NSWPH MT HVDC Functional Requirements
The North Sea Wind Power Hub (NSWPH) consortium is responsible for planning and pre-developing a series of hub-and-spoke projects that will enable large-scale North Sea offshore wind deployment and its integration in the energy system. The hub-and-spoke are based on elementary block types that are used in association to build the distributed hub scenarios. The NSWPH methodology to develop the concept is structured in three phases: pre-feasibility (2020-2021), feasibility (2021-2022) and pre-FEED (2022-2023). This report focuses on pre-FEED phase and has the aim to assess from a transmission system operator (TSO) perspective how to derive and specify functional requirements as well as parameter ranges for radial and meshed multi-terminal HVDC systems and their associated modular HVDC building blocks based on an adequate Simplistic Test Benchmark (STB) environment. The STB consists of sub-benchmarks allowing to verify functional requirements and parameter ranges according to four functional groups: (i) DC control; (ii) DC protection; (iii) DC ancillary services and (iv) DC operational regimes.
The functional requirements and parameter ranges are iteratively improved throughout different use cases selected in the sense of expandability and future development stages of Multi Terminal HVDC systems from radial topologies, extended radial and meshed DC grid. Extensions of the use cases will increase the complexity of the MTDC grid and will challenge the proposed simplistic benchmark model. Lessons learned through this iterative process are incorporated into the simplistic test benchmark
