Special High-power Bidirectional DC/DC for Liquid Flow Battery Energy Storage System - Shanghai Wenlida Power Electronics Co., Ltd.
I. Product Design and Features
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Fully Digital Design: Wenlida's high-power bidirectional DC/DC converter adopts a fully digital design, enabling precise control. In the complex operating environment of liquid flow battery energy storage systems, it can accurately regulate various parameters during the power conversion process to ensure stable output. With a full-load efficiency of up to 98%, it significantly improves energy utilization efficiency, reduces energy loss during conversion, and cuts down operating costs.
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Multi-unit Parallel Technology: It supports multi-unit parallel operation, a feature that allows it to easily meet high-power and high-current requirements. In large-scale energy storage projects, the power of a single DC/DC module may not be sufficient for the system. By connecting multiple units in parallel, just like combining several "small engines" into a "super engine", the overall power output of the system can be greatly enhanced. Meanwhile, multi-unit parallel operation also increases the redundancy of the system. When an individual module fails, other normal modules can continue to operate, maintaining the basic operation of the system, reducing the risk of system shutdown due to module failure, and improving production efficiency and system reliability. For example, in some megawatt-level liquid flow battery energy storage power stations, high-power bidirectional DC/DC converters connected in parallel can efficiently achieve bidirectional energy flow between the energy storage system and the power grid.
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Wide Voltage Range Adaptability: Take the 800V series high-power bidirectional DCDC (water-cooled) as an example, it can adapt to the voltage changes of different energy storage batteries such as fuel cells, liquid flow batteries, and lithium batteries. During the charging and discharging process of liquid flow batteries, their terminal voltage fluctuates within a certain range. This DC/DC converter can automatically adjust to ensure voltage matching with the battery, guaranteeing stable power transmission and conversion. For instance, in some liquid flow batteries, the voltage may gradually rise during charging and gradually decrease during discharging. This DC/DC converter can well adapt to such voltage changes and maintain stable system operation.
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Soft Start Function: With special control algorithms and circuit designs, it has a soft start function. During the startup process, it slowly increases the output power, giving the liquid flow battery and the load enough time to adapt to the changes in current and voltage. This avoids the current surges that may occur in traditional startup methods, reduces the risk of damage to the battery and load equipment, and extends the service life of the equipment. At the same time, the soft start function can also reduce electromagnetic interference during startup, improve the stability and reliability of the entire power system, and provide strong support for the safe operation of the equipment.
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Modular Design Concept: It follows the modular design concept, breaking down the complex system into independent yet collaborative modules. Each module has standardized interfaces and dimensions, which brings great convenience to equipment maintenance and upgrades and effectively reduces maintenance costs. When the equipment malfunctions, maintenance personnel can quickly and accurately locate the faulty module and only need to replace the corresponding module, without the need for large-scale disassembly and repair of the entire equipment, greatly shortening the maintenance time and improving the availability of the equipment. Users can also choose to replace or upgrade certain modules according to actual needs to achieve performance enhancement and function expansion of the equipment without having to scrap the entire device, thus effectively protecting the user's investment.
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Intelligent Control and Monitoring: It is equipped with advanced microprocessors and intelligent control algorithms, which can real-time monitor the operating status of the power system, the performance of the liquid flow battery, and the load demand. Based on these real-time data, it can automatically adjust the output parameters of the electric energy to ensure that the liquid flow battery always operates in the best state, improving the utilization efficiency of the electric energy and reducing energy waste. For example, when it detects a sudden increase in load power, it can quickly adjust the output to meet the load demand while ensuring reasonable battery discharge; when it detects a low battery level, it can optimize the charging strategy to improve charging efficiency. This intelligent control function also reduces the need for manual intervention and lowers operation and maintenance costs, providing users with a more convenient and efficient power conversion solution.
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Bidirectional Power Conversion: It supports bidirectional power conversion, acting like a flexible traffic controller, and can adapt to various different operating modes of liquid flow batteries. In the charging mode, it efficiently converts the electric energy from external power sources into chemical energy storable in liquid flow batteries; in the discharging mode, it can quickly convert the chemical energy stored in liquid flow batteries into electric energy for output, supplying power to the load or feeding it back to the power grid. This bidirectional power conversion capability greatly improves the flexibility and efficiency of liquid flow battery utilization, enabling it to better adapt to different application scenarios, such as charging and discharging cycles of energy storage systems, grid-connected power generation of renewable energy, etc., providing strong support for achieving efficient energy utilization and storage.
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Efficient Heat Dissipation Technology: It adopts efficient heat dissipation technologies, such as liquid cooling technology applied in some products. Through the efficient circulation of the coolant inside the equipment, it can quickly remove a large amount of heat generated during the equipment's operation, effectively maintaining the working temperature of the DC/DC converter within a reasonable range. This not only improves the reliability of the equipment, avoiding performance degradation and failures caused by overheating, but also extends its service life, ensuring that the DC/DC converter can operate stably during long-term and high-intensity work. At the same time, the heat dissipation technology can be intelligently adjusted according to the actual working conditions of the equipment and the ambient temperature, ensuring that the equipment maintains a suitable working temperature under various operating conditions and providing strong support for the continuous and stable operation of the liquid flow battery system.
II. Application Scenarios
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Energy Storage Field
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Liquid Flow Battery Energy Storage Power Stations: In large-scale liquid flow battery energy storage power stations, Wenlida's high-power bidirectional DC/DC converter, as a core device, undertakes the key task of efficient energy conversion between the energy storage system and the power grid. During the low-power consumption period of the power grid, it converts the excess electric energy of the grid into appropriate voltage and current to charge the liquid flow battery, realizing the storage of electric energy; during the peak power consumption period, it can quickly convert the electric energy stored in the liquid flow battery and transmit it back to the power grid, relieving the power supply pressure of the grid, playing the role of peak shaving and valley filling, improving the stability of the power grid and the power quality, and at the same time reducing the electricity costs of users.
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Second-life Utilization of Retired Batteries: With the development and upgrading of battery technology, a large number of retired batteries need to be properly disposed of. The special high-power bidirectional DC/DC converter for liquid flow battery energy storage systems can be applied to the second-life utilization scenarios of retired batteries. Through its precise voltage conversion and power management functions, retired batteries can be reintegrated and utilized to build small-scale energy storage systems. These systems can be used in scenarios with relatively low requirements for power quality, such as small power supply stations in remote areas, charging of low-speed electric vehicles, etc., realizing the reuse of resources and reducing the cost of energy storage systems.
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Power Support
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DC UPS (Uninterruptible Power Supply): In places with extremely high requirements for power supply stability, such as data centers, hospitals, and financial institutions, DC UPS is an important device to ensure the continuous operation of critical equipment. Wenlida's high-power bidirectional DC/DC converter can convert the mains power into an appropriate DC voltage to charge the battery when the mains power is normal; when the mains power is interrupted, it can quickly convert the electric energy of the battery into a stable DC output to supply power to the load, ensuring that the equipment is not affected by fluctuations and interruptions of the mains power, maintaining the normal operation of the business, protecting key data from loss, and avoiding huge losses caused by power outages.
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Transient Support for Power Systems: In power systems, transient faults such as voltage sags and short-term power outages may occur. The special high-power bidirectional DC/DC converter for liquid flow battery energy storage systems can form a transient support system with liquid flow batteries. When it detects voltage sags or power outages in the power grid, it can quickly release the electric energy stored in the liquid flow battery into the power grid, providing temporary power support for the grid, maintaining grid voltage stability, ensuring the normal operation of sensitive equipment in the power system, and improving the reliability and stability of the power system.
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Photovoltaic-Storage-Charging and Microgrid Applications
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Photovoltaic-Storage-Charging Integrated Charging Stations: In photovoltaic-storage-charging integrated charging stations, the electric energy generated by solar photovoltaic panels, the electric energy input from the power grid, and the electric energy stored in liquid flow batteries need to be reasonably allocated and managed. Wenlida's high-power bidirectional DC/DC converter can achieve efficient conversion and coordinated control among these three energy sources. When the sunlight is sufficient, it converts the photovoltaic electric energy into an appropriate voltage to charge the liquid flow battery or directly charge electric vehicles; during the low-power consumption period of the power grid, it uses low-cost electricity to charge the battery; when the demand for electric vehicle charging is high, it converts the electric energy of the battery into the required voltage and current for charging, meeting the fast charging needs of vehicles, improving the energy utilization efficiency and economic benefits of the charging station, and at the same time reducing the impact on the power grid.
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AC-DC Hybrid Microgrids: AC-DC hybrid microgrids include various distributed energy sources (such as solar energy, wind energy, etc.), energy storage devices (such as liquid flow batteries, etc.), and different types of loads (AC loads and DC loads). This high-power bidirectional DC/DC converter, as a key component of the energy router, can achieve efficient conversion and flexible allocation between different voltage levels and different energy forms. For example, it can convert the DC power output from solar panels into AC power suitable for AC loads, or convert the DC power of liquid flow batteries into DC power of different voltage levels for DC loads, optimizing the energy flow within the microgrid, improving the stability and reliability of the microgrid, and promoting the widespread application of distributed energy sources.
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Industrial Energy Saving
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Large Industrial Scenarios such as Ports, Oilfields, and Steel Mills: In ports, loading and unloading equipment starts and stops frequently, consuming a large amount of electric energy. By combining Wenlida's high-power bidirectional DC/DC converter with energy storage devices such as supercapacitors and liquid flow batteries, energy can be stored when the equipment is idle and released during high-power demand moments such as equipment startup, reducing the instantaneous high-power impact on the power grid and achieving energy savings. In oilfields, a large amount of energy is wasted during the operation of equipment such as oil pumps. Using this DC/DC converter and energy storage system, the energy during the deceleration and braking processes of the equipment can be recovered and stored for subsequent equipment operation, improving energy utilization efficiency. For large motors and other equipment in steel mills, by configuring this DC/DC converter and energy storage, the power supply mode of the equipment can be optimized, energy consumption can be reduced, and the comprehensive power saving rate can reach a certain proportion, effectively reducing the electricity costs of industrial enterprises and achieving the goal of energy conservation and emission reduction.
III. Product Advantages
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High Efficiency and Energy Saving: With a full-load efficiency of up to 98%, it significantly reduces energy loss during power conversion. Whether in the charging or discharging process of the energy storage system, it can ensure that more electric energy is effectively utilized. Compared with traditional DC/DC devices, it can significantly reduce operating costs, improve energy utilization efficiency, conform to the current development trend of green energy conservation, and save users a large amount of electricity expenses.
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High Reliability: The redundant design brought by the multi-unit parallel technology, as well as the perfect fault detection and protection mechanisms, such as multiple protections against overvoltage, undervoltage, overcurrent, and overtemperature, enable the equipment to operate stably in complex working environments. The modular design facilitates quick location and replacement of faulty modules, reducing equipment downtime and improving the availability and reliability of the system. The intelligent control and monitoring system can grasp the operating status of the equipment in real time and adjust working parameters in a timely manner, further ensuring the reliable operation of the equipment and reducing equipment maintenance and repair costs.
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Flexible Adaptability: It can adapt to various types of energy storage batteries and different application scenarios. Its wide voltage range adaptability allows it to be well-matched with energy storage batteries of various voltage levels, such as liquid flow batteries, fuel cells, and lithium batteries; the bidirectional power conversion function meets the requirements of different operating modes of energy storage systems; the modular design enables users to flexibly configure the number and combination of modules according to actual needs, realizing the customization of the equipment and improving the versatility and applicability of the product.
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Advanced Technologies and Processes: It is manufactured using advanced fully digital design, intelligent control algorithms, efficient heat dissipation technologies, as well as high-quality materials and processes. These advanced technologies and processes not only ensure the high performance and high reliability of the product but also give the product obvious advantages in terms of service life, stability, etc. For example, the efficient heat dissipation technology ensures that the equipment can operate normally in high-temperature environments and extends the service life of the equipment; high-quality materials and processes improve the anti-interference ability and protection performance of the product, enabling it to adapt to various harsh working environments.
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Customized Services: Shanghai Wenlida Power Electronics Co., Ltd., with its rich industry experience and professional technical team, can provide customized solutions for special high-power bidirectional DC/DC converters for liquid flow battery energy storage systems according to specific customer needs. Whether in terms of product functional characteristics, power levels, or appearance dimensions, installation methods, etc., it can tailor the most suitable products for customers, meet the diverse needs of different customers, and provide comprehensive technical support and after-sales services.
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