Modular HVDC Converter Segmentation for Offshore Redundancy
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Solution Overview
Problem
Conventional HVDC converter systems are bulky, costly, and lack redundancy, making them challenging for remote or awkwardly situated installations such as offshore oil and gas production, wind farms, and mining districts, where maintenance and power reliability are critical.
Innovation Solution
A modular HVDC converter system comprising small, lightweight converter units connected in series, allowing for individual control and redundancy, enabling AC power with variable frequency and constant DC voltage, with plug-in connections for easy maintenance and redundancy features like reserve units and bypass switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional HVDC converter systems are used, then power transmission capability is achieved, but the system becomes bulky and difficult to handle during maintenance
Solution Approach 1:
The converter system is divided into multiple independent modular converter units that can be individually handled, installed, and maintained. Each module contains complete functional components (power electronics, control systems, cooling), enabling independent manipulation without affecting other units. This segmentation directly reduces handling difficulty and maintenance complexity while maintaining overall system power transmission capability.
2Reliability
If conventional HVDC converter systems are used, then power transmission is achieved, but redundancy is lacking and full power loss occurs upon failure
Solution Approach 1:
The system is segmented into independent converter modules, each capable of operating autonomously. When one module fails, others continue providing power, creating inherent redundancy without requiring complex backup systems. The modular architecture naturally distributes risk and maintains reliability through parallel operation of independent units.
Solution Approach 2:
The modular design incorporates spare capacity and redundant modules in advance, allowing the system to withstand component failures without interruption to overall power transmission. This prior cushioning approach ensures continuous operation by having backup modules ready to compensate for failures before they impact system reliability.
3Ease of manufacture
If conventional HVDC converter systems are used, then high power transmission is achieved, but space requirements and investment costs increase
Solution Approach 1:
By segmenting the converter system into standardized modular units, the overall space requirement is reduced through efficient packing and scalable deployment. Each module is compact and self-contained, allowing optimal space utilization. The modular approach also enables phased installation, reducing initial investment costs by allowing incremental system deployment rather than requiring complete system installation upfront.
Solution Approach 2:
The modular converter units are designed with universal applicability, where each module can serve multiple functions and be deployed in various configurations to meet different power transmission requirements. This universality reduces overall system cost by using standardized components across different applications rather than custom-designed systems for each installation.
4Ease of repair
If modular converter units are used, then handling and maintenance are simplified, but the number of connection points and potential failure interfaces increases
Solution Approach 1:
The modular design segments the system into independent units with standardized connection interfaces. While this creates multiple connection points, the standardization of these interfaces simplifies maintenance procedures and reduces the skill level required for repairs. Each module can be independently tested, replaced, or upgraded without affecting other units, greatly easing repair operations despite the increased number of interfaces.
Data Source
AI summary
Modular HVDC converter system (1) comprising a High Voltage Direct Current (HVDC) network (2), and two or more DC/AC converters (3) being connected in series to the HVDC 5 network, wherein each one of the DC/AC converters is arranged to provide AC to a separate AC load (4).