Multi-terminal | Hitachi Energy

AxoniQ™

AxoniQ™ takes traditional HVDC systems to the next level, supporting efficient, reliable and scalable multi-terminal DC grids for the next step in asset and investment optimization.

The new era of DC grids

As global electricity demand accelerates, MTDC systems are becoming critical to ensuring a secure, affordable, and sustainable power grid. As renewable energy deployment accelerates and power systems become increasingly interconnected, MTDC systems help manage congestion and improve resilience by allowing dynamic power flow between multiple terminals and across different energy markets, while supporting faster planning, procurement, and execution of grid projects. By connecting multiple power sources and demand points, MTDC grids enable electricity to be directed where it is needed most.

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Increasing demand on electricity

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Renewable energy deployment accelerates

Higher interconnectivity between regions

MTDC is gaining strong interest today among transmission system operators and developers because the need of the power systems are changing rapidly. The increasing integration of renewable generation and expansion of cross‑border power exchange are driving higher demands for controllability, flexibility, and resilience.

What is MTDC?

MTDC stands for multi-terminal DC. While traditional HVDC systems are typically point to point connections, MTDC extends this concept into a DC Grid, where more than two terminals are connected. This allows power to be routed flexibly, delivering electricity where it’s needed and when it’s needed.

What is AxoniQ™ portfolio?

Marking a significant step toward greater interoperability, the launch of AxoniQ comes as governments and grid operators worldwide accelerate investments in transmission infrastructure toward a fully electrified world to integrate renewable energy at scale, strengthen cross-border interconnections, and improve energy security. The AxoniQ portfolio combines advanced power electronics and control technologies. It includes:

DC AxoniQ™ Protect

An innovative solution that can interrupt a DC fault in less than three milliseconds, it offers fast and effective protection at up to 525 kilovolts (kV). It enables selective fault isolation by disconnecting only the affected section of the DC grid, while the rest of the system continues operating. This continuous, proactive protection enables extremely low losses and the optimal combination of performance, efficiency, and reliability throughout the entire lifecycle.

DC AxoniQ™ Connect

A modular DC switching station that enables the connection of new terminals and structures the grid into several protection zones, creating manageable subsystems. AxoniQ Connect ensures reliable service continuity, simplifies maintenance, and supports cost-efficient scalability.

DC AxoniQ™ Control

An advanced control system built with interoperability in mind that maintains voltage stability and power balance, optimized power flow, and flexible, market-driven energy exchange. AxoniQ Control addresses congestion and enables quick reconfigurations in the event of disturbances.