CN204465138U - An AC-DC integrated power supply system - Google Patents

Abstract

The utility model relates to transformer station's power supply unit technical field, is specifically related to a kind of AC/DC integrated power-supply system.Arrange the problems such as dispersion for the repeated configuration batteries existed in prior art and power supply and watch-dog thereof, of the present utility modelly propose a kind of AC/DC integrated power-supply system.AC/DC integrated power-supply system of the present utility model comprises direct current operative power source DC, ac uninterrupted power supply UPS and centralized monitor module.The direct-flow input end of ac uninterrupted power supply UPS connects the batteries of direct current operative power source DC, and the direct-current supervision module in direct current operative power source DC and the UPS monitoring module in ac uninterrupted power supply UPS connect the input of centralized monitor module.The utility model is applicable to different transformer stations and powers occasion, and power supply performance is reliable and stable, has larger application and promotes space.

Description

An AC-DC integrated power supply system

technical field

The utility model relates to the technical field of substation power supply equipment, in particular to an AC-DC integrated power supply system.

Background technique

At present, substations are generally equipped with three sets of independent operating power systems, namely DC operating power supply DC, DC conversion power supply DC/DC, and AC uninterruptible power supply UPS. Each power system is equipped with a separate battery room, battery pack and monitoring management system. The DC power supply system that supplies power for control, signal, protection, automatic devices, and some actuators, etc., is usually called a DC operating power supply. The AC power system that supplies power for microcomputers, carriers, fire-fighting and other equipment is usually called AC operating power; the DC power system that supplies power for communication equipment such as switches and telecontrols is called DC conversion power supply DC/DC, also known as communication power supply.

DC operating power supply DC is a power supply that can maintain reliable power supply to all control, protection, automatic devices and other control loads in the substation and various DC motors, circuit breaker closing mechanisms and other equipment in the normal or emergency state of the station AC power supply. The DC system voltage of the DC operating power supply is generally 220 V or 110 V, and the ungrounded method is adopted. For substations of 220KV and above, two sets of storage batteries and two sets of charging devices are installed to form a mode of two batteries and two charging devices. in different busbar sections. Since the 1990s, the intelligent high-frequency switching power supply technology has matured, and realized modularization and parallel hot backup operation. The battery pack adopts maintenance-free valve-regulated lead-acid batteries, and adopts distributed computer and field bus technology to control the DC power supply system. Centralized monitoring has improved the intelligent management level and maintenance convenience of the charging module, and the reliability and technical level of the system operation have achieved a qualitative leap. At present, it has completely replaced the phase-controlled power supply in substations and is widely used.

DC conversion power supply DC/DC, also known as communication power supply, is the power supply for communication equipment such as carrier machine and optical transceiver in the substation and protection multiplexing equipment. The system voltage of the communication power supply is 48V, and the positive pole is grounded. 220 KV and above substations are designed according to the design of two electric and two charging, using a single busbar connection, two sets of storage batteries and two sets of charging devices are respectively connected to different busbar sections, and there is no connecting device between the two sections of busbars.

AC uninterruptible power supply UPS supplies power for computer monitoring equipment that does not allow short-term power outages in substations, and requires high reliability and stability. AC uninterruptible power supply UPS generally adopts a series operation mode of one use and one standby, that is, the main machine supplies power during normal times, and the slave machine automatically switches on when the main machine fails. The AC uninterruptible power supply UPS is powered by the AC power supply under normal conditions. When the AC power supply disappears or the rectifier, inverter and other components fail, the built-in battery supplies power to the load through the inverter. Since the mid-1990s, AC uninterruptible power supply UPS has been widely used in substations. Due to the small capacity of its built-in battery pack and no professional maintenance measures, it has become a potential uncertain factor that threatens the stable operation of substations.

There are the following problems in configuring three sets of independent operating power sources in the substation: 1. It is impossible to comprehensively optimize resources, and the independent operating power systems are repeatedly configured with battery packs, which increases the primary investment. 2. Decentralized equipment increases the daily operation and maintenance work. 3. Due to the differences in technical standards of different suppliers of operating power sources, it is difficult to coordinate power supply installation and service.

Utility model content

Aiming at the problems existing in the prior art, such as repeated configuration of storage battery packs, power supplies and scattered distribution of monitoring equipment, the utility model proposes an AC-DC integrated power supply system.

The technical scheme of the utility model is:

An AC-DC integrated power supply system includes a DC operating power supply DC, an AC uninterruptible power supply UPS and a centralized monitoring module. The DC input terminal of the AC uninterruptible power supply UPS is connected to the battery pack of the DC operating power supply DC, and the DC monitoring module in the DC operating power supply DC and the UPS monitoring module in the AC uninterruptible power supply UPS are connected to the input terminal of the centralized monitoring module.

Specifically, the AC-DC integrated power supply system also includes DC conversion power supply DC/DC, the DC input terminal of the DC conversion power supply DC/DC is connected to the battery pack of the DC operating power supply DC, and the communication monitoring module in the DC conversion power supply DC/DC is connected to the centralized The input terminal of the monitoring module.

Beneficial effects of the utility model: the AC-DC integrated power supply system established according to the technical scheme of the utility model will provide three types of power supplies required for substation operation (DC operating power supply DC, AC uninterruptible power supply UPS and DC conversion power supply DC/DC) Integrated into one, the battery packs of the three types of power supply all use the battery packs of the DC operating power supply, and the number of the battery packs is reduced from three to one, avoiding the repeated configuration of the battery packs, and saving the one-time investment in the construction of the power supply system. The three types of power supply use a unified centralized monitoring module to realize centralized processing and analysis of information, which is conducive to improving work efficiency. The AC-DC integrated power supply system can be mainly used in power grids, power generation and other fields, and can be used as various power automation systems, communication systems, remote execution systems, opening and closing of high-voltage circuit breakers, relay protection, automatic devices, signal devices, etc. in substations. AC and DC uninterruptible power supply. The utility model is suitable for different substation power supply occasions, has stable and reliable power supply performance, and has large application and popularization space.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the structural representation of embodiment 2.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Example 1

Referring to Figure 1, Embodiment 1 includes a DC operating power supply DC, an AC uninterruptible power supply UPS and a centralized monitoring module. The DC input terminal of the AC uninterruptible power supply UPS is connected to the battery pack of the DC operating power supply DC, and the DC monitoring module in the DC operating power supply DC and the UPS monitoring module in the AC uninterruptible power supply UPS are connected to the input terminal of the centralized monitoring module. The AC input terminal of the DC operating power supply DC and the AC uninterruptible power supply UPS is externally connected to the AC power supply system. The main wiring of the AC power supply system adopts a single busbar without segmented wiring. It is composed of function table, feeder circuit breaker and switching value acquisition unit. The battery pack of the DC operating power supply is a 100AH/12V valve-regulated lead-acid battery. Both DC operating power supply DC and AC uninterruptible power supply UPS communicate with the centralized monitoring module through their respective RS485 communication interfaces.

Example 2

Referring to Fig. 2, Embodiment 2 includes a DC operating power supply DC, an AC uninterruptible power supply UPS, a DC conversion power supply DC/DC and a centralized monitoring module. The DC input terminals of the AC uninterruptible power supply UPS and the DC conversion power supply DC/DC are respectively connected to the battery pack of the DC operating power supply DC, the DC monitoring module in the DC operating power supply DC, the UPS monitoring module in the AC uninterruptible power supply UPS, and the DC conversion power supply The communication monitoring module in the DC/DC is connected to the input end of the centralized monitoring module. The AC input terminal of the DC operating power supply DC and the AC uninterruptible power supply UPS is externally connected to the AC power supply system. The main wiring of the AC power supply system adopts a single busbar without segmented wiring. It is composed of function table, feeder circuit breaker and switching value acquisition unit. The battery pack of the DC operating power supply is a 100AH/12V valve-regulated lead-acid battery. DC operating power supply DC, AC uninterruptible power supply UPS and DC conversion power supply DC/DC all communicate with the centralized monitoring module through their respective RS485 communication interfaces.

The above-mentioned implementations are only preferred embodiments of the present utility model, rather than an exhaustive list of feasible implementations of the present utility model. For those skilled in the art, any obvious changes made without departing from the principle and spirit of the utility model should be considered to be included in the protection scope of the claims of the utility model.

Claims (2)

1. An AC-DC integrated power supply system is characterized in that it comprises a DC operating power supply DC, an AC uninterruptible power supply UPS and a centralized monitoring module, and the DC input terminal of the AC uninterruptible power supply UPS is connected to the battery pack of the DC operating power supply DC The DC monitoring module in the DC operating power supply DC and the UPS monitoring module in the AC uninterruptible power supply UPS are connected to the input end of the centralized monitoring module. 2. An AC-DC integrated power supply system according to claim 1, characterized in that it includes a DC conversion power supply DC/DC, the DC input terminal of the DC conversion power supply DC/DC is connected to a battery pack of a DC operating power supply DC, The communication monitoring module in the DC conversion power supply DC/DC is connected to the input end of the centralized monitoring module.