Grid-Forming Storage Boosts Yunnan Green Energy | Guangte Electrical Aids Qiubei Project Full Grid Connection

The "Energy Internet +" project adopts containerized energy storage, with different systems arranged in separate container compartments, and the entire system is set up within the park. It ensures the continuous and stable operation of high-precision equipment, unaffected by sudden power outages. It intelligently manages household electricity loads, delivers high-quality output power, and exhibits strong grid compatibility.

The entire station integrates self-developed high-performance PCS, BMS, EMS, and battery PACK, continuously iterating and innovating in terms of safety performance, application environment, technical parameters, and installation convenience. It has become a household smart energy storage system with the most comprehensive power range and leading overall performance on the market. It is equipped with temperature and humidity control systems, insulation systems, flame-retardant systems, fire alarm systems, lightning protection systems, electrical interlocking systems, mechanical interlocking systems, escape systems, emergency systems, firefighting systems, and other automatic control and safeguard systems to ensure a stable working environment for lead-acid and lithium batteries, enabling remote monitoring.

The cabin manufacturing and the installation and commissioning of the main equipment are basically completed in the factory. The cabin and equipment are integrated, allowing operation within 15 to 20 days after arrival on-site. The prefabricated outdoor all-in-one energy storage system offers advantages such as large capacity, high flexibility, strong reliability, excellent scalability, easy installation and unloading, and strong environmental adaptability. It saves labor costs in equipment production, installation, and commissioning. As a result, the construction period is relatively short, the footprint is small, transportation is convenient, and installation is relatively easy.

1. Grid-connected constant power charge/discharge control, constant voltage current-limiting charging. Off-grid V/F control, reactive power regulation control, smooth grid-connected to off-grid switching control, anti-islanding protection function, islanding detection for mode switching, and fault ride-through control function.

2. Battery polarity reverse connection protection, DC overvoltage protection, DC overcurrent protection, grid-side over/undervoltage protection, grid-side overcurrent protection, grid-side over/underfrequency protection, IGBT module overcurrent protection, IGBT module overtemperature protection, transformer/reactor overtemperature protection, lightning protection, and unplanned islanding protection.

1. The ventilation design meets the requirements of relevant standards, with an integrated air duct inside, paired with a micro-positive pressure air conditioner to maintain a balanced environment in the cabin. When forced ventilation is used, the fans are branded, long-life, maintenance-free axial flow fans; the number of fans meets the exhaust requirements, with exhaust undergoing multiple dust-proof treatments, and the dust-proof net is easy to disassemble and clean; the exhaust outlet is equipped with structures such as air valves to meet the overall protection level of the cabin.

2. The control box’s electric intake air valve and forced exhaust axial flow fans are controlled for start and stop. The total ventilation volume of the electric air valve and axial flow fans meets the requirement of replacing the air inside the cabin every 5 minutes. The intake air valve and axial flow fans are equipped with effective dust filtration devices to ensure the dust-proof capability of the box.

1. The materials used in the shell structure of the prefabricated outdoor all-in-one energy storage system have the ability to prevent fires inside or outside the pre-installed substation. The box walls adopt a 2mm or thicker galvanized sheet rolled composite design, with continuous sealed welding and polished surfaces for a smooth and flat finish. The doors use double-layer steel plates with dual sealing, and the box joints are sealed with sealing strips to provide dust-proof and rain/snow-proof protection. The interior wall panels of the prefabricated outdoor all-in-one energy storage system are lined with composite rock wool boards for thermal insulation. The floor is covered with anti-static flooring, effectively preventing static electricity, and offering flame-retardant, non-slip, soundproof, and wear-resistant surface properties.

2. The container box is coated with epoxy zinc-rich primer, epoxy intermediate paint, and polyurethane topcoat, with a film thickness of over 250μm. High-grade air filter cotton is installed on the container’s louvered windows to filter salt spray particles, thereby protecting the internal electrical equipment from salt spray corrosion. Each compartment of the switchgear is equipped with appropriate temperature and humidity control devices to prevent insulation degradation of electrical components and corrosion of metal materials due to condensation, along with fire prevention devices for safety and reliability. It offers excellent resistance to acid, alkali, salt spray, and other corrosive elements, making it suitable for various humid and highly corrosive environments. It features waterproofing, soundproofing, insulation, sealing, easy cleaning, easy maintenance, and an aesthetically pleasing appearance.

The energy metering cabinet (box) installed in the substation meets the provisions of GB/T 16934 and user requirements. High-voltage or low-voltage metering can be adopted based on user needs. 5G communication: Compatible with China's three major communication channels, enabling remote monitoring and control of the prefabricated outdoor all-in-one energy storage system’s status.

1. Integrated charge and discharge design, enabling bidirectional energy flow between AC and DC systems; efficient vector control algorithms for decoupled control of active and reactive power; adjustable power factor, capable of fully generating reactive power within capacity range for reactive power compensation.

2. Under the scheduling of MEMS (Microgrid Energy Management System), actively participates in grid peak shaving, effectively relieving pressure on the main grid; supports grid-connected and off-grid operation; enables smooth and seamless switching between grid-connected and off-grid modes; supports microgrid operation, providing stable voltage and frequency support for microgrids; combines active and passive islanding detection methods, meeting UL1741 standards; features comprehensive relay protection to prevent abnormal inverter damage; supports multiple types of energy storage batteries, with differences only in controller software; provides CAN and 485 interfaces for communication with the Battery Management System (BMS) and upper-level monitoring systems; supports multi-unit PCS parallel operation; supports short-term AC-side short-circuit operation mode; supports self-synchronization function; high-reliability cabinet design meets the needs of different operating regions; main power circuit uses high-reliability power modules.

It can be used in distributed generation systems such as wind and solar energy, ensuring the balance and continuity of distributed power supply, effectively improving the quality of its power output and enhancing grid integration capabilities. It can be used for power system stabilization, responding to load fluctuations through rapid energy storage, absorbing excess energy or supplementing energy deficits, achieving high-power dynamic regulation, and effectively adapting to frequency regulation and voltage power factor correction, thereby improving system operational stability. It can serve as an emergency power source, providing electricity to users during outages of the main grid or other power sources, enhancing power supply reliability.

It can be used for grid peak shaving and valley filling, alleviating supply-demand conflicts on the user side, reducing investment in power generation equipment, improving the utilization rate of electrical equipment, and reducing line losses. It can be used in microgrids as the main power source, providing voltage and frequency support for the microgrid, enabling wind and solar power to contribute to regional load supply within the microgrid. It can be applied to various types of energy storage components, achieving a flexible interface between energy storage and the grid, and meeting the requirements of independent or grid-connected operation.