DEMO 3 UPGRADING MULTI- TERMINAL HVDC LINKS USING INNOVATIVE COMPONENTS

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Jonah Lynch
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1 16 November 2015 DEMO 3 UPGRADING MULTI- TERMINAL HVDC LINKS USING INNOVATIVE COMPONENTS INNOVATIVE NETWORK TECHNOLOGIES AND THE FUTURE OF EUROPE'S ELECTRICITY GRID BEST PATHS DISSEMINATION WORKSHOP PARIS, 5 NOVEMBER 2015 Massimo Marzinotto TERNA

2 Converter technology Toshiba T&D Europe 3-terminal operation 2-terminal operation Vdc Vdc Vdc Pac Pac Pac On going R&D as of 30th October TOSCANY SARDINIA CORSICA TOSCANY SARDINIA CORSICA Characteristic of voltage margin control Vdc Vdc Pac Pac 0 Pdp Pdp 0 Pdp0 Vdc Characteristic of droop characteristic control a) Simulation Modelling A part of dc-line model is updated based on available information (e.g. cable, electrode lines, etc.) provided by TERNA. The other parts are modelled with assumed parameters for the OHLs, SCR of Corsica grid, etc. b) Simulation cases on normal operations System performance comparison between the voltage margin control and the droop characteristic control Pac 2

Converter technology Toshiba T&D Europe Ongoing R&D as of 30th October PSCAD/EMTDC Simulation progress Transition from 3-terminal to 2-terminal operation by voltage margin control Transition from

3 Converter technology Toshiba T&D Europe Ongoing R&D as of 30th October PSCAD/EMTDC Simulation progress Transition from 3-terminal to 2-terminal operation by voltage margin control Transition from 3-terminal to 2-terminal operation by droop characteristic control Steady states: Monopole operations: HB & FB HB Power-flow reversals: V-margin Ctrl & Droop Ctrl for HB (current direction reversal) V-margin Ctrl & Droop Ctrl for FB (voltage reversal method) Step-changes of power references: V-margin Ctrl & Droop Ctrl for HB Transition from 3-terminal operation to 2-terminal operation: V-margin Ctrl & Droop Ctrl for HB Transition from 2-terminal operation to 3-terminal operation Power-flow reversal 200 ms 3

4 RSE numerical simulation on the framework of SACOI intertie Network & VSC-HVDC model implementation Acquisition of a detailed network model of Sardinia (year 2015) provided by TERNA (370 buses); on going model verification and integration with dynamic controls of synchronous machines provided by TERNA; Mainland (eq) Implementation into DigSilent environment of a realistic sized Corsican grid model starting from models already available in RSE (42 buses). One-line diagram of implemented Corsican grid model with the AC & DC interconnections toward Sardinia and mainland equivalent 6

5 DE ANGELI PRODOTTI RECAP Preliminary study of the existing SA.CO.I. line ACSR Ø33,99mm (Italian side) AAAC Aster755 (French side) Definition of the conductors to be replaced The new solution will be studied starting from ACSR Ø30-35mm, because it s the most common conductor in Europe 9

DE ANGELI PRODOTTI - RECAP Technical meeting with CENELEC TC7X Entered technical committee IEC62818 Selection and characterization of innovative materials Internal preliminary test (mechanical and

6 DE ANGELI PRODOTTI - RECAP Technical meeting with CENELEC TC7X Entered technical committee IEC62818 Selection and characterization of innovative materials Internal preliminary test (mechanical and thermal properties) in progress, purchased a sample of a second innovative material first tests carried out Completed the revamping of the extrusion machine Installation completed with equipment trial One possible solution to give the protection to the core is the extrusion of an Al tube 10

7 HVDC Extruded Cables The cable design & Loop architecture have been identified Preliminary result allow for 400kV System tension Land Cable: 2500 mm 2 Al conductor Submarine Cable 1600 mm 2 Al conductor Design rating 600 MW per pole, VSC Depth 450m (already 400m laying force)

8 HVDC Extruded Field Joint

9 HVDC Extruded Factory Joint

10 The Mechanical PreConditioning

TERNA RSE HVDC insulators In tight collaboration with TERNA, definition of the final test procedure

11 TERNA RSE HVDC insulators In tight collaboration with TERNA, definition of the final test procedure to adopt on insulators (new and from service), on the base of preliminary RSE tests and CIGRE WG activities. Final set-up of the model for ionic currents and electric fields calculation, and its implementation in the 3D code (developed by RSE). Results from the model are in accordance with experimental results carried out in RSE Laboratories (and simplified models from literature). Application of the code for the calculation of ionic currents end e-field distributions on the Sacoi OHL configuration. 19

12 TERNA RSE HVDC insulators Acquisition of insulators (cap&pin with total and partial RTV covering), final setting up of laboratory configuration and starting of tests. Use of the code on other HVDC OHL configurations Output: Requirements and specifications for optimal sizing of insulation 20

Such measurement will be performed in Latina converter station of the SAPEI intertie.

13 TERNA cable fault detection on long interties in November induced current measurements are scheduled with the aim to infer the influence on the measurement of cable fault detection. Such measurement will be performed in Latina converter station of the SAPEI intertie. In parallel numerical simulation will be performed to access the interference level considering different operation configuration 21

Multi-terminal HVDC operation in a weakly interconnected system: results from Best Paths Demo 3

Multi-terminal HVDC operation in a weakly interconnected system: results from Best Paths Demo 3 E. Ciapessoni, D. Cirio, A. Iaria, A. Pitto, M. Rapizza RSE HVDC International Workshop Operational experience