Grigoris Michos’ Post

We are pleased to share one of our recent works, which is now available early online in IEEE Transactions on Industry Applications. In multi-terminal DC grids, the multi-line DC power flow controller (MDCPFC) has emerged as a promising candidate to augment the control degrees of freedom for power flow regulation. Characterized by centralized internal power exchange, traditional MDCPFCs inevitably suffer from high stress across semiconductors and reduced regulation ranges. To address these challenges, we propose an interleaved modular multi-level MDCPFC (IM3DCPFC) and a novel decentralized power exchange mechanism in this paper. The proposed topology features high voltage scalability and an extended operation range. To fully unleash the power flow control capabilities of IM3DCPFC, an optimal power exchange scheme is developed via a closed-form solution, paving the way for complex power flow manipulations in real engineering. Meanwhile, a comprehensive steady-state analysis method is developed against IM3DCPFC, offering an accurate and highly efficient solution to the characterization of its steady-state performance. Enjoy reading the paper in IEEE Xplore.

I am happy share the community with our research work that was just accepted by IEEE Transactions on Industrial Electronics. Power regulation in hybrid ac/dc microgrids (MGs) is a critical concern, both in static and transient states. Static power regulation involves optimizing the dispatch of distributed energy resources (DERs) to meet the global load in proportion to their capacities, while transient power regulation requires each DER to manage load fluctuations based on their respective inertia during transients. However, the existing literature typically addresses these regulations separately focusing on static control often leads to the oversight of transient performance, and vice versa. To bridge this gap, we introduces a unified modeling framework that integrates both static and transient power regulation, providing a comprehensive, full time-scale control strategy for hybrid systems. This approach visualizes the power regulation process through a dynamic equivalent circuit model, where power flow is represented as current variables on respective circuit elements. Furthermore, distributed energy storage systems are deployed centrally forming a distributed storage (DS) subgrid so that DS can be uniformly managed and participate in full time-scale regulation within the hybrid ac/dc/DS MG. More technical details can be found in the following link. Enjoy reading.😀😀😀

In general, power design in NR is simpler than in 4G. In NR, a cell's power is shared across multiple channels, and the allocation of power to each channel plays a crucial role in determining the cell's coverage performance. This article discusses the key aspects of 5G DL Transmit Power Design, which should be considered when planning NR cell power. Great materials on actual power calculation (for those working in RAN optimization) are available at the link below. https://lnkd.in/dCmerQ3q Youtube video on the same Topic: https://lnkd.in/efCXgYfy #5G #3GPP #SSB https://lnkd.in/dumNA8DV

I would like to bring your attention to our new paper titled "Theory and Method of Distributed Virtual Zero-Sequence Synchronous Generators for Cooperative Fault Arc Suppression in Active Distribution Networks," published in the IEEE Transactions on Industrial Electronics. The paper is linked below, and here’s a brief summary: https://lnkd.in/gZZcRCHb Summary: Single-line ground (SLG) faults in distribution networks can cause hazards such as fire, electric shock, and overvoltage. Active power electronic converters (PECs) can suppress fault current and voltage; however, their application is limited due to low suppression rates and the high cost of additional equipment. This article proposes using distributed power electronics in active distribution networks to cooperatively eliminate faults. In this method, PECs are modeled as virtual zero-sequence synchronous generators (VZSGs), and line-to-ground impedances (LGIs) are modeled as zero-sequence loads. We propose a theory for distributed VZSGs supplying zero-sequence loads, which can effectively suppress fault current and voltage. The required supply current is adaptively allocated among VZSGs based on their reserve capacity ratio, and their supply current is dynamically adjusted according to the droop coefficients of VZSGs as LGIs change. This approach improves the fault current and voltage suppression rates by combining voltage- and current-based suppression methods. This new research relates to our previous works on fault suppression in active distribution networks, which I've also linked for your convenience. If you're working in this area or have an interest, I invite you to take a look at these papers. https://lnkd.in/gVCfTRb3 https://lnkd.in/gCUzeHUK https://lnkd.in/gGq_8GtT https://lnkd.in/g4gABcHa

⚡ How can we keep AC microgrids protected when fault currents change so drastically — from grid-connected to islanded operation, during outages, or during varying injections of distributed generators? I’m excited to share my recent publication (published back in May) in IEEE Transactions on Power Delivery, where we address this challenge with an adaptive protection strategy. Using a novel pickup scaling coefficient and a voltage varying threshold, our method ensures reliable relay coordination across diverse operating conditions with only the local measurements. It is validated through both simulations and real-time hardware experiments. This is the first AC microgrid protection strategy that can achieve a single optimal set of relay settings, which can maintain consistent CTIs among relay pairs, across such diverse scenarios, ensuring improved sensitivity, selectivity, and reliability. Special thanks to my Ph.D. supervisors, Prof. Abheejeet Mohapatra and Prof. S.N. Singh, as well as my friends and colleagues at the Indian Institute of Technology, Kanpur, for their continuous support. Please check out this link for the full paper 👉 https://lnkd.in/g4XVbbgC #powersystem #reserach #microgrid #protection #coordination #IEEE #IITK #thatsIITK

🔌 Power Quality Testing for Harmonics: Why It Matters In today’s power systems, nonlinear loads such as variable frequency drives, UPS systems, and even smart building technologies don’t just consume energy, they inject harmonic currents back into the network. These distortions, if left unchecked, can ripple through the grid, causing: ⚠️ Overheating of equipment ⚠️ Misoperation of protective devices ⚠️ Higher system losses ⚠️ Penalties for non-compliance with standards like IEEE 519 and the Philippine Distribution Code (PDC) That’s why power quality testing for harmonics is so important. It gives us visibility into Total Demand Distortion (TDD), helping us pinpoint where harmonic currents originate and how much they contribute to the overall distortion. The real focus? Correcting demand distortion at the load side. By addressing harmonic currents early through active harmonic filters, we ensure that voltage distortion across the grid remains within safe limits for everyone. ✅ Correcting demand distortion isn’t just a compliance measure, it’s a proactive step toward reliability, efficiency, and long-term sustainability. ⚡ Because when demand distortion is managed, the whole grid wins. #PowerQuality #Harmonics #ElectricalEngineering #Sustainability

✅ Hiii Connections! Day-13: What is an IR Drop? "In our life, there are things that slow us down ⏳; similarly, in circuits, there is something that prevents them from working properly or on time – this is known as IR Drop." 📖 Definition: IR drop refers to the voltage drop that occurs when current flows through the resistance in the power delivery network. V = I × R Where, ➡️ V = Voltage ➡️ I = Current ➡️ R = Resistance ⚠️ Impact: It causes less voltage to be delivered to cells than expected, due to which delay will increase, timing gets violated, noise increases, and performance degrades. There are two types of IR Drop: 1️⃣ Static IR Drop: ✔ It is caused when average current flows through the resistive paths of the power grid when the chip is in normal operation (where there is no clock). 2️⃣ Dynamic IR Drop: ✔ When a cell is switching at the active edge of the clock, the cell requires large current (or) voltage to turn “ON”, but due to voltage drop, sufficient amount of voltage is not reached to the particular cell, and the cell may go into metastable state, affecting timing and performance. 📢 Tomorrow I am going to share some information on interesting topics. Stay tuned! #VLSI #PhysicalDesign #IRDrop #PowerIntegrity #TimingAnalysis #ChipDesign #ASIC #DynamicIRDrop #StaticIRDrop #VLSIDesign #Semiconductors #EDA #PowerDeliveryNetwork

When industrial networks can’t fail, every millisecond matters. Kyland SICOM6800-D is a high-performance Layer 3 Backbone Switch designed for power, transportation, and critical infrastructure.  Learn more at 👉 https://lnkd.in/gVCyuzXX ✅ High availability with advanced redundancy (<20ms recovery)  ✅ Hardware based IEEE 1588v2 PTP ✅ Synchronization precision reaches 100 ns ✅ Secure management with 802.1X, ACL, RADIUS/TACACS+ ✅ Built for harsh environments (–40°C to +85°C, EMC Level 4, IP40) #IndustrialNetworking #SmartGrid #Transportation #Kyland #Energy #IndustrialEthernet #power

Excellent insights from the Telit Cinterion team. This article highlights key points about the future of private 5G and smart grids, emphasizing the importance of dedicated solutions like Band 106. Such solutions provide secure and reliable networks for smart grid applications, including solar panels and smart meters. Looking ahead, utilities will require these networks to modernize operations and protect against growing threats. While the private 5G market is exciting, it is currently dominated by major vendors, which creates a high barrier to entry for new players. #Utilities #IoT #PrivateNetworks #CriticalInfrastructure #Cybersecurity #Telit

💥 I’m happy to share that our review paper has been accepted in IEEE Microwave Magazine (Early Access): 💥 “High-Q Tunable Bandpass Filters With a Wide Tuning Range Using a Minimum Number of Tuning Elements.” What we cover: 📚 * A decade of progress in 3D tunable microwave bandpass filters * How to achieve wide tuning ranges while preserving high Q * Three stages of development: 1. tuning elements used only on resonators, 2. single tuning element for the whole filter, 3. techniques to expand tuning range while still using minimal elements Why it matters 🤔 : fewer tuning elements → simpler, lower-loss, and more reliable designs for satellite, wireless, and reconfigurable RF systems. Proud to collaborate with Professor Raafat R. Mansour and Professor Gowrish Basavarajappa. Check out the PDF here: https://lnkd.in/g_ytS4bZ