Digital twins for health monitoring and fault detection in wind generators and converters

Project Description:

This PhD scholarship is offered by the EPSRC CDT in Offshore Wind Energy Sustainability and Resilience; a partnership between the Universities of Durham, Hull, Loughborough and Sheffield. The project is part of a Research Cluster focussing on Reliability and Health Monitoring. The successful applicant will undertake six-month of training with the rest of the CDT cohort at the University of Hull before continuing their PhD research at the University of Sheffield.

Reliability is of paramount importance for the offshore wind industry as the cost of maintenance, downtime and repair can markedly affect the business case for adopting new and innovative technologies.

To increase availability without increasing maintenance and associated downtime, condition and health monitoring to support fault detection and predictive maintenance are essential in offshore wind. Although many CHM tools are being investigated for the structural elements of a wind generator, little has been done for the electrical generators and power electronics converters which are at the heart of the energy conversion system.

The digital twin concept, based on an accurate real-time simulation of the real system, has emerged as a powerful tool for condition monitoring and predictive maintenance.

Digital twin concepts are gaining interest in the research and industrial communities as effective tools to support smart manufacturing, operation and monitoring of industrial processes and equipment.

Digital twins (DT) are multiphysics, multiscale, high-fidelity simulation that emulate in real-time the state of a corresponding physical twin based on historical and real-time sensors data. The comparison of physical and virtual data throughout product lifecycle can provide valuable information on the state-of-health of a physical structure. While extensive research is being undertaken on DTs for structural health monitoring in OW, there is little if any application of the DT concept to electrical equipment. This is mainly due to the difficulties of multi-time scale modelling in the electrical domain where dynamics can range from sub-milliseconds transients following a power electronics switching transient to thermal and mechanical induced gradual ageing and degradation taking place over the lifetime of the machine.

Using a combination of high-fidelity analytical models, model order reduction techniques and machine learning, this project will develop and validate a multi-time scale digital twin concept for advanced condition monitoring and maintenance of direct-drive permanent magnet generators and converters for offshore wind. The proposed digital twin, will be able to accurately model all electrical transients in the electric drive train, ranging from the sub-millisecond time-scale of the switching converter to long-term degradation over the lifetime of the machine. Comparison of the digital-twin output and the real-time measurements from a range of sensors, combined with advanced signal-processing tools, will be used to demonstrate the ability to detect both gradual degradation and faults in the machine.

Training and development

You will benefit from a taught programme, giving you a broad understanding of the breadth and depth of current and emerging offshore wind sector needs. This begins with an intensive six-month programme at the University of Hull for the new student intake, drawing on the expertise and facilities of all four academic partners. It is supplemented by Continuing Professional Development (CPD), which is embedded throughout your 4-year research scholarship.

Entry requirements

If you have received a First-class Honours degree, or a 2:1 Honours degree and a Masters, or a Distinction at Masters level with any undergraduate degree (or the international equivalents) in engineering, mathematics and statistics or physics, we would like to hear from you.

If your first language is not English, or you require Tier 4 student visa to study, you will be required to provide evidence of your English language proficiency level that meets the requirements of the Aura CDT’s academic partners. This course requires academic IELTS 7.0 overall, with no less than 6.0 in each skill.

The deadline for applications is Wednesday 4 December 2024.

If you have any queries about this project, please contact Prof Antonio Griffo, a.griffo@sheffield.ac.uk

You may also address queries about the CDT to auracdt@hull.ac.uk.

Watch our short video to hear from Aura CDT students, academics and industry partners:

Funding

The CDT is funded by the EPSRC, allowing us to provide scholarships that cover fees plus a stipend set at the UKRI nationally agreed rates. These are currently circa £19,795 per annum at 2025/26 rates and will increase in line with the EPSRC guidelines for the subsequent years (subject to progress).

Eligibility

Research Council funding for postgraduate research has residence requirements. Our CDT scholarships are available to Home (UK) Students. To be considered a Home student, and therefore eligible for a full award, a student must have no restrictions on how long they can stay in the UK and have been ordinarily resident in the UK for at least 3 years prior to the start of the scholarship (with some further constraint regarding residence for education). For full eligibility information, please refer to the EPSRC website.

We also allocate a number of scholarships for International Students per cohort.

How to apply

Please note, you may only apply for ONE project offered through the EPSRC CDT in Offshore Wind Energy Sustainability and Resilience.

Please ensure that you familiarise yourself with the Aura CDT website before you apply to give you a good understanding of what a CDT is, our CDT’s research focus and the training and continuing professional development programme that runs alongside the CDT. The Frequently asked questions page and Candidate resources page are essential reading prior to applying.

Applications are open until 4 December 2024.

Applications to this project are made via the University of Sheffield admissions system. If you have not applied to the University of Sheffield before, you will need to set up an account to enable you to track the progress of your application and upload supporting documents.

Follow this link to apply for CDT projects at the University of Sheffield:

https://www.sheffield.ac.uk/postgraduate/phd/apply/applying

With your application, you need to upload copies of the following supporting evidence:

• Complete transcripts (and final degree certificate(s) where possible). If your qualification documents are not in English, you will need to supply copies of your original language documents as well as their official translation into English.
• Your Curriculum Vitae (CV).
• A completed Supplementary Application Form (upload when asked for your Supporting Statement).

Uploading the form

When you have completed the form, please save it as a pdf format and labelled as follows:

Last name_first name PhD application form

Upload the form as part of your application documents through the University of Sheffield student application portal, when asked to add your Supporting Statement. The Form replaces the Supporting Statement and so you do not need to complete the Supporting Statement section. Please do not send your form directly to the Offshore Wind CDT.

Guaranteed interview scheme 

The CDT is committed to generating a diverse and inclusive training programme and is looking to attract applicants from all backgrounds. We offer a Guaranteed Interview Scheme for home fee status candidates who identify as Black or Black mixed or Asian or Asian mixed if they meet the programme entry requirements. This positive action is to support recruitment of these under-represented ethnic groups to our programme and is an opt in process. Find out more.

Interviews 

Interviews will be held during mid-January 2025.