CN219938026U - Seamless switching alternating current power distribution circuit - Google Patents
Seamless switching alternating current power distribution circuit Download PDFInfo
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- CN219938026U CN219938026U CN202320111046.5U CN202320111046U CN219938026U CN 219938026 U CN219938026 U CN 219938026U CN 202320111046 U CN202320111046 U CN 202320111046U CN 219938026 U CN219938026 U CN 219938026U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 16
- 229910052744 lithium Inorganic materials 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The utility model provides a seamless switching alternating current power distribution circuit, wherein two uninterruptible power supplies in a double-power uninterruptible power supply device can be switched in a seamless manner, and the stability of external power supply is ensured. The alternating current power distribution circuit comprises: 380V power distribution units and 220V power distribution units; the 380V power distribution unit includes: two inverters and two 380V buses; the 220V power distribution unit includes: 220V busbar, transformer A, transformer B and two duplicate supply uninterruptible power devices; the phases of the alternating currents output by the two inverters are consistent; the input end of the transformer A is connected with the output end of an inverter, and the output ends are respectively connected with the input end of an uninterruptible power supply in the two double-power uninterruptible power supply devices; the input end of the transformer B is connected with the output end of the other inverter, and the output ends of the transformer B are respectively connected with the input end of the other uninterruptible power supply in the two uninterruptible power supply devices; the output ends of the two dual-power uninterruptible power devices are connected with 220V buses.
Description
Technical Field
The utility model relates to a power distribution circuit, in particular to a seamless switching alternating current power distribution circuit, and belongs to the technical field of power transmission and distribution of power systems.
Background
The unmanned ship alternating current power distribution system mainly receives electric energy generated by a power supply system, and then converts the electric energy into required alternating current to complete the task of distributing power to various alternating current electric equipment on the unmanned ship so as to ensure that alternating current loads on the unmanned ship are stably and reliably supplied with power.
In order to ensure high stability and high reliability of electric equipment, the prior art adopts a power distribution scheme of simply connecting a plurality of power supplies in parallel and carrying out current sharing or a power supply scheme of switching between main power supply and standby power supply; however, when different power supplies execute a main power supply task, seamless switching power supply cannot be realized, so that stability and reliability of external power supply cannot be ensured.
Disclosure of Invention
In view of the above, the present utility model provides a seamless switching ac power distribution circuit, which can enable two uninterruptible power supplies in a dual-power uninterruptible power supply device to be seamlessly switched, thereby ensuring stability and reliability of external power supply.
A seamless switched ac power distribution circuit comprising: 380V power distribution units and 220V power distribution units;
the 380V power distribution unit includes: two inverters and two 380V buses;
the input ends of the two inverters are respectively connected with the power supply unit, and the output ends of the two inverters are connected with the two 380V buses;
the 220V power distribution unit includes: 220V busbar, transformer A, transformer B and two duplicate supply uninterruptible power devices;
two uninterruptible power supplies are arranged in each double-power uninterruptible power supply device, and the output ends of the two uninterruptible power supplies are connected in parallel to form the output end of the double-power uninterruptible power supply device;
the input end of the transformer A is connected with the output end of one of the inverters, and the output end of the transformer A is divided into two branches which are respectively connected with the input end of one uninterruptible power supply in the two double-power uninterruptible power devices; the input end of the transformer B is connected with the output end of the other inverter, and the output end of the transformer B is divided into two branches which are respectively connected with the input end of the other uninterruptible power supply in the two uninterruptible power supply devices; the output ends of the two dual-power uninterruptible power devices are connected with 220V buses;
the phases of the alternating currents output by the two inverters are identical.
As a preferable mode of the utility model, the switch arranged at the two input ends of one of the double-power uninterruptible power devices is interlocked with the switch arranged at the two input ends of the other double-power uninterruptible power device, and when the two switches at the input ends of the one double-power uninterruptible power device are switched on, the two switches at the input ends of the other double-power uninterruptible power device are switched off.
As a preferred mode of the present utility model, the power supply unit includes: three DC generators, a DC bus A and a DC bus B; the three direct current generators are respectively a generator G1, a generator G2 and a generator G3;
the generator G1 and the generator G3 are respectively and electrically connected with the direct current bus A through a circuit provided with a switch; the generator G3 is electrically connected with the direct-current busbar B through a circuit provided with a switch; the direct-current busbar B is also provided with a shore power interface, and a line provided with a switch at the shore power interface is electrically connected with the direct-current busbar B;
the two inverters are respectively connected with the direct current bus A and the direct current bus B through circuits provided with switches.
In a preferred embodiment of the present utility model, the dc generator is a rectified buck generator operated with variable speed and variable voltage, and is capable of outputting a dc voltage of 560V to 710V.
As a preferred mode of the present utility model, the power supply unit further includes a lithium battery pack; the lithium battery pack is electrically connected with the direct current bus bar A and the direct current bus bar B through the lithium battery charging and discharging device respectively.
As a preferred mode of the utility model, the input ends of the two inverters are respectively connected with the power supply unit through a circuit provided with a direct-current molded case circuit breaker, and the output ends of the two inverters are respectively connected with the two 380V buses through a circuit provided with an alternating-current molded case circuit breaker.
As a preferred mode of the utility model, the output end of the transformer a is connected with the input end of one uninterruptible power supply of the two double-power uninterruptible power supply devices through a circuit provided with an alternating-current molded case circuit breaker respectively; the output end of the transformer B is connected with the input end of the other uninterruptible power supply in the two double-power uninterruptible power supply devices through a circuit provided with an alternating current molded case circuit breaker.
The beneficial effects are that:
(1) In the alternating current power distribution circuit, two mutually independent power distribution lines are arranged in a 380V power distribution unit, and can respectively supply power for 380V alternating current loads; two double-power uninterruptible power devices are adopted in the 220V power distribution unit to be connected in parallel, and one main device and one standby device are arranged, so that the stability and the reliability of power supply to a 220V alternating current load can be ensured; and by enabling the phases of the alternating currents output by the two inverters to be consistent, the seamless switching of the two uninterruptible power supplies in the double-power uninterruptible power supply device can be achieved, and the power supply stability of the double-power uninterruptible power supply device is improved.
(2) In the alternating current power distribution circuit, the 220V power distribution unit directly adopts the transformer to convert alternating current 380V voltage obtained by conversion of the inverter in the 380V power distribution unit into alternating current 220V voltage, namely, the 220V power distribution unit does not need to be additionally provided with the inverter, so that the power distribution circuit has a compact structure and is convenient to arrange in a power distribution cabinet.
(3) In the alternating current power distribution circuit, the generator in the power supply unit adopts the rectifying amplitude-voltage generator which operates at variable speed and variable voltage, and the rotating speed can be adjusted according to the electric quantity requirement of a load, so that the output voltage of the generator can be adjusted within the range of 560V-710V, the fuel economy is good, the high endurance can be realized, and the long-distance requirement of a ship can be met.
(4) In the alternating current power distribution circuit, the power supply unit further comprises a lithium battery pack, and when the unmanned ship is in a low-noise working condition, a generator is not required to be started, and the lithium battery pack supplies power to the two direct current buses through the lithium battery charging and discharging device, so that power is supplied to propulsion equipment on the unmanned ship and daily loads on the whole ship, and low noise during ship running can be realized.
Drawings
FIG. 1 is a schematic diagram of an AC power distribution circuit according to the present utility model;
fig. 2 is a schematic diagram of the structure of the power supply unit.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings and examples.
Example 1:
the embodiment provides a seamless switching alternating current power distribution circuit for an unmanned ship power supply system, wherein the power distribution circuit is used for receiving direct current provided by an unmanned ship power supply unit, converting the direct current into 380V and 220V alternating current and supplying power to an unmanned ship alternating current load stably and reliably.
As shown in fig. 1, the seamless switching ac power distribution circuit includes: 380V power distribution units and 220V power distribution units.
Wherein 380V power distribution unit includes: inverter a, inverter B, 380V bus a, and 380V bus B; the input ends of the inverter A and the inverter B are respectively connected with the power supply unit through a circuit provided with a direct current molded case circuit breaker and are used for converting 710V direct current provided by the power supply unit into 380V alternating current; the output end of the inverter A is connected with the 380V busbar A through a circuit provided with an alternating current molded case circuit breaker, so as to supply power to a 380V alternating current load connected to the 380V busbar A; the output end of the inverter B is connected with the 380V busbar B through a circuit provided with an alternating current molded case circuit breaker, so as to supply power to a 380V alternating current load connected to the 380V busbar B. The two alternating current plastic shell circuit breakers are used as alternating current 380V incoming line switches, and the switching-on is respectively used for supplying power to respective 380V buses.
The 220V power distribution unit includes: the device comprises a transformer A, a transformer B, a double-power uninterruptible power device A, a double-power uninterruptible power device B and a 220V bus.
The dual-power uninterruptible power supply device A and the dual-power uninterruptible power supply device B have the same structure, and are one master and one slave; taking a double-power-supply uninterrupted power supply device A as an example, two uninterrupted power supplies are connected in parallel in the double-power-supply uninterrupted power supply device A, the double-power-supply uninterrupted power supply device A is provided with two input ends and an output end, the two input ends respectively correspond to the two uninterrupted power supplies in the double-power-supply uninterrupted power supply device A, and the output ends of the two uninterrupted power supplies are connected in parallel to form an output end for outputting.
The input end of the transformer A is connected with the output end of the inverter A, the output end of the transformer A is divided into two branches, and the two branches are respectively connected with one input end of the double-power uninterruptible power supply device A and one input end of the double-power uninterruptible power supply device B through a circuit provided with an alternating-current molded case circuit breaker; the input end of the transformer B is connected with the output end of the inverter B, the output end of the transformer B is divided into two branches, and the two branches are respectively connected with the other input end of the double-power uninterruptible power supply device A and the other input end of the double-power uninterruptible power supply device B through circuits provided with alternating-current molded case circuit breakers. The output ends of the double-power uninterruptible power supply A and the double-power uninterruptible power supply B are connected with the 220V bus, so as to supply power to a 220V alternating current load connected to the 220V bus.
The direct current plastic shell circuit breakers and the alternating current plastic shell circuit breakers have overload and short circuit protection functions.
In order to ensure the reliability of power supply to 220V alternating current loads, two double-power uninterruptible power devices are arranged in parallel in a 220V power distribution unit, only one double-power uninterruptible power device is used for supplying power to a 220V bus in normal operation, and only when the double-power uninterruptible power device fails, the other double-power uninterruptible power device is switched into operation, so that a redundant AC220V power supply loop is realized. The realization method comprises the following steps: when the two alternating current plastic shell breakers connected with one double-power uninterruptible power device are switched on, the two alternating current plastic shell breakers connected with the other double-power uninterruptible power device are disconnected, namely only one of the two alternating current plastic shell breakers of the double-power uninterruptible power device can be switched on at any moment.
In order to realize seamless switching of two uninterruptible power supplies in a double-power uninterruptible power supply device (the general term of the double-power uninterruptible power supply device A and the double-power uninterruptible power supply device B), the phases of alternating currents output by the two inverters are consistent through communication between the two inverters (namely the inverter A and the inverter B), so that the phases of the alternating currents input into the two uninterruptible power supplies in the double-power uninterruptible power supply device are consistent, and experiments prove that the switching time is less than 5ms on the premise that the alternating currents input into the two uninterruptible power supplies in the double-power uninterruptible power supply device meet the same phase, thereby realizing seamless switching of alternating currents of 220V.
Example 2:
on the basis of embodiment 1 described above, one structural form of the power supply unit is given in this embodiment.
As shown in fig. 2, the power supply unit in this example includes: three DC generators; the power supply unit is connected with the alternating current distribution circuit through two direct current buses; the two direct current buses are electrically connected through the isolating switch.
The two direct current buses are respectively a direct current bus A and a direct current bus B; the three direct current generators are respectively a generator G1, a generator G2 and a generator G3;
the generator G1 and the generator G3 are respectively and electrically connected with the direct current busbar A through a circuit provided with a direct current frame type breaker; the generator G3 is electrically connected with the direct current busbar B through a circuit provided with a direct current frame type breaker; in addition, the DC bus B is also provided with a shore power interface, and a line of the shore power interface provided with the DC frame type circuit breaker is electrically connected with the DC bus B.
The inverter A is connected with the direct-current busbar A through a circuit provided with a direct-current molded case circuit breaker, and the inverter B is connected with the direct-current busbar B through a circuit provided with a direct-current molded case circuit breaker.
In the example, three direct current generators are all rectification amplitude voltage generators running at variable speed and variable voltage, and can output 560V-710V direct current; therefore, the rotating speed can be adjusted according to the electric quantity demand of the load, so that the output voltage of the generator can be adjusted within the range of 560V-710V, the fuel economy is good, the high endurance can be realized, and the long-range requirement of the ship is met.
Example 3:
on the basis of embodiment 2 described above, the power supply unit further includes: a lithium battery pack; the lithium battery pack is respectively and electrically connected with the direct current bus bar A and the direct current bus bar B through a lithium battery charging and discharging device; under the low-speed working condition (such as 3-6 knots of sailing speed) of the unmanned ship, the lithium battery pack supplies power to the two direct-current buses through the lithium battery charging and discharging device, so that power is supplied to propulsion equipment on the unmanned ship and daily loads on the whole ship, and low noise during ship travelling can be realized. In addition, the shore power and the generator can charge the lithium battery pack through the lithium battery charging and discharging device.
While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.
Claims (7)
1. A seamless switching alternating current power distribution circuit is characterized in that: comprising the following steps: 380V power distribution units and 220V power distribution units;
the 380V power distribution unit includes: two inverters and two 380V buses;
the input ends of the two inverters are respectively connected with the power supply unit, and the output ends of the two inverters are connected with the two 380V buses;
the 220V power distribution unit includes: 220V busbar, transformer A, transformer B and two duplicate supply uninterruptible power devices;
two uninterruptible power supplies are arranged in each double-power uninterruptible power supply device, and the output ends of the two uninterruptible power supplies are connected in parallel to form the output end of the double-power uninterruptible power supply device;
the input end of the transformer A is connected with the output end of one of the inverters, and the output end of the transformer A is divided into two branches which are respectively connected with the input end of one uninterruptible power supply in the two double-power uninterruptible power devices; the input end of the transformer B is connected with the output end of the other inverter, and the output end of the transformer B is divided into two branches which are respectively connected with the input end of the other uninterruptible power supply in the two uninterruptible power supply devices; the output ends of the two dual-power uninterruptible power devices are connected with 220V buses;
the phases of the alternating currents output by the two inverters are identical.
2. The seamless switched ac power distribution circuit of claim 1 wherein: the switch arranged at two input ends of one of the double-power uninterruptible power devices is interlocked with the switch arranged at two input ends of the other double-power uninterruptible power device, and when the two switches at the input ends of the one double-power uninterruptible power device are switched on, the two switches at the input ends of the other double-power uninterruptible power device are switched off.
3. The seamless switched ac power distribution circuit of claim 1 wherein: the power supply unit includes: three DC generators, a DC bus A and a DC bus B; the three direct current generators are respectively a generator G1, a generator G2 and a generator G3;
the generator G1 and the generator G3 are respectively and electrically connected with the direct current bus A through a circuit provided with a switch; the generator G3 is electrically connected with the direct-current busbar B through a circuit provided with a switch; the direct-current busbar B is also provided with a shore power interface, and a line provided with a switch at the shore power interface is electrically connected with the direct-current busbar B;
the two inverters are respectively connected with the direct current bus A and the direct current bus B through circuits provided with switches.
4. The seamless switched ac power distribution circuit of claim 3 wherein: the direct-current generator is a rectifying amplitude-voltage generator which adopts variable-speed variable-voltage operation and can output 560V-710V direct-current voltage.
5. The slot-switched ac power distribution circuit of claim 3 or 4, wherein: the power supply unit further comprises a lithium battery pack; the lithium battery pack is electrically connected with the direct current bus bar A and the direct current bus bar B through the lithium battery charging and discharging device respectively.
6. The slot-switched ac power distribution circuit of any of claims 1-4, wherein: the input ends of the two inverters are respectively connected with the power supply unit through lines provided with direct-current molded case circuit breakers, and the output ends of the two inverters are respectively connected with the two 380V bus bars through lines provided with alternating-current molded case circuit breakers.
7. The ac power distribution circuit of any one of claims 1-4, wherein: the output end of the transformer A is connected with the input end of one uninterruptible power supply of the two double-power uninterruptible power supply devices through a circuit provided with an alternating current molded case circuit breaker respectively; the output end of the transformer B is connected with the input end of the other uninterruptible power supply in the two double-power uninterruptible power supply devices through a circuit provided with an alternating current molded case circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320111046.5U CN219938026U (en) | 2023-01-20 | 2023-01-20 | Seamless switching alternating current power distribution circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320111046.5U CN219938026U (en) | 2023-01-20 | 2023-01-20 | Seamless switching alternating current power distribution circuit |
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| Publication Number | Publication Date |
|---|---|
| CN219938026U true CN219938026U (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320111046.5U Active CN219938026U (en) | 2023-01-20 | 2023-01-20 | Seamless switching alternating current power distribution circuit |
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|---|---|
| CN (1) | CN219938026U (en) |
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2023
- 2023-01-20 CN CN202320111046.5U patent/CN219938026U/en active Active
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