Four Photovoltaic Plus Energy Storage System Application Scenarios Are Presented

PV energy storage, different from pure grid-connected power generation, needs to add energy storage batteries, and battery charging and discharging devices, although the upfront cost needs to be increased, but the scope of application is much wider. Here we will describe the following four photovoltaic + energy storage application scenarios according to different applications: photovoltaic off-grid and photovoltaic off-grid, photovoltaic grid-connected energy storage and micro-grid energy storage system application scenarios.

1. Photovoltaic off-grid energy storage application scenarios

Photovoltaic off-grid energy storage power generation system can operate independently without relying on the power grid, and the main application scenarios include remote mountain areas, no-power areas, islands, communication base stations and street lights. The system mainly includes photovoltaic array, photovoltaic reverse control integrated machine, battery pack and electric load. When the light is present, the photovoltaic array converts the solar energy into electricity and provides electricity to the load through the reverse control integrated machine and charges the battery pack at the same time. In the absence of light, the battery provides electrical energy for the AC load through the inverter.

Photovoltaic off-grid power generation system is specifically for the use of no-grid areas or frequent power outage areas, such as islands, ships, etc., off-grid system does not rely on the large power grid, relying on the "side storage side use" or "first storage and then use" working mode, is the "snow supply" thing. Off-grid systems are highly practical for households in ungrid areas or in frequent power outages.

2. Photovoltaic and off-grid energy storage application scenarios

Photovoltaic and off-grid energy storage systems are widely used in frequent power outages, or photovoltaic self-use can not be surplus online, high self-use electricity prices, peak electricity prices are much more expensive than trough electricity prices and other applications.

The system includes solar cell modules photovoltaic array, solar and off-grid all-in-one, battery packs and loads. When the light is present, the photovoltaic array converts the solar energy into electrical energy and the solar controlled inverter provides electrical energy to the load and charges the battery at the same time. In the case of insufficient light, the battery is responsible for powering the solar-controlled inverter all-in-one and further providing power to the AC load.

Compared with grid-connected power generation systems, and off-grid systems add charge and discharge controllers and batteries, which causes the cost of the system to rise by about 30%-50%, but its application areas are more extensive. First, it can be set to the peak price of electricity according to the rated power output, reduce electricity costs; The other is to charge the price of electricity in the valley and put it in the peak, and make profit with the difference between peak and valley. In the case of power failure of the grid, the photovoltaic system continues to operate in the form of backup power, the inverter can be switched to off-grid operation, and the photovoltaic and battery can provide power to the load through the inverter. This scenario is now widely adopted by overseas developed countries.

3. photovoltaic grid-connected energy storage application scenarios

Grid-connected energy storage photovoltaic power generation systems generally use photovoltaic + energy storage to do AC coupling mode. The system can store excess power generation and increase the proportion of spontaneous self-use, and photovoltaic is used in ground photovoltaic storage and industrial and commercial photovoltaic energy storage scenarios. The system includes solar cell module, grid-connected inverter photovoltaic array, battery pack, charge and discharge controller PCS and electrical load. When the solar power is lower than the load power, the system will be jointly powered by solar energy and the grid; When the solar power exceeds the load power, part of the solar energy will supply power to the load, and the other part will be stored through the controller. The energy storage system can also be used to achieve peak and valley arbitrage and demand management scenarios to improve the system profit model.

As an emerging clean energy application scenario, photovoltaic grid-connected energy storage system has received extensive attention in China's new energy market. The system integrates photovoltaic power generation, energy storage device and AC power grid to make efficient use of clean energy. It has the following 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 and the impact of power generation fluctuations on the grid can be reduced. At the same time, the energy storage device can provide energy for the grid under low light conditions, improving 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 operational stability of the power grid. When the power grid fluctuates, the energy storage device can respond quickly to provide or absorb excess power to ensure the smooth operation of the power grid.
3. Promote new energy consumption: In the context of the rapid development of photovoltaic, wind power and other new energy, its consumption problem is becoming more and more prominent. The grid-connected photovoltaic energy storage system can improve the access capacity and consumption level of new energy and reduce the peak load pressure of the power grid. The smooth output of new energy power can be realized by dispatching the energy storage device.

4. Application scenario of micro-grid energy storage system

As an important energy reserve device, micro-grid energy storage system plays a more and more important role in the development of new energy and power system in our country. With the advancement of science and technology and the popularization of renewable energy, the application scenarios of micro-grid energy storage systems continue to expand, mainly including the following two aspects:

1. Distributed power generation and energy storage system: Distributed power generation refers to the establishment of small power generation equipment near the user side, such as solar photovoltaic, wind energy, etc., through the energy storage system to store excess power generation in order to provide electricity during peak periods or grid failures.
2. Micro-grid backup power supply: in remote areas and islands, the power grid is difficult to connect to the grid, micro-grid energy storage system can be used as a backup power supply to the local stable power supply.

With the characteristics of multi-energy complementarity, microgrid can fully and efficiently tap the potential of distributed clean energy, reduce adverse factors such as low capacity, unstable power generation and poor reliability of independent power supply, and ensure the safe operation of the power grid, which is a beneficial supplement to the large power grid. Microgrid has a more flexible application scenario, its scale can be from a few kilowatts to tens of megawatts, a wider range of applications.

The application scenarios of photovoltaic energy storage are rich and diverse, covering many forms such as off-grid, grid-connected and micro-grid. In practice, each type of scenario has its own advantages and characteristics, providing users with a stable and effective clean energy. With the continuous development of photovoltaic technology and cost reduction, 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 also contribute to the rapid growth of China's new energy industry, which is conducive to energy transformation and green accessibility.

"PaiduSolar" is a set of solar photovoltaic research, development, production, sales in one of the high-tech enterprises, as well as "the national solar photovoltaic project excellent integrity enterprise". Main solar panels, solar inverters, energy storage and other types of photovoltaic equipment, has been exported to Europe, America, Germany, Australia, Italy, India, Southeast Asia and other countries and regions.