From solar panels to charging stations: How to achieve a full closed-loop of power generation-storage-usage with one-stop new energy solutions?

1. Overview of One-Stop New Energy Solutions

A one-stop new energy solution from photovoltaic panels to charging piles refers to the organic integration of photovoltaic power generation, energy storage, charging piles, and other components to provide users with comprehensive energy services. This solution holds significant importance as it enables local energy consumption, reduces transmission losses, and enhances energy utilization efficiency. For users, it eliminates the need to separately manage power generation, storage, and consumption, allowing them to enjoy convenient, efficient, and green energy services while lowering energy costs. For society, it helps promote the adoption of new energy, facilitate energy structure transformation, and contribute to achieving carbon neutrality goals.

2. Photovoltaic Power Generation System

2.1 Principles and Technology of Photovoltaic Power Generation

The principle of photovoltaic power generation is based on the photovoltaic effect, which utilizes semiconductor interfaces to convert solar energy into electrical energy. When sunlight irradiates semiconductor materials, photons are absorbed, generating electron-hole pairs. Under the built-in electric field of the semiconductor PN junction, electrons and holes are separated, with electrons flowing toward the N region and holes toward the P region, thereby creating a voltage across the PN junction. Connecting the PN junction to a circuit can generate current, achieving photovoltaic conversion. Key technologies include monocrystalline silicon, polycrystalline silicon, and thin-film solar cell technologies. Monocrystalline silicon cells offer high conversion efficiency but higher costs; polycrystalline silicon cells have lower costs but slightly lower efficiency; thin-film cells are cost-effective and lightweight, though their current conversion efficiency remains relatively low.

2.2 Construction and Operation of Photovoltaic Power Stations

The construction of photovoltaic power stations involves numerous key points, with site selection being crucial. Factors such as solar radiation resources, land availability, and grid connection conditions must be comprehensively considered. Typically, locations with ample sunlight, flat and open terrain, proximity to load centers, and convenient grid access are preferred. During construction, strict adherence to relevant standards is required for design and implementation to ensure the quality and safety of the power station. For operation and maintenance, regular inspections, cleaning, and maintenance of photovoltaic modules, inverters, and other equipment are necessary to promptly identify and address faults, ensuring normal operation. Additionally, attention must be paid to power generation efficiency, optimizing operational strategies through data analysis and other methods to enhance output and economic benefits.

2.3 Remote Monitoring System for Photovoltaic Power Stations

The remote monitoring system for photovoltaic power stations consists of data acquisition devices, communication networks, and a monitoring center. The data acquisition devices are installed on-site at the power station to collect real-time data on the operational status of photovoltaic modules and environmental parameters. The communication network transmits this data to the monitoring center, where it is processed and analyzed, and displayed in graphical or tabular formats to show the power station's operational status. Managers can remotely access information such as power generation and equipment malfunctions to promptly monitor the power station's operations. In the event of equipment failure or operational anomalies, the system automatically triggers alarms, enabling managers to respond quickly and address issues, significantly improving power station management efficiency and reducing operational costs.

III. Energy Storage System

3.1 Types and Characteristics of Energy Storage Technologies

Energy storage technologies are diverse and varied. Battery storage utilizes electrochemical energy, with lithium-ion batteries offering high energy density and long cycle life, sodium-sulfur batteries providing large capacity and high-power output, lead-carbon batteries featuring low cost and excellent reliability, and vanadium redox flow batteries boasting long lifespan and high safety. Pumped hydro storage is mature and economically viable, enabling large-scale development, while compressed air energy storage has low construction costs and strong environmental adaptability. Flywheel energy storage delivers high power density and rapid response. Thermal energy storage stores energy in thermal form, and hydrogen energy storage employs hydrogen as a medium, both finding extensive applications in specific scenarios.

3.2 The Role of Energy Storage Systems in Renewable Energy Solutions

Energy storage systems are a crucial component of renewable energy solutions. In terms of regulating power supply and demand, they can store excess electricity when generation exceeds consumption and release it when consumption surpasses generation, thereby balancing supply and demand. Regarding energy efficiency, renewable power generation is intermittent and fluctuating. Energy storage systems can store this intermittent electricity and release it when needed, ensuring continuous and stable power supply. This reduces curtailment of wind and solar power, enhances energy utilization, integrates renewables more effectively into the grid, and provides strong support for energy transition.

3.3 Design and Application of Energy Storage Systems

The design of energy storage systems must comprehensively consider factors such as energy density, power density, cycle life, and safety, tailored to the requirements of specific application scenarios. In residential settings, small-scale storage systems can be used to store self-generated solar power for household consumption, smoothing out electricity demand. In commercial and industrial sectors, large-scale storage systems can participate in power market peak shaving and frequency regulation, reducing corporate electricity costs. On the grid side, storage systems can be employed to build virtual power plants, enhancing grid stability and reliability. For instance, Tesla's Powerwall has been successfully deployed in both residential and commercial applications, while Sonnen's storage systems have also played a significant role in distributed energy management.

4、 Charging station system

4.1 Types and functions of charging stations

Charging stations are divided into AC charging stations and DC charging stations according to the charging method. The AC charging station inputs AC power and outputs AC power. Its main functions include providing standard interfaces, measuring power, and human-machine interaction. It is suitable for both home and commercial places, providing slow charging services for electric vehicles. The DC charging station inputs three-phase four wire AC380V ± 15% AC power and outputs adjustable DC power, which can directly charge the power battery of non vehicle electric vehicles. It has high power and fast charging speed, and is mostly used in highway service areas, bus stations and other scenarios, allowing electric vehicles to quickly replenish electricity.

4.2 Layout and Planning of Charging Stations

The layout of charging stations should follow the principles of convenience, adaptability, and economy. In urban public areas, it is necessary to combine the layout of infrastructure such as parking lots and roads, and allocate them reasonably in commercial areas, residential areas, transportation hubs, and other places. In the community, it is necessary to consider factors such as parking space distribution and electricity load, and choose locations that are convenient for residents to charge. Highways should be set up in conjunction with service areas to ensure the charging needs of vehicles during long-distance travel. We also need to fully consider the ownership and growth trend of new energy vehicles, as well as the carrying capacity of the power grid, to achieve planning, avoid resource waste, and ensure that the charging needs of users in different scenarios can be met.

4.3 Operation and Management of Charging Stations

There are various operating modes for charging stations, including independent operation by operators and third-party cooperative operation. In terms of management, to ensure the normal operation of charging stations, regular inspections and maintenance are necessary to promptly detect and repair faults. We also need to optimize charging services by providing convenient payment methods, real-time charging status queries, and other functions. Through big data analysis, reasonable scheduling of charging resources can be achieved to improve the utilization rate of charging stations. In terms of electricity pricing, tiered pricing can be implemented based on factors such as time periods and electricity consumption, which not only ensures operator revenue, but also reduces user charging costs and improves the overall quality and efficiency of charging services.

5、 Implementation of a fully closed-loop system for power generation, storage, and consumption

5.1 Technical connection of each link

In the one-stop new energy solution for photovoltaic power generation, energy storage, and charging stations, technological integration is crucial. The photovoltaic power generation system converts direct current into alternating current through inverters and other equipment, which is used by users or stored in energy storage systems. The energy storage system adopts technologies such as battery management system (BMS) to control the charging and discharging of batteries and achieve energy interaction with the photovoltaic power generation system. When the user needs electricity, the charging station is connected to the energy storage system through a communication protocol to obtain electrical energy and charge it. The intelligent control system runs through the entire process, collecting and analyzing data from various links to achieve optimized energy scheduling and ensure efficient and stable operation of the entire system.

5.2 Fully closed-loop operation mode

The one-stop new energy solution can adopt multiple operation modes, such as self built and self operated by enterprises, third-party investment and operation, etc. In terms of profitability, electricity revenue can be obtained by selling green electricity, arbitrage can be carried out by using the peak valley electricity price difference, and compensation can be obtained by participating in auxiliary services in the electricity market. We can also provide energy management services, charge service fees to reduce electricity costs for users, conduct carbon trading, and convert the reduced carbon emissions into economic benefits. Through these methods, we can achieve a win-win situation between efficient energy utilization and economic benefits, and promote the sustainable development of the new energy industry.

5.3 Benefit analysis of fully closed-loop system

From an economic perspective, a fully closed-loop system can reduce energy transmission losses, improve energy utilization efficiency, and save electricity costs for users. Enterprises can increase revenue through diversified profit models. In terms of environmental benefits, reducing fossil energy consumption and lowering greenhouse gas emissions such as carbon dioxide can help improve environmental quality. In terms of social benefits, we will promote the development of the new energy industry, facilitate the transformation of the energy structure, provide new impetus for economic growth, drive the upgrading of related industries, create employment opportunities, enhance society's awareness and acceptance of green energy, and help achieve sustainable development goals.