Reports
Assessment of two DC voltage droop options for small-signal stability in MMC-based Multi-Terminal DC Grids
October 2024
The interoperability of vendor controls is crucial to the success of multi-vendor, multi-terminal DC systems. This report delves into this by assessing two DC voltage droop control strategies designed to maintain small-signal stability in Modular Multilevel Converter (MMC)-based multi-terminal DC grids.
Key findings from the study:
- DC voltage droop control significantly influences the dynamics of multi-terminal DC grids (MTDC).
- Two DC voltage droop control strategies can coexist in a multi-terminal DC grid, despite some limitations regarding dynamic performance.
- DC reactors, essential components of DC circuit breakers, can negatively affect the damping of DC voltage.
This work is a significant contribution to Work Package 2 of InterOPERA aiming to ensure the interoperability and modular design of HVDC components from various suppliers.
Requirements for AC/DC converter stations, DC switching stations, Power Park modules and DC Grid controller offline models, SIL models and C&P cubicles
September 2024
The successful development of multi-vendor, multi-terminal HVDC grids hinges on having robust HVDC and wind power plant models and replicas that ensure seamless interoperability.
InterOPERA partners have collaboratively defined a comprehensive set of minimum requirements to guide the creation and use of these models and replicas while:
- addressing key challenges such as balancing accessibility with IP protection
- ensuring long-term usability, maintaining high performance, and
- providing thorough documentation for practical application.
This detailed effort has culminated in this report prepared by the experts of Work Package 1. It outlines around 150 well-justified and self-assessed requirements, designed to facilitate their effective dissemination and implementation.
Functional requirements for HVDC grid systems and subsystems
June 2024
InterOPERA aims to make HVDC multi-vendor multi-terminal projects reality. But to do so, we need a functional framework that limits the risk of interoperability issues between different vendors by specifying basic operational rules for control and protection.
This report describes functional requirements for multi-terminal HVDC systems and subsystems.
The functional framework is important to limit the risk of interoperability issues between different vendors by specifying basic operational rules for control and protection.
Summary report from the 1st technical workshop
May 2024
This is the summary report from the 1st technical workshop with the InterOPERA Stakeholder Committee that took place on 14 March 2024.
During the online workshop, the members of the Stakeholder Committee discussed and provided inputs on three reports:
- Definition of standard interface and requirements for vendors’ converter models and C&P cubicles.
- Minimum technical requirements for EMT offline, SIL and HIL simulation platforms and models to perform interaction studies.
- Demonstrator project definition and system design studies.
Demonstrator project definition and system design studies
March 2024
The demonstrator is the centrepiece of the InterOPERA project, since it is the infrastructure that will allow interoperability between technologies from different manufacturers to be tested.
The report includes:
- The assessment of the design and functionalities planned multi-terminal HVDC use-cases.
- The definition of a InterOPERA demonstrator for a multi-terminal multi-vendor system.
- The preliminary main circuit parameters and system design concepts for the InterOPERA demonstrator.
- The preliminary system design studies for the InterOPERA demonstrator from an asset owner perspective.
Grid-forming functional requirements for HVDC converter stations and DC-connected power park modules in multi-terminal multi-vendor HVDC systems
January 2024
This report presents the project stakeholders’ view on these requirements. It will be used as a basis for the demonstration design as well as the selection of the test protocol and verification process.
Among the main findings:
- Four different use cases of how grid-forming control could be applied in an HVDC system with and without support from the #windpower plants is proposed.
- The importance of coordinating grid-forming control with DC voltage control is discussed and highlighted.
Multi-Party Cooperation Framework
December 2023
This report is the preliminary draft of a Multi-Party Cooperation Framework, prepared by the InterOPERA Work Package 4 “Cooperation framework and governance”.
Smooth collaboration between stakeholders is the key to unlock the potential of Multi-Vendor Multi-Terminal (MVMT) High-Voltage Direct Current (HVDC) grids.
This Cooperation Framework:
- Establishes guidelines that will drive cooperation in the future MVMT HVDC project.
- Defines the roles, duties, and responsibilities of the different parties.
Newsletters
InterOPERA Newsletter
December 2023
This report is the preliminary draft of a Multi-Party Cooperation Framework, prepared by the InterOPERA Work Package 4 “Cooperation framework and governance”.
