1.application background
Global energy supply is tight, electricity costs are high, some countries and regions frequent power cuts, new power systems superimpose energy transition opportunities, in order to ensure daily electricity demand, distributed photovoltaic and energy storage demand is rising rapidly.
In contrast, under the instructions of the National Energy Administration to "adhere to centralized and distributed", China's distributed photovoltaic is also catching up. In 2021, China's new installed capacity of distributed PV exceeded that of centralized PV for the first time. In the first three quarters of this year, the new installed capacity of distributed PV in the country was 67.14 million kilowatts, accounting for 52% of all new installed capacity of photovoltaic, and the new installed capacity of distributed PV has accounted for more than 50% for three consecutive years.
2.Demand for integrated light storage
Distributed photovoltaic has the characteristics of multiple points and wide areas, dispersed layout, for large-scale random intermittent power supply, local distribution network facilities access capacity, power grid regulation capacity has also been tested. Therefore, many places have begun to require distributed new energy to build energy storage in proportion, and many documents have proposed to promote the integration of light storage, direct and soft, and source and network load and storage.
3.Value analysis of light storage fusion
Light storage integration is an inevitable trend, and provincial energy storage policies have been introduced, driving the demand for power system energy storage configuration, and the advantages of light storage integration development business model have been further highlighted.
The advantages of industrial and commercial light storage systems are prominent. Under the trend of increasing peak-valley price difference, industrial and commercial enterprises have highlighted the advantages of installing optical storage systems to reduce electricity costs. At present, China adopts two-part electricity price for large industrial electricity with transformer capacity of 315 kVA and above, and the optical storage system can achieve double reduction of two-part electricity charges.
Distributed photovoltaic "self-use", combined with the reasonable use of energy storage systems during peak and valley periods, effectively reduce the actual cost of electricity. The use of light storage fusion scheme, in the valley of electricity price to buy low-priced electricity and synchronous storage of excess photovoltaic power generation, in the peak of electricity price by energy storage release to supply the load, can maximize the capacity of the peak and valley price difference, greatly reduce the actual electricity costs, while improving the utilization rate of photovoltaic and power generation. Economically speaking, the light storage integration project can also use energy storage to participate in power market trading, earn the peak-valley difference, demand response subsidies, auxiliary service costs, etc., and obtain additional benefits. In addition, energy storage can also be used as a backup power supply for enterprises to face industrial and commercial scenarios, from the perspective of income, distributed photovoltaic + energy storage integration has more advantages.
4.case introduction
project overview
Optical storage system design scheme
The FGI system in this project integrates a set of converter booster system, including 1250kW PCS and supporting transformers. The complete set of equipment has external communication function, equipped with RS485, TCP/IP Ethernet and dry contact interface. The output voltage of the high voltage side is 10kV. At the ambient temperature of 45 ° C, 110% overload is allowed to run for a long time, and at the ambient temperature of 50 ° C, the operation is reduced. In addition to the control function of switching normal load, the inlet and outlet lines should also have the basic protection function of abnormal tripping such as over current and over load.
Project highlights
Through the synergistic effect of light storage, the project helps new energy to be connected to the grid and consumed, and further promotes the integrated application of light storage. FGI energy storage PCS booster machine, with intelligent forced air cooling function, as well as a wide temperature range of -30℃-60℃, can run fully under 50℃ environment; IP55 protection design, support high and low voltage crossing, can easily cope with extreme temperature, high humidity and other complex application environment.
project benefit
This project is mainly used for peak cutting and valley filling, with a monthly income of 120,000 yuan, which has a good demonstration and promotion significance.
