A marine three-phase power UPS

Abstract

The present invention discloses a marine three-phase power UPS, wherein a cabinet door connected to the cabinet by a hinge is arranged in front of the cabinet, a cable gland for accessing a three-phase cable is arranged on the left side of the cabinet, a first panel and a second panel from bottom to top are arranged on the front side of the cabinet, and a three-phase power output terminal is connected to an input switch, the input switch is first connected to a bypass switch, and then respectively connected to an AC-DC charger and a main power contactor, the AC-DC charger is respectively connected to a battery pack and a battery circuit breaker, the battery circuit breaker is connected to a DC-AC inverter, the DC-AC inverter is connected to a transformer, the transformer is connected to an inverter output contactor, the main power contactor and the inverter output contactor are respectively connected to an output switch, and the bypass switch and the output switch are respectively connected to the output terminal. The present invention utilizes a three-phase backup power supply system and PWM control technology to provide a three-phase zero-free power supply to an oil supply pump, so that it can normally supply oil to a standby generator set and continue to work for more than half an hour.

Description

Technical Field

[0001] The invention relates to the technical field of uninterruptible power supply, in particular to a marine three-phase power UPS. Background Art

[0002] UPS is an uninterruptible power supply with energy storage device, which is mainly used to provide uninterrupted power supply to some equipments with high requirements on power supply stability. When the mains input is normal, UPS supplies the mains power to the load after voltage stabilization, and it also charges the battery inside the machine; when the mains power is interrupted (power outage), UPS immediately switches the DC power of the battery to 220V AC power to the load through inverter switching, so that the load can maintain normal operation and protect the load software and hardware from damage.

[0003] In the prior art, large ocean-going ships normally use two diesel generators, one of which is a standby diesel generator set. If the two generator sets suddenly fail during navigation, the equipment of the entire large ocean-going ship will not be able to work normally. The main reason why the standby diesel generator cannot start is that the fuel supply system cannot supply fuel. The fuel supply pump cannot supply fuel to the standby diesel generator, causing the standby diesel generator to be unable to work. Manual operation is required to restart the standby diesel generator set, which is inconvenient to use and poses a safety hazard to navigation safety. Therefore, we propose a marine three-phase power UPS to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a marine three-phase power UPS, which utilizes a three-phase backup power supply system and PWM control technology to provide a three-phase non-zero power supply to the oil supply pump, so that it can normally supply oil to the standby generator set and continue to work for more than half an hour.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A marine three-phase power UPS, characterized in that it comprises: a cabinet and a UPS system inside the cabinet, wherein a cabinet door connected to the cabinet by a hinge is arranged in front of the cabinet, a cable gland for accessing a three-phase cable is arranged on the left side of the cabinet, a first panel and a second panel are arranged from bottom to top on the front side of the interior of the cabinet, a battery pack is arranged on the rear side of the first panel, a switch is arranged on the rear side of the second panel, a switch panel and a maintenance mode switch are arranged at the front end, a transformer, a charging board and a control power board are arranged on the rear side of the second panel, and an AC-DC charger, a DC-AC inverter, a control drive circuit and a central processing unit are arranged on the control power board. The UPS system includes an AC-DC charger, a DC-AC inverter, a control drive circuit, an input-output switch and a battery pack. The three-phase power output end is connected to the input switch, the input switch is first connected to the bypass switch, and the input switch is then respectively connected to the AC-DC charger and the main power contactor. The AC-DC charger is respectively connected to the battery pack and the battery circuit breaker, the battery circuit breaker is connected to the DC-AC inverter, the DC-AC inverter is connected to the transformer, the transformer is connected to the inverter output contactor, the main power contactor and the inverter output contactor are respectively connected to the output switch, the bypass switch and the output switch are respectively connected to the output end, and the central processor controls other components.

[0007] Furthermore, the cabinet door is provided with a door lock and indicator lights. There are three indicator lights, namely an output power indicator light, an input power indicator light and a fault indicator light. The indicator lights are electrically connected to the central processing unit. The door lock protects the internal equipment, and the indicator lights indicate the working status.

[0008] Furthermore, ventilation grilles are provided on the left and right sides and the back side of the cabinet, a cable installation plate is provided on the left side of the cabinet, a cable gland is provided on the cable installation plate, a grounding screw hole is provided on the bottom left side of the cabinet, and the grounding is completed by cooperating with the grounding bolt. A lifting ring is provided on the top of the cabinet, the ventilation grille can effectively cool down, the cable installation plate is connected, the cable gland can fix and protect the wires and cables, and the lifting ring facilitates the lifting of the cabinet.

[0009] Furthermore, two parallel channel steel pads are provided at the bottom of the cabinet, a fan is provided at the bottom plate of the cabinet, and fixing screw holes are provided on the channel steel pads. The channel steel pads form a ventilation channel and are used in conjunction with the fan to greatly enhance the heat dissipation effect. The fixing screw holes are used in conjunction with fixing bolts to install the cabinet on the ground.

[0010] Furthermore, the battery pack includes four batteries, and the batteries are colloidal lead-acid batteries. Colloidal lead-acid batteries are maintenance-free, have a long life, and are applicable to a wide range of ambient temperatures.

[0011] Furthermore, it also includes a fan, a transformer connected to a fuse, the fuse is connected to the fan, and the fan is used to dissipate heat when the UPS is working.

[0012] Furthermore, the working mode when the external power supply is normal: when the external power supply is normal, the main power contactor is closed, the inverter output contactor is released, and the ship's oil engine power supply is directly output through the main power contactor to the rear-end load; at the same time, the AC-DC starts working and the AC-DC charges the battery pack.

[0013] Furthermore, the working mode when the external power supply is abnormal: when the external power supply is abnormal, the main power contactor is disconnected, the DC-AC is started, and when the DC-AC output reaches 400V, the inverter output contactor is energized, and the battery is inverted and output, thereby protecting the output load. The switching time from external power interruption to switching to battery inverter operation is less than 1 second.

[0014] Furthermore, manual maintenance mode: when the UPS needs to be repaired or the battery needs to be replaced and the load power supply cannot be interrupted, the input switch is turned to the ON state, and the UPS enters the maintenance bypass mode; in the maintenance mode, the inverter output contactor is always in the disconnected state, the battery circuit breaker is disconnected, the power board and charging board inside the UPS are repaired, or the battery is tested and replaced. At this time, there will be no power inside the UPS, and the maintenance personnel can perform maintenance safely.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the three-phase power UPS for ships has the following advantages:

[0016] 1. Industrial-grade power devices are used, and the output has transformer isolation to eliminate various interferences from ship or shore power grids, and the load starting capability is strong.

[0017] 2. The inverter control, phase synchronization and logic control of UPS all adopt DSP digital control, which has high precision, fast speed, good overall performance and flexible and adjustable output voltage.

[0018] 3. The input voltage range is wide and specially designed for motors to match the applicable voltage range of the motors. At the same time, the input frequency range is further widened, which is suitable for ship oil production machine power supply or shore power environment applications. The wide AC voltage input range can reduce the frequency of battery use and extend the battery life.

[0019] 4. Adopt ECO power supply. When the UPS input power is normal, it directly uses the ship's oil engine or shore power supply; when the UPS detects an abnormal external power supply, it automatically switches to the battery inverter; when the external power supply returns to normal, the UPS automatically returns to the external power supply, and the inverter output is turned off. The system operates with high efficiency, stability and reliability.

[0020] 5. The UPS system comes with a manual maintenance bypass switch. When an internal fault occurs in the system, it can be switched to maintenance mode through manual operation. There is no need to interrupt the output during the equipment maintenance process. During the maintenance process, the rear-end motor load can still continue to be used.

[0021] 6. Functions such as output overvoltage, overcurrent, battery undervoltage, fast current limiting and short circuit protection are designed to avoid failures caused by human operating errors and ensure reliable operation of the equipment under various conditions.

[0022] 7. The PCB circuit board inside the UPS adopts coating technology, which makes the circuit board not easy to corrode in the marine environment, reduces the failure rate of the UPS, improves the power supply reliability of the UPS, and meets the use of the marine environment.

[0023] 8. The UPS is equipped with 4 12V55AH maintenance-free lead-acid gel batteries, which have long battery life and a wide applicable ambient temperature range, which can be used in the range of -20℃-40℃.

[0024] 9. When a UPS fails, the UPS will issue a fault alarm. The UPS cabinet door will have an LED fault indicator light and an alarm signal will be issued through dry contact communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural schematic diagram of a marine three-phase power UPS of the present invention;

[0026] Figure 2 This is a front structural schematic diagram of a marine three-phase power UPS according to the present invention;

[0027] Figure 3 It is a left-side structural schematic diagram of a marine three-phase power UPS of the present invention;

[0028] Figure 4 It is a right view structural schematic diagram of a marine three-phase power UPS of the present invention;

[0029] Figure 5 This is an inner front view of a marine three-phase power UPS according to the present invention;

[0030] Figure 6 This is an inner rear view of a marine three-phase power UPS according to the present invention;

[0031] Figure 7 This is a block diagram of the working principle of a marine three-phase power UPS of the present invention;

[0032] Figure 8 This is an electrical schematic diagram of a marine three-phase power UPS of the present invention;

[0033] Fig. 9The present invention is a wiring terminal diagram of a marine three-phase power UPS.

[0034] In the figure: 1 cabinet, 101 first panel, 102 second panel, 2 lifting ring, 3 cable gland, 4 cabinet door, 41 door lock, 42 ​​indicator light, 5 channel steel pad, 6 ventilation grille, 7 cable mounting plate, 8 grounding screw hole, 9 battery pack, 10 switch, 11 switch panel, 12 maintenance module switch, 13 transformer, 14 charging board, 15 control power board. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "inside", "below", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0042] See also Figure 1-9 , the present invention provides a technical solution:

[0043] Embodiment 1

[0044] like Figure 1-6 As shown, a marine three-phase power UPS includes: a cabinet 1 and a UPS system inside the cabinet 1, a cabinet door 4 connected to the cabinet 1 by a hinge is arranged in front of the cabinet 1, a cable gland 3 for connecting a three-phase cable is arranged on the left side of the cabinet 1, a first panel 101 and a second panel 102 are arranged from bottom to top on the front side of the cabinet 1, a battery pack 9 is arranged on the rear side of the first panel 101, a switch 10 is arranged on the rear side of the second panel 102, a switch panel 11 and a maintenance mode switch 12 are arranged on the front side of the second panel 102, a transformer 13, a charging board 14 and a control power board 15 are arranged on the rear side of the second panel 102, an AC-DC charger, a DC-AC inverter, a control drive circuit and a central processing unit are arranged on the control power board 15, and the UPS system includes an AC-DC charger, a DC-AC inverter, a control drive circuit, an input and output switch and a battery pack, as shown in FIG. Figure 7-8 As shown, the three-phase electrical output end is connected to the input switch QF1, the input switch QF1 is first connected to the bypass switch QF3, and the input switch QF1 is then connected to the AC-DC charger and the main power contactor Q1 respectively, the AC-DC charger is connected to the battery pack 9 and the battery circuit breaker QF2 respectively, the battery circuit breaker QF2 is connected to the DC-AC inverter, the DC-AC inverter is connected to the transformer 13, the transformer 13 is connected to the inverter output contactor Q2, the main power contactor Q1 and the inverter output contactor Q2 are respectively connected to the output switch QF4, the bypass switch QF3 and the output switch QF4 are respectively connected to the output end, and the central processor is electrically connected to the UPS system.

[0045] When the external power supply is normal, the main power contactor Q1 is energized, the inverter output contactor Q2 is released, and the ship's oil engine power is directly output through Q1 to the rear-end load; at the same time, the charger starts working and charges the battery pack; when the external power supply is abnormal, the main power contactor Q1 is disconnected, the DC-AC inverter is started, and when the DC-AC inverter outputs to 400V, the UPS inverter output contactor Q2 is energized, and the battery is output after inversion, thereby protecting the output load. The switching time from external power interruption to switching to DC-AC inverter operation is less than 1 second.

[0046] Among them, Figure 2 As shown, the cabinet door 4 is provided with a door lock 41 and indicator lights 42. There are three indicator lights 42, namely, an output power indicator light, an input power indicator light and a fault indicator light. The indicator lights 42 are electrically connected to the central processing unit. The door lock 41 protects the internal equipment. The indicator lights 42 indicate the working status. During normal operation, the LED indications are that the input power light is on, the output electrophoresis light is on, and the fault light is off; when the external power supply is interrupted and powered by the battery, the output power light is on, the input power light is off, and the fault light is off; when the external power supply is normal and only the battery is charged and no output is performed, the input power light is on, the output power light is off, and the fault light is off.

[0047] like Figure 3-4 As shown, ventilation grilles 6 are provided on the left and right sides and the back side of the cabinet 1, a cable installation plate 7 is provided on the left side of the cabinet 1, a cable gland 3 is provided on the cable installation plate 7, a grounding screw hole 8 is provided at the bottom of the left side of the cabinet 1, and the grounding is completed by cooperating with the grounding bolt. A lifting ring 2 is provided on the top of the cabinet 1, and the ventilation grille 6 can effectively cool down. The cable installation plate is connected, and the cable gland 3 can fix and protect the wires and cables. The lifting ring 2 facilitates the lifting of the cabinet 1.

[0048] Embodiment 2

[0049] The difference between this embodiment and the first embodiment is that:

[0050] like Figure 1-4 As shown, two parallel channel steel pads 5 are provided at the bottom of the cabinet 1, a fan is provided on the bottom plate of the cabinet 1, fixing screw holes are provided on the channel steel pads 5, and the channel steel pads 5 form a ventilation channel, which is used in conjunction with the fan to greatly enhance the heat dissipation effect, and the fixing screw holes are used in conjunction with the fixing bolts to install the cabinet 1 on the ground.

[0051] The battery pack 9 includes four batteries, which are colloidal lead-acid batteries. The colloidal lead-acid batteries are maintenance-free, have a long life, and are suitable for a wide range of ambient temperatures. Figure 7 As shown, a fan is also included. The transformer 13 is connected to the fuse FU, and the fuse FU is connected to the fan. The fan is used to dissipate heat when the UPS is working.

[0052] How it works

[0053] When the external power supply is normal, the UPS system controls the power supply from the external power supply output; at any time, if the external power supply is undervoltage or suddenly loses power, the battery inverter will supply power; when the external power supply returns to normal, the UPS system automatically switches back to the external power grid for power supply. The control switching is completed automatically, and the switching time is less than 1 second. When the UPS internal fault needs to be repaired, it can be manually switched to the maintenance mode, and the back-end load can continue to work; after the equipment is repaired, it can be manually switched back to the normal working mode.

[0054] UPS has the following three working modes:

[0055] Working mode when the external power supply is normal: When the external power supply is normal, the main power contactor Q1 is energized, the inverter output contactor Q2 is released, and the ship's oil engine power supply is directly output to the rear-end load through the main power contactor Q1; at the same time, the AC-DC charger starts working and charges the battery pack 9.

[0056] Working mode when external power supply is abnormal: When the external power supply is abnormal, the main power contactor Q1 is disconnected, the DC-AC inverter is started, and when the DC-AC inverter outputs to 400V, the inverter output contactor Q2 is energized, and the battery is output after inversion, thereby protecting the output load. The switching time from external power interruption to switching to DC-AC inverter operation is less than 1 second.

[0057] Manual maintenance mode: When the UPS needs to be repaired or the battery is replaced and the load power supply cannot be interrupted, turn the input switch QF1 to the ON state and the UPS enters the maintenance bypass mode; in the maintenance mode, the inverter output contactor Q2 is always in the disconnected state, disconnect the battery circuit breaker QF2, repair the internal power board and charging board of the UPS, or detect and replace the battery.

[0058] Working process

[0059] When the external power supply is normal, the AC power is supplied to the AC-DC charger to charge the 48V battery pack, and at the same time, it is output to the motor through the Q1 contactor. If the external power supply is undervoltage or suddenly loses power at any time, the battery pack DC-AC inverter will supply power. The switching time from grid power supply to battery power supply is less than 1 second. When the battery energy is about to run out, the UPS will issue an audible and visual alarm, and stop the DC-AC inverter at the lower limit of battery discharge, and sound a long alarm. After the battery undervoltage protection, when the external power supply resumes normal power supply, the device will restart and charge the battery pack.

[0060] ECO working principle: When the quality of the mains power is excellent, the UPS host system supplies power to the load through the bypass EMC filter output, and the inverter is on standby; when the mains voltage or frequency exceeds a certain range, the UPS switches to double conversion working mode.

[0061] It should be noted that the control power board is JL-3P-3KW from Gaoxing, the charging board is JL48VDC from Gaoxing, the contactor and circuit breaker are from Schneider, the central processor is ATMEGA16U2-MU from microchip, the battery is 12V55AH GEL from Baodi, the transformer is ZL026400-B from Domestic famous, and other components are existing products purchased from the market. Their internal structure is a known structure, and their working principle is also common sense, so they will not be explained in detail here.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A marine three-phase power UPS, characterized in that: include: A cabinet (1) and a UPS system inside the cabinet (1), wherein a cabinet door (4) connected to the cabinet (1) by a hinge is arranged at the front of the cabinet (1), a cable gland (3) for connecting a three-phase cable is arranged at the left side of the cabinet (1), a first panel (101) and a second panel (102) are arranged from bottom to top at the front side of the cabinet (1), a battery pack (9) is arranged at the rear side of the first panel (101), a switch (10) is arranged at the rear side of the second panel (102), a switch panel (11) and a maintenance mode switch (12) are arranged at the front side of the second panel (102), a transformer (13), a charging board (14) and a control power board (15) are arranged at the rear side of the second panel (102), and an AC-DC charger, a DC-AC inverter, a control drive, and a control circuit are arranged on the control power board (15). Circuit and central processor, the UPS system comprises an AC-DC charger, a DC-AC inverter, a control drive circuit, an input-output switch and a battery pack, the three-phase electrical output end is connected to an input switch QF1, the input switch QF1 is first connected to a bypass switch QF3, the input switch QF1 is then respectively connected to an AC-DC charger and a main electrical contactor Q1, the AC-DC charger is respectively connected to a battery pack (9) and a battery circuit breaker QF2, the battery circuit breaker QF2 is connected to a DC-AC inverter, the DC-AC inverter is connected to a transformer (13), the transformer (13) is connected to an inverter output contactor Q2, the main electrical contactor Q1 and the inverter output contactor Q2 are respectively connected to an output switch QF4, the bypass switch QF3 and the output switch QF4 are respectively connected to the output end, and the central processor controls other components; The cabinet door (4) is provided with a door lock (41) and indicator lights (42). The indicator lights (42) are three, namely an output power indicator light, an input power indicator light and a fault indicator light. The indicator lights (42) are electrically connected to a central processing unit. The cabinet (1) is provided with ventilation grilles (6) on both sides and the back side, a cable installation plate (7) is provided on the left side of the cabinet (1), a cable gland (3) is provided on the cable installation plate (7), a grounding screw hole (8) is provided at the bottom of the left side of the cabinet (1), and is matched with a grounding bolt to complete grounding, and a lifting ring (2) is provided on the top of the cabinet (1).

2. A marine three-phase power UPS according to claim 1, characterized in that: The bottom of the cabinet (1) is provided with two parallel channel steel pads (5), the bottom plate of the cabinet (1) is provided with a fan, and the channel steel pads (5) are provided with fixing screw holes.

3. A marine three-phase power UPS according to claim 1, characterized in that: The battery pack (9) comprises four batteries, and the batteries are colloidal lead-acid batteries.

4. A marine three-phase power UPS according to claim 1, characterized in that: It also includes a fan, a transformer (13) connected to a fuse FU, and the fuse FU is connected to the fan.

5. A marine three-phase power UPS according to claim 1, characterized in that: Working mode when the external power supply is normal: When the external power supply is normal, the main power contactor Q1 is energized, the inverter output contactor Q2 is released, and the ship's diesel engine power is directly output through the main power contactor Q1 to the rear-end load; at the same time, the AC-DC charger starts working and charges the battery pack (9).

6. A marine three-phase power UPS according to claim 1, characterized in that: Working mode when external power supply is abnormal: When the external power supply is abnormal, the main power contactor Q1 is disconnected, the DC-AC inverter is started, and when the DC-AC inverter outputs to 400V, the inverter output contactor Q2 is energized, and the battery is output after inversion, thereby protecting the output load. The switching time from external power interruption to switching to DC-AC inverter operation is less than 1 second.

7. A marine three-phase power UPS according to claim 1, characterized in that: Manual maintenance mode: When the UPS needs to be repaired or the battery is replaced and the load power supply cannot be interrupted, turn the input switch QF1 to the ON state and the UPS enters the maintenance bypass mode; in the maintenance mode, the inverter output contactor Q2 is always in the disconnected state, disconnect the battery circuit breaker QF2, repair the internal power board and charging board of the UPS, or detect and replace the battery.

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