Introduction to solar and battery systems and their four application scenarios
2024-10-16
Solar and battery system refers to a system that stores the DC power converted by solar photovoltaic panels in a battery pack, and then converts the DC power into AC power through an inverter. It is an efficient energy storage technology that can improve the efficiency of solar energy utilization and achieve sustainable use of solar energy.
This article introduces the knowledge of solar and battery system and their four different application scenarios in detail.
Solar and battery system components
(1). Photovoltaic panels
The core of the solar and battery system is the photovoltaic panel, which can convert solar energy into direct current. There are many types of photovoltaic panels, including monocrystalline silicon, polycrystalline silicon, amorphous silicon and flexible photovoltaic panels. Among them, monocrystalline silicon photovoltaic panels have the highest conversion efficiency.
(2). Energy storage battery pack
Energy storage battery pack is a device for storing electrical energy, mainly including lead-acid batteries, lithium-ion batteries, flow batteries and other types. At present, lithium iron phosphate batteries are the most widely used battery type in solar and battery energy storage systems. Their advantages are high energy density, long life, and high charging and discharging efficiency.
(3). Inverter
Inverter is a key device for converting DC power into AC power in solar and battery energy storage system. It can convert DC power into AC power and supply power to household appliances. There are many types of inverters, including off-grid inverter, grid-connected inverter and hybrid inverter.
(4). Monitoring system
The solar and battery system also requires a monitoring system that can monitor the working status of photovoltaic panels, energy storage battery packs, inverters and other equipment in real time, detect problems in time and deal with them to ensure the reliable operation of the system.
In general, the photovoltaic energy storage system can improve the utilization efficiency of solar energy, reduce energy consumption, and achieve sustainable use of clean energy.
What are solar and battery energy storage systems?
Solar and battery systems are systems that use solar energy to store and generate electricity. In simple terms, Solar and battery systems consist of two major devices: photovoltaic equipment and energy storage equipment.
The photovoltaic equipment absorbs solar energy and converts it into electrical energy, and the energy storage equipment stores the electrical energy generated by the photovoltaic equipment. When the photovoltaic system is short of power, the energy storage system converts the stored electrical energy into the required AC power grid.
Benefits of solar and battery systems:
There are many benefits of photovoltaic plus energy storage.
First, it can ensure a more stable and reliable power supply.
The energy storage device is like a large battery that stores excess solar power. When there is insufficient sunlight or a high demand for electricity, it can provide electricity to ensure continuous power supply.
Secondly, solar and battery systems can also make solar power generation more economical.
By optimizing operation, it can make more electricity self-generated and self-used, reducing the cost of purchasing electricity. In addition, energy storage equipment can also participate in the power auxiliary service market to bring additional benefits. The application of energy storage technology makes solar power generation more flexible and meets various electricity needs. At the same time, it can also achieve the complementarity of multiple energy sources and the coordination of supply and demand together with virtual power plants.
Solar and battery systems, unlike pure grid-connected power generation, requires the addition of energy storage batteries and battery charging and discharging devices. Although the initial cost will increase to a certain extent, the scope of application is much wider.
Below we introduce the following four solar and battery systems application scenarios according to different applications: photovoltaic off-grid energy storage application scenario, photovoltaic off-grid energy storage application scenario, photovoltaic grid-connected energy storage application scenario and microgrid energy storage system application scenario.
01.Solar and battery off-grid energy storage system application scenarios.
Photovoltaic off-grid energy storage power generation system can operate independently without relying on the power grid. It is widely used in remote mountainous areas, areas without electricity, islands, communication base stations and street lights. The system consists of a photovoltaic array, a photovoltaic inverter, a battery pack, and power loads. The photovoltaic array converts solar energy into electrical energy when there is light, supplies power to the load through the inverter, and charges the battery pack at the same time; when there is no light, the battery supplies power to the AC load through the inverter.
Photovoltaic off-grid power generation systems are specially designed for use in areas without power grids or areas with frequent power outages, such as islands and ships. Off-grid systems do not rely on large power grids, but rely on the working mode of "storing while using" or "storing first and using later", which is a "helping hand in need". For families in areas without power grids or areas with frequent power outages, off-grid systems are very practical.
02. Solar and battery hybrid system application scenarios
Solar and battery hybrid energy storage systems are widely used in applications such as frequent power outages, or photovoltaic self-use without surplus power to the grid, high self-use electricity prices, and peak electricity prices that are much more expensive than trough electricity prices.
The hybrid solar and battery system consists of a photovoltaic array composed of solar cell modules, a solar grid-connected and off-grid integrated machine, a battery pack, and a load. The photovoltaic array converts solar energy into electrical energy when there is sunlight, and supplies power to the load through the solar control inverter integrated machine, while charging the battery pack; when there is no sunlight, the battery supplies power to the solar control inverter integrated machine, and then supplies power to the AC load.
Compared with the grid-connected solar and battery generation system, the off-grid solar and battery system adds a charge and discharge controller and a battery, and the system cost increases by about 30%-50%, but the application range is wider. First, it can be set to output at rated power when the electricity price is at its peak, reducing electricity expenses; second, it can be charged during the valley period of electricity prices and discharged during the peak period, making money by using the peak-valley price difference; third, when the power grid is out of power, the photovoltaic system continues to work as a backup power source, the inverter can be switched to off-grid working mode, and photovoltaics and batteries can power the load through the inverter. This scenario is currently widely used in developed countries overseas.
03 .Grid-connected solar and battery systems application scenarios
Grid-connected energy storage photovoltaic power generation systems generally operate in a photovoltaic + energy storage AC coupling mode. The system can store excess power generation and increase the proportion of self-generation and self-use. Photovoltaic is used in ground photovoltaic distribution storage, industrial and commercial photovoltaic energy storage and other scenarios. The system consists of a photovoltaic array composed of solar cell modules, a grid-connected inverter, a battery pack, a charge and discharge controller PCS, and power loads. When the solar power is less than the load power, the system is powered by solar energy and the grid together. When the solar power is greater than the load power, part of the solar energy is used to power the load, and part is stored through the controller. At the same time, the energy storage system can also be used for peak-valley arbitrage, demand management and other scenarios to increase the system's profit model.
As an emerging clean energy application scenario, photovoltaic grid-connected energy storage system has attracted much attention in the new energy market. The system combines photovoltaic power generation, energy storage devices and AC power grid to achieve efficient use of clean energy. There are several major advantages: 1. Improve the utilization rate of photovoltaic power generation Photovoltaic power generation is greatly affected by weather and geographical conditions, and is prone to power generation fluctuations. Through the energy storage device, the output power of photovoltaic power generation can be smoothed to reduce the impact of power generation fluctuations on the power grid. At the same time, the energy storage device can provide energy to the power grid under low light conditions to improve the utilization rate of photovoltaic power generation. 2. Enhance the stability of the power grid Photovoltaic grid-connected energy storage system can realize real-time monitoring and regulation of the power grid and improve the operation stability of the power grid. When the power grid fluctuates, the energy storage device can respond quickly, provide or absorb excess power, and ensure the smooth operation of the power grid. 3. Promote the consumption of new energy With the rapid development of new energy such as photovoltaic and wind power, the problem of consumption has become increasingly prominent. Photovoltaic grid-connected energy storage system can improve the access capacity and consumption level of new energy and alleviate the peak load pressure of the power grid. Through the scheduling of energy storage devices, the smooth output of new energy power can be achieved.
04 .Application scenarios of microgrid soalr and battery systems
As an important energy storage device, microgrid soalr and battery systems play an increasingly important role in the development of new energy and power systems in my country. With the advancement of science and technology and the popularization of renewable energy, the application scenarios of microgrid energy storage systems are constantly expanding, mainly including the following two aspects:
1). Distributed generation and energy storage system:
Distributed generation refers to the establishment of small-scale power generation equipment near the user side, such as solar photovoltaic, wind power, etc., and the storage of excess power generation through the energy storage system to provide electricity during peak power consumption or when the power grid fails.
2). Microgrid backup power supply:
In remote areas, islands and other places where grid access is difficult, microgrid energy storage systems can be used as a backup power supply to provide a stable power supply to the local area.
Microgrids can fully and effectively tap the potential of distributed clean energy through multi-energy complementation, reduce unfavorable factors such as small capacity, unstable power generation, and low reliability of independent power supply, ensure the safe operation of the power grid, and are a beneficial supplement to large power grids. Microgrid application scenarios are more flexible, with scales ranging from several kilowatts to tens of megawatts, and a wider range of applications.
The application scenarios of solar and battery systems are widely and diverse, covering off-grid, grid-connected and microgrid forms. In practical applications, each scenario has its own advantages and characteristics, providing users with stable and efficient clean energy. With the continuous development and cost reduction of photovoltaic technology, photovoltaic energy storage will play an increasingly important role in the future energy system. At the same time, the promotion and application of various scenarios will also help the rapid development of the global new energy industry and contribute to the realization of energy transformation and green and low-carbon development.
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