Grid-forming hybrid energy storage supports high-penetration renewable energy scenarios.

Scene Name

Grid-forming hybrid energy storage ensures the safe integration and consumption of high-proportion renewable energy in the power grid.

Core Technology

Multi-type energy storage coupling technology: By efficiently combining lithium iron phosphate batteries with all-vanadium redox flow batteries, the system achieves complementary functionality—balancing power response with long-term energy storage—to meet the diverse needs of the power grid.

High-Level Grid-Formation Control Technology: Based on the Virtual Synchronous Generator (VSG) and grid-forming PCS (energy storage converters), the system provides proactive support capabilities such as inertia support for energy storage, primary frequency and voltage regulation, and rapid black-start functionality.

Extreme Environment Adaptation Technology: By adopting a wide-temperature-range electrolyte formulation and a weather-resistant enclosure design, combined with an intelligent thermal management system, the equipment ensures stable operation even under challenging conditions such as high and low temperatures, as well as dusty environments.

Application Description

This scenario focuses on the grid stability challenges faced in regions with high proportions of wind, solar, and other renewable energy sources integrated into the grid. To address these issues, large-scale hybrid energy storage power stations are being deployed in resource-rich areas such as Inner Mongolia and Qinghai. Among them, lithium iron phosphate battery modules deliver millisecond-level response speeds, enabling the grid to swiftly execute high-frequency commands like frequency regulation and AGC adjustments, effectively smoothing out fluctuations in wind and solar power generation. Meanwhile, all-vanadium redox flow battery modules, leveraging their exceptional long-cycle life, take on the critical tasks of long-duration peak-shaving and backup operations lasting more than 4 hours. By employing advanced grid-forming algorithms, the system actively participates in grid regulation, allowing photovoltaic plants in extremely weak-grid areas like Gaize, Tibet, to boost their output capacity from 1.5 MW to as high as 12 MW. In regions like the Western Mongolia Grid, where renewables already account for over 35% of the energy mix, this innovative solution effectively mitigates voltage fluctuations and frequency instability issues. Additionally, thanks to black-start technology, the power station can recover load within minutes, ensuring uninterrupted power supply continuity.

Technological Advancement

· Breaking through the limitations of single energy storage technology, the hybrid storage model achieves full coverage of both "power-type" and "energy-type" functionalities, effectively addressing the grid's dual demands for response speed and storage duration.

· The grid-forming capability has reached an internationally leading level, having undergone more than 2,300 complex operational tests. Its robust support in scenarios such as weak-grid and off-grid conditions has been rigorously validated through large-scale, real-world demonstrations.

· Achieving breakthroughs in extreme environmental adaptability, it can operate stably in temperatures as low as -35.5°C, at high altitudes of 4,700 meters, and in dusty, sandy environments—expanding the boundaries of energy storage applications.

Practical Application Value

· Significantly enhancing the ability to integrate new energy sources, reducing wind and solar power curtailment losses, and supporting the realization of the "Dual Carbon" goals—such as the Philippines' solar-plus-storage project, which achieved 13 hours of stable 850MW power generation, serving 2.4 million households.

· Reduce reliance on conventional thermal power, decrease the frequency of unit start-ups and shutdowns, as well as pollutant emissions, and enhance the operational efficiency of the power system.

· By building a diversified revenue model through a combined approach of "fixed compensation + market trading + ancillary services," the investment payback period is significantly shortened—Sweden's frequency-regulation energy storage plant achieves a payback period of just 1 year.