Three-phase power supply system for uninterrupted operation of elevator

Abstract

The utility model relates to the technical field of elevators, in particular to a three-phase power supply system for uninterrupted operation of an elevator, which comprises a power grid, a contactor unit, a rectifying unit, an energy storage converter unit and accessory equipment, when the contactor unit is in a conducting position, the power grid supplies power to the power equipment, the accessory equipment and the energy storage converter unit at the same time; and when the contactor unit is in a disconnected position, the energy storage converter unit supplies power to the power equipment and the accessory equipment at the same time. When the power grid is at the trough electricity price or the output voltage of the power grid is relatively high, the contactor unit is switched to the conduction position, so that the energy storage conversion unit can store the electric energy. And when the power grid is at the peak electricity price or the output voltage of the power grid is the same as the voltage output by the energy storage converter unit, the power grid is switched to the off position, so that the energy storage converter unit can be used for supplying power to power equipment and accessory equipment, the power consumption cost can be reduced, and the use cost can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, and particularly relates to a three-phase power supply system for uninterrupted operation of an elevator. Background Art

[0002] At present, elevators are usually directly connected to a DC bus for power supply. In order to save energy and ensure the normal operation of the elevator during a power outage, some elevators are provided with energy storage devices. The energy storage device is connected in parallel to the DC bus. It can not only store electric energy during the off-peak electricity price period of the power grid and supply power during the peak electricity price period of the power grid, enabling the power equipment of the elevator to operate normally, but also store the energy output when the power equipment is in the power generation state, thereby achieving the effects of energy conservation and cost savings.

[0003] However, in addition to the power equipment, an elevator also has other auxiliary equipment that needs to be powered, such as control devices, communication devices, and device equipment involved in elevator operation. These auxiliary equipment need to be powered by the DC bus and will also consume a lot of electric energy during the peak electricity price period of the power grid. Summary of the Utility Model

[0004] In view of this, the utility model provides a three-phase power supply system for uninterrupted operation of an elevator to solve the problem that the auxiliary equipment of the elevator needs to be powered by the DC bus and will also consume a lot of electric energy during the peak electricity price period of the power grid.

[0005] In a first aspect, the utility model provides a three-phase power supply system for uninterrupted operation of an elevator. The elevator is provided with power equipment and auxiliary equipment. The three-phase power supply system includes:

[0006] The power grid;

[0007] A contactor unit, the first end of the contactor unit is connected to the output side of the power grid, and the second end of the contactor unit has a conducting position and a disconnecting position with respect to the first end;

[0008] A rectifier unit, having a first side and a second side; the first side of the rectifier unit is connected to the second end of the contactor unit, and the second side of the rectifier unit is connected to the power equipment;

[0009] An energy storage inverter unit, connected to the second side of the rectifier unit;

[0010] The auxiliary equipment, one end of the auxiliary equipment is connected to the second end of the contactor unit, and the other end of the auxiliary equipment is connected to the energy storage inverter unit;

[0011] When the contactor unit is in the conducting position, the power grid supplies power to the power equipment, the auxiliary equipment, and the energy storage inverter unit simultaneously;

[0012] The contactor unit is in the off position, and the energy storage and conversion unit supplies power to the power equipment and the auxiliary equipment simultaneously.

[0013] Advantages: In the embodiment of the present utility model, by setting the energy storage and conversion unit, when the power grid is at the valley electricity price or the output voltage of the power grid is relatively high, the contactor unit can be switched to the on position, so that the energy storage and conversion unit can store electrical energy, and at the same time the power grid can supply power to the power equipment and auxiliary equipment of the elevator simultaneously. When the power grid is at the peak electricity price or the output voltage of the power grid is the same as the output voltage of the energy storage and conversion unit, the contactor unit can be switched to the off position, so that the energy storage and conversion unit can supply power to the power equipment and auxiliary equipment simultaneously, thereby reducing the electrical energy consumed during the peak period of the power grid, reducing the power consumption cost, and saving the use cost.

[0014] In an optional embodiment, the power grid is a three-phase power grid, and the auxiliary equipment uses three-phase electricity; the rectification unit outputs direct current to the power equipment.

[0015] In an optional embodiment, the energy storage and conversion unit is provided with a DC terminal and a three-phase terminal;

[0016] The DC terminal is connected to the second side of the rectification unit;

[0017] The three-phase terminal is connected to the auxiliary equipment;

[0018] The contactor unit is in the on position, the power grid supplies power to the energy storage and conversion unit through the DC terminal, and the energy storage and conversion unit stores energy;

[0019] The contactor unit is in the off position, the energy storage and conversion unit supplies power to the power equipment through the DC terminal to form a first power supply loop; and the energy storage and conversion unit supplies power to the auxiliary equipment through the three-phase terminal to form a second power supply loop.

[0020] In an optional embodiment, the energy storage and conversion unit includes:

[0021] A bidirectional converter, the first end of the bidirectional converter is connected to the second side of the rectification unit;

[0022] An energy storage battery pack, the first end of the energy storage battery pack is connected to the second end of the bidirectional converter, and the second end of the energy storage battery pack is connected to the first end of a three-phase converter;

[0023] The three-phase converter, the second end of the three-phase converter is connected to the auxiliary equipment;

[0024] The contactor unit is in the conducting position, the power grid supplies power to the energy storage stack through the bidirectional converter, and the energy storage stack stores energy;

[0025] The contactor unit is in the off position, the energy storage stack supplies power to the power equipment through the bidirectional converter to form the first power supply loop; and the energy storage stack supplies power to the auxiliary equipment through the three-phase converter to form the second power supply loop.

[0026] In an optional embodiment, the energy storage stack includes batteries or supercapacitors connected in series and / or in parallel, and a control circuit for controlling the operation of the energy storage stack.

[0027] In an optional embodiment, power electronic switches are provided inside the bidirectional converter and / or the three-phase converter, and the power electronic switches include, but are not limited to, full-bridge topologies and half-bridge circuit topologies.

[0028] In an optional embodiment, the switching devices used in the power electronic switches include, but are not limited to, MOS transistors, IGBT devices, and silicon carbide devices.

[0029] In an optional embodiment, the contactor unit includes three contactors, one end of each contactor is respectively connected to a power supply terminal of the three-phase power grid, and the other end of each contactor is respectively connected to three AC input terminals on the first side of the rectifier unit.

[0030] In an optional embodiment, the second side of the rectifier unit is connected to the power equipment through a DC bus, and the energy storage converter unit is connected to the DC bus.

[0031] In an optional embodiment, the power equipment at least includes a drive converter and a traction machine of an elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic diagram of a three-phase power supply system for uninterrupted operation of an elevator in an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of the three-phase power supply system in an embodiment of the present invention when the power grid supplies power to the elevator;

[0035] Figure 3 This is a schematic diagram of the energy storage and conversion unit of the three-phase power supply system in the embodiment of the present utility model for supplying power to an elevator.

[0036] Description of the reference numerals in the drawings:

[0037] 1. Contactor unit; 2. Rectifier unit; 3. DC bus; 4. Power equipment; 5. Auxiliary equipment; 6. Energy storage and conversion unit; 61. Bidirectional converter; 62. Energy storage stack; 63. Three-phase converter; M1. Traction machine. Specific implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0041] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0042] At present, elevators are usually directly connected to the DC bus and powered by the DC bus. To save energy and ensure the normal operation of the elevator during power outages, some elevators are equipped with energy storage devices. The energy storage device is connected in parallel to the DC bus. It can not only store electrical energy during the off-peak electricity price period of the power grid and supply power during the peak period of the power grid, enabling the power equipment of the elevator to operate normally, but also store the energy output when the power equipment is in the power generation state, thus achieving the effects of energy conservation and cost savings. However, in addition to the power equipment, there are other auxiliary equipment in the elevator that needs to be powered, such as control devices, communication devices, and device equipment involved in the operation of the elevator. These auxiliary equipment require power supply from the DC bus and also consume a lot of electrical energy during the peak period of the power grid.

[0043] In view of this, the present utility model provides a three-phase power supply system for uninterrupted operation of an elevator to solve the problem that the auxiliary equipment of the elevator needs to be powered by the DC bus and also consumes a lot of electrical energy during the peak period of the power grid.

[0044] The following combines Figures 1 to 3 , to describe the embodiments of the present utility model.

[0045] According to an embodiment of the present utility model, on the one hand, a three-phase power supply system for uninterrupted operation of an elevator is provided. The elevator is provided with a power equipment 4 and auxiliary equipment 5. The three-phase power supply system includes a power grid, a contactor unit 1, a rectifier unit 2, and an energy storage inverter unit 6.

[0046] Specifically, in this embodiment, the power grid is the commercial power used in daily life and is alternating current. Therefore, the rectifier unit 2 is required to rectify it so that the power equipment 4 of the elevator can work normally. The first end of the contactor unit 1 is connected to the output side of the power grid, and the second end of the contactor unit 1 has a conducting position and a disconnecting position with respect to the first end of the contactor unit 1. In this embodiment, the contactor unit 1 is connected to the external power grid. The contactor unit 1 is a key component for power supply switching and has two working states, namely conducting and disconnecting. In the conducting state, the power of the power grid can not only supply power to the power equipment 4 and the auxiliary equipment 5, but also charge the energy storage inverter unit 6.

[0047] Furthermore, in this embodiment, the rectifier unit 2 is provided with a first side and a second side. The first side of the rectifier unit 2 is connected to the second end of the contactor unit 1, and the second side of the rectifier unit 2 is connected to the power equipment 4. The rectifier unit 2 is located between the contactor unit 1 and the power equipment 4, and its function is to convert the alternating current of the power grid into direct current to meet the power supply requirements of the power equipment 4 of the elevator.

[0048] Further, in this embodiment, the energy storage and conversion unit 6 is connected to the second side of the rectification unit 2. One end of the accessory device 5 is connected to the second end of the contactor unit 1, and the other end of the accessory device 5 is connected to the energy storage and conversion unit 6. When storing energy, the energy storage and conversion unit 6 can convert the form of electrical energy output by the power grid and then store it. When outputting, it can first convert the internally stored electrical energy and then output it externally. In this way, the output electrical energy can meet the usage requirements of the power device 4 and the accessory device 5.

[0049] During the actual working process, when the contactor unit 1 is in the conducting position, the power grid supplies power to the power device 4, the accessory device 5, and the energy storage and conversion unit 6 simultaneously. When the contactor unit 1 is in the disconnected position, the energy storage and conversion unit 6 supplies power to the power device 4 and the accessory device 5 simultaneously.

[0050] With such a setting, in the embodiment of the present utility model, by setting the energy storage and conversion unit 6, when the power grid is at a valley electricity price or the output voltage of the power grid is relatively high, the contactor unit 1 can be switched to the conducting position, so that the energy storage and conversion unit 6 can store electrical energy, and at the same time, the power grid can supply power to the power device 4 and the accessory device 5 of the elevator simultaneously. When the power grid is at a peak electricity price or the output voltage of the power grid is the same as the output voltage of the energy storage and conversion unit 6, the contactor unit 1 can be switched to the disconnected position, so that the energy storage and conversion unit 6 can supply power to the power device 4 and the accessory device 5 simultaneously, thereby reducing the electrical energy consumed during the peak period of the power grid, reducing the power consumption cost, and saving the usage cost. Moreover, in case of power outage and other situations, it can ensure the normal operation of the elevator, thus ensuring the life safety of passengers and improving the overall safety of the elevator.

[0051] Further, in an optional implementation manner, the power grid is a three-phase power grid, the accessory device 5 uses three-phase electricity, and the rectification unit 2 outputs direct current to the power device 4. Therefore, the electrical energy parameters used by the accessory device 5 and the power device 4 are different. When the energy storage and conversion unit 6 supplies power to the accessory device 5 and the power device 4, it needs to be converted separately and then output externally respectively.

[0052] Further, in an optional implementation manner, the energy storage and conversion unit 6 is provided with a DC end and a three-phase end. The DC end is connected to the second side of the rectification unit 2, and the three-phase end is connected to the accessory device 5.

[0053] During the actual working process, the contactor unit 1 is in the conducting position, and the power grid supplies power to the energy storage converter unit 6 through the DC terminal, and the energy storage converter unit 6 stores energy. When the contactor unit 1 is in the disconnected position, the energy storage converter unit 6 supplies power to the power equipment 4 through the DC terminal, forming a first power supply loop. And the energy storage converter unit 6 supplies power to the auxiliary equipment 5 through the three-phase terminal, forming a second power supply loop.

[0054] Further, in an optional embodiment, the energy storage converter unit 6 includes a bidirectional converter 61, an energy storage battery pack 62, and a three-phase converter 63.

[0055] In the embodiment of the present utility model, the first end of the bidirectional converter 61 is connected to the second side of the rectifier unit 2, the first end of the energy storage battery pack 62 is connected to the second end of the bidirectional converter 61, the second end of the energy storage battery pack 62 is connected to the first end of the three-phase converter 63, and the second end of the three-phase converter 63 is connected to the auxiliary equipment 5. The bidirectional converter 61 is a bidirectional DC / DC converter, and the three-phase converter 63 is a three-phase DC / AC converter.

[0056] During the actual working process, when the contactor unit 1 is in the conducting position, the power grid supplies power to the energy storage battery pack 62 through the bidirectional converter 61, and the energy storage battery pack 62 stores energy; when the contactor unit 1 is in the disconnected position, the energy storage battery pack 62 supplies power to the power equipment 4 through the bidirectional converter 61, forming the first power supply loop; and the energy storage battery pack 62 supplies power to the auxiliary equipment 5 through the three-phase converter 63, forming the second power supply loop.

[0057] Further, in an optional embodiment, the energy storage battery pack 62 includes batteries or supercapacitors connected in series and / or in parallel, and a control circuit for controlling the operation of the energy storage battery pack 62.

[0058] Further, in an optional embodiment, power electronic switches are provided inside the bidirectional converter 61 and / or the three-phase converter 63, and the power electronic switches include, but are not limited to, full-bridge topologies and half-bridge circuit topologies.

[0059] Of course, this embodiment is only an example of the type of power electronic switches, but it is not limited thereto. Those skilled in the art can make changes according to the actual situation as long as the same technical effects can be achieved.

[0060] Further, in an optional embodiment, the switching devices used in the power electronic switches include, but are not limited to, MOS transistors, IGBT devices, and silicon carbide devices.

[0061] Further, in an alternative embodiment, the contactor unit 1 includes three contactors. One end of each contactor is respectively connected to a power supply terminal of the three-phase power grid, and the other end of each contactor is respectively connected to three AC input terminals on the first side of the rectifier unit 2.

[0062] Further, in an alternative embodiment, the second side of the rectifier unit 2 is connected to the power equipment 4 through the DC bus 3, and the energy storage converter unit 6 is connected to the DC bus 3. Thus, the power grid and the energy storage converter unit 6 can supply power through the DC bus 3.

[0063] Further, in an alternative embodiment, the power equipment 4 at least includes a drive converter of the elevator and a traction machine M1.

[0064] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A three-phase power supply system for uninterrupted operation of an elevator, characterized in that, The elevator is provided with a power device (4) and auxiliary equipment (5), and the three-phase power supply system includes: The power grid; A contactor unit (1), a first end of the contactor unit (1) is connected to an output side of the power grid, and a second end of the contactor unit (1) has a conducting position and a disconnecting position with respect to the first end of the contactor unit (1); A rectifying unit (2), having a first side and a second side; the first side of the rectifying unit (2) is connected to the second end of the contactor unit (1), and the second side of the rectifying unit (2) is connected to the power device (4); An energy storage and conversion unit (6), connected to the second side of the rectifying unit (2); The auxiliary equipment (5), one end of the auxiliary equipment (5) is connected to the second end of the contactor unit (1), and the other end of the auxiliary equipment (5) is connected to the energy storage and conversion unit (6); When the contactor unit (1) is in the conducting position, the power grid supplies power to the power device (4), the auxiliary equipment (5), and the energy storage and conversion unit (6) simultaneously; When the contactor unit (1) is in the disconnecting position, the energy storage and conversion unit (6) supplies power to the power device (4) and the auxiliary equipment (5) simultaneously.

2. The three-phase power supply system according to claim 1, wherein The power grid is a three-phase power grid, and the auxiliary equipment (5) uses three-phase electricity; the rectifying unit (2) outputs direct current to the power device (4).

3. The three-phase power supply system according to claim 2, wherein The energy storage and conversion unit (6) is provided with a DC terminal and a three-phase terminal; The DC terminal is connected to the second side of the rectifying unit (2); The three-phase terminal is connected to the auxiliary equipment (5); When the contactor unit (1) is in the conducting position, the power grid supplies power to the energy storage and conversion unit (6) through the DC terminal, and the energy storage and conversion unit (6) stores energy; When the contactor unit (1) is in the disconnecting position, the energy storage and conversion unit (6) supplies power to the power device (4) through the DC terminal, forming a first power supply loop; and the energy storage and conversion unit (6) supplies power to the auxiliary equipment (5) through the three-phase terminal, forming a second power supply loop.

4. The three-phase power supply system according to claim 3, wherein The energy storage and conversion unit (6) includes: A bidirectional converter (61), a first end of the bidirectional converter (61) is connected to the second side of the rectifying unit (2); An energy storage battery stack (62), a first end of the energy storage battery stack (62) is connected to a second end of the bidirectional converter (61), and a second end of the energy storage battery stack (62) is connected to a first end of a three-phase converter (63); The three-phase converter (63), a second end of the three-phase converter (63) is connected to the auxiliary equipment (5); When the contactor unit (1) is in the conducting position, the power grid supplies power to the energy storage battery stack (62) through the bidirectional converter (61), and the energy storage battery stack (62) stores energy; When the contactor unit (1) is in the disconnecting position, the energy storage battery stack (62) supplies power to the power device (4) through the bidirectional converter (61), forming the first power supply loop; and the energy storage battery stack (62) supplies power to the auxiliary equipment (5) through the three-phase converter (63), forming the second power supply loop.

5. The three-phase power supply system according to claim 4, wherein The energy storage battery (62) includes batteries or supercapacitors connected in series and / or in parallel, and a control circuit for controlling the operation of the energy storage battery (62).

6. The three-phase power supply system according to claim 4, characterized in that, Power electronic switches are provided inside the bidirectional converter (61) and / or the three-phase converter (63), and the power electronic switches include, but are not limited to, a full-bridge topology and a half-bridge circuit topology.

7. The three-phase power supply system according to claim 6, characterized in that, The switching devices used in the power electronic switches include, but are not limited to, MOS transistors, IGBT devices, and silicon carbide devices.

8. The three-phase power supply system according to any one of claims 2 to 7, characterized in that, The contactor unit (1) includes three contactors. One end of each contactor is respectively connected to a power supply terminal of the three-phase power grid, and the other end of each contactor is respectively connected to three AC input terminals on the first side of the rectifier unit (2).

9. The three-phase power supply system according to any one of claims 2 to 7, characterized in that The second side of the rectifier unit (2) is connected to the power equipment (4) through a DC bus (3), and the energy storage converter unit (6) is connected to the DC bus (3).

10. The three-phase power supply system according to any one of claims 1 to 7, characterized in that, The power equipment (4) at least includes a drive converter of an elevator and a traction machine (M1).

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