In recent years, Direct-to-Grid High-Voltage Energy Storage has emerged as a promising technical path in the energy storage industry. As a company committed to innovation in power electronics and energy storage, FGI continues to develop efficient, safe, and scalable solutions. This article explores the fundamentals, benefits, and development trends of this technology from an FGI perspective.
1. What Is Direct-to-Grid High-Voltage Energy Storage?
High-voltage direct-connect energy storage is a novel system architecture that connects the energy storage system directly to medium or high-voltage grids (e.g., 6kV, 10kV, or 35kV) through a cascaded topology of power modules—without the need for step-up transformers.
In contrast, traditional centralized or string-type systems connect battery clusters to a low-voltage DC bus, then convert it to low-voltage AC via PCS, and finally use a transformer to reach grid-level voltages. The direct-to-grid approach eliminates the transformer by connecting multiple modular units (each with a power converter and battery cluster) in series, achieving grid voltage levels through cascaded output.
2. Core Advantages of High-Voltage Direct-Connect Storage
A. Higher Efficiency and Reliability
Reduced energy losses: Eliminating the transformer avoids iron and copper losses, along with long-distance cable loss. Overall system efficiency may increase by 2% or more, depending on system design.
Improved power quality: Multilevel converter topologies ensure higher waveform quality and better grid adaptability. The system can provide rapid and precise reactive power support, enhancing transient voltage stability.
Enhanced system reliability: The architecture avoids the single-point-of-failure risk of centralized PCS designs, improving fault tolerance and resilience.
B. Greater Flexibility and Scalability
Battery-level adaptability: Fine-grained cluster-level control enables mixing different brands or capacities of battery packs within a single system.
Modular scalability: System voltage and power capacity can be adjusted by simply increasing or decreasing the number of series-connected modules.
3. Future Trends and Remaining Challenges
As storage projects scale up to hundreds of megawatts, low-voltage architectures face limitations—such as insufficient AC segmentation, DC arcing, and loop currents—jeopardizing both safety and efficiency. High-voltage direct-connect storage, with its streamlined architecture and superior performance, is increasingly regarded as a preferred solution for large-scale grid-side and renewable base storage applications.
However, the technology still faces challenges in system control, fault protection, and module-level stability. Nonetheless, driven by supportive policies, growing market demands, and technical advancements, its development is accelerating.
At FGI, we are actively exploring the practical implementation of direct-to-grid high-voltage storage systems, aiming to support a smarter, more resilient, and cleaner energy future.
Reach out to us for a free evaluation and tailored solution:
E-mail: overseas@fengguang.com
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