The iron-lithium battery energy storage system can be used as a buffer between a variety of power sources and stable power demand, and can increase the power generation capacity of unstable power sources such as wind energy and solar energy. The output power of wind power generation system oscillates due to the change of wind speed, and the energy storage system can provide stability and reactive power compensation for wind turbine output through the characteristics of fast response speed and almost equal charging and discharging cycle. At the same time, the energy storage system can adjust the voltage and control the system frequency in the off-grid power generation system.
From an economic point of view, the direct consequence of uncertain power output is the decrease in customers' willingness to pay or the resulting decrease in capital credit. Configuring an energy storage system for wind turbines will fluctuate and provide stable power output to the grid, which will increase the price of wind power.
Iron Lithium Battery System Components
Control System
The lithium iron battery energy storage system is controlled by a programmable logic controller (PLC) and a human-machine interface (HMI). One of the key functions of the PLC system is to control the charging time and rate of the energy storage system. For example: PLC can receive real time data of electricity price, and decide how to quickly recharge the battery system based on the maximum allowable electricity demand, charging status, and price comparison during peak/off-peak hours. This decision is dynamic and can be optimized according to specific circumstances. Through standardized communication input, control signal and power supply, it is integrated with the rest of the system. It can be accessed via dial-up or the Internet. It has multiple defense layers to restrict access to its different functions, and provides customized reporting and alarm functions for remote monitoring.
Power Conversion System (PCS)
The function of the power conversion system is to charge and discharge the battery and provide improved power supply quality, voltage support and frequency control for the local grid. It has a complex and fast action, multi-quadrant, dynamic controller (DSP), with a dedicated control algorithm, can switch the output in the entire range of the device, that is, cyclically from full power absorption to full power output. It can work normally for reactive power and any combination of active and reactive power requirements.
Iron Lithium Battery Stack
The stack is composed of a number of single cells. The iron-lithium battery energy storage system can economically store and provide large-scale power according to demand, and the main mode is a fixed method. It is a long-life, low-maintenance, high-efficiency technology that supports stepless expansion of power and energy storage capacity. Energy storage systems are particularly effective for renewable energy suppliers, grid companies and end users.
The iron-lithium battery energy storage system can be applied to all links of the power supply value chain, which can convert intermittent renewable energy power such as wind energy and solar energy into stable power output; the most optimized solution for power supply in remote areas;
The deferral of fixed investment in the power grid, and the application of peak shaving and valley filling. The energy storage system can also be used as a backup power supply for substations and communication base stations. The iron-lithium battery energy storage system is environmentally friendly and has the lowest ecological impact among all energy storage technologies. At the same time, it does not use elements such as lead or cadmium as the main reactant.
Renewable Energy
The iron-lithium battery energy storage system can be used as a buffer between a variety of power sources and stable power demand, and can increase the power generation capacity of unstable power sources such as wind energy and solar energy. The output power of wind power generation system oscillates due to the change of wind speed, and the energy storage system can provide stability and reactive power compensation for wind turbine output through the characteristics of fast response speed and almost equal charging and discharging cycle. At the same time, the energy storage system can adjust the voltage and control the system frequency in the off-grid power generation system.
From an economic point of view, the direct consequence of uncertain power output is the decrease in customers' willingness to pay or the resulting decrease in capital credit. Configuring an energy storage system for wind turbines will fluctuate and provide stable power output to the grid, which will increase the price of wind power.
Remote area power supply
In sparsely populated remote areas, such as islands, diesel generators are often used as a single source of energy. Diesel generators often work at non-rated power due to changes in load, which reduces fuel efficiency by up to 30%.
Configuring an energy storage system for off-grid power supply systems can effectively reduce diesel consumption, operation and maintenance costs, greenhouse gas emissions and extend the life of diesel engines.
The proportion of wind power and photovoltaic power generation in the total diesel power generation is increasing. When the proportion reaches about 30%, the instability it brings will directly reduce the reliability of the local power grid, and the addition of more renewable energy should be restricted. Power generation. However, by configuring the energy storage system, the ratio can be achieved 100%, and the payback period of the project is shortened to 3 years. With the increase in fuel prices, the economy will become more significant.
Communication base station
The traditional battery system used in communication base stations is often used as a backup power source to ensure short-term or instant power failures of about 5-20 times a year. They do not require frequent deep charge and discharge cycles.
The target market of the 5KW-8 hours deep cycle energy storage system is the communication base stations in the off-grid or weak grid area, which will enable these communication base stations to achieve repeated cycles or use hybrid systems such as wind and solar power.
The energy storage system greatly reduces operating costs and diesel consumption, thereby prolonging the life of the diesel engine and reducing the sensitivity of the communication base station to environmental temperature changes.
Investment deferred
The iron-lithium battery energy storage system can be used to save the fixed equipment investment of the grid system; improve the utilization rate of grid equipment, reduce financial risks, avoid the occurrence of huge one-time investment and extremely low equipment utilization, and use the investment for more needs , More important occasions; reduce the use cost of end users. Other important advantages that energy storage systems can achieve in power transmission and distribution systems include:
Improve service reliability and power quality through reactive power compensation and voltage regulation;
Peak clipping and valley filling, storage of trough power for sale at peak times, thereby reducing the market risk of peak price fluctuations and controlling the high cost of energy imbalance; reducing line loss through local power supply, correcting power factor, and adjusting voltage; reducing line congestion, Provide smooth passage in the bottleneck part of energy supply; provide spinning reserve, reactive power, oscillation compensation and black start capability;
Basic users can use valley-value power at peak power consumption, increase the value of equipment and expand capacity.
cut peaks and fill valleys
The energy storage system can reduce the peak energy load of users at the distribution end, which will promote the utilization of grid equipment and meet the needs of end customers. The grid load factor is thus improved. The chart below shows that the selective release of electricity during peak electricity consumption can achieve significant energy savings
Smart grid
Smart grid is an important part of the future developed grid management system, and energy storage technology has a huge market space in it.
self-healing power transmission and distribution system
In order to meet the rapidly increasing demand for electricity consumption in society, it is necessary to vigorously develop a "self-healing" power transmission and distribution system to realize automatic prediction and rapid response to disturbances, thereby continuously optimizing power quality. The EPRI Power Technology Development Route report stated that [by 2020, the demand for high-quality power will spread to all corners of the economy and society."
The huge benefits of self-healing power grids include not only improving power reliability, but also continuing to improve end-customer services, reducing operating costs, and transmitting and distributing more effective power flux on the basis of the existing power network. Self-healing power grids also have a good defense against terrorist attacks. Typical goals to be achieved by self-healing power grids include:
Dynamic optimization of power grid system performance, rapid response to disturbances, to minimize the negative impact of disturbances, quickly and effectively resume operations.
Fully mobilize user response as an effective means to manage the grid. As the proportion of renewable energy in the grid system continues to increase, these unstable power sources will even more require smart grid and energy storage technology. A systematic approach to construct a self-healing power grid using demand-side management technology and energy storage.
The self-healing power grid control system includes a series of network nodes and linear and non-linear loads. The control sensor is used to monitor the power characteristics, the control relay is used to realize the communication with the nonlinear load, and the battery energy storage system realizes the connection between the main power source and the power node. The priority recovery controller is connected to the control sensor, control relay, and battery energy storage system. It receives control signals from the control sensor, responds to detecting irregularities in the grid, and automatically starts the battery energy storage system to provide stable power for the linear load. Selectively disconnect the control relay to disconnect a certain proportion of the non-linear load.
