Ac-side Hvdc Interoperability

il y a 3 semaines

Villeurbanne, France Supergrid Institute Temps plein

**AC-side HVDC interoperability**:

- Réf
- **ABG-111992**
- Sujet de Thèse- 10/03/2023- Contrat doctoral- Supergrid Institute- Lieu de travail- Villeurbanne - Auvergne-Rhône-Alpes - France- Intitulé du sujet- AC-side HVDC interoperability- Champs scientifiques- Energie

**Description du sujet**:
**General Context**

Achieving multi-vendor multi-terminal HVDC interoperability is identified as a key target by the European Commission. The Horizon Europe InterOPERA project proposal is a unique initiative to define and validate the appropriate HVDC Interoperability frameworks, through the development of a real-time Demonstrator. It encompasses functional design and specification frameworks, control and protection subsystems integration test frameworks, cooperation frameworks, procurement frameworks. The Demonstrator development consists of the specification, engineering development and HIL (Hardware-In-the-Loop) integration test of the full control system of a multi-terminal HVDC grid with sub-systems provided by at least three HVDC manufacturers. This is a four-year project gathering 21 partners (Transmission System Operators, Off-Shore Wind developers, HVDC converter manufacturers, Off-shore wind turbine manufacturers,).

To support this work SuperGrid Institute plans to hire a research engineer who will carry out a PhD project related to the AC-side interoperability of multivendor multiterminal HVDC grids. The PhD project will especially address research issues that couldn’t be handled by the main operational resources of InterOPERA project Task 2.1, due to demonstrator-focused priorities, but remain important to be addressed before the conclusion of the InterOPERA project. Such research issues raised by Task2.1 will be processed through the PhD project, to contribute to Task2.3 and to project final conclusions.

**Description of the thesis topic**

HVDC interoperability can be classified into DC-side interoperability and AC-side interoperability. Whereas all converters belonging to a given DC grid must be interoperable on their DC-side, AC-side interoperability is not always a concern, this depends on AC-side system and configuration.

Nowadays, a HVDC converter connected to an offshore wind farm grid is controlled to form the AC wind farm grid frequency and evacuate the power generated by the farm: this control is often named Vf control. A single HVDC converter is connected to a single wind farm. Moving forward, new offshore wind will be connected through 2GW bipolar HVDC scheme, instead of 900MW monopolar HVDC scheme. It may then be beneficial for wind farm operation (availabity optimization), to interconnect through their AC-side, the positive pole converter and the negative pole converter. Both converters would then share the grid forming duty and the evacuation of the power, leading to AC-side interoperability issue (#1).

Down the road, HVDC-connected OWF will be required to provide onshore grid forming services. This requirement will lead to a new way of operating the OWF AC grid. Wind turbine converter will have to adjust their power output to the dynamic demand from the onshore side. In such scheme, the offshore HVDC converter and the Wind Turbine converters would need to cooperate, leading to AC-side interoperability issue (#2).

The PhD project may address this background context, as well as complementary scientific issues that would be raised during InterOPERA project.

**Scientific work**:
Work objectives and content will be defined according to Task2.1 inputs and research issues that are relevant to select for the PhD project, considering InterOPERA project aim.

**Objectives / Tasks**
- Bibliography and state of the art analysis
- Selection of scientific locks and research issues
- Electro-Magnetic-Transient (EMT) modelling of the HVDC system and the OWF system with its protection and controls,
- Theoretical approach of AC-side stability issues, based on simplified models,
- Formalization of AC-side control framework concepts and options
- Assessment of AC-side control framework options, also taking DC-side constraints into account
- Key findings validation, possibly on Supergrid HIL Simulation Platform

**Nature du financement**:

- Contrat doctoral**Précisions sur le financement**:
**Présentation établissement et labo d'accueil**:

- Supergrid InstituteEstablished in 2014, SuperGrid Institute is an independent private company with over 150 employees of 21 different nationalities. The institute is a key player for energy transition in France and throughout Europe, specialising in innovative high and medium voltage direct current (HVDC and MVDC) power systems. SuperGrid Institute also develops new technologies for the integration of renewable energies into the electricity networks of the future.

SuperGrid Institute has been ranked every year since 2018, reaching the podium 3 times in the INPI prize list.

**Site web**:
- Engineering degree (Master 2)
- Background required in Electri

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