Ensuring Grid Stability with Renewable Energy Firming

I’m pleased to share that my latest research paper has been published in the IEEE Xplore Digital Library. Paper link: https://lnkd.in/d8nHQktB As power systems continue to evolve toward renewable-dominated architectures, maintaining stability under dynamic operating conditions becomes increasingly challenging especially in Solar–HVDC configurations. In this work, I explore the role of grid-forming Battery Energy Storage Systems (BESS) in addressing one of the critical issues: PV curtailment events and their impact on DC-link stability. The paper proposes an enhanced grid-forming control strategy that enables BESS to operate with voltage-source behavior, ensuring fast and reliable system response during abrupt solar power reductions. A detailed dynamic model was developed and validated in MATLAB/Simulink. Key findings: - BESS compensates a 40% PV curtailment within 100 ms - DC voltage deviations are limited to within ±2% - Achieves ~60% reduction in voltage transients compared to grid-following control These results highlight the importance of grid-forming BESS not just as a storage element, but as an active stabilizing component in future HVDC-based renewable grids. Looking forward to engaging discussions with colleagues working on grid-forming technologies, HVDC systems, and energy storage integration. #IEEE #HVDC #BESS #GridForming #PowerSystems #EnergyTransition #Renewables

🔴 The Spanish power system collapsed within seconds following a double contingency in its interconnection lines with France. First, a 400 kV line disconnected, and less than a second later, a second line also failed, suddenly isolating Spain while it was exporting 5 GW of power. The frequency rose abruptly, triggering the automatic disconnection of approximately 10 GW of renewable generation, programmed to shut down when exceeding 50.2 Hz. This led to a sudden energy shortfall, a sharp frequency drop, and within just nine seconds, a total system blackout. 🪕 The causes of the incident are attributed to low rotational inertia (only about 10 GW of synchronous generation online), identically configured renewable protections that reacted simultaneously, reserves that were inadequate for such a high share of renewables, and an under-dimensioned interconnection with France. Could this have been avoided? Several measures could help prevent similar situations in the future, such as requiring synthetic inertia in large power plants, reinforcing the interconnection with France, and establishing a fast frequency response market, among others. 💡 In this context, Battery Energy Storage Systems (BESS) are more essential than ever. These systems can provide synthetic inertia, ultra-fast frequency response, and backup power in critical situations—capabilities that today’s renewable-dominated system cannot ensure on its own. By reacting in milliseconds, BESS help stabilize the grid during sudden frequency deviations, preventing massive disconnections and buying time for other reserves to activate. Their strategic deployment, combined with appropriate regulation, would make these systems a cornerstone of a more secure and resilient future power system. ... ✋️Please note that this post was written based on the information published on or before its release. Root cause analysis is still ongoing and updates will be released with the outcomes of the investigation. The goal is to show the features that can be provided by BESS within the wide portfolio of solutions applicable in these cases. All inisghts are highly welcome and appreciated in order to enrich our collective understanding. ... 📸 Reid Gardner Battery Energy Storage System (Nevada, USA) A real-world example of how BESS ensures grid stability by delivering synthetic inertia and fast frequency response—essential in a renewable-heavy energy mix.

𝗪𝗵𝘆 𝗔𝘂𝘀𝘁𝗿𝗮𝗹𝗶𝗮 𝗶𝘀 𝘀𝗵𝗶𝗳𝘁𝗶𝗻𝗴 𝗳𝗿𝗼𝗺 𝘀𝘆𝗻𝗰𝗵𝗿𝗼𝗻𝗼𝘂𝘀 𝗰𝗼𝗻𝗱𝗲𝗻𝘀𝗲𝗿𝘀 𝘁𝗼 𝗴𝗿𝗶𝗱-𝗳𝗼𝗿𝗺𝗶𝗻𝗴 𝗯𝗮𝘁𝘁𝗲𝗿𝗶𝗲𝘀   On 30 September 2025, Transgrid announced a tender for about 1 GW of grid-forming battery (GFM BESS) system-strength services – the first step towards 5 GW.  The design is simple but transformative: 𝗰𝗮𝗽𝗮𝗯𝗶𝗹𝗶𝘁𝘆-𝗯𝗮𝘀𝗲𝗱 𝗽𝗮𝘆𝗺𝗲𝗻𝘁, 𝗲𝗻𝗲𝗿𝗴𝘆-𝗻𝗲𝘂𝘁𝗿𝗮𝗹 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻. Here’s why and how Australia is changing gears.   𝗪𝗵𝘆 𝘁𝗵𝗲 𝘀𝗵𝗶𝗳𝘁  - 𝗗𝗲𝗺𝗮𝗻𝗱 𝗿𝗲𝗱𝗲𝗳𝗶𝗻𝗲𝗱 – High-renewables grids now lack “system-forming strength + flexibility”, not more spinning steel.  - 𝗠𝘂𝗹𝘁𝗶-𝗿𝗼𝗹𝗲 𝗮𝘀𝘀𝗲𝘁𝘀 – GFM BESS delivers strength while earning from arbitrage, frequency regulation and congestion relief, cutting total cost.  - 𝗟𝗼𝗰𝗮𝗹𝗶𝘀𝗲𝗱 𝗿𝗲𝗶𝗻𝗳𝗼𝗿𝗰𝗲𝗺𝗲𝗻𝘁 – Placed at Renewable Energy Zone (REZ) and bottlenecks to lift connection capacity directly.  - 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝗲𝘃𝗼𝗹𝘂𝘁𝗶𝗼𝗻 – Firmware updates enable droop control, black-start and fault-ride-through to match new standards.   𝗞𝗲𝘆 𝗰𝗵𝗮𝗹𝗹𝗲𝗻𝗴𝗲𝘀  - 𝗙𝗮𝘂𝗹𝘁 𝗹𝗲𝘃𝗲𝗹𝘀 – GFM current limits demand adaptive protection coordination.  - 𝗖𝗼𝗺𝗽𝗹𝗶𝗮𝗻𝗰𝗲 – Model alignment, parameter tuning and hold-point testing across scenarios.  - 𝗠𝗲𝗮𝘀𝘂𝗿𝗲𝗺𝗲𝗻𝘁 & 𝗽𝗮𝘆𝗺𝗲𝗻𝘁 – Defining verifiable “system-strength capability” and enforceable performance terms.  - 𝗢𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝗮𝗹 𝗰𝗼𝗼𝗿𝗱𝗶𝗻𝗮𝘁𝗶𝗼𝗻 – Weak-grid voltage control and relay integration.  - 𝗦𝘂𝗽𝗽𝗹𝘆 𝗰𝗵𝗮𝗶𝗻 – Long-lead parts, EPC interfaces and controller updates.   𝗥𝗼𝗮𝗱𝗺𝗮𝗽  - 𝗦𝗵𝗼𝗿𝘁 (1–3 yrs) – Hybrid mix: renewables + condensers + GFM BESS. Condensers anchor VAR and faults; GFM builds stability.  - 𝗠𝗶𝗱 (3–7 yrs) – GFM-led fleet with condensers at critical nodes. Mature the “standard – testing – payment” loop.  - 𝗟𝗼𝗻𝗴 (>7 yrs) – GFM + digital protection replace most new condensers, keeping rotating back-up only where needed.   This is not about “opposing condensers” but “buying the right capability”. As the grid’s challenge shifts from “generating power” to “ensuring stability and usability”, assets must evolve from single-function to programmable multi-capability.   ✅ 𝗧𝗮𝗸𝗲𝗮𝘄𝗮𝘆  Australia’s system-strength strategy is entering a phase where GFM BESS complement synchronous machines – with payments finally reflecting true grid value.    🤔 𝗤𝘂𝗲𝘀𝘁𝗶𝗼𝗻  Which barrier is most critical for large-scale GFM BESS rollout – testing, fault-levels, or performance verification?   #TechToValue #GridForming #BESS

For most of the last century, generators stabilised the grid as a by-product of producing energy. Today, we are building assets that stabilise the grid without producing energy at all. That shift identifies the binding constraint. Electricity system transition is no longer constrained by renewable resource availability. It is constrained by deliverability and operability. In inverter-dominated systems under rapid load growth, the binding constraints are: - transmission and major substation capacity - system strength, fault levels, frequency and voltage control - connection and commissioning throughput - secure operation under worst-day conditions - execution pace across networks and system services Generation capacity remains necessary. On its own, it no longer delivers firm supply or supports large new loads. Historically, synchronous generators supplied energy and stability together. Inertia, fault current, voltage support, and controllability were implicit. As synchronous plant retires, these services must be provided explicitly. Stability shifts from physics-led to control-led. System behaviour becomes more sensitive to modelling accuracy, protection coordination, control settings, and real-time visibility. Curtailment is not excess energy. It is a deliverability or security constraint. When transmission and substations lag generation, congestion and curtailment rise. Independent analysis shows that delay increases prices and emissions by extending reliance on higher-cost thermal generation. Distribution networks are no longer passive. They now host distributed generation, storage, EV charging, and large loads at the edge of transmission. Voltage control, protection coordination, hosting capacity, and connection throughput now constrain both decarbonisation and industrial growth. Firming is a hard requirement. Batteries provide fast frequency response and contingency arrest. They do not provide multi-day energy and do not replace networks or system strength in weak grids. Demand response reduces peaks. It cannot be relied upon for system-wide security under stress. Execution speed is critical. Slow delivery increases congestion duration, curtailment exposure, reserve requirements, and reliance on ageing plant. These effects flow directly into costs, emissions, and reliability. This is why electricity bills can rise even when average wholesale prices fall. Costs are driven by peak demand, contingencies, and security, not average energy. Large digital and industrial loads are transmission-scale, continuous, and failure-intolerant. They increase contingency size and correlation risk. At that scale, loads do not connect to the grid, they shape it. Supporting growth requires time-to-power, transmission and substation capacity in load corridors, explicit system strength and fault levels, operable firming under worst-day conditions, scalable connection and commissioning, and early procurement of long lead time HV equipment. #energy

Grid-Forming Inverters: Quietly Solving a Crisis We Don’t Talk About As renewables scale, one thing is quietly disappearing from our grids: Inertia. Spinning turbines in coal, gas, and hydro plants used to stabilize frequency. But inverter-based solar and storage don’t provide that naturally. Enter Grid-Forming Inverters (GFIs), not just feeding power, but actively supporting the grid. ✅ Create voltage and frequency reference — no need to follow others ✅ Provide virtual inertia for smoother post-fault recovery ✅ Enable black start capability (restart a dead grid) ✅ Stabilize weak grids — vital for remote and developing regions In short: they help solar + BESS act like conventional generation and that changes everything. 📊 A few numbers to keep in mind: • Australia targets 80% of new inverters to be grid-forming by 2035 • Systems with over 60% inverter-based generation become unstable without GFIs • IRENA notes that with >60% inverter-based generation, systems without GFIs face serious stability risks 🔍 Curious how others are integrating GFIs into their systems? Let’s exchange notes — strategy, challenges, and lessons learned. #GridStability #RenewableEnergyTech #SolarAndStorage #PowerSystemsInnovation

In the wake of Europe’s worst blackout, Spain has adopted a temporary solution to address the energy security challenges during "hellbrise" at midday. These are periods with the highest solar and wind generation combined. Spain’s grid operator, Red Eléctrica (REE), has transitioned the national grid into a "strengthened mode" of operation. Essentially, this involves partially suspending normal electricity market operations by compensating renewable generators (solar and wind) to curtail output at peak times, making space for more synchronous generation from hydro, nuclear, and gas plants. These conventional plants provide essential stability services. Their large spinning turbines offer critical system inertia, absorbing shocks and smoothing power fluctuations, thus creating a robust buffer against disturbances. Furthermore, synchronous generators significantly enhance frequency regulation and voltage support, while also boosting system strength through short-circuit capacity and power system stabilizers (PSSs). Spain’s post-blackout strategy represents a clear departure from typical operations, emphasizing a conservative, reliability-focused approach. At a Senate hearing on May 6, Spain’s Energy Minister Sara Aagesen Muñoz stated, “The electrical system is now operating under reinforced conditions regarding operational security," explicitly referencing measures introduced after the April 28 incident. She also highlighted REE’s independent technical authority in taking necessary actions to "guarantee security of supply." In practice, wind and solar generation are now being modestly curtailed, depending on daily renewable forecasts, until the grid infrastructure and control systems can reliably accommodate higher instantaneous renewable penetration levels. The current "strengthened mode" is intended as a short-term emergency measure. Government and REE officials have clarified that this strategy will remain only until the precise causes of the blackout are fully understood and appropriate upgrades are implemented. Historically, Spain has been a pioneer in renewable energy integration, regularly setting records in wind and solar production, making this temporary shift especially notable. For now, however, maintaining grid stability and ensuring reliability clearly takes priority: more spinning turbines, less immediate reliance on solar and wind, until operators are confident the grid can handle operating at a smaller stability margin safely.

Grid-Forming vs Grid-Following Inverters; Why the Difference Matters ⚡ As renewable penetration increases, inverter technology is rapidly evolving. Power systems are shifting from grid-following (GFL) to grid-forming (GFM) architectures, fundamentally changing how electricity networks operate. 🔹 Grid-Following Inverter (GFL) 🔸 Depends on an existing grid voltage & frequency 🔸 Uses a Phase-Locked Loop (PLL) to synchronize 🔸 Injects current by following the grid waveform 🔸 Requires a strong grid reference 🔸 Cannot operate independently during grid outages 🔸 Commonly used in traditional PV plants 🔹 Grid-Forming Inverter (GFM) 🔸 Actively establishes voltage & frequency reference 🔸 Operates like a virtual synchronous generator 🔸 Works in islanded & weak-grid conditions 🔸 Provides virtual inertia & fast frequency response 🔸 Enhances grid stability and fault ride-through 🔸 Essential for microgrids, BESS & future renewable grids 📊 In simple terms 🔹 Grid-Following → Follows the grid 🔹 Grid-Forming → Creates the grid 🌍 Why this matters As we move toward high-renewable and 100% inverter-based grids, Grid-forming technology will be critical for: 🔸 System stability 🔸 Resilience during outages 🔸 Reliable operation of microgrids 🔸 Large-scale Battery Energy Storage Systems (BESS) 👉Do you see grid-forming inverters becoming mandatory in future grid codes? #GridForming #GridFollowing #InverterTechnology #PowerSystems #BESS #Microgrids #RenewableEnergy #SolarEngineering #EnergyTransition

🔋 The 1,000 MW/6,000 MWh electrochemical energy storage project in Inner Mongolia commenced construction in June 2025. This project is one of the largest power-side electrochemical energy storage projects worldwide, using advanced lithium iron phosphate technology and integrating power conversion, boosting systems, and an energy management system. It is designed for multiple functions, including independent participation in grid frequency regulation, peak shaving, electricity market transactions, and capacity compensation. This solution is expected to provide an annual peak shaving capacity of 2.16 billion kWh, significantly reducing wind and solar curtailment, enhancing grid stability, and helping Inner Mongolia reach over 50% new energy installed capacity by 2025. The project highlights the global need for such solutions, with US$1.2 trillion in BESS investments needed to support over 5,900 GW of new wind and solar capacity by 2034. The worldwide BESS capacity is projected to triple by 2035.    🔦 A crucial part of this evolution is the Grid-Forming (GFM) control, which is proving vital for integrating increasing renewable energy capacities and strengthening grid stability. Unlike traditional grid-following (GFL) systems that merely respond to grid conditions, GFM BESS can actively establish and maintain grid stability, bridging the gap between abundant renewable energy and strict grid requirements. This ability is essential, especially in regions like Asia-Pacific, where variable renewable energy can constitute between 46% and 92% of peak demand. As shown in the figure, GFM BESS provides key functionalities, including independent voltage source capabilities, support for high current transients during disturbances, inertia response similar to conventional power plants, and black start functions for full system recovery after outages. Although GFM features add an estimated 15% to overall system costs, mainly due to upgraded inverters, controls, and software, this is increasingly manageable as battery prices continue to fall. #battery #energystorage #gridmodernization #efficiency #powerelectronics #cleanenergy

Australia’s Grid Just Ordered 10 Spinning Machines, and They’ll Pay for Themselves in a Year New South Wales is adding 10 synchronous condensers, two at each of five sites, delivered two years ahead of schedule. Each unit adds real inertia and fault current, stabilizing a grid where coal exits faster than inverters can replicate its physics. Hidden Constraint: Australia’s east-coast grid now runs with the lowest inertia on AEMO’s published record (2008-present). Synthetic inertia helps, but only once inverters see the event. What’s Changing: Transgrid will pair these syncons with grid-forming batteries, creating a dual stability backbone, rotating mass and virtual mass side by side. Key metrics: • $1 billion estimated market benefit • Equivalent to one-year payback • Shaved 24 months off original delivery • NEM-wide inertia has fallen from ~105 GW·s (2011) to ~93 GW·s (2023), its lowest level in the dataset (Reactive Technologies and University of Melbourne, 2024). Why It Matters: • Physical inertia still carries trust that algorithms haven’t earned. • Yet the future is hybrid, when electrons from batteries and megajoules from spinning rotors share the same mission: hold the grid in phase. 👉 Take-away: the stability frontier isn’t “rotating vs. synthetic.” It’s learning to choreograph both. #GridStability #EnergyTransition #PowerSystems #Inertia #Renewables #GridForming #SynchronousCondenser #Australia #SolarPV

Meanwhile in Europe… a new mandate requires grid-forming capability for all new storage systems over 1 MW... How is this relevant in the U.S.? Because similar challenges exist here (though somewhat different), and I keep hearing grid-forming technology mentioned in discussions. As synchronous generators retire and renewables grow, system inertia needs to be maintained. Grid-forming inverters aren’t just a technical upgrade, they can: - Establish voltage and frequency without relying on a strong grid. - Provide synthetic inertia and fast frequency response. - Enable black start capability for resilience. As you can see, Europe’s ENTSO-E Transmission System Map shows an interconnected grid that needs these capabilities to stay stable. Our grid is no different, especially in regions like CAISO, ERCOT, and MISO. For developers and generators, this could mean planning ahead to avoid costly retrofits if similar standards emerge in the U.S. For operators and utilities, it’s about maintaining stability and managing high renewable penetration without relying on expensive synchronous condensers. So, what’s happening here in the U.S.? NERC and DOE are already studying grid-forming tech, and early adopters will lead in reliability and compliance. 🤔 I want to know more: What grid-forming requirements may arise? And are we starting discussions about this technology?