Shanghai Wenlida Power Electronics Photovoltaic-Storage-DC-Flexible System - Power Solution for Smart Buildings
I. Introduction
In the context of the global initiative to promote energy conservation, emission reduction, and address climate change, the construction industry, as a key field of energy consumption, is in urgent need of green transformation. Relying on its profound accumulation in the field of power technology, Shanghai Wenlida Power Electronics has launched an advanced Photovoltaic-Storage-DC-Flexible system, providing an innovative power solution for smart buildings, and helping buildings achieve efficient energy conservation, low-carbon environmental protection, and intelligent power management.
II. Analysis of Core Technologies of the Photovoltaic-Storage-DC-Flexible System
(1) "Photovoltaic" - Efficient Photovoltaic Power Generation
Shanghai Wenlida adopts high-performance photovoltaic modules, such as advanced monocrystalline or polycrystalline silicon solar panels, which have high photoelectric conversion efficiency and can maximize the conversion of solar energy into electricity. For example, photovoltaic modules can be reasonably laid on building surfaces such as rooftops and facades. Like the rooftops of some large commercial buildings, large-area photovoltaic arrays can be laid to make full use of solar energy resources. At the same time, intelligent photovoltaic tracking technology is used to adjust the angle of photovoltaic panels in real-time to track the position of the sun, thereby increasing photovoltaic power generation. Compared with fixed-angle photovoltaic panels, the power generation can be increased by [X]%.
(2) "Storage" - Reliable Energy Storage Guarantee
High-energy-density and long-life electrochemical energy storage batteries, such as lithium iron phosphate batteries, are configured. The energy storage system has intelligent management functions. During the low electricity consumption period, it uses low-price electricity or surplus photovoltaic power generation for charging and storage; during peak electricity consumption or insufficient photovoltaic power generation, it releases the stored electricity to ensure the stable power supply of the building. Taking an office building as an example, the energy storage system can meet its additional power demand for [X] hours during peak electricity consumption, effectively alleviating the pressure on the power grid and reducing electricity costs. At the same time, through an accurate Battery Management System (BMS), parameters such as voltage, current, and temperature of the battery are monitored in real-time to ensure the safe and efficient operation of the battery and extend its service life.
(3) "DC" - Advantages of DC Power Distribution
A low-voltage DC power distribution architecture is built. Compared with traditional AC power distribution, DC power distribution reduces AC-DC conversion links, lowers energy loss, and improves power transmission efficiency. In terms of DC voltage level selection, according to the power demand of different equipment in the building, for example, DC 750V is used as the main bus voltage. DC/DC converters are used to step down the voltage to DC 220V for small and medium-power equipment such as lighting and small electrical appliances. For high-power equipment such as air conditioners and charging piles, higher voltage levels are used. The DC power distribution system also has the characteristics of simple structure and convenient control, which can quickly respond to changes in power demand and achieve more accurate power distribution.
(4) "Flexible" - Flexible Electricity Consumption Regulation
Using an advanced intelligent control system, the power supply and demand situation in the building and the fluctuation of photovoltaic power generation are monitored in real-time. According to the characteristics of clean energy power generation, the internal power load of the building is dynamically adjusted, such as the intelligent control of adjustable lighting systems and air conditioning systems. When the photovoltaic power generation is sufficient, the power of these equipment is increased; when the power generation is insufficient, the power of non-critical equipment is automatically reduced or temporarily turned off to achieve real-time coordination and matching of source and load, improve energy utilization efficiency, and reduce dependence on and impact on the power grid.
III. System Architecture and Key Equipment
(1) System Architecture
Shanghai Wenlida's Photovoltaic-Storage-DC-Flexible system adopts a hierarchical and distributed architecture with DC bus as the core. The bottom layer is the on-site equipment layer, including various photovoltaic modules, energy storage battery packs, DC electrical equipment, and sensors, which are responsible for power generation, storage, use, and data collection; the middle layer is the communication and control layer. Through intelligent electric meters, data collectors, and other equipment, the data of on-site equipment is transmitted to the upper control system, and control instructions are received to realize the regulation of the underlying equipment; the top layer is the Energy Management System (EMS), which serves as the "brain" of the system, integrating the full amount of data of "source-grid-load-storage", and performing functions such as panoramic operation monitoring, multi-source power prediction, carbon emission monitoring and traceability, and intelligent optimal scheduling.
(2) Key Equipment
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Photovoltaic Modules: High-efficiency and high-reliability brand photovoltaic panels are selected, which have good low-light performance and anti-environmental interference ability, ensuring stable power generation under different lighting conditions.
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Energy Storage Battery System: In addition to high-quality lithium iron phosphate batteries, an advanced battery management system is equipped to accurately control the charging and discharging process of the battery, ensure the consistency and safety of the battery pack, and extend the service life of the battery.
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DC/DC Converters: High-performance power electronic converters are used, which have high conversion efficiency and high-precision voltage regulation capability to ensure stable power conversion between different voltage levels.
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Intelligent Electric Meters and Sensors: Real-time collection of power parameters, equipment status, and other data provides accurate data support for the energy management system and realizes refined management of the system.
IV. Application Scenarios in Smart Buildings
(1) Commercial Complexes
In large commercial complexes, the Photovoltaic-Storage-DC-Flexible system can meet the power demand of many shops, lighting, air conditioning, and other equipment. During the day, photovoltaic modules generate electricity for priority internal use, and surplus electricity is stored in the energy storage system; at night or during peak electricity consumption, the energy storage system discharges for supplementation. At the same time, through flexible electricity consumption regulation, the power of lighting and air conditioning systems is intelligently adjusted according to the passenger flow and business hours in different areas, reducing operating costs and improving energy utilization efficiency. For example, during some holidays or promotional activities, the lighting brightness and air conditioning temperature can be dynamically adjusted according to the density of people in the shopping mall to achieve a balance between energy conservation and comfort.
(2) Office Buildings
Office buildings usually have stable office power demand. The Photovoltaic-Storage-DC-Flexible system can use rooftop and facade photovoltaic power generation, and the energy storage system ensures stable power during office hours, avoiding office interruptions caused by power grid fluctuations. For some office buildings equipped with data centers, which have large power demand and high requirements for power supply stability, the Photovoltaic-Storage-DC-Flexible system can effectively smooth power fluctuations and ensure the reliable operation of data centers. Through flexible electricity consumption management, the power of non-essential equipment is automatically reduced after work to further save energy.
(3) Residential Communities
In residential communities, the Photovoltaic-Storage-DC-Flexible system can be applied to public area lighting, electric vehicle charging piles, and other facilities. Photovoltaic modules are installed on the roofs of public buildings or the tops of carports in the community, and the generated electricity is used for public lighting and residents' electric vehicle charging, while the energy storage system balances the peak and valley of electricity consumption. At the same time, residents are encouraged to participate in demand response. When there is surplus photovoltaic power generation in the community, residents can use the surplus electricity to charge household energy storage equipment or use high-power electrical appliances; when the power supply is tight, non-essential electricity consumption is automatically reduced to achieve optimal distribution and sharing of electricity in the community.
V. Comprehensive Benefit Analysis
(1) Economic Benefits
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Reduction of Electricity Costs: Through self-generation and self-use of photovoltaic power, the purchase of electricity from the power grid is reduced, and electricity expenses are saved. Using the peak-valley electricity price difference, the energy storage system charges during the low-valley electricity price period and discharges during the peak period to further reduce electricity costs. For example, after applying the Photovoltaic-Storage-DC-Flexible system, the annual electricity expense of a commercial building is reduced by [X]%.
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Reduction of Power Facility Investment: The application of the Photovoltaic-Storage-DC-Flexible system can reduce or delay the need for capacity expansion and transformation of the distribution network, and reduce the initial investment cost of power facilities. For example, in some newly built residential communities, after adopting this system, the capacity configuration of transformers and other power equipment is reduced, saving investment funds.
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Power Generation Income: For buildings with surplus photovoltaic power generation, the surplus electricity can be sold online to obtain power generation income and increase additional sources of income.
(2) Environmental Benefits
Taking a Photovoltaic-Storage-DC-Flexible system equipped with 100kWp photovoltaic as an example, it can generate about 120,000 kWh of electricity annually, which is equivalent to saving 42 tons of standard coal, reducing carbon dioxide emissions by 120 tons, and carbon dust by 32 tons. It significantly reduces the carbon emissions of buildings, helps achieve the "dual carbon" goal, and makes positive contributions to environmental protection. At the same time, it reduces dependence on traditional fossil energy and reduces the environmental impact during energy extraction and transportation.
(3) Social Benefits
It promotes the development of the construction industry towards green, low-carbon, and intelligent directions, and enhances the overall image and competitiveness of the city. It promotes the development of related industries such as new energy industry and power electronics technology, creating more employment opportunities and economic growth points. It improves the energy-saving awareness of residents and enterprises, forms a good social demonstration effect, and promotes the sustainable development of the whole society.
VI. Conclusion
Shanghai Wenlida Power Electronics' Photovoltaic-Storage-DC-Flexible system provides a comprehensive, efficient, and reliable power solution for smart buildings. By integrating advanced power technologies, it realizes the optimal utilization, efficient management, and low-carbon emission of energy. In the current era of energy transformation and green development, this system has broad application prospects and promotion value, which will inject strong impetus into the sustainable development of the construction industry and help build a more green, intelligent, and livable future city.
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