Introduction to integrated optical storage and charging system
One : background
1.1 The pollution of the environment by traditional energy accelerates the rapid development of green energy.
Green energy, including solar energy, wind energy, bioenergy, etc., is increasingly valued by many countries, especially those with energy shortages, because they are non-polluting to the environment and have no possibility of energy depletion.
1.2 National policy strongly supports new energy.
In 2020, the release of the “Guiding Opinions on “Integration of Wind, Water, Fire and Storage” and “Integration of Source, Network, Load and Storage” (Draft for Comment)” was launched, proposing to actively explore “integration of wind, water, fire, storage” and “integration of source, network, load and storage”. ” Implementation path to improve the level of clean energy utilization and the operating efficiency of the power system. The source-network-load-storage collaborative service will be the key operation mode of the Energy Internet, which will realize the optimal allocation of social resources with high efficiency and low cost . President Xi Jinping delivered an important speech at the general debate of the seventy-fifth session of the United Nations General Assembly, “China will increase its nationally determined contributions and adopt more powerful policies and measures . to achieve carbon neutrality”. At the Climate Ambition Summit, President Xi Jinping delivered an important speech entitled “Building on the past and ushering in the future to start a new global journey to address climate change” via video, announcing a series of new measures for China’s nationally determined contributions. By 2030, China’s carbon dioxide emissions per unit of GDP will drop by more than 65% compared with 2005, non-fossil energy will account for about 25% of primary energy consumption, forest stock will increase by 6 billion cubic meters compared to 2005, wind power, The total installed capacity of solar power will reach more than 1.2 billion kilowatts.
1.3 Application of new energy business in various links.
New energy will play an important role in the “source-network-load-storage integrated collaborative service operation mode” of the power system, and the “load” where the gas station is located, due to the diversification of energy consumption forms , the proportion of electric energy in terminal energy consumption has increased. The elements of social participation are constantly enriched, and the willingness and ability to participate are constantly improving. In particular, emerging businesses (electric vehicles, distributed energy, and energy storage) have broad prospects for participating in social resource allocation. At present , Sinopec announced that during the “14th Five-Year Plan” period, Sinopec will accelerate the development of new energy business. 7,000 distributed photovoltaic power generation units are planned to be deployed
site. Only Sinopec Guangxi Branch will have 1,350 gas stations in the future to deploy solar storage and charging business.
1.4 The policies of solar energy storage in various regions are successively introduced.
With the substantial improvement of charging technology level and product quality of charging facilities, the charging standard system is gradually improved, the layout of charging facilities is fully optimized, the interconnection and interoperability of charging network is enhanced, the quality of charging operation service is rising step by step, and the scale of charging infrastructure construction is about to expand rapidly .
Two: engineering construction
2.1 Charging pile construction.
according to the number and capacity of charging vehicles in the area, the daily charging peak and low peak conditions, charging speed requirements, and the allowable power of the area; without affecting the normal charging operation, reduce the number of vehicles and piles The distance between them; when the machine is installed for the first time, leave a margin for the switch and cables to allow for later expansion; the low-voltage power distribution system is grounded in TN-S mode, and all electrical equipment in the charging station share a set of grounding devices, and its grounding resistance is not greater than 4
ohm.
2.2 Energy storage system construction.
Combined with the load power pressure brought by the charging pile to the grid , match the appropriate energy storage power and battery capacity, charge when the load is light , supply energy when the load is heavy, and assist the grid to carry the load. Containers are usually 20 feet or 40 feet, and they are placed and installed near the power distribution room. The AC and DC lines avoid crossing; the modular design shortens the construction period of the project and allows later expansion; in terms of safety, the battery compartment is separated by fireproof materials and monitored in real time through BMS Feedback exceptions.
2.3 Safe construction of energy storage.
2.3.1 EMS management system
Monitor the operating status of the entire energy storage system in real time, and make 24-hour long forecasts and 5-minute short forecasts for photovoltaic power generation and load power consumption.
2.3.2 BMS management system
Control the charging and discharging of the battery, monitor the battery, and provide protection and online maintenance functions.
2.3.3 Dynamic environment monitoring system
Monitor the operating status of the system and equipment in real time, record and process relevant data, detect faults in time and give early warning prompts.
2.3.4 Fire fighting system
As an emergency method, a layer of protection is added to the energy storage system.
2.4 Photovoltaic system construction.
Engineering features: The specifications, types, series numbers and installation angles of the photovoltaic modules of the same MPPT channel need to be consistent; the optimal operating voltage of the photovoltaic array should be within the MPPT range of the inverter; the open circuit voltage should be lower than the maximum input voltage of the inverter value.
