Wind turbine transfer system MVDC PLUS®

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Overview
MVDC PLUS® is a medium-voltage DC transmission system combining DC transmission efficiency with AC-network flexibility to manage omnidirectional power flows caused by distributed generation and renewable integration. It provides an economic, flexible solution for regional transmission and distribution grid challenges.

MVDC PLUS®: A comprehensive solution
MVDC PLUS® supplies high-quality power output, supports bidirectional power flow, offers reactive power compensation and active load flow control, and can operate as a STATCOM for voltage control and reactive support.

Key capabilities

• High-quality power output
• Bidirectional power flow
• Reactive power compensation and active load flow control
• STATCOM operation capability (reactive power support and voltage control)

Reasons for interest in MVDC systems

• Increased transmission distances: efficient option for extended spans and improved power quality
• Distributed generation: manage stability and power quality with growing DER penetration
• Grid expansion and upgrades: enable flexible infrastructure expansion and reconnection
• Demand for transmission autonomy: DSOs seeking greater independence and operational flexibility

How MVDC PLUS® is applied (highlighted use cases)
Compact MVDC PLUS® links via cable or compact overhead lines for islands, offshore platforms and remote sites; MV overhead lines implemented at reduced heights (< 15 m) for lower visual impact and faster permitting; DC links to decouple grids with different frequencies or voltage levels; additional MVDC nodes to increase DSO independence; AC-to-DC conversion to boost capacity and avoid major AC network reinforcement.

Key features and benefits of MVDC technology
MVDC PLUS® uses modular multilevel voltage-sourced converter technology available in three standardized type ratings. It improves connectivity, increases capacity, reduces environmental footprint compared to equivalent AC expansions, and delivers economic efficiency.

Applications of MVDC technology

• Offshore wind power generation: efficient transmission from offshore farms to onshore grids
• Microgrids: enhanced performance and reliability for decentralized systems
• Transportation: power transmission for railways and EV infrastructure
• Subsea loads: reliable powering of subsea equipment
• Marine vessels: onboard power systems and stable energy management
• Data centers: efficient power management for high-demand operations
• Oil and gas rigs: dependable offshore power transmission
• Connecting small communities: enabling remote communities to access larger grids
• Backup power: robust solutions for outage resilience

Technical aspects
MVDC PLUS® implements a symmetrical monopole layout based on modular multilevel VSC technology. Converter stations produce near-ideal sinusoidal waveforms, support bidirectional flows, operate as STATCOMs for reactive compensation, and enable active load flow control to stabilize networks with intermittent renewable infeed.

Operational advantages and performance notes
Conversion from AC to MVDC PLUS® can increase transmission capacity (typical improvements reported in conversion scenarios: 20–80%). The system supports black start capabilities for remote area restart. MV OHL implementations can reduce visual impact (heights < 15 m) while enabling transmission up to approximately 150 MW per MVDC link.

Explore and resources
Technical resources such as a white paper and product flyer are available with datasheets and performance illustrations.

Caractéristiques / spécifications techniques

• Commercial model name: MVDC PLUS®
• Manufacturer / Brand: Siemens Energy
• Technology: Modular multilevel voltage-sourced converter (VSC) technology
• Topology: Symmetrical monopole layout (streamlined HVDC topology)
• Standardization: Available in three standardized type ratings
• Power transmission range (documented): designed for medium-voltage DC transmission, with implementations supporting approximately 30 MW to 150 MW per link
• Functional capabilities: bidirectional power flow, STATCOM operation (reactive power compensation and voltage control), active load flow control
• Applications: island/grid connections, offshore wind, microgrids, subsea loads, marine vessels, data centers, oil & gas rigs, remote community connections, backup power
• Infrastructure options: cable or compact overhead lines (MV OHLs can be implemented with reduced visual impact, heights < 15 m)
• Performance improvements when converting AC to DC: capacity increases typically in the range of 20% to 80% depending on application
• Environmental/space impact: compact and space-efficient implementation compared to equivalent AC expansions