CN202034819U - Uninterruptible power supply system based on fuel cell - Google Patents

Abstract

The utility model discloses an uninterruptible power supply system based on a fuel cell. The power supply system includes a main circuit power supply unit composed of a rectifier device, an inverter and an inverter static switch connected in sequence, and a bypass static switch. Bypass power supply unit, backup power supply unit composed of auxiliary power supply device, DC/DC, fuel cell system, and control system for monitoring the working status of the above units; one end of the bypass static switch is the mains input end, and the other end is the AC power supply Output terminal; one end of the rectifier device is the mains input terminal, and the other end outputs AC power after the inverter and inverter static switch; the output terminal of the auxiliary power supply device and the fuel cell system are connected to the input terminal of the inverter after DC/DC . The utility model can provide long-term and stable electric power supply under the condition that the mains power supply is cut off.

Description

Uninterruptible power supply system based on fuel cell

technical field

The utility model relates to a power supply system, in particular to an uninterruptible power supply system using fuel cell technology. the

Background technique

As a continuous, stable and uninterrupted power supply equipment, UPS (uninterruptible power supply) is widely used in the communication industry and industrial fields, especially in environments with demanding power requirements such as key equipment and network centers, its importance is particularly prominent. the

In order to ensure that the system can provide continuous power supply when the external mains power is cut off, there must be an energy storage device in the UPS system. In the current UPS system, a large-scale lead-acid battery pack is generally used. However, the inherent defects of the battery limit the performance of the UPS, such as its large weight, large footprint, and high manual maintenance requirements. In the event of a mains power outage, the limitation of its sustainable power supply time is difficult to overcome, and it has also become a UPS application. a bottleneck. the

Utility model content

Due to the above-mentioned problems in the prior art, the purpose of this utility model is to propose a fuel cell-based uninterruptible power supply system, which is clean and efficient, and can provide long-term and stable power in the event of a mains power failure powered by. the

In order to achieve the above object, the utility model can be solved by the following technical solutions:

An uninterruptible power supply system based on fuel cells, including a main circuit power supply unit composed of sequentially connected rectifiers, inverters and inverter static switches, a bypass power supply unit composed of bypass static switches, and an auxiliary power supply unit device, DC/DC, fuel cell system, and a control system that monitors the working status of each of the above units; one end of the bypass static switch is the mains input end, and the other end is the AC output end; the rectifier One end of the device is the mains input end, and the other end outputs alternating current through the inverter and inverter static switch; the output end of the auxiliary power supply device and the fuel cell system are connected to the The input terminal of the inverter. the

As a further feature of the utility model, it also includes a man-machine interface connected to the control system, and the control system responds to commands of the man-machine interface in real time and feeds back the working status of each unit to the man-machine interface. the

As a further feature of the present utility model, the control system is connected to the auxiliary power supply device, and the auxiliary power supply device provides electric energy for it. the

Due to the adoption of the above technical scheme, the fuel cell-based uninterruptible power supply system of the present utility model can provide uninterrupted and stable power supply to the outside through the organic coordination of the main circuit power supply unit, bypass power supply unit and backup power supply unit. Important electrical equipment provides continuous high-quality electrical energy. Even if there is a mains power outage, as long as the hydrogen power supply of the fuel cell system is sufficient, the system can continue to work, which can overcome the problems of the limited continuous working time of the existing UPS system. the

Description of drawings

FIG. 1 is a schematic structural diagram of a fuel cell-based power supply system of the present invention. the

Detailed ways

The utility model will be further described below according to the accompanying drawings and specific embodiments:

As shown in Figure 1, a fuel cell-based uninterruptible power supply system of the present invention includes a main circuit power supply unit composed of a rectifier device 3, an inverter 4 and an inverter static switch 5 connected in sequence, and a bypass A bypass power supply unit composed of road static switch 2, a backup power supply unit composed of auxiliary power supply device 6, DC/DC 7, and fuel cell system 8; one end of bypass static switch 2 is the mains input end, and the other end is the AC output end ; One end of the rectification device 3 is the mains input end, and the other end outputs AC power after passing through the inverter 4 and the inverter static switch 5; the output end of the auxiliary power supply device 6 and the fuel cell system 8 are connected to the inverter after passing through DC/DC7 4; also includes a control system 1 connected to the man-machine interface 9, the control system 1 mainly monitors the working status of each functional unit, judges the input status of the mains power, switches the working mode, and responds to the commands of the man-machine interface in real time , and feed back the monitored working status to the man-machine interface 9; the control system 1 is connected to the auxiliary power supply device 6, and the auxiliary power supply device 6 provides electric energy for it. the

According to the power supply method realized by the uninterruptible power supply system based on fuel cell of the present utility model, comprises the following steps:

1) The control system 1 monitors the external mains power supply. When the external mains power supply is normal and each functional unit in the main circuit power supply unit is working normally, the main circuit power supply unit provides external power to form the main circuit power supply mode; at this time, the external mains power supply After being input to the rectifying device 3, it is rectified into DC electric energy, and the inverter 4 inverts the DC electric energy into stable AC electric energy, and provides electric energy to external electrical equipment after passing through the inverter static switch 5. At this time, the bypass power supply unit stops working, the bypass static switch 2 is in the off state, and the standby power supply unit is in the standby state;

2) When the external mains power supply is normal, but the control system 1 monitors that the power supply unit of the main circuit fails or receives the command of the man-machine interface 9 and needs manual maintenance, close the bypass static switch 2, and turn the rectifier 3 and inverter 4, the inverter static switch 5 is turned off, the control system 1 switches the power supply mode of the main circuit to the bypass power supply mode, and the external mains supply power directly to the outside after passing through the bypass static switch 2; The modules all stop working, and the backup power supply unit is in standby state;

3) When the control system 1 detects that the external mains power is cut off, the auxiliary power supply device 6 provides temporary DC power, which supplies power to the outside after passing through the inverter 4 and the inverter static switch 5, and at the same time, the control system 1 starts the fuel cell The system 8 enables it to output DC electric energy, and the DC electric energy is output externally after passing through DC/DC 7 , inverter 4 , and inverter static switch 5 . At this time, the backup power supply unit is in the running state and outputs AC electric energy externally. During the working process of the standby power supply unit, its continuous working time is mainly limited by the supply of hydrogen fuel. Therefore, as long as sufficient hydrogen supply is provided, the working time of the system is not limited, and it can provide long-term and stable power supply to the outside world. the

However, the above-mentioned specific implementations are only exemplary, and are for better understanding of this patent by those skilled in the art, and cannot be interpreted as limiting the scope of this patent; as long as any Equivalent changes or modifications all fall within the scope of this patent. the

Claims (3)

1. uninterrupted power supply electric power system based on fuel cell, it is characterized in that: the bypass power supply unit that comprises the main circuit power supply unit formed by the rectifying device, inverter and the inversion static switch that link to each other successively, forms by bypass static switch, the stand-by power supply unit of forming by auxiliary power supply, DC/DC, fuel cell system, and the control system of each cell operation state more than monitoring; One end of described bypass static switch is the mains electricity input end, and the other end is the alternating current output; One end of described rectifying device is the mains electricity input end, and the other end is output AC behind described inverter, inversion static switch; Described auxiliary power supply output and described fuel cell system are connected to the input of described inverter behind described DC/DC.

2. electric supply system according to claim 1 is characterized in that: also comprise the man-machine interface that links to each other with control system, the order of this man-machine interface of described control system real-time response also feeds back to this man-machine interface with the operating state of described each unit.

3. electric supply system according to claim 1 and 2 is characterized in that: described control system links to each other with described auxiliary power supply provides electric energy by this auxiliary power supply for it.