas Leakage Detection for Fluid Power Accumulators in Wind Turbines

Cited by 13 publications

References 23 publications

Fault Detection and Diagnosis Methods for Fluid Power Pitch System Components—A Review

Fault Detection and Diagnosis Methods for Fluid Power Pitch System Components—A Review

Run-in Behaviour and Wear on Hydraulic Piston Seals – Evaluation of an Endurance Test for Piston Accumulators

Research on an Oil-hydraulic Component to Reduce Pressure Pulsation

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