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Key Technology and Application of Energy Storage System

  The microgrid system architecture includes energy storage, photovoltaics, wind turbines, etc. The energy storage system is the core component of the microgrid and is often used together with photovoltaics and wind power. Because battery energy storage has the advantages of relatively mature technology, large capacity, safety and reliability, low noise, strong environmental adaptability, and easy installation, batteries are often used in energy storage systems to store electrical energy. At present, energy storage systems are mainly composed of energy storage units and monitoring and control systems. The dispatch management unit consists of the energy storage unit including the energy storage battery pack (BA), the battery management system (BMS), the energy storage converter (PCS), etc.; the monitoring and dispatch management unit includes the central control system (MGCC), the energy management system (EMS) etc.

  

Energy storage system includes energy and material input and output, energy conversion and storage equipment. An energy storage system often involves multiple energies, multiple devices, multiple substances, and multiple processes. It is a complex energy system that changes with time, and requires multiple indicators to describe its performance. Commonly used evaluation indicators include energy storage density, energy storage power, energy storage efficiency, energy storage price, and environmental impact.

The basic task of energy storage systems is to overcome temporal or local differences between energy supply and demand. There are two situations for this difference. One is caused by sudden changes in energy demand, that is, there is a peak load problem. The energy storage method can play a role in regulating or buffering when the load change rate increases. Since the investment cost of an energy storage system is relatively lower than that of building a peak load plant, although the energy storage device will have storage losses, it can still reduce fuel costs because the stored energy comes from excess energy or new energy from the factory . The other is caused by reasons such as primary energy and energy conversion devices. The task of the energy storage system (device) is to balance the energy output, that is, not only to reduce the peak of the energy output, but also to fill the gap in the output. Trough (i.e. valley filling).

Common characteristics of energy storage systems:

① The energy stored per unit volume (volume heat storage density) is high, that is, the system stores as much energy as possible. For example, high-energy batteries are popular among consumers because of their higher energy density and longer service life than ordinary batteries.

②It has good load regulation performance. When the energy storage system is in use, it needs to adjust the amount of energy it releases according to the requirements of the energy user. The performance of load regulation determines the performance of the system.

③Energy storage efficiency should be high. Energy storage is inseparable from energy transfer and conversion technology, so the energy storage system should be able to receive and release energy at the maximum rate without excessive driving force. At the same time, the leakage, evaporation, friction and other losses in the energy storage process are reduced as much as possible to maintain a high energy storage efficiency.

④The system cost is low and the long-term operation is reliable. If the energy storage device is not economically justified, it will not be possible to be widely used.

 

The energy storage system can be connected to the power grid as an independent system, which can play the role of peak shaving and valley filling and reactive power compensation for the power grid; the energy storage system can also form a wind-solar storage system together with new energy power generation to smooth the new energy grid-connected power on the power generation side ; The energy storage system can also be built together with wind power generation, photovoltaic power generation and other new energy power generation systems in the load center to form a micro-grid system to improve energy utilization efficiency, improve power quality, improve power supply reliability, and reflect green environmental protection. According to the new energy access mode, the energy storage microgrid system can be divided into two control modes: common DC bus and common AC bus. The micro-grid power supply is realized through the multi-directional converter system to ensure the uninterrupted operation of the power load even in the state of grid power failure. Through the optimal configuration of batteries, inverters, bidirectional converters, and wind and solar equipment, Jiaogu Solar can realize engineering consulting, design, system integration, and station-level solutions for projects such as energy storage systems, wind and wind storage systems, and energy storage microgrid systems. monitoring etc.




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