Smart Grid Solutions

🔋 Typically, the grid-connected inverters are split into two types: Grid-Following (GFL) inverters and Grid-Forming (GFM) inverters. GFL inverters are conventionally controlled as current sources, relying on a Phase-Locked Loop (PLL) to achieve synchronisation to the external grid voltage. This configuration means GFL inherently lacks both voltage-forming (VFM) and frequency-supporting capabilities. Conversely, GFM inverters operate as voltage sources, achieving self-synchronisation through their active power output, and can form both grid frequency and voltage. A recently investigated extension of GFM control, the Frequency-Following Voltage-Forming (FFL-VFM) inverter, strategically decouples these capabilities. The FFL-VFM inverter forms the voltage but sacrifices frequency support, instead enabling the inverter to stably and quickly follow outer grid frequency variations (FFL) while enhancing grid voltage stiffness (VFM). This structure achieves a faster frequency response than conventional GFM and still supports the voltage control in the grid. 🔦 The FFL-VFM controller is based on GFM matching control, with a virtual amortisseur (red R) and virtual pole-pair number (red N) managing grid synchronisation and dc-link voltage regulation. The structure, integrated with the dc-link capacitor, achieves stable and quick responses to grid frequency changes. The synchronisation loop uses fast PI control, rather than the slower Low-Pass Filter (LPF) in GFM. This control damps the slip frequency between the inverter and grid via the power-angle relationship, ensuring the inverter tracks the grid frequency until synchronisation. 💡 VFM capability appears in the inverter's port admittance. Near the fundamental frequency, FFL-VFM's port admittance is 10x that of GFL. High FFL-VFM admittance lets it provide voltage support, unlike GFL inverters. #gridforming #battery #energystorage #gridmodernization #powerelectronics #renewables #cleanenergy

Grid-Forming Inverters: A Comparative Study of Different Control Strategies ----------------------------------------------------------------------------------- As grid-forming inverters (GFMIs) are anticipated to play a leading role in future power systems, comprehensive understanding of their dynamics and control strategies becomes essential. Our recent article delves deep into this, offering a comparative study including: 1)      Detailing the control structures and tuning of four different control strategies for GFMIs (Droop, VSG, Compensated Generalized VSG, and Adaptive VSG). 2)      Conducting extensive frequency domain analysis employing impedance-based stability analysis, exploring various scenarios (SCR variations, Xg/Rg variations, operating point variations, dynamics of virtual impedance, and dynamics of inner current and voltage loops). 3)      Validating the frequency domain analysis through EMT simulations. 4)      Testing against external grid disturbances (frequency deviations, phase shifts, and voltage sags) in both strong and weak grid connections.   For more information: Article Title: Grid-Forming Inverters: A Comparative Study of Different Control Strategies in Frequency and Time Domains. Authors: Nabil Mohammed, Harith Udawatte, Weihua Zhou, Professor David Hill, Behrooz Bahrani. Journal: IEEE Open Journal of the Industrial Electronics Society. Links [Open Access]: https://lnkd.in/gE_fgJ6F ; https://lnkd.in/gMz-S4KE .   Special thanks to the Australian Renewable Energy Agency (ARENA) and the Australian Research Council for funding this work.   #powerelectronics #forminginverters #renewableenergy #gridintegration #sustainability #energytransition

If you are an early-stage researcher who wants to dive into the grid-forming (#GFM) inverter world, we have created a step-by-step tutorial based on #UNIFI’s GFM reference design— as part of UNIFI’s educational initiative. ⚙️Written in easy-to-follow language, this tutorial walks you through: ✅ The control architecture of GFM inverters ✅ How to pick control gains for outer voltage and inner current loops ✅ LCL filter design basics ✅ How current limiters work and why they matter ⚙️This tutorial also comes with hands-on guidance for navigating UNIFI’s open-source GitHub repository, which contains everything you need to build your first GFM inverter: ✅ Simulation models (both average and EMT models) ✅ PCB design files ✅ Embedded control code for running hardware ✅ Detailed documentation for single-phase and three-phase GFM hardware—covering all the bits and pieces: component selection, thermal considerations, sensing-circuit design, and more! Starting from scratch, building a working GFM inverter setup can take years. With this tutorial and the resources in UNIFI’s repository, you can skip most of the setup headaches—saving 1–2 years of work! 🔗If you’re ready to get started, check out the tutorial and explore the repository—links in the first comment. Rahul Mallik Weiqian Cai Kamakshi Tatkare Jakob Triemstra Cuauhtemoc Macias

Grid-forming control to achieve a 100% power electronics interfaced power transmission systems by Taoufik Qoria -”Nouvelles lois de contrˆole pour former des r´eseaux de transport avec 100% d’´electronique de puissance” ´ECOLE DOCTORALE SCIENCES ET M´ETIERS DE L’ING´ENIEUR L2EP - Campus de Lille  Abstract: The rapid development of intermittent renewable generation and HVDC links yields an important increase of the penetration rate of power electronic converters in the transmission systems. Today, power converters have the main function of injecting power into the main grid, while relying on synchronous machines that guaranty all system needs. This operation mode of power converters is called "Grid-following". Grid-following converters have several limitations: their inability to operate in a standalone mode, their stability issues under weak-grids and faulty conditions and their negative side effect on the system inertia.To meet these challenges, the grid-forming control is a good solution to respond to the system needs and allow a stable and safe operation of power system with high penetration rate of power electronic converters, up to a 100%. Firstly, three grid-forming control strategies are proposed to guarantee four main features: voltage control, power control, inertia emulation and frequency support. The system dynamics and robustness based on each control have been analyzed and discussed. Then, depending on the converter topology, the connection with the AC grid may require additional filters and control loops. In this thesis, two converter topologies have been considered (2-Level VSC and VSC-MMC) and the implementation associated with each one has been discussed. Finally, the questions of the grid-forming converters protection against overcurrent and their post-fault synchronization have been investigated, and then a hybrid current limitation and resynchronization algorithms have been proposed to enhance the transient stability of the system. At the end, an experimental test bench has been developed to confirm the theoretical approach.  VIEW FULL THESIS: https://lnkd.in/dcTJU-9v

🔋 Powering the Future: Grid-Forming Inverters for Stable Renewable Integration 🌍⚡ As the energy landscape rapidly evolves with increasing contributions from renewable sources like solar and wind, maintaining grid stability has become more challenging. Enter Grid-Forming Inverters—the game-changers in modern power systems. A grid-forming inverter is a power electronic device that plays a crucial role in the operation and stability of electrical power grids What Makes Grid-Forming Inverters Essential? Unlike traditional grid-following inverters that merely follow grid voltage and frequency, Grid-Forming Inverters actively control voltage and frequency, making them vital in microgrids and regions with unreliable access to main power grids. They continuously monitor grid conditions and adjust their output to maintain stability and synchronization, addressing the lack of rotational inertia in inverter-based resources. 💡 Key Control Techniques in Grid-Forming Inverters: 📍 Voltage and Frequency Droop Control: Regulates voltage and frequency in multi-generating setups, ensuring smooth operation. 📍 Virtual Inertia & Frequency Support: Mimics traditional rotating masses by controlling the rate of change of output power, enhancing grid stability. 📍 Phase-Locked Loop (PLL): Ensures precise synchronization by accurately detecting grid frequency and phase. 📍 Fault Ride-Through: Keeps inverters connected during grid faults, ensuring uninterrupted power and system reliability. 📌 Why It Matters: Grid-forming inverters are not just about integrating renewables; they are about redefining grid reliability and stability. By actively managing power quality and ensuring synchronization, they play a critical role in the clean energy transition. 📈 Why Now? With 94% of new U.S. electric-generating capacity in 2024 expected to come from inverter-based resources like solar and wind, the shift to grid-forming technology is not just beneficial—it's essential for a sustainable energy future. 📖 Reference: For a comprehensive dive into the critical role of grid-forming inverters, check out the Introduction to Grid Forming Inverters by Ben Kroposki, Director at the Power Systems Engineering Center, National Renewable Energy Laboratory (NREL). This document outlines why GFM inverters are vital in today's evolving energy landscape. #GridFormingInverters #RenewableEnergy #PowerGridStability #InverterTechnology #EnergyTransition

Grid-Forming PV Integration for Enhanced Grid Stability ------------------------------------------------------------- As renewable penetration increases, maintaining grid stability without relying on synchronous generators has become a critical challenge. To address this, I designed and validated a grid-forming inverter system directly integrated with a photovoltaic (PV) source, controlled using droop control, and implemented in MATLAB Simulink. Unlike conventional grid-following PV systems, this architecture allows the PV inverter to form and regulate the grid actively, enabling stable operation even in weak or low-inertia grids. System Architecture & Key Design Parameters - Photovoltaic Source (DC Side) - PV Maximum Power (Pmp): 10.675 kW - PV Voltage at MPP (Vmp): 290 V - PV Current at MPP (Imp): 36.75 A The PV array is interfaced with a DC-link and grid-forming inverter, enabling seamless power conversion while maintaining dynamic control over voltage and frequency. - Grid-Forming Inverter (AC Side) - Injected Active Power: ≈ 10 kW - Grid Voltage: 400 V RMS - Nominal Grid Frequency: 50 Hz This setup reflects a realistic grid-connected PV scenario, where the inverter must operate under off-nominal frequency and voltage conditions while ensuring grid support. Why Grid-Forming Droop Control? By embedding droop control into the PV inverter, the system mimics the behavior of conventional synchronous generators, allowing the PV system to become an active grid asset rather than a passive energy source. ✔ Frequency Support: Active power modulation in response to frequency deviations ✔ Voltage Regulation: Reactive power sharing for voltage stability ✔ Black-Start Capability: Grid formation without an external voltage reference ✔ Scalability: Stable parallel operation of multiple PV inverters without communication - Effective Voltage Control: Reactive power droop ensured stable voltage profiles, even during transient conditions. - High Grid Resilience: The system maintained synchronism and stability during disturbances, demonstrating strong suitability for weak and low-inertia grids. Key Insights & Impact The simulation confirms that PV-based grid-forming inverters can: - Replace traditional synchronous generation roles - Enable higher renewable penetration without compromising stability - Support future power systems dominated by inverter-based resources This work demonstrates how PV systems can evolve from grid-following to grid-forming, transforming renewables into stability-providing elements of modern power systems. Feel free to reach out if you’d like to collaborate on similar projects.  #MATLAB #SIMULINK #GridForming #PVIntegration #DroopControl #PowerElectronics #RenewableEnergy #InverterBasedResources #SmartGrids

Following the wide recognition of Grid-Forming (GFM) inverters as a cornerstone for grid stability, the focus of innovation is rapidly shifting from “forming” the grid to actively orchestrating it. The next frontier blends intelligence, adaptability, and cross-domain interaction — pushing power systems into what experts now call the Grid 3.0 era. Here’s where research and advanced practice are heading : ① Multi-Mode & Hybrid-Compatible Inverters (HC-GFIs) Next-gen converters can seamlessly operate in GFM or GFL modes depending on system strength — enhancing flexibility and resilience under changing conditions (Nature Scientific Reports, 2025; ArXiv Energy Systems, 2024). ② Unified AC/DC & Dual-Port Architectures Dual-port inverters are enabling hybrid microgrids, dynamically balancing AC and DC power flows to integrate solar, storage, and EV systems with unprecedented efficiency. ③ Wide-Area Damping via PMU-Driven Control Using synchronized phasor measurements and edge computing, wide-area damping control (WADC) coordinates multiple GFMs, HVDC links, and FACTS devices — achieving real-time system stabilization even in weak grids. ④ Digital, Predictive & AI-Assisted Operations AI-enabled predictive control is now being used to anticipate voltage instabilities, optimize inertia emulation, and coordinate fleets of distributed GFMs (NREL Digital Twin Grid Initiative, 2024). ⑤ Virtual Power Plants (VPPs) & Hydrogen-Linked Storage Thousands of GFMs, EVs, and hydrogen fuel systems are being aggregated into Virtual Power Plants capable of grid support, black-start, and ancillary services at national scale. ▪️In essence: we’re evolving from grid-forming to grid-intelligent systems — adaptive, self-healing, and data-driven. The future grid will not only be stable; it will be strategically aware. #GridForming #GridIntelligence #PowerSystems #BESS #HybridGrids #AIinEnergy #VPP #EnergyTransition #IEEE_PES

⚖️🔧⚡ Transitioning from Grid-Following (GFL) to Grid-Forming (GFM) in Solar + BESS Projects As more renewable projects move toward grid-forming capabilities, it’s critical to understand that success depends on two distinct but equally important layers: 👉 Power Electronics (device level) 👉 GPM – Grid Performance Management (plant/system level) They solve different parts of the problem — and both must evolve together. 🔌 1. Power Electronics – The Foundation Before (GFL): -Inverters follow grid voltage & frequency (PLL-based) -Require a strong grid -Limited stability support (no inertia, -weak voltage control) After (GFM): -Inverters create voltage & frequency -Act like synchronous machines (virtual inertia, droop control) -Operate in weak grids or islanded mode 🔧 Key Changes: Control shift: PLL → Droop / Virtual Synchronous Machine (VSM) Add: Frequency droop (P–f) Voltage droop (Q–V) Synthetic inertia OEM firmware & protection updates (e.g., Sungrow, Tesla, SMA) Integration of BESS for fast dynamic support Enhanced fault response & ride-through capability 🧠 2. GPM – The System-Level Brain GPM coordinates the entire plant: Inverters BESS Plant Power Controller (PPC) Interfaces with utilities (e.g., Oncor) and ISOs (e.g., ERCOT) 🔧 What Changes with GFM: ✔ PPC Upgrades Grid-forming dispatch Multi-unit coordination Voltage & frequency reference control Black start capability ✔ EMS Enhancements BESS dispatch optimization SOC management (maintain headroom for grid support) ✔ Grid Compliance Meet requirements like NOGRR272 Fast frequency response Voltage ride-through Disturbance support ✔ Protection Updates Adaptive protection schemes Revised relay coordination Anti-islanding updates ✔ Operational Modes Grid-connected ↔ Grid-forming Grid-forming ↔ Islanded Black start sequences ⚖️ Power Electronics vs GPM – Key Difference Power Electronics: Creates voltage & frequency (device-level stability) GPM: Coordinates and sustains plant-wide performance ⚡ Real Example: 40 MW Solar + 10 MW / 20 MWh BESS Without GFM: PV becomes unstable in weak grids No meaningful frequency support With GFM: BESS + inverter form the grid Stabilize voltage & frequency GPM ensures: SOC ~50–70% (bidirectional support) Dynamic dispatch Alignment with ERCOT signals 🚧 Key Risks if Not Done Right Control instability (oscillations) BESS depletion → loss of support Protection miscoordination Non-compliance (e.g., NOGRR272) Interconnection delays ✅ Bottom Line ⚡ Power Electronics = “Can we form the grid?” 🧠 GPM = “Can we control it reliably at scale?” 👉 You need both: Power electronics enables the capability GPM ensures it works in real-world grid conditions #SolarEnergy #RenewableEnergy #EnergyStorage #BESS #GridForming #GridFollowing #PowerElectronics #EnergyTransition #ERCOT #GridStability #CleanEnergy #Inverters #Engineering #PowerSystems #EnergyManagement #UtilityScale #SolarProjects #Transmission #Infrastructure

Grid Forming vs Grid Following, Why This Matters for Modern Solar Plants Most solar inverters today are grid following, they wait for the grid and simply synchronize to its voltage and frequency. But as we move toward high penetration renewables, grid forming capability is becoming a game changer. ⚡ Grid Following (GFL) Follows the grid → Cannot operate without it. It’s like a dancer following the beat, when the music (grid) stops, the dancer stops. ⚡ Grid-Forming (GFM) Creates the grid → Sets the voltage and frequency itself. It’s the drummer that makes the beat, even if nothing else is running. Key Difference (Simple Engineering View): GFL: Needs a strong grid to operate GFM: Can operate in weak or unstable grids GFM: Can run islanded, provide synthetic inertia, and even black-start a microgrid Why this matters: Regions with unstable or weak grids (remote areas, developing nations, mining operations, microgrids) benefit massively. Instead of tripping off during disturbances, a grid forming inverter actively stabilizes the system. Example: Sungrow SG4800UD Series Modern utility-scale inverters now support: PV grid forming mode Strong/weak grid self adaptation Ultra fast reactive power support (≈20 ms) Off grid commissioning / black start capability This allows solar + storage plants to support the grid rather than depend on it. One line takeaway: Grid following waits for the grid. Grid forming creates the grid. A fundamental shift, and it’s already happening. ⸻ #️⃣ #Sungrow #SG4800UD #GridForming #SolarEngineering #PowerSystems #Renewables #ElectricalEngineering #SolarPV #UtilityScaleSolar #Microgrid #EnergyStorage #Inverters #CleanEnergy #GridStability #WeakGridSolutions

⚡ Grid-Forming Batteries = The Inverter That Sets the Rules 🔋 Traditional grid inverters follow the grid's signal. Grid-forming batteries create it. That distinction is becoming one of the most important in energy storage. 🔌 Grid-Following = Inverters wait for instructions, matching existing voltage and frequency. This works when spinning turbines are holding the grid stable. But as renewables replace those turbines: • Less synchronous generation • Less inertia • Frequency deviations happen faster than grid-following assets can react → The reference signal weakens. The grid becomes more fragile. Spain's April 2025 blackout was a live demonstration… Voltage control failed, partly because regulations prevented inverters from providing it. ⚙️ Grid-Forming = Inverters generate the reference themselves The inverter sets its own voltage and frequency, even in weak or unstable conditions. This enables: • Synthetic inertia → millisecond response, no rotating parts • Black start → restart a grid from zero • System strength → support weak transmission areas • Islanded operation → run without a grid connection 🌍 Deployment is already happening: • Europe: ENTSO-E is moving to mandate grid-forming for all new storage >1 MW • UK: £323M Stability Pathfinder programme piloting grid-forming stability services • Australia: Leading at scale with 5 grid-forming BESS projects, including the 1 GWh Western Downs Battery 📈 With Wood Mackenzie estimating ~1,500 GW of new BESS by 2034, the future needs these batteries to lead, not just follow. #EnergyStorage #BESS #GridForming #GridStability #Renewables #EnergyTransition