Power supply system and parallel power supply system of UPS (Uninterrupted Power Supply) vehicle

Abstract

The invention discloses a power supply system and a parallel power supply system of a UPS (Uninterrupted Power Supply) power van, and belongs to the technical field of engineering machinery power van. The alternating current input end of the UPS is respectively connected to the diesel generator set and the mains supply through the dual-power change-over switch, the direct current end of the UPS is connected to the chassis battery through the isolation equipment, the output ground wire and the input ground wire of the isolation equipment are independently arranged, and the alternating current output end of the UPS is connected to the load end. The parallel power supply system comprises a plurality of UPS power supply vehicles, wherein each UPS power supply vehicle adopts the power supply system; the output end of the dual-power change-over switch in each power supply system is connected with the alternating current input ends of the UPSs in all the power supply systems; and the alternating current output ends of the UPSs in all the power supply systems are connected to a load end. The power supply system provided by the invention can effectively prolong the continuous discharge time of the power supply vehicle, and the parallel power supply system can realize continuous discharge without interruption under a pure power condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply vehicles of engineering machinery, and particularly relates to a power supply system and a parallel power supply system of a UPS power supply vehicle. BACKGROUND

[0002] The UPS (Uninterruptible Power Supply) power supply vehicle is a power supply vehicle provided with a UPS system. The energy storage battery on the vehicle can be used as a transition power source for starting a generator set or used for supplying power to a load alone, thereby effectively ensuring uninterrupted power supply at the load end. At present, the standard for the power supply vehicle stipulates that the energy of the chargeable energy storage system should not be greater than 120 kW·h. For large power consumption sites with high load power, the setting of the battery energy seriously affects the continuous power supply time.

[0003] With increasing emphasis on environmental protection, the power supply vehicle based on a new energy chassis will become a future development trend. The chassis power battery has sufficient power. How to use the energy stored in the chassis battery to supply power to the load and prolong the power supply time of the power supply vehicle has become a key problem in the research of the new energy UPS power supply vehicle. The existing safety standard for the battery of the new energy chassis stipulates that the battery should have an insulation monitoring function when working, and the system insulation resistance should satisfy ≥100Ω / V. At present, the battery insulation monitoring adopts the bridge balance method. When the method is used for detection, after the chassis battery is connected to the UPS system, the UPS itself will generate a parasitic capacitance when working, which will cause a false leakage current and interfere with the insulation monitoring result, resulting in unqualified insulation monitoring, the battery stopping power supply to the outside, and the system failing to work normally. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art and provide a power supply system and a parallel power supply system of a UPS power supply vehicle, thereby solving the technical problem that the capacity of the battery system of the UPS power supply vehicle is not higher than 120 kW·h due to the standard limitation, which seriously limits the continuous discharge time of the power supply vehicle.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: In a first aspect, the present application provides a power supply system of a UPS power supply vehicle, comprising: a UPS; an alternating current input end of the UPS is connected to a diesel generator set and a commercial power supply through a double power supply switch, respectively; a direct current end of the UPS is connected to a chassis battery through an isolation device; an output ground wire of the isolation device is independently arranged with an input ground wire; and an alternating current output end of the UPS is connected to a load end.

[0006] Optionally, the UPS includes a rectifier, an inverter, and a DC-DC converter; the input terminal of the rectifier is connected to the output terminal of the dual power transfer switch, the output terminal of the rectifier is connected to the input terminal of the inverter and one end of the DC-DC converter; the other end of the DC-DC converter is connected to one end of the isolation device; and the output terminal of the inverter is connected to the load terminal.

[0007] Optionally, an input switch is connected in series between the dual power supply switching switch and the rectifier, and an output switch is connected in series between the inverter and the load.

[0008] Optionally, a circuit breaker is also connected in series between the isolation device and the DC converter.

[0009] Optionally, the UPS, the dual power transfer switch, the diesel generator set, the isolation equipment, and the circuit breaker are installed in the upper compartment of the UPS power vehicle, and the chassis battery is installed on the drivable chassis of the UPS power vehicle, providing power for the drivable chassis to travel.

[0010] Optionally, the chassis battery is a swappable battery.

[0011] Optionally, the power supply system further includes an on-board controller, which is electrically connected to the load and the chassis battery respectively, and is used to detect the load power and battery charge.

[0012] Optionally, the power configuration of the UPS is as follows: ,in, Rated power at the load end, in kW; The power configuration of the isolation device is as follows: ; The chassis battery is configured with the following power ratings: ,in, For battery swapping time, This is for backup time; the unit of electricity consumption is kW·h.

[0013] Secondly, the present invention provides a parallel power supply system for UPS power supply vehicles, comprising multiple UPS power supply vehicles, each of which adopts the power supply system described above; the output terminal of the dual power transfer switch in each power supply system is connected to the AC input terminal of the UPS in all the power supply systems; and the AC output terminal of the UPS in all the power supply systems is connected to the load terminal.

[0014] Optionally, the power supply systems can exchange information via a bus.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This invention provides a power supply system and parallel power supply system for a UPS power supply vehicle. The chassis is driven by a power battery. The UPS power supply vehicle fully utilizes the large capacity of the chassis battery to power the load, extending the continuous discharge time of the power supply vehicle. At the same time, an isolation device is added between the chassis battery and the UPS. The output ground and input ground of the isolation device are completely independent, isolating the output circuit and the input side circuit. That is, the chassis battery is isolated from the circuit breaker and the UPS downstream. When the chassis battery is subjected to insulation monitoring, only the insulation resistance of the input side to ground is detected. The leakage current on the UPS side does not affect the insulation monitoring of the chassis battery, so that the insulation monitoring results meet the national standards and the chassis battery can work normally without losing power. Simultaneously, by utilizing the parallel connection of multiple power supply vehicles and the battery's ability to swap batteries, continuous and uninterrupted power supply to the load is achieved in battery-powered mode, realizing "silent" operation. Attached Figure Description

[0016] Figure 1 This is a structural block diagram of the power supply system of the UPS power supply vehicle provided in an embodiment of the present invention; Figure 2 This is a structural block diagram of the parallel power supply system of the UPS power supply vehicle provided in the embodiment of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0018] Example 1:

[0019] like Figure 1 As shown, this embodiment of the invention provides a power supply system for a UPS power vehicle, including: a UPS; the AC input terminal of the UPS is connected to a diesel generator and the mains power respectively through a dual power transfer switch; the DC terminal of the UPS is connected to the chassis battery through a circuit breaker and an isolation device; the output ground wire and input ground wire of the isolation device are independently set; and the AC output terminal of the UPS is connected to the load terminal. If the DC converter has an isolation function, the isolation device can also be omitted.

[0020] In this embodiment of the invention, the output ground and input ground of the isolation device are completely independent, which isolates the output side circuit and the input side circuit. That is, the chassis battery and the circuit breaker and the UPS behind it are isolated. When the chassis battery is performing insulation monitoring, only the insulation resistance of the input side to ground is detected. The leakage current on the UPS side does not affect the insulation monitoring of the chassis battery, so that the insulation monitoring results meet the national standard and the chassis battery can work normally without losing power.

[0021] A UPS includes an input switch, a rectifier, an inverter, a DC-DC converter, and an output switch. The input terminal of the rectifier is connected to the output terminal of a dual power transfer switch via the input switch. The output terminal of the rectifier is connected to the input terminal of the inverter and one end of the DC-DC converter. The other end of the DC-DC converter is connected to one end of the isolation device. The output terminal of the inverter is connected to the load terminal via the output switch.

[0022] The UPS can choose to power the load from either a diesel generator or mains power, or it can choose to power the load from the chassis battery. Mains power or power from the diesel generator enters the UPS through a dual power transfer switch, passing through the input switch, rectifier, inverter, and output switch to the load. When the mains power fails and the diesel generator has not yet started, the circuit breaker closes, and the chassis battery outputs power through the isolation device, circuit breaker, UPS DC-DC converter, UPS inverter, and UPS output switch to the load. When the diesel generator is operating normally, the system detects that the chassis battery is not fully charged. The power generated by the diesel generator passes through the dual power transfer switch, UPS input switch, rectifier, DC-DC converter, circuit breaker, and isolation device to charge the chassis battery. After charging is complete, the circuit breaker is disconnected to stop charging.

[0023] The UPS, dual power transfer switch, diesel generator set, isolation equipment, and circuit breaker are installed in the upper compartment of the UPS power supply vehicle. The chassis battery is installed on the movable chassis of the UPS power supply vehicle, providing power for the chassis's movement. Furthermore, the chassis battery is a swappable battery, allowing for rapid replacement and quick power replenishment.

[0024] Based on the above settings, this embodiment of the invention provides a specific configuration scheme: The UPS power configuration is as follows ,in, Rated power at the load end, in kW; The power configuration of the isolation device is ; The chassis battery capacity is configured as follows: ,in, For battery swapping time, This is for backup time; the unit of electricity consumption is kW·h.

[0025] The power supply system also includes an on-board controller, which is electrically connected to the load and the chassis battery respectively, and is used to detect the load power and battery power, thereby realizing the monitoring of the working status of the power supply system.

[0026] Existing UPS power supply vehicles are limited by standards, with battery system capacities not exceeding 120 kWh, severely restricting the continuous discharge time. Class II chassis using power batteries as the driving energy source are used as the transport vehicle for UPS power supply vehicles. These batteries often have capacities exceeding 300 kWh, and even after reaching the power supply location, a significant amount of charge remains, which can be used to power the load. This invention develops a novel UPS power supply vehicle system that effectively utilizes the remaining battery power after the Class II chassis reaches the power supply location. Two UPS power supply vehicles are used in parallel, with the chassis batteries employing a battery swapping method. By controlling the discharge sequence of the chassis batteries, continuous, uninterrupted discharge under pure electric conditions can be achieved.

[0027] Example 2:

[0028] This invention provides a parallel power supply system for UPS power supply vehicles, comprising multiple UPS power supply vehicles, each employing a power supply system as described in Embodiment 1; the output terminal of the dual power transfer switch in each power supply system is connected to the AC input terminal of the UPS in all power supply systems; the AC output terminal of the UPS in all power supply systems is connected to the load terminal. The power supply systems exchange information via a bus.

[0029] like Figure 2 As shown, a parallel power supply system is constructed using two UPS power supply vehicles as an example. The devices in the two power supply systems are distinguished by numbers 1 and 2, respectively. Its working principle is as follows: When the mains power is normal, controller 1 detects that the mains power is normal and controls the input and output switches of UPS1 / UPS2 to close. The mains power passes through the dual power transfer switch 1 / 2, the input switches of UPS1 / UPS2, the rectifier, the inverter, and the output switch to the load, supplying power to the load. When controller 1 detects an abnormal mains power or a power outage, controller 1 controls circuit breaker 1 to close, opening the input switches of UPS1 / UPS2. Circuit breaker 2 is in the open state, and chassis battery 1 is connected to the load through isolation device 1, circuit breaker 1, and UPS1, continuously supplying power to the load. During the power supply process, controller 1 monitors the power level of chassis battery 1 in real time. When detected At this time, controller 1 sends a command to controller 2, which closes circuit breaker 2 and simultaneously opens circuit breaker 1. The chassis battery 2 is then connected to the load via isolation device 2, circuit breaker 2, and UPS 2, continuing to supply power to the load. Simultaneously with the power supply vehicle 1 opening circuit breaker 1, controller 2 becomes the main controller, and controller 1 sends a battery replacement prompt to the display, while simultaneously alerting staff to replace chassis battery 1 via audible and visual warnings. Upon receiving the warning, staff... Within a specified time, a pre-prepared fully charged battery is swapped using an external battery swapping vehicle. During the swapping process, controller 2 monitors the battery level of chassis battery 2 in real time. When detected When the alarm is triggered, controller 2 issues an alarm signal to prompt the operator whether chassis battery 1 is properly installed, and displays a "Yes / No" confirmation button on the monitor. If the operator completes the installation and clicks "Yes," the alarm is deactivated; otherwise, the alarm continues. Chassis battery 2 continues to supply power to the load. At this time, controller 2 sends a command to controller 1, which closes circuit breaker 1 and simultaneously opens circuit breaker 2. The chassis battery 1 is then connected to the load via isolation device 1, circuit breaker 1, and UPS 1, continuing to supply power to the load. Simultaneously with the power supply vehicle 2 opening circuit breaker 2, controller 1 becomes the main controller, and controller 2 sends a battery replacement prompt to the display, while simultaneously alerting staff to replace chassis battery 2 via audible and visual warnings. Upon receiving the warning, staff... Within a short time, a pre-prepared fully charged battery is swapped using an external battery swapping vehicle. Repeating this process allows for continuous and uninterrupted power supply via the battery. During this process, the power supply vehicle does not start the diesel generator unit, resulting in zero exhaust emissions. Furthermore, the noise level of the battery power supply is significantly lower than that of the diesel generator unit, making it virtually "silent" operation.

[0030] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power supply system for a UPS power supply vehicle, characterized in that, include: UPS; the AC input terminal of the UPS is connected to the diesel generator and the mains power respectively through a dual power transfer switch, the DC terminal of the UPS is connected to the chassis battery through an isolation device, the output ground wire and the input ground wire of the isolation device are set independently, and the AC output terminal of the UPS is connected to the load terminal.

2. The power supply system of the UPS power supply vehicle according to claim 1, characterized in that, The UPS includes a rectifier, an inverter, and a DC-DC converter; the input terminal of the rectifier is connected to the output terminal of the dual power transfer switch, and the output terminal of the rectifier is connected to the input terminal of the inverter and one end of the DC-DC converter; the other end of the DC-DC converter is connected to one end of the isolation device; and the output terminal of the inverter is connected to the load terminal.

3. The power supply system of the UPS power supply vehicle according to claim 2, characterized in that, An input switch is connected in series between the dual power supply switching switch and the rectifier, and an output switch is connected in series between the inverter and the load.

4. The power supply system of the UPS power supply vehicle according to claim 1, characterized in that, A circuit breaker is also connected in series between the isolation device and the DC converter.

5. The power supply system of the UPS power supply vehicle according to claim 4, characterized in that, The UPS, the dual power transfer switch, the diesel generator set, the isolation equipment, and the circuit breaker are installed in the upper compartment of the UPS power vehicle. The chassis battery is installed on the drivable chassis of the UPS power vehicle, and the chassis battery provides power for the drivable chassis to travel.

6. The power supply system of the UPS power supply vehicle according to claim 5, characterized in that, The chassis battery is a swappable battery.

7. The power supply system of the UPS power supply vehicle according to claim 1, characterized in that, The power supply system also includes an on-board controller, which is electrically connected to the load and the chassis battery respectively, and is used to detect the load power and battery charge.

8. The power supply system of the UPS power supply vehicle according to claim 1, characterized in that, The power configuration of the UPS is as follows: ,in, Rated power at the load end, in kW; The power configuration of the isolation device is as follows: ; The chassis battery is configured with the following power ratings: ,in, For battery swapping time, This is for backup time; the unit of electricity is kW·h.

9. A parallel power supply system for a UPS power supply vehicle, characterized in that, The system includes multiple UPS power supply vehicles, each of which employs a power supply system as described in any one of claims 1-8; the output terminal of the dual power transfer switch in each power supply system is connected to the AC input terminal of the UPS in all the power supply systems; and the AC output terminal of the UPS in all the power supply systems is connected to the load terminal.

10. The parallel power supply system for the UPS power supply vehicle according to claim 9, characterized in that, The power supply systems communicate with each other via a bus.

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