Knowledge 1: Flywheel energy storage principle
Flywheel energy storage principle of operation in the electric power rich conditions, driven by the electric energy to high-speed rotation of the flywheel, electric energy into mechanical energy storage; when the system needs, flywheel deceleration, the motor as a generator operation, the flywheel kinetic energy into electrical energy for the user to use. Flywheel energy storage through the acceleration and deceleration of the rotor, to achieve the deposit and release of electrical energy.
Knowledge 2: Flywheel energy storage structure
The basic structure of the flywheel energy storage system consists of the following five components:
Flywheel Wheel:
Generally composed of high-strength composite fiber materials, through a certain way of winding in the motor rotor and the integration of the metal wheel on the Yi.
Bearings:
The flywheel is supported by permanent magnetic bearings, electromagnetic bearings, superconducting levitation bearings, or other low-friction power consumption bearings, and the bearings are mechanically protected.
Electric generator:
Generally DC permanent magnet brushless synchronous electric power generation mutually reversible two-way motor.
Power converter:
It is the input electrical energy into DC power supply motor, the output electrical energy for frequency regulation, rectification and then supplied to the load of the key components.
Vacuum chamber:
In order to reduce wind loss and prevent safety accidents in the high-speed rotation of the flywheel, the flywheel system is placed with a high vacuum sealing protection sleeve.
Knowledge 3: Advantages of flywheel energy storage
As a new type of physical energy storage, flywheel energy storage has the following advantages over traditional chemical batteries:
1) Rapid charging and discharging.
From the receipt of the grid side of the regulation signal to the flywheel energy storage system to respond, the time is very short, and after a few minutes to complete the whole system of the charging / discharging process, in line with the grid's short-term response and regulation needs, compared to the battery, pumped storage, compressed air, etc., has a faster charging / discharging time.
2) High efficiency.
General flywheel energy storage system efficiency can reach about 90%, compared to 60% of pumped storage and 70% of battery storage, has obvious advantages, and the use of magnetic levitation bearing flywheel energy storage system, its efficiency is higher, close to 95%.
3) Long service life.
Flywheel energy storage system is expensive, but well-designed, its average annual maintenance costs are very low, the number of charge and discharge is significantly better than the battery storage, etc., which reached a million orders of magnitude, and generally maintenance-free time is more than 10a.
4) Environmentally friendly and non-polluting.
Due to the mechanical energy storage, flywheel energy storage does not emit polluting substances, it is an environmentally friendly green energy storage technology. In addition, flywheel energy storage system also has the advantages of modularity, short construction time, and low impact of the consequences of accidents.
Knowledge Point 4: Flywheel energy storage applications ?
The application of flywheel energy storage technology is mainly focused on energy storage and peak power use of 2 categories, specific applications are reflected in the following aspects:
1) UPS uninterruptible power supply.
Uninterruptible power supply (UPS) is a device that utilizes an energy storage device to provide high-quality power to the load, and has a wide range of applications in the field of medical equipment, communications, and computer systems. At present, UPS gradually tend to use flywheel energy storage devices and other new energy storage devices, both to reduce environmental pollution, extend the service life, but also to improve efficiency.
2) Energy saving.
Energy utilization has been a topic of greater concern to us, energy saving has been widely **** knowledge. Traditional mechanical devices, mechanical braking energy is converted into heat and loss, resulting in a certain degree of waste, reducing the efficiency of energy use. Therefore, through the flywheel energy storage device to convert this part of the energy into kinetic energy storage, in the time of need, the output to the system, can reduce the energy loss, improve the utilization of energy, the current main areas of application are concentrated in the new energy vehicles and urban rail transit and so on.
3) Traditional power system.
Flywheel energy storage technology used in traditional power systems, which can better regulate active power, peak shaving and valley filling, increase the power factor, stabilize the voltage and frequency, and improve power quality and stabilize the load has a good effect. Transient stability has always been the focus of stable operation and analysis of power systems, relying on the flywheel energy storage of instantaneous power, rapid response, charging and discharging completion time is short, etc., put into the power system, can quickly and actively participate in the dynamic process of the power system, eliminating disturbances and shortening the transient process, try to avoid the emergence of voltage collapse, low-frequency oscillations and other dangerous conditions, for the recovery of the power system to a stable operation It plays a positive role in restoring the power system to stable operation.
4) Microgrid.
At present, the microgrid (Microgrid) as a small power generation and distribution system, can realize self-monitoring, self-regulation, both grid-connected operation, but also independent operation. Therefore, relative to the traditional large power grid, microgrid due to the characteristics of distributed power supply, flexible location, decentralized, etc., need to have the support of the energy storage system as a guarantee. In the microgrid energy is sufficient, flywheel energy storage system will be excess energy storage, stabilize the end voltage; when the microgrid failure, or power shortage phenomenon, will be stored energy release, enhance the local power supply reliability, maintain the frequency stability of the microgrid.
5) Grid-connection of renewable energy.
A key application area of flywheel energy storage technology is the grid connection of renewable energy. At present, wind power, photovoltaic power generation and other new energy because of clean, huge, renewable and other advantages, by more and more attention. However, due to the intermittency and volatility of wind and other renewable energy sources, the impact of the grid is increased after grid integration, which has a certain impact on the safe and stable operation of the power system. The flywheel energy storage system as a flexible regulation of the active source, can stabilize the grid frequency and voltage, reduce the volatility of renewable energy, peak shaving to fill in the valley, reduce the impact on the grid, effectively improve the renewable energy grid-connected process of power quality problems, to ensure security and reliability.
About MicroControl New Energy
MicroControl New Energy Technology (MicroControl or MicroControl New Energy) is a global leader in physical energy storage technology. The company's global headquarters is located in Shenzhen, and its business covers North America, Europe, Asia, Latin America and other regions. With the world's leading magnetic levitation energy technology of "safety, reliability, and high efficiency", the company's products and services have been widely trusted by many of the world's top 500 companies, such as Huawei, GE, ABB, Siemens, Emerson, etc.
We are committed to providing the best possible energy storage solutions for our customers.
Facing the three major trends of "cleaner, higher density, and digitalization" of future energy, the company continues to devote itself to providing system solutions for energy transportation, storage, recovery, and data management for strategic emerging industries.