Summary of DC power cabinet industry knowledge

As the core power supply equipment for key infrastructure such as power systems, communication base stations, rail transit, and data centers, DC power cabinets assume the important function of providing stable DC power for control loads, power loads, and emergency lighting. In the context of accelerating smart grid construction, this equipment has evolved from a single power supply device into a comprehensive management system integrating energy conversion, energy storage buffering and intelligent control. Its core architecture usually includes an AC input unit, a high-frequency switching charging module, a battery pack and a monitoring unit, which can ensure that an uninterrupted power supply is maintained even under power grid failures or extreme environments, and ensure the reliable operation of high-voltage circuit breaker opening and closing, relay protection and automation devices.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

It adopts the unique modular design of a switching power supply and N+1 hot backup. It has an ultra-wide voltage input range and strong grid applicability, and can be used in places with relatively harsh environments. The charging module can be plugged in and out when powered, and can be maintained online, which is convenient and fast. Hardware low-difference independent current sharing technology, the maximum imbalance of output current between modules is less than ±3%. The metal electrical cabinet system design adopts international standards such as IEC and UL, ensuring reliability and safety. The monitoring module adopts a large-screen LCD Chinese character display or touch screen with audible and visual alarms. The parameters of each part of the system can be set through the monitoring module, with a friendly interface and easy operation.

 

The outdoor waterproof electrical cabinet has advanced functions such as smooth adjustment of output voltage and current, automatic battery temperature compensation, etc. The open interface design has powerful communication functions and can be easily connected to the substation RTU device or the power plant computer monitoring system DCS. The three-level distributed monitoring system realizes telemetry, remote control, remote signaling, remote adjustment and unattended operation of the power system. Automatic solar battery cabinet management and protection, real-time automatic monitoring of battery terminal voltage, charge and discharge current, and control of battery equalization and float charging. It is equipped with battery over/under voltage and charging overcurrent audible and visual alarms. DC power panels are mainly used in substations, switching stations and user substations of 110kV and below.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The outdoor electrical cabinets adopt high-frequency switching power supply technology, which has replaced traditional silicon rectifier and thyristor rectifier equipment. It has the characteristics of high efficiency, small size, and high precision of current and voltage stabilization. Modern high-frequency soft-switching charging modules use technologies such as LLC resonance, and the conversion efficiency can reach more than 93%. The equipment adopts a modular design and supports N+1 hot backup and hot-swap technology to facilitate system expansion and online maintenance. The intelligent monitoring system realizes the four remote functions of telemetry, remote control, remote signaling and remote adjustment through RS232/RS485, CAN bus or Ethernet, and can be connected to remote monitoring systems such as SCADA.

 

The system is equipped with battery management technology, and the monitoring can automatically compensate and manage the battery voltage, charge and discharge current, and battery temperature to extend the service life of the battery. The new generation system is equipped with AI diagnostic function, which can predict the remaining life by analyzing battery parameters, realizing the transition from regular inspection to condition maintenance. In terms of safety and reliability, the DC power cabinet adopts reliable lightning protection and high-level insulation protection measures, and gradually adds advanced protection functions such as battery thermal runaway warning and insulation status trend analysis. For applications requiring high-density energy storage, the integration solution of a lithium-ion battery cabinet and solar battery cabinet is becoming an important technical direction.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In the field of smart substations, DC power cabinets, as the "heart-level equipment" of the system, need to have extremely high reliability and anti-interference capabilities to provide stable DC operating power and control power for relay protection devices and circuit breaker operating mechanisms. The data center's requirements for power supply cabinets focus on output stability and a high energy efficiency ratio. The output ripple coefficient can be controlled within 0.2%, providing pure and stable DC power for server clusters. In the field of new energy, electrical storage cabinets are linked with photovoltaic inverters to realize integrated operation of photovoltaic storage and charging, improve energy utilization efficiency, and become a key node connecting renewable energy generation and the power grid.

 

Communication base stations are an important application scenario for DC power supply cabinets. 48V DC power supply systems are widely used to power base station equipment to ensure continuous, smooth communication of the communication network. In addition, DC power cabinets are also widely used in rail transit, industrial and mining enterprises, high-rise buildings, electric vehicle charging stations, smart grids and other fields. In response to the demand for distributed energy storage, the configuration solutions of electrical storage cabinet and solar battery cabinet are gradually becoming popular.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Our company has been deeply involved in the field of 650 watt power supply for many years, focusing on the research and development and manufacturing of high-performance series products, comprehensively covering all types of power supply and distribution needs from substations to data centers, from communication base stations to new energy stations. We welcome calls and letters from partners from all over the world to jointly promote the intelligent upgrade and safe and reliable operation of power DC systems.