The power UPS and DC power supply systems together form the uninterruptible power supply for power plants and substation, providing electricity to microcomputers, communications, carriers, emergency lighting, and other equipment that cannot be powered down. By tapping into the existing DC power supply of the power plant or substation, there is no need for a separate battery bank like conventional UPS systems, thereby avoiding redundant investment in batteries, reducing system maintenance, and lowering operational costs.

The working principle and output characteristics of the electric power UPS are identical to those of traditional UPS systems. However, due to its connection to a DC operational power supply system, its DC input characteristics must meet the requirements of the power system. The electric power UPS is designed for power plants, substation, and other power industry applications. In power generation and power systems, core equipment such as DCS (Distributed Control System), monitoring systems, automation instruments, dispatch communication systems, and microcomputer systems have high demands for power quality and reliability, necessitating UPS power supply. The majority of these loads are single-phase.

A typical power UPS system is composed of three main parts: the power UPS host, the bypass voltage stabilizer cabinet, and the output distribution cabinet (these can be combined into one unit for low-power systems).

1. Power UPS Server Cabinet

Isolation Transformers, Rectifiers, Inverters, Static Bypass Switches, Bypass Switches, and Reverse Rectifiers

2. Bypass Isolation Voltage Stabilizer Cabinet

Bypass Isolation Transformers, Bypass Voltage Stabilizers, Manual/Bypass Maintenance Switches

Cable Tray Cabinet

Recirculation distribution units, monitoring instruments, control switches, and signal indicators, etc.

The power UPS power supply utilizes a 1+1 redundancy power supply system. Designed for power system applications, it features an industrial-grade AC protection power supply manufactured with advanced technology, fully meeting the reliability requirements of power DCS systems and other loads.

The power UPS is mainly composed of the following systems, utilizing two-stage conversion. The first stage conversion employs a rectifier (AC-DC) to convert the alternating current after passing through the input isolation transformer into stable direct current. The second stage conversion (DC-AC) uses an inverter power supply to transform the direct current output from the rectifier into a sine wave alternating current, which is then isolated and supplied to the load.

1. Isolation Segment

The input isolation transformer separates AC input from DC, safeguarding the DC side equipment; the output isolation transformer isolates both AC inputs and AC outputs, protecting the load-end equipment. The dual isolation ensures true and complete electrical isolation between the three ports: DC input, AC input, and AC output.

2. Rectifier section

The input AC power is converted to stable DC power and then supplied to the inverter equipment.

3. Inverter section

Converts external DC or rectified DC power into a stable sine wave AC power.

4. Control Segment

The inverter's power source follows the standard municipal power supply, maintaining the same phase and frequency. It automatically adjusts, ensuring the power remains within the specified range and operates or protects according to the set protection values.

5. Display Section

Our system utilizes LCD and LED status simulators to accurately reflect equipment operation status and fault information.

6. Transition Portions

Automatically switch between bypass, utility power, and inverter output using relays or static electronic switches.