Photovoltaic, Energy Storage, DC power supply and Flexible load system

I. System Composition and Working Principle

1. Photovoltaic Power Generation: Using solar photovoltaic technology, solar energy is converted into direct current (DC) electricity. In the construction field, photovoltaic products can be directly used as building materials, such as photovoltaic tiles and photovoltaic walls, which are perfectly integrated with buildings to achieve green power generation.
2. Energy Storage Technology: It includes various forms such as electrochemical energy storage, domestic hot water energy storage, and thermal inertia energy storage of building envelopes. Energy storage devices are used to store excess electricity generated by photovoltaic power generation and release it when the sunlight is insufficient or during peak power demand periods to balance the power supply and demand.
3. DC Power Distribution: A low-voltage DC power distribution system is adopted. DC devices are directly connected to the building's DC bus, and then connected to the external power grid through an AC/DC bidirectional converter. The DC power distribution technology reduces energy loss and improves the efficiency of power transmission.
4. Flexible Interaction: Through intelligent control technology, elastic adjustment of the building's energy demand from the outside world is achieved. Under the condition of meeting normal use, the flexible interaction technology can flexibly adjust the building's electricity load according to the supply situation of renewable energy to cope with the uncertainty of renewable energy supply.

II. System Advantages

1. High Efficiency and Cleanliness: Using renewable energy significantly reduces carbon emissions and has the ability to supply high-efficiency and clean energy.
2. Reliability and Stability: Through the application of energy storage technology, the contradiction between power supply and demand is solved, and the stability and reliability of the power system are improved.
3. Loss Reduction: The DC power distribution technology reduces the energy loss during the conversion and transmission processes and improves the power transmission efficiency.
4. Optimal Dispatching: The flexible interaction technology can flexibly adjust the electricity load according to the actual situation, optimize power dispatching, and improve the flexibility and controllability of the power system.

III. Application Scenarios

• Household Field: It provides green and reliable power supply for households and reduces household electricity costs.
• Industrial Field: It provides stable and efficient power support for factories, workshops, etc., and ensures the normal operation of production equipment.
• Commercial Field: It provides high-quality power services for shopping malls, hotels, etc., and enhances the customer experience and commercial value.

IV. Development Trends

1. Technological Innovation: Continuously innovate in photovoltaic power generation, energy storage technology, DC power distribution, and flexible interaction to improve the overall performance and efficiency of the system.
2. System Integration: Promote the deep integration of the PEDF system with technologies such as building intelligence and the Internet of Things to achieve intelligent management and control of the system.
3. Policy Promotion: With the global emphasis on the carbon neutrality goal, governments around the world will introduce more policies to support and promote the application and development of the PEDF system.
4. Market Popularization: With the reduction of costs and the improvement of performance, the PEDF system will gradually enter the stage of market popularization, bringing green and efficient power solutions to more users.