Marine Electrical Systems Design

SiC and GaN drives deliver real efficiency gains. They also generate noise that older vessel electrical systems were never designed to handle. Wide-bandgap semiconductors switch at 10-100× the speed of traditional IGBTs. dV/dt rates can exceed 50 kV/μs. That's excellent for efficiency and a significant source of high-frequency common-mode noise. On a vessel with a shared DC bus, this matters more than on land: ▸ The DC bus acts as an antenna for high-frequency switching transients ▸ CM noise couples into adjacent equipment through stray capacitance and shared grounding paths ▸ Existing CM filters, which are designed around IGBT switching frequencies, lose insertion loss at the higher harmonics WBG devices produce ▸ Thermal management solutions for SiC/GaN often introduce additional parasitic capacitance paths to the structure We've worked on vessels where a drive upgrade (to a fully certified unit) introduced faults across the entire bus. The converter passed compliance testing in isolation, but the integration created the problem. The right diagnostic question isn't "is this drive compliant?" It's "how does this converter interact with everything else on the bus?" That's a system-level question and it requires a system-level investigation. #SiC #GaN #PowerElectronics #MarineHybrid #EMI #DCBus #MarineElectrical #PowerElectronics #EMC #MarineEngineering #CommonModeNoise #ElectricPropulsion #Electromagnetic #Interference #Noise #RootCauseAnalysis #Filter

If you are following the new build market for ferries you might be asking why are low voltage DC (LVDC) systems becoming so popular? As the marine industry continues to prioritize efficiency, emissions reduction, and system flexibility, LVDC propulsion systems are becoming increasingly relevant—especially when compared to traditional AC and diesel-mechanical configurations. Key Technical Advantages of LVDC Propulsion: 1. Superior Energy Efficiency: LVDC systems reduce conversion losses typically associated with AC systems (e.g., AC/DC or DC/AC conversions). With fewer power conversions and the ability to directly interface with DC-based energy storage (such as batteries), overall energy throughput improves significantly. 2. Enhanced Integration with Renewable and Hybrid Energy Sources: Batteries, solar arrays, and fuel cells operate natively on DC. By leveraging an LVDC bus, vessels can integrate these technologies without relying on complex and lossy AC-DC converters. This makes LVDC an ideal backbone for hybrid or fully electric propulsion architectures. 3. Improved Redundancy and System Resilience: Modular LVDC systems enable distributed power generation and load-sharing across multiple nodes. If one part of the system fails, other segments can continue operating independently, enhancing reliability in mission-critical applications. 4. Smaller Footprint and Weight Savings: Without the need for bulky AC switchgear, transformers, and synchronization equipment, LVDC systems can reduce both the physical footprint and weight of the electrical distribution system—freeing up valuable space and improving vessel performance. 5. Simplified Control and Higher Power Quality: LVDC propulsion allows for finer control of motor speed and torque. Additionally, issues like reactive power, frequency instability, and harmonics—common in AC systems—are either minimized or eliminated. 6. Reduced Maintenance and Operational Costs: Diesel-mechanical systems involve complex shaft lines, gearboxes, and frequent servicing. Electric propulsion—especially in LVDC configurations—eliminates many of these components, reducing maintenance intervals and increasing uptime. As the marine sector accelerates toward decarbonization and digitalization, LVDC propulsion is not just an alternative—it's a forward-compatible platform for the vessels of tomorrow. If you're exploring vessel electrification, hybridization, or system upgrades, it's worth taking a closer look at what LVDC

Electrical fundamentals are at the core of every subsea control system. The symbols here may look simple, but offshore they define the architecture of complex subsea networks that keep wells producing safely and reliably. In subsea applications: Switches, fuses, and relays form the backbone of Subsea Control Modules (SCMs), protecting circuits and ensuring reliable switching under high pressure. Transformers step down topside power for subsea distribution, while maintaining efficiency over long umbilical distances. Capacitors and inductors support filtering and signal integrity in multiplexed communication systems. Motors and actuators convert electrical signals into hydraulic or direct mechanical movement for tree valves and chokes. Grounding and insulation monitoring protect equipment against failures in harsh subsea environments. At depths exceeding 3,000 meters, every component—from a fuse to a transformer—must perform flawlessly. A single fault can mean hours of downtime and millions in deferred production. That’s why subsea engineers must bridge fundamentals with advanced control system design. It’s not just about knowing the symbols—it’s about applying them to ensure reliability where maintenance is nearly impossible. #subsea #oilandgas #offshore

Do you know how electricity is generated and distributed on an FPSO, in the middle of the high seas ? Imagine a floating city, isolated hundreds of kilometers from the coast, producing oil and gas 24 hours a day. For everything to function accurately pumps, valves, safety systems, lighting, accommodations one essential thing is needed: reliable electric power. But where does this energy come from in a floating unit like an FPSO (Floating Production Storage and Offloading)? On the FPSOs, electricity is generated on board using gas turbines, diesel generators, or a combination of both. In many cases, the gas produced by the well itself is used as fuel. This brings autonomy and efficiency to the operation. These generators power the entire plant, from the oil processing systems to the crew's hospitality services. INTELLIGENT DISTRIBUTION After generation, the energy is distributed through electrical panels, motor control centers (MCCs), and transformers that adjust the voltage as needed: High voltage for large motors (such as pumps and compressors); Low voltage for lighting, automation, and control systems. REDUNDANCY: THE KEY TO RELIABILITY Since failure is not an option in the middle of the ocean, every electrical system on a FPSO is designed with redundancy: ✅ Multiple generators operating in parallel ✅ UPS (uninterruptible power supplies) for critical systems ✅ Panels and cables with alternative routesIn other words, even if one system fails, another takes over without stopping the operation. TRENDS: EFFICIENCY AND SUSTAINABILITY In recent years, many operators have been investing in technologies to make energy generation more efficient and less polluting: Heat recovery for steam generationOptimization of excess gas usageStudies for integration with renewable sources in the near future. 💬 AND YOU? Have you ever had the experience of working on an FPSO or designing offshore electrical systems? What surprised you the most about this type of operation?Or maybe you are just entering this world and want to know more about how all this works? 👉 Share here in the comments: What challenges have you faced in the offshore electrical system? What solutions have you seen that really worked? Let's exchange knowledge! 👇👇👇 #FPSO #OffshoreEnergy #ElectricalEngineering #OilAndGas #OffshoreEnergy #IndustrialProcesses #EnergyAtSea

Do you know how electricity is generated and distributed on an FPSO, in the middle of the high seas ? Imagine a floating city, isolated hundreds of kilometers from the coast, producing oil and gas 24 hours a day. For everything to function accurately pumps, valves, safety systems, lighting, accommodations one essential thing is needed: reliable electric power. But where does this energy come from in a floating unit like an FPSO (Floating Production Storage and Offloading)? On the FPSOs, electricity is generated on board using gas turbines, diesel generators, or a combination of both. In many cases, the gas produced by the well itself is used as fuel. This brings autonomy and efficiency to the operation. These generators power the entire plant, from the oil processing systems to the crew's hospitality services. INTELLIGENT DISTRIBUTION After generation, the energy is distributed through electrical panels, motor control centers (MCCs), and transformers that adjust the voltage as needed: High voltage for large motors (such as pumps and compressors); Low voltage for lighting, automation, and control systems. REDUNDANCY: THE KEY TO RELIABILITY Since failure is not an option in the middle of the ocean, every electrical system on a FPSO is designed with redundancy: ✅ Multiple generators operating in parallel ✅ UPS (uninterruptible power supplies) for critical systems ✅ Panels and cables with alternative routesIn other words, even if one system fails, another takes over without stopping the operation. TRENDS: EFFICIENCY AND SUSTAINABILITY In recent years, many operators have been investing in technologies to make energy generation more efficient and less polluting: Heat recovery for steam generationOptimization of excess gas usageStudies for integration with renewable sources in the near future. 💬 AND YOU? Have you ever had the experience of working on an FPSO or designing offshore electrical systems? What surprised you the most about this type of operation?Or maybe you are just entering this world and want to know more about how all this works? 👉 Share here in the comments: What challenges have you faced in the offshore electrical system? What solutions have you seen that really worked? Let's exchange knowledge! 👇👇👇 #FPSO hashtag #OffshoreEnergy #ElectricalEngineering #OilAndGas #OffshoreEnergy #IndustrialProcesses #EnergyAtSea

ROV Design 101 - Mixing Electricity and Water 10 tips to get power to the bottom of the ocean ROVs are generally power hungry, and they already need a tether for communication and control, so why not send power down there? In many cases, the ROV must remain submerged for days or weeks at a time, such as surveying subsea power cables, so power is a must. Here are some tips: 1. Determine how much power is needed at the vehicle first, then tether losses, then add a bit to the surface supply. 2. For 6, 7 and 8 thruster systems, enough power to run all thrusters at 100% plus all accessories is idea, but 10% more is good and 30% less is sometimes acceptable. 3. For 3, 4, and 5 thruster systems, have power to run everything at 100%. 4. Cables have resistance, the longer/smaller the cable, the higher the resistance and the greater the power loss. Increase the tether voltage until the tether conductor diameter and operating voltage are both reasonable. 5. Power converters, tethers, connectors, and safety equipment come in discrete voltage ranges, select the highest common tether voltage that will keep power losses between 10 and 40%. Common ranges are: a. 48-72VDC - suitable for very small systems and short tethers only b. 120-240VAC - small vehicles <1kW and tethers < 300m c. 300-400VDC - common ROVs <5kW and tethers <1km d. 440-660VAC - common for medium sized ROVs, tether < 500m e. 600-1,000VDC - common for medium ROVs, <10kW, tether <1km f. 3,000-6,000VAC - Work class and small/med deep ROVs, tether >1km 6. NEVER use mains AC voltage directly, always use an isolation transformer and earth leakage or line isolation monitor and circuit breaker! The ROV must shut off if more than about 10-30mA leaks into the water. DC supplies must also be isolated and have an isolation monitor ($$). 7. "It's cold in the ocean" use the subsea housing to dissipate heat. 8. "Power management" is critical to ensure the ROV cannot draw more power than can be provided. If the supply is smaller than the total possible load, it must be able to reduce voltage or the flight control software must be able to limit the power required by the vehicle. For this reason, ridged regulation isn't desirable. 9. Maximizing the power density is critical to reducing costs, most off the shelf solutions are too big. Use a good DC:DC converter, such as VICOR DCM or BCM series, and design an application specific PCB/housing. 10. Testing is critical. Changes in tether length, accessory power, or the ship's supply source can and will cause unforeseen problems. Build a resistive load bank for bench testing, buy the actual tether to be used, and invest in a good Oscilloscope to identify potential problems. #PoseidonRobotics #ROV #Engineering #OceanExploration #VicorPower #OceanX #LanaiROV

⚡️Parallel operation of Generators onboard, every engineer should know: Why parallel operation?: - share electrical load during high demand (e.g., cargo ops, maneuvering) - ensure redundancy in case one generator fails - maintain essential systems without interruption 3 conditions for synchronization: - voltage match - generator voltages must be nearly equal - frequency match - frequencies must be within 1–2% - phase sequence & angle - must match exactly before closing breaker 💡If you close the breaker while out-of-sync, expect: - High torque shock - Reverse power trips - Damaged AVRs or even generator windings What’s usually Synced onboard?: - 440V systems for aux equipment - 3.3/6.6 kV high-power drives - DFDE LNG vessels often have 3-4 gen sets working in flexible load-sharing mode PRO Tip - watch out for: - Uneven load sharing → faulty droop settings - Reactive power imbalance → poor power factor, overheating - Synchronizer failure → needs manual control skill! Best Practices: - check governor and AVR droop settings - always verify phase rotation (especially post-maintenance) - use manual sync only when AUTO mode is down, and you’re trained for it Working on LNG/LPG carriers, tankers, or offshore rigs? You need to know this inside out. 👉 Join our LNG Toolbox community for expert breakdowns, real troubleshooting cases, and systems-level training from onboard: https://lnkd.in/dGijuWTH #PRO_LNG | #marineengineering #shippower #LNGCarrier #generatorsync #electricalsystems #seafarertips

🚢 DC Shipboard Power System (SPS) architectures for all-electric ships (AES) compared in the study are radial, ring, zonal, hybrid AC-DC, and breaker-and-a-half (BAAH) topologies. The radial topology employs a central DC bus that connects all modules, while the ring topology utilises port and starboard DC buses linked at the vessel's ends via DC circuit breakers. The zonal architecture groups loads into zones, with each zone connected to both port and starboard DC buses. The hybrid AC-DC system incorporates both AC and DC buses interconnected through power electronic converters. Finally, the BAAH topology uses two longitudinal busbars interconnected by bays containing circuit breakers, providing redundancy at the module level. One topology not compared is the open bus topology, which is the simplest and can offer advantages for small vessels.   🔋 Comparing the architectures based on their performance trade-offs, the figures show that the BAAH topology offers the highest reliability, closely followed by the zonal and ring topologies, while the radial topology presents the lowest reliability. But the simple radial topology excels in affordability, efficiency, simplicity, and power density, with the zonal and BAAH architectures performing somewhat worse in these aspects. Interestingly, the zonal topology offers higher survivability compared to BAAH. These trade-offs are achieved by different utilisation of high-voltage high-power components, revealing that the zonal and BAAH topologies generally require a higher number of components, particularly inverters and DC-DC converters, which contribute to their increased complexity and cost. The radial and hybrid topologies on the other end have a lower component count.   ⚡ A critical challenge in DC-SPS design is fault protection due to low fault impedance and resulting extreme fault current rise; the traditional AC circuit breakers are ineffective under these conditions. Solid-state DC circuit breakers play a crucial role in breaker-based protection strategies, offering the potential for rapid fault isolation. For a unique solution for this challenge check out https://lnkd.in/dBzSgcMf.   #battery #energystorage #marine #efficiency #powerelectornics #directcurrent #lvdc #solidstate #cleanenergy

⚓ If I Were a Shipyard Director, Here’s What I’d Invest in Right Now 2030 is not very far away. Given that a 100m+ superyacht takes several years to build, it makes sense that future regulations are part of today’s design brief.   From January 2030, under the FuelEU Maritime Regulation, vessels over 5,000 GT will need to plug into shore power (or use a zero-emission alternative) when moored for more than 2 hours in EU ports. Sounds simple enough, but it’s not. A recent review across 30+ major European ports found that only about 1 in 5 have the infrastructure ready or even contracted. So the rule is clear, but how we are going to get there – not so much. From my perspective, this means that ships will need to adapt faster than the ports can catch up. If I were sitting in a shipyard board meeting right now, here’s what I’d be putting money into 👇 1️⃣ Shore-power readiness (vessel side) Design/refit for OPS compatibility (interfaces, transformers, load management). Make “plug-and-play” the default to avoid compliance headaches and generator hours. 2️⃣ Demand reduction at berth Once moored, hotel load becomes the next problem. High efficiency chillers, insulation, smart controls, waste-heat recovery… Whatever it takes. As long as it reduces the HVAC fuel guzzle. 3️⃣ Power quality buffering Energy storage onboard can help manage spikes when switching between generators and grid power. It’s not just about compliance. It’s about efficiency and comfort. ESS should be treated as a design feature. 4️⃣ Fuel flexibility FuelEU’s 2030 goal also requires a 6% reduction in greenhouse gas intensity. That means giving new builds and refits the space, systems, and safety design to handle bio-methanol or hydrogen-based fuels later; even if they’re not installed yet. 5️⃣ Work WITH ports, not around them. Where you deliver and where your clients home-port matters. Prioritise yards and marinas planning credible OPS capacity and partner with them. Help shape their roadmaps because port readiness will drive vessel uptime. Compliance is binary. You either meet requirements or you don’t. But capability is cumulative. The smart shipyards will invest early, plug in cleanly, and keep their options open. 💬 If you were building or refitting today, what would your priority investment be? Shore power, fuel flexibility, efficiency upgrades? Something else? #MarineRecruitment #Superyacht #ShipyardsOfTheFuture

⚙️ Designing the Offshore 33 kV E-House — From FEED to Commissioning Behind every successful offshore oil & gas facility is an intelligently designed E-House — a self-contained electrical hub that powers production, safety, and reliability. In my latest presentation, I explored a complete design-to-commissioning roadmap for offshore 33 kV E-Houses — integrating MV/LV Switchgear, MCCs, UPS, HVAC, F&G systems, and lighting networks Here’s a snapshot of what the deep dive covers: 🔹 Structural Design: Blast-rated enclosure as per NORSOK & API, corrosion protection, vibration isolation. 🔹 Electrical Systems: 33 kV GIS per IEC 62271-203, earthing (API RP 14F), protection coordination, arc-flash & UPS redundancy studies. 🔹 HVAC Design: Pressurization, gas-tight ducting, fire dampers, and control integration with ESD / F&G. 🔹 F&G & Lighting: Zoning, cause & effect logic, emergency path illumination per NFPA 72 & API 14C. 🔹 Project Lifecycle: From FEED → Detailed Engineering → Fabrication → Commissioning → Handover, ensuring readiness and compliance. 💡 Key insight: “A successful E-House design is not about electrical drawings alone — it’s about system reliability, maintainability, and operational readiness.” If you’re working on offshore EPC or commissioning projects, this deep dive offers a holistic perspective — combining engineering, project management, and operational excellence into one workflow. #ElectricalEngineering #Offshore #EHouse #Commissioning #OilAndGas #ADNOC #Qatargas #CSU #FEED #PowerSystems #HVAC #Shell #ProjectManagement #Detailengineering #Electricaldesign