Jul 2012
Electricity Transmission
Protection and Fault Handling in Offshore HVDC Grids
Jul 2012
Jun 2017
National Grid Electricity System Operator and National Grid Electricity Transmission
Kevin Smethurst
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Network Innovation Allowance
Work Package 1: Review of offshore grid technologies: The work will start by gathering technical information from the partners, published material and previous research projects. Comprehensive case study will be defined.

Work Package 2: Modelling of power converters and DC grid components: In this activity models of converters and DC breaker will be developed for the analysis of electromagnetic transients in the offshore grids. The modelling approach will be generic so that the models are not confined to a single simulation platform.

Work Package 3: Analysis of component interactions during normal and fault conditions: Study work for the analysis of the interactions between components of an offshore grid i.e. HVDC with AC networks with numerical simulation will be carried out. Case study defined in WP1 will be used for the analysis of transient conditions. Further investigation will be done in real time environment for simulation of complex offshore grids.

Work Package 4: Protection strategies for offshore grids: Define strategies for the local faults and protection of offshore grids. Assess different fault detection systems and protection strategies. Selected strategies will be implemented in simulation programs to evaluate the effectiveness.

Work Package 5: Demonstration by experimental tests: The work includes creating a laboratory demonstration for multi terminal HVDC. The multi terminal HVDC system will be a benchmark system for the validation of the models developed in WP2 and to verify the findings of WP3 and WP4. The system will be available for educational activities, research work and industrial projects.

Facilitate a coordinated offshore transmission network as compared to a point to point or radial network.  Reduced cost for UK consumer (capital cost reductions and also a reduction in operational costs such as maintenance costs and congestion management costs in relation to system operation), and facilitating a flexible offshore transmission network that is better able to respond to future challenges.

  • Develop models of offshore grid components (cables, transformers, AC and DC breaker and HVDC converters) for electromagnetic transient studies.

  • Define guidelines to reduce the risk of unexpected interactions between components during normal and fault conditions.

  • Define strategies for protection and fault handling to improve the availability of the grid in case of failure.

  • Demonstrate the effectiveness of these tools with numerical simulations (PSCAD, EMTP), real time simulations (RTDS, Opal-RT) and experimental setup.

  • Expand the knowledge base on offshore grids.