Control power for electrical systems must be safe and reliable. In electrical engineering, control power is divided into two categories: direct current (DC) power and alternating current (AC) power. The DC power system that supplies power to control, signal, protection, automatic devices, and certain actuating mechanisms in substation is commonly referred to as DC operating power. The AC uninterruptible power supply system that powers equipment such as computer monitoring is typically called AC control power; the DC power system that supplies power to communication equipment like switches and remote control is known as communication power.
1. Difficulty in maintenance: Currently operating substation control power equipment generally adopts an independent and decentralized setup, supplied by different vendors and managed by various departments: Relay Protection is responsible for the maintenance of DC operation power supply, Automation for AC control power supply, and Remote Control Communication for communication power supply. This not only leads to redundant functional configurations and increased initial equipment investment but also results in high operational and maintenance costs due to different maintenance interfaces across specialties. Additionally, the lack of unified interface specifications and monitoring equipment for AC and DC control power supply products from different suppliers hinders data sharing and makes it challenging to perform systematic analysis, maintenance, and integrated information management for the entire system. Since different manufacturers produce power systems, when a power failure occurs or maintenance is needed, service personnel from multiple suppliers must be dispatched to the site, taking several hours to days to arrive. This prolongs work duration, affects equipment power supply, and poses the same issue for patrol personnel. 36V aviation power supply, 400HZ frequency conversion power supply, 115/200V power supply, 27V DC power supply, 400HZ power supply, aviation power supply
2. Poor cost-performance ratio; using traditional power systems would result in separate battery configurations for DC power, UPS uninterruptible power supply, and communication power, supplied by different manufacturers. AC power is typically from another vendor, and the AC system includes automatic power switching equipment, with redundant charging modules, leading to waste and difficulty in coordinating equipment operations. Additionally, considering the increased number of spare parts for the equipment and the various manufacturers, the waste is significant.
3. Despite all equipment in the substation adhering to the IEC61850 protocol to resolve compatibility issues with communication protocols, the lack of a unified monitoring system to manage the entire station's power supply prevents the realization of system data sharing and hinders advanced applications such as coordinated operation and condition-based maintenance.
