CN210351037U - Voltage converter and power supply system for ship - Google Patents
Voltage converter and power supply system for ship Download PDFInfo
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- CN210351037U CN210351037U CN201920926365.5U CN201920926365U CN210351037U CN 210351037 U CN210351037 U CN 210351037U CN 201920926365 U CN201920926365 U CN 201920926365U CN 210351037 U CN210351037 U CN 210351037U
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Abstract
Embodiments of the present disclosure relate to a voltage converter and a power supply system for a ship. The voltage converter is used for performing voltage conversion between an alternating current network and a load, and between a motor and the load. The voltage converter includes an inverting and rectifying circuit that is used to couple to a load via a dc link. The voltage converter further comprises a first switch connected to the inverting and rectifying circuit and a second switch connected to the inverting and rectifying circuit. The first switch is used to connect the ac power grid and is capable of being closed to cause the inverting and rectifying circuit to perform voltage conversion between the ac power grid and the load. The second switch is used to connect the motor and can be closed to cause the inverter and rectifier circuit to perform voltage conversion between the motor and the load. The voltage converter also includes a controller coupled to the first switch and the second switch, respectively, and configured to selectively close one of the first switch and the second switch. In this way, the production cost is reduced, and the system efficiency is improved.
Description
Technical Field
Embodiments of the present disclosure relate generally to electrical equipment, and more particularly, embodiments of the present disclosure relate to voltage converters and power supply systems for marine vessels.
Background
Dc-ac or ac-dc converters are widely used in a variety of different power supply systems. In the marine industry, voltage converters in power supply systems installed on ships aim at converting alternating voltage from an alternating current network or a generator of the ship into direct voltage for other consumers in the ship.
In conventional solutions, the converter is often configured to be dedicated to a single use. For example, an inverter is configured to drive a motor, while a rectifier is used to provide a dc voltage from an ac grid to a dc bus or dc grid. The inverter and the rectifier may be general power elements according to the driving state of the ship. An inverter is used to charge a battery onboard a ship, for example, when the ship is parked.
Since a plurality of different voltage converters need to be installed on the shore and the ship in the conventional scheme, the construction cost is increased, and the improvement of the system efficiency is not facilitated.
SUMMERY OF THE UTILITY MODEL
To at least partially solve the problems of the prior art and other potential problems, a converter and a power supply system for a marine vessel are provided.
In a first aspect of the present disclosure, a voltage converter is provided. The voltage converter is used for performing voltage conversion between an alternating current network and a load, and between a motor and the load. The voltage converter includes an inverting and rectifying circuit that is used to couple to a load via a dc link. The voltage converter further comprises a first switch connected to the inverting and rectifying circuit and a second switch connected to the inverting and rectifying circuit. The first switch is used to connect the ac power grid and is capable of being closed to cause the inverting and rectifying circuit to perform voltage conversion between the ac power grid and the load. The second switch is used to connect the motor and can be closed to cause the inverter and rectifier circuit to perform voltage conversion between the motor and the load. The voltage converter also includes a controller coupled to the first switch and the second switch, respectively, and configured to selectively close one of the first switch and the second switch.
In this way, by providing one switch between the inverter and rectifier circuit and the ac power grid and one switch between the inverter and rectifier circuit and the motor, voltage conversion between the ac power grid and the load and between the motor and the load can be realized by the same voltage converter, thereby significantly reducing construction costs.
In some embodiments, the voltage converter is used for a vessel, wherein the controller is used for closing the first switch and opening the second switch in an onshore state of the vessel and for closing the second switch and opening the first switch in an offshore state of the vessel.
The on/off of the first switch and the second switch can be controlled based on the running state of the ship. In this way, it is possible to charge the electrical equipment on board the ship using the on-shore ac power grid in the on-shore state of the ship, and to charge the electrical equipment on board the ship using the on-board generator in the off-shore state of the ship, i.e., in the traveling state, and the rational utilization of the power supply system is improved.
In some embodiments, the voltage converter further includes a sensor coupled to the controller and the load. The sensor is for detecting a voltage level of a load, and the controller is for causing the ac power grid to supply power to the load via the inverting and rectifying circuit by closing the first switch or causing the motor to supply power to the load via the inverting and rectifying circuit by closing the second switch in response to the sensor detecting that the voltage level of the load is below a first threshold level.
In some embodiments, the voltage converter further includes a sensor coupled to the controller and the load. The sensor is for detecting a voltage level of the load, and the controller is for discharging the load to the ac power grid via the inverter and rectifier circuit by closing the first switch or discharging the inverter and rectifier circuit to the motor via the inverter and rectifier circuit by closing the second switch in response to the sensor detecting that the voltage level of the load is above a second threshold level.
By configuring the sensor, the voltage converter can automatically determine the voltage conversion modes of the inversion circuit and the rectification circuit so as to control the flow direction of the voltage, thereby improving the application efficiency and the flexibility of functions of the power supply system.
In some embodiments, the voltage converter further comprises a human-machine interaction interface coupled to the controller. The controller is used for enabling an alternating current network to supply power to the load through an inversion and rectification circuit by closing the first switch or enabling a motor to supply power to the load through the inversion and rectification circuit by closing the second switch in response to receiving an instruction that the load is to be charged through a human-computer interaction interface.
In some embodiments, the voltage converter further comprises a human-machine interaction interface coupled to the controller. The controller is used for responding to the instruction that the load is to be discharged through the man-machine interaction interface, and enabling the load to be discharged to the alternating current power grid through the inversion and rectification circuit by closing the first switch or enabling the inversion and rectification circuit to be discharged to the motor through the inversion and rectification circuit by closing the second switch.
The voltage conversion mode of the inversion and rectification circuit can be determined by receiving an instruction from the man-machine interaction interface so as to control the flow direction of voltage, and therefore the application efficiency and the flexibility of functions of the power supply system are improved.
In some embodiments, the voltage converter includes a dc-to-ac voltage converter and an ac-to-dc voltage converter. In this way, a versatile voltage converter for a power supply system of a ship can be realized with common electrical components, and thus the manufacturing cost is significantly reduced.
In a second aspect of the present disclosure, a power supply system for a marine vessel is provided. The power supply system comprises a voltage converter according to the first aspect. The power supply system also includes an ac power grid coupled to the first switch of the voltage converter, a motor coupled to the second switch of the voltage converter, and a load coupled to the rectifying and inverting circuit of the voltage converter.
In this way, voltage conversion between the ac power supply system and the load and between the motor and the load can be achieved by means of the same voltage converter, so that the construction costs are significantly reduced.
In some embodiments, the first switch is closed in an onshore state of the vessel and the second switch is closed in an offshore state of the vessel.
The on/off of the first switch and the second switch can be controlled based on the running state of the ship. In this way, it is possible to charge the electrical equipment on board the ship using the on-shore ac power grid in the on-shore state of the ship, and to charge the electrical equipment on board the ship using the on-board generator in the off-shore state of the ship, i.e., in the traveling state, and the rational utilization of the power supply system is improved.
In some embodiments, the power supply system further comprises a transformation and filtering circuit coupled between the ac power grid and the first switch. The transformation and filtering circuit is used for transforming and filtering an alternating voltage from or to be provided to an alternating current network.
The summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure.
Drawings
The above and other objects, features and advantages of the embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
fig. 1 shows a schematic block diagram including a converter according to an embodiment of the present disclosure;
fig. 2 shows a schematic diagram of one example of a power supply system for a vessel comprising a converter according to an embodiment of the present disclosure; and
fig. 3 shows a schematic diagram of another example of a power supply system for a marine vessel comprising a converter according to an embodiment of the present disclosure.
Like or corresponding reference characters designate like or corresponding parts throughout the several views.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
As described above, in the conventional scheme, the voltage converter installed in the ship is often configured to be dedicated to a single use. For example, an inverter is configured to drive a motor, while a rectifier is used to provide a dc voltage from an ac grid to a dc bus or dc grid. The inverter and the rectifier may be general power elements according to the driving state of the ship. An inverter is used to charge a battery onboard a ship, for example, when the ship is parked. Since a plurality of different voltage converters need to be installed on the shore and the ship in the conventional scheme, the construction cost is increased, and the improvement of the system efficiency is not facilitated.
To solve the above and other potential problems, embodiments of the present disclosure provide a multipurpose voltage converter to meet the needs of different usage scenarios of a power supply system, thereby reducing system overhead and improving system efficiency. Fig. 1 shows a block diagram of a power supply system for a marine vessel comprising a converter according to an embodiment of the present disclosure.
As shown in fig. 1, a voltage converter 100 of an embodiment of the present disclosure may include an inverting and rectifying circuit 110. The inverting and rectifying circuit 110 is coupled to a load 400. In some embodiments, the inverting and rectifying circuit 110 may include, for example, an inverter and a rectifier coupled to each other. In addition, the inverting and rectifying circuit 110 may also include other electrical components that integrate inverting and rectifying functions.
The voltage converter 100 may further include a first switch 121 disposed between the inverter and rectifier circuit 110 and the ac power grid 200 and a second switch 122 disposed between the inverter and rectifier circuit 110 and the motor 300. In some embodiments, the first switch 121 and the second switch 122 may be implemented as a single circuit breaker, respectively. In some embodiments, the first switch and the second switch may also be integrally implemented as a switch assembly, such as the switch module 120 shown in fig. 1.
The voltage converter 100 may further include a controller 130. The controller 130 may be coupled to the first switch 121 and the second switch 122, respectively. The controller 130 may be configured to selectively close the first switch 121 or the second switch 122.
In some embodiments, the controller 130 may be configured to close the first switch 121 and open the second switch 122 in an onshore state of the vessel and close the second switch 122 and open the first switch 121 in an offshore state of the vessel.
In some embodiments, the load 400 shown in fig. 1 may include any powered device that may be implemented on a marine vessel, such as temperature regulation systems, lighting systems, and other distributed power sources. The motor 300 shown in fig. 1 may be a main drive motor of the vessel, which may be connected to a drive assembly of the vessel, such as a propeller or the like. Further, in some embodiments, the motor 300 may also be used as a generator to provide power to the load 400 in the event of an insufficient power supply to the load 400.
In some embodiments, the ac power grid 200 may be an infrastructure or a power grid that can be implemented on land. In general, a ship may utilize ac power grid 200 to provide power to load 400 while in an onshore location.
With the voltage converter 100 shown in fig. 1, it is possible to provide both voltage conversion between the shore ac grid and the load and voltage conversion between the shipboard motor and the load, thereby avoiding the conventional implementation of arranging converters for the shore ac grid and the shipboard motor, respectively, and thus significantly reducing the construction cost of the power supply system while improving the flexibility of the system.
In some embodiments, the voltage converter 100 may also include a sensor (not shown in FIG. 1). The sensor may be coupled to the load 400 to detect a voltage level of the load 400. The sensor may also be coupled to the controller 130 and transmit the detected voltage level of the load 400 to the controller 130. If the controller 130 determines that the voltage level of the load 400 detected by the sensor is lower than the threshold level, the first switch 121 is closed in a state where the ship is in shore, and the ac voltage from the ac grid 200 is converted into a dc voltage through the rectifying and inverting circuit 110 to supply power to the load 400. Alternatively, in a state where the ship is offshore, the second switch 122 is closed, and the alternating voltage from the motor 300 is converted into a direct voltage through the rectifying and inverting circuit 110 to supply power to the load 400.
In some embodiments, if the controller 130 determines that the voltage level of the load 400 detected by the sensor is higher than the threshold level, the first switch 121 is closed in a state where the ship is in shore, and the direct voltage from the load 400 is converted into an alternating voltage through the rectifying and inverting circuit 110 to discharge to the alternating current grid 200. Alternatively, in a state where the ship is offshore, the second switch 122 is closed, and the direct-current voltage from the load 400 is converted into an alternating-current voltage by the rectifying and inverting circuit 110 to discharge the motor 300.
By configuring the sensor, the voltage converter can automatically determine the voltage conversion modes of the inversion circuit and the rectification circuit so as to control the flow direction of the voltage, thereby improving the application efficiency and the flexibility of functions of the power supply system.
In some embodiments, the voltage converter 100 may also include a human-machine interaction interface (not shown in fig. 1). The human-machine-interaction interface may be coupled to the controller 130. If the human machine interface receives an instruction that the load 400 is to be charged, the first switch 121 is closed in a state where the ship is in shore, and the ac voltage from the ac grid 200 is converted into a dc voltage through the rectifying and inverting circuit 110 to supply power to the load 400. Alternatively, in a state where the ship is offshore, the second switch 122 is closed, and the alternating voltage from the motor 300 is converted into a direct voltage through the rectifying and inverting circuit 110 to supply power to the load 400.
In some embodiments, if the human machine interface receives an instruction that the load 400 is to be discharged, the first switch 121 is closed in a state where the ship is in shore, and the direct voltage from the load 400 is converted into an alternating voltage through the rectification and inversion circuit 110 to be discharged to the alternating current power grid 200. Alternatively, in a state where the ship is offshore, the second switch 122 is closed, and the direct-current voltage from the load 400 is converted into an alternating-current voltage by the rectifying and inverting circuit 110 to discharge the motor 300.
The voltage conversion mode of the inversion and rectification circuit can be determined by receiving an instruction from the man-machine interaction interface so as to control the flow direction of voltage, and therefore the application efficiency and the flexibility of functions of the power supply system are improved.
It should be understood that the voltage converter 100 is used as an ac-dc voltage converter in case of supplying power to the load 400, and the voltage converter 100 is used as a dc-ac voltage converter in case of discharging the load 400.
In addition, the embodiment of the application also provides a power supply system for the ship. Fig. 2 shows a schematic diagram of a power supply system 600 for a marine vessel comprising a converter according to an embodiment of the present disclosure.
As shown in fig. 2, the power supply system 600 may include the voltage converter 100. The power supply system 600 may further comprise an ac grid 200 coupled to the first switch 121 of the voltage converter 100 and a motor 300 coupled to the second switch 122 of the voltage converter 100. The motor 300 may for example be connected to a drive 500 of a ship. Furthermore, the power supply system 600 may further comprise a load 400 coupled to the rectifying and inverting circuit 110 of the voltage converter 100. In the power supply system 600, the voltage converter 100 performs voltage conversion between the ac power grid 200 and the load 400 when the first switch 121 is closed and performs voltage conversion between the motor 300 and the load 400 when the second switch 121 is closed.
By the description in conjunction with fig. 1, it is understood that the voltage conversion between the ac grid 200 and the load 400 and the direction of the voltage conversion between the ac grid 200 and the load 400 can be controlled based on the power supply demand of the load 400 and the on/off of the first switch and the second switch can be controlled according to the driving state of the ship.
Furthermore, in some embodiments, the power supply system 600 may further include a transformation and filtering circuit 210. The transforming and filtering circuit 210 is coupled between the ac grid 200 and the first switch 121 to filter and transform the ac voltage from the ac grid. In some embodiments, the filter may be, for example, an LCL filter or an LC filter.
Fig. 3 shows a schematic diagram of a power supply system 600' for a vessel comprising a converter according to an embodiment of the present disclosure. It can be seen that the power supply system 600' comprises a voltage converter 100, substantially the same as the power supply system 600 shown in fig. 2. The power supply system 600 may further comprise an ac grid 200 coupled to the first switch 121 of the voltage converter 100 and a motor 300 coupled to the second switch 122 of the voltage converter 100. Furthermore, the power supply system 600 may further comprise a load 400 coupled to the rectifying and inverting circuit 110 of the voltage converter 100.
A number of possible scenarios for load 400 are shown in fig. 3. For example, the load 400 may also comprise an auxiliary motor 410 on the vessel, which auxiliary motor 410 may be used, for example, for powering a temperature control system or a lighting system of the vessel. Further, load 400 may also include a distributed power generation system 420 on the vessel.
The embodiment of the disclosure can realize voltage conversion between an alternating current power grid and a load and between a motor and the load through the same voltage converter, thereby remarkably reducing the construction cost.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A voltage converter (100) for performing voltage conversion between an alternating current network (200) and a load (400), between an electric machine (300) and said load (400), comprising:
an inverter and rectifier circuit (110) for coupling to a load (400) via a direct current line;
a first switch (121) connected to the inverting and rectifying circuit (110), used to connect the alternating current grid (200), and capable of being closed to cause the inverting and rectifying circuit (110) to perform a voltage transformation between the alternating current grid (200) and the load (400);
a second switch (122) connected to the inverter and rectifier circuit (110) for connecting the motor (300) and capable of being closed to cause the inverter and rectifier circuit (110) to perform a voltage transformation between the motor (300) and the load (400), and
a controller (130) coupled to the first switch (121) and the second switch (122), respectively, and configured to selectively close one of the first switch (121) and the second switch (122).
2. The voltage converter (100) according to claim 1, characterized in that the voltage converter (100) is used for a vessel, wherein the controller is used for closing the first switch (121) and opening the second switch (122) in an onshore state of the vessel and for closing the second switch (122) and opening the first switch (121) in an offshore state of the vessel.
3. The voltage converter (100) of claim 1, further comprising a sensor coupled to the controller (130) and the load (400), the sensor to detect a voltage level of the load (400), the controller (130) being configured to, in response to the sensor detecting that the voltage level of the load (400) is below a first threshold level, perform at least one of:
-powering the load (400) by the alternating current grid (200) via the inverting and rectifying circuit (110) by closing the first switch (121); and
-causing the motor (300) to supply power to the load (400) via the inverter and rectifier circuit (110) by closing the second switch (122).
4. The voltage converter (100) of claim 1, further comprising a sensor coupled to the controller (130) and the load (400), the sensor to detect a voltage level of the load (400), the controller (130) being configured to, in response to the sensor detecting that the voltage level of the load (400) is above a second threshold level, perform at least one of:
-discharging the load (400) to the alternating current grid (200) via the inverter and rectifier circuit (110) by closing the first switch (121); and
-discharging the inverter and rectifier circuit (110) to the motor (300) via the inverter and rectifier circuit (110) by closing the second switch (122).
5. The voltage converter (100) of claim 1, further comprising a human machine interaction interface coupled to the controller (130), the controller (130) being configured to, in response to receiving an instruction through the human machine interaction interface that the load (400) is to be charged, perform at least one of:
-powering the load (400) by the alternating current grid (200) via the inverting and rectifying circuit (110) by closing the first switch (121); and
-causing the motor (300) to supply power to the load (400) via the inverter and rectifier circuit (110) by closing the second switch (122).
6. The voltage converter (100) of claim 1, further comprising a human machine interaction interface coupled to the controller (130), the controller (130) being configured to, in response to receiving an instruction through the human machine interaction interface that the load (400) is to be discharged, perform at least one of:
-discharging the load (400) to the alternating current grid (200) via the inverter and rectifier circuit (110) by closing the first switch (121); and
-discharging the inverter and rectifier circuit (110) to the motor (300) via the inverter and rectifier circuit (110) by closing the second switch (122).
7. The voltage converter (100) according to claim 1, wherein the voltage converter (100) comprises a dc-ac voltage converter and an ac-dc voltage converter.
8. A power supply system for a marine vessel, comprising:
a voltage converter (100) according to any of claims 1 to 7;
an alternating current grid coupled to a first switch (121) of the voltage converter (100);
a motor (300) coupled to a second switch (122) of the voltage converter (100); and
a load (400) coupled to an inverting and rectifying circuit (110) of the voltage converter (100).
9. The power supply system according to claim 8, characterized in that the first switch (121) is closed in an onshore state of the vessel and the second switch (122) is closed in an offshore state of the vessel.
10. The power supply system according to claim 8, further comprising a transformation and filtering circuit (210) coupled between the alternating current grid (200) and the first switch (121) and used for transforming and filtering an alternating current voltage from the alternating current grid (200) or to be provided to the alternating current grid (200).
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| CN201920926365.5U CN210351037U (en) | 2019-06-19 | 2019-06-19 | Voltage converter and power supply system for ship |
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| CN201920926365.5U CN210351037U (en) | 2019-06-19 | 2019-06-19 | Voltage converter and power supply system for ship |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE2151299A1 (en) * | 2021-10-25 | 2023-04-26 | Berg Propulsion Production Ab | Electrical power for marine vessels |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE2151299A1 (en) * | 2021-10-25 | 2023-04-26 | Berg Propulsion Production Ab | Electrical power for marine vessels |
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