DC power router, three-port energy routing device, photovoltaic energy storage intelligent microgrid equipment

DC Power Router

• Working Principle: It mainly includes two processes: current conversion and inversion. During current conversion, the input DC power is processed, which may involve rectification, i.e., using components such as diodes to convert AC signals into unidirectional DC signals. The inversion process uses an inverter to convert DC power into AC power, changing the direction and magnitude of the current by controlling the on and off of the switching tubes.
• Components
  • Rectifier Circuit: Composed of diodes and other components, it is used to convert the input AC signal into a DC signal, and the current stability and waveform quality need to be considered.
  • Inverter Circuit: Composed of an inverter, it controls the on and off of the switching tubes according to the equipment requirements to realize the conversion from DC power to AC power.
  • Control Circuit: It is used to control and adjust the rectification and inversion processes, and can control parameters such as the output current, voltage, and frequency of the DC power router.
• Advantages and Features
  • High Efficiency: Adopting advanced technologies and strategies to achieve efficient conversion and transmission of electrical energy. Compared with traditional AC power grids, DC power grids have lower energy transmission losses.
  • Reliability: It has good fault tolerance and self-recovery capabilities, can quickly detect and respond to faults, and ensure the stable operation of the power grid.
  • Flexibility: It can be flexibly configured and expanded according to needs, supporting the access of equipment with multiple voltage levels and power capacities.
  • Intelligence: Integrating advanced control algorithms and communication technologies to realize intelligent scheduling and management of the power system, and automatically adjust power distribution and transmission.

Three-Port Energy Routing Device

• Function and Role: It is usually used to connect photovoltaic power sources, batteries, DC microgrids, etc. It can effectively improve the power density of power converters, reduce the number of components, and realize the free flow of electrical energy between the three ports of light, storage, and grid. It can solve the problem of power mismatch between the power source and the load end caused by photovoltaic power generation being affected by environmental factors, and maintain the stability of the power grid.
• Control Optimization: Through targeted control optimization under different working modes, such as ensuring the maximum power point operation of solar cells, all power tubes can achieve soft switching in the full power range, reducing switching losses, and at the same time minimizing current circulation to reduce conduction losses and improve efficiency. The verification results of the experimental prototype show that some optimization methods can make the device achieve a high peak conversion efficiency, such as 98.5%.

Photovoltaic Energy Storage Smart Microgrid Equipment

• System Architecture
  • DC Bus Architecture: Adopting multi-voltage level DC buses, such as ±375V low-voltage DC, 1500V medium-voltage DC, etc., it is compatible with direct access of photovoltaic, energy storage, and DC loads, supports modular expansion of "photovoltaic-storage-direct-flexible" units, and can build low-voltage DC microgrid groups or AC-DC hybrid microgrids.
  • Key Equipment: Photovoltaics are directly integrated into the DC bus through DC/DC converters; the energy storage bidirectional interface supports flexible access of various types of energy storage; the flexible power router integrates multi-port power electronic converters to dynamically adjust energy flow direction and voltage levels; smart terminals include DC air conditioners, LED lighting, electric vehicle charging piles and other DC loads, reducing AC-DC conversion losses.
• Technical Advantages
  • High Energy Conversion Efficiency: The DC direct supply efficiency can reach 95%-98%, which is higher than that of traditional AC microgrids with multiple AC/DC conversions.
  • Strong Stability: There is no frequency problem, and energy storage plus virtual inertia can enhance anti-interference performance.
  • Reduced Equipment Cost: Eliminating some power electronic equipment, the cost is reduced by 10%-15%.
  • Good Regulation Flexibility: Adopting distributed flexible control, supporting "plug and play".