What is the way of energy storage in the power supply? First, let's take a look at some common energy storage methods:

    In recent decades, the research and development of energy storage technology has been paid more attention to by the energy, transportation, power, telecommunications and other sectors of various countries. Electric energy can be converted into chemical energy, potential energy, kinetic energy, electromagnetic energy and other forms of storage. According to its specific methods, it can be divided into three types: mechanical energy storage, electromagnetic energy storage and chemical energy storage. Mechanical energy storage includes pumped storage, compressed air energy storage and flywheel energy storage; electromagnetic energy storage includes superconductivity, supercapacitor and high energy density capacitor energy storage; electrochemical energy storage includes lead acid, nickel metal hydride, nickel cadmium, lithium ion, sodium sulfur and liquid flow battery energy storage.

pumped storage

    Pumped storage was first used in Italy and Switzerland in the 1890s. At present, more than 90GW of pumped storage units are put into operation in the world. Pumped storage power station is the biggest characteristic of the storage energy is very big, is the most widely used in the power system of an energy storage technology, storage energy release time from a few hours to a few days, its main application areas including peak shaving, frequency modulation, phase modulation, emergency standby, black start and provide system backup capacity, also can improve the operation efficiency of thermal power plant and nuclear power plant in the system. From the technical perspective, the key of pumped storage power station is how to realize the rapid conversion between electric energy and high water level potential energy, and the design and manufacturing of pumped storage unit is the key.

Compressed air for energy storage

    Compressed air energy storage power station (CAES) is a gas turbine power plant, which mainly uses the surplus power during the trough of the grid load to compress air, and stores it in a high-pressure sealing facility with a typical pressure of 7.5MPa, and releases the peak to drive the gas turbine for power generation. For the same output, it consumes 40% less gas than a conventional gas turbine. The construction investment and power generation cost of compressed air energy storage power station are lower than those of pumped storage power station, but its energy density is low, and it is limited by topographic conditions such as rock strata. Compressed air energy storage power station can start cold and black, with fast response speed. It is mainly used for peak and valley energy recovery adjustment, load balance, frequency modulation, distributed energy storage and power generation system backup.

Flywheel energy storage

    Most flywheel energy storage system is composed of a cylindrical rotating mass block and through the magnetic suspension bearing support mechanism, flywheel system running in high vacuum environment, flywheel is connected to the motor or generator, its characteristic is no friction loss, wind resistance, long life, no impact on the environment, almost no need to maintenance. During the valley load, the flywheel energy storage system is supplied by the power frequency grid to drive the flywheel to rotate at high speed and store energy in the form of kinetic energy. During the peak load, the high-speed rotating flywheel is used as the prime motor to generate electricity, and the mechanical energy-electric energy conversion through the power converter. The flywheel has excellent recycling and load tracking performance, which is mainly used for uninterruptible power supply / emergency power supply, power grid peak regulation and frequency control. The mechanical flywheel system has become a series of products.

Superconducting magnetic energy storage

    Superconducting magnetic energy storage system (superconducting magneticEnergy storage, SMES) uses the coil made of superconductor to store magnetic field energy, due to the rapid electromagnetic response characteristics and high energy storage efficiency. Superconducting magnetic energy storage can meet the transmission and distribution network voltage support, power compensation, frequency adjustment, improve system stability and power transmission capacity. Compared with other energy storage technologies, superconducting magnetic energy storage is still very expensive, and in addition to the cost of superconductivity itself, the cost of maintaining low temperature is also considerable. At present, there are many superconducting magnetic energy storage projects in the world that are in progress or in the development stage.

Supercapacitor energy storage

    Compared to conventional capacitors, supercapacitors have a higher dielectric constant, greater surface area, or higher voltage resistance. The price of supercapacitors is relatively expensive, which is mostly used in the power system for short-time and high-power load smoothing and power quality peak power occasions, such as the starting support of high-power DC motor, dynamic voltage recovery device, etc., to improve the power supply level during voltage sag and transient interference. After three generations and decades of development of supercapacitors, the maximum energy storage of the energy storage system reaches 30 MJ. Currently, the fourth generation of supercapacitors based on the activated carbon duplex electrode and the lithium-ion insertion electrode is under development.

Battery energy storage

    The battery energy storage system mainly uses the REDOX reaction of the positive and negative battery to charge and discharge. It mainly includes lead acid battery, nickel cadmium battery, lithium ion battery, sodium sulfur battery, full alum flow battery, etc. The energy storage capacity of lead-acid batteries has reached 20MW. Lead-acid battery provides closed power supply for circuit breaker in the normal operation of power system, plays the role of independent power supply when power plant and substation power supply is interrupted, and provides power for relay protection device, drag motor, communication and accident lighting. However, its cycle life is short, and there is some environmental pollution in the manufacturing process. Nickel-cadmium batteries have high efficiency and long cycle life.

    What is the way of energy storage in the power supply? The energy storage power supply is the lithium ion cell, so if he calculates by division, it belongs to the way of battery energy storage!