Power supply system

Abstract

The embodiment of the present application provides a power supply system, comprising: a direct current boosting subsystem, a power supply bus, and N power supply conversion subsystems; wherein N>2; the direct current boosting subsystem comprises: at least two rectifier boosting devices, the rectifier boosting devices are arranged in a target area, the rectifier boosting devices are connected through the power supply bus, constitute a direct current loop circuit, and are used for converting alternating current into first direct current; each power supply conversion subsystem is arranged in a corresponding area, is connected with the power supply bus, and is used for providing a load in the area with first direct current after conversion processing. The embodiment of the present application converts commercial power into first direct current through the rectifier boosting device, transports the first direct current to each power supply conversion subsystem through the power supply bus, and converts the first direct current into required direct current or alternating current for the load, so that the capacity of each station is reduced, and the power demand of the station is optimized; the cost is low, and the later maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a power supply system. Background Technology

[0002] The existing power supply system for the Skybus includes equipment such as 10kV high-voltage cabinets, transformers, 400V low-voltage cabinets, and AC / DC power supply panels at each station. The stations are connected by a 10kV AC ring network system. The 10kV ring network cables between stations are numerous and costly. Each station needs to be equipped with high-voltage cabinets, transformers, and low-voltage cabinets. The transformers have high power requirements, but their utilization rate is extremely low when the Skybus is small in size. Summary of the Invention

[0003] This application provides a power supply system to optimize power demand.

[0004] This application provides a power supply system, including: a DC boost subsystem, a power supply bus, and N power conversion subsystems; wherein N>2;

[0005] The DC boost subsystem includes at least two rectifier boost units deployed in the target area. The rectifier boost units are connected by a power supply bus to form a DC ring network circuit, which is used to convert AC power into the first DC power.

[0006] Each power conversion subsystem is deployed in its corresponding area and connected to the power supply bus to convert the first DC power and supply it to the loads in the area.

[0007] In one embodiment, the rectifier boost device includes: an AC input unit, a first conversion unit, and a first output unit; a first terminal of the AC input unit is connected to AC power, and a second terminal of the AC input unit is connected to a first terminal of the first conversion unit; a second terminal of the first conversion unit is connected to a first terminal of the first output unit; and a second terminal of the first output unit is connected to a power supply bus.

[0008] The AC input unit is used to convert AC power into DC power; the first conversion unit is used to convert the DC power output from the AC input unit into a first DC power; and the first output unit is used to transmit the first DC power to the power supply conversion subsystem.

[0009] In one embodiment, the first conversion unit includes at least one conversion subunit, a first end of which is connected to a second end of the AC input unit; the second end of which is connected to the power supply bus.

[0010] The converter subunit is used to output the first DC power.

[0011] In one of the embodiments, the converting subunit comprises a plurality of DC / DC modules, the first ends of the DC / DC modules are connected in parallel with the second ends of the AC incoming line unit; and the second ends of the DC / DC modules are connected with the power supply bus.

[0012] In one of the embodiments, the converting subunit is further provided with a first contactor and a first fuse;

[0013] The first contactor is arranged at the first end of the converting subunit, and is used for controlling the on and off of the converting subunit;

[0014] The first fuse is arranged at the first end of the converting subunit, and is used for protecting the converting subunit.

[0015] In one of the embodiments, the power supply bus comprises a positive bus, a negative bus and a neutral bus; and the rectifying and boosting device further comprises a first grounding unit; the first end of the first grounding unit is connected with the neutral bus, and the second end of the first grounding unit is grounded;

[0016] The first grounding unit comprises a second contactor and a first current sensor; the first end of the first current sensor is the first end of the first grounding unit, and the second end of the first current sensor is connected with the first end of the second contactor; and the second end of the first current sensor is the second end of the first grounding unit.

[0017] The first current sensor is used for detecting the current of the neutral bus; and the second contactor is used for being closed when the current flows through the neutral bus, so as to ensure that the reference potential of the neutral bus is zero.

[0018] In one of the embodiments, the first output unit comprises a second current sensor, a third current sensor, a first circuit breaker and a second circuit breaker; the second current sensor is connected with the positive bus through the first circuit breaker; and the third current sensor is connected with the negative bus through the second circuit breaker.

[0019] The second current sensor is used for detecting the current of the positive bus; the first circuit breaker is used for controlling the on and off of the positive bus; the third current sensor is used for detecting the current of the negative bus; and the second circuit breaker is used for controlling the on and off of the negative bus.

[0020] In one of the embodiments, the AC incoming line unit comprises a plurality of rectifying modules and a first DC bus; the first ends of the rectifying modules are connected with AC power, and the second ends of the rectifying modules are connected with the first DC bus.

[0021] The rectifying modules are used for converting AC power into DC power.

[0022] In one of the embodiments, the AC incoming line unit further comprises a third circuit breaker and a third contactor.

[0023] The first end of the third circuit breaker is the first end of the AC incoming line unit, and the second end of the third circuit breaker is connected with the first end of the third contactor; the second end of the third contactor is connected with the rectifier module.

[0024] In one of the embodiments, the rectifier and booster device further comprises a first power supply unit; the first end of the first power supply unit is connected with the AC incoming line unit, and the second end of the first power supply unit is connected with the control unit; the first power supply unit is used to supply power to the control unit;

[0025] The control unit is used to control the rectifier and booster device and the power supply conversion subsystem.

[0026] In one of the embodiments, the first end of the first power supply conversion subsystem is connected with a rectifier and booster device, and the second end of the first power supply conversion subsystem is connected with the first end of the next power supply conversion subsystem.

[0027] The second end of the last power supply conversion subsystem is connected with another rectifier and booster device.

[0028] In one of the embodiments, the power supply conversion subsystem comprises an incoming and outgoing line unit, a second conversion unit and a second output unit; the first end of the incoming and outgoing line unit is the first end of the power supply conversion subsystem, the second end of the incoming and outgoing line unit is the second end of the power supply conversion subsystem, and the third end of the incoming and outgoing line unit is connected with the first end of the second conversion unit; the second end of the second conversion unit is connected with the first end of the second output unit.

[0029] The incoming and outgoing line unit is used to supply power to the power supply conversion subsystem; the second conversion unit is used to convert the first direct current into the second direct current; and the second output unit is used to supply power to the load in the station site.

[0030] In one of the embodiments, the incoming and outgoing line unit further comprises a second direct current bus, a third direct current bus, a pre-charging module, and a fourth contactor and a fifth contactor arranged between the second direct current bus and the third direct current bus.

[0031] The first end of the second direct current bus is the first end of the incoming and outgoing line unit, and the second end of the second direct current bus is connected with the third direct current bus through the fourth contactor and the fifth contactor.

[0032] The first end of the pre-charging module is connected with the second end of the second direct current bus, and the second end of the pre-charging module is connected with the first end of the third direct current bus.

[0033] In one of the embodiments, the third direct current bus comprises a positive bus, a negative bus and a neutral bus.

[0034] The access line unit further comprises a second grounding unit, a first end of the second grounding unit is connected with the neutral bus, and a second end of the second grounding unit is grounded; the second grounding unit ensures that the reference potential of the neutral bus is zero.

[0035] In one of the embodiments, the second conversion unit comprises at least four DC / DC modules, wherein a first end of the DC / DC module is connected in series with the third end of the access line unit, and a second end of the DC / DC module is output in parallel to the second output unit.

[0036] In one of the embodiments, the second output unit comprises an inverter module, a first end of the inverter module is connected with the second end of the second conversion unit, and a second end of the inverter module is connected with the AC load;

[0037] The inverter module is used to convert the second DC into the first AC to supply power to the AC load.

[0038] In one of the embodiments, the power supply conversion subsystem further comprises a second power supply unit, a first end of the second power supply unit is connected with the second end of the second conversion unit, and a second end of the second power supply unit is connected with the system load;

[0039] The second power supply unit is used to convert the second DC into the target DC to supply power to the system load.

[0040] In one of the embodiments, the power supply conversion subsystem further comprises a charging unit, a first end of the charging unit is connected with the second end of the second conversion unit, and a second end of the charging unit is connected with the energy storage device;

[0041] The charging unit is used to charge the energy storage device.

[0042] In one of the embodiments, the power supply conversion subsystem further comprises a third power supply unit, a first end of the third power supply unit is connected with the energy storage device, and a second end of the third power supply unit is connected with a control power supply; the third power supply unit supplies power to the control power supply; and the control power supply is used to supply power to the system load in the station site.

[0043] The embodiment of the present application provides a power supply system, comprising: a direct current boosting subsystem, a power supply bus, and N power supply conversion subsystems; wherein N>2; the direct current boosting subsystem comprises: at least two rectifier boosting devices, the rectifier boosting devices are arranged in a target area, the rectifier boosting devices are connected through the power supply bus, form a direct current loop circuit, and are used for converting alternating current into first direct current; each power supply conversion subsystem is arranged in a corresponding area, is connected with the power supply bus, and is used for providing a load in the area after conversion processing of the first direct current. The rectifier boosting device is used for converting commercial power into the first direct current, the power supply bus is used for delivering the first direct current to each power supply conversion subsystem, the power supply conversion subsystem is used for converting the first direct current into required direct current or alternating current for the load, the capacity of each station is reduced, and the power demand of the station is optimized; only two power supply buses are needed for power distribution between two power supply conversion subsystems, cost is low, and the volume is small; the equipment is simple, and the later maintenance cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0044] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0045] Figure 1 A structural schematic diagram of a power supply system provided by an embodiment of the present application is shown in the figure.

[0046] Figure 2 A structural schematic diagram of a power supply system provided by another embodiment of the present application is shown in the figure.

[0047] Figure 3 A structural schematic diagram of a rectifier boosting device provided by an embodiment of the present application is shown in the figure.

[0048] Figure 4 A structural schematic diagram of an alternating current incoming line unit provided by an embodiment of the present application is shown in the figure.

[0049] Figure 5 A structural schematic diagram of a conversion subunit provided by an embodiment of the present application is shown in the figure.

[0050] Figure 6 A structural schematic diagram of a first grounding unit provided by an embodiment of the present application is shown in the figure.

[0051] Figure 7 A structural schematic diagram of a first output unit provided by an embodiment of the present application is shown in the figure.

[0052] Figure 8 A structural schematic diagram of a first power supply unit provided by an embodiment of the present application is shown in the figure.

[0053] Figure 9 A structural schematic diagram of a power supply conversion subsystem provided by an embodiment of the present application is shown in the figure.

[0054] Figure 10 A structure diagram of a second output unit according to an embodiment of the present application is provided.

[0055] Figure 11 A structure diagram of a second power supply unit according to an embodiment of the present application is provided.

[0056] Figure 12 A structure diagram of a charging unit according to an embodiment of the present application is provided.

[0057] Figure 13 A structure diagram of a third power supply unit according to an embodiment of the present application is provided.

[0058] Reference signs:

[0059] 10, DC boost subsystem; 1100, AC incoming line unit; 1200, first conversion unit; 1300, first output unit; 1400, first grounding unit; 1500, first power supply unit; 20, power conversion subsystem; 210, incoming / outgoing line unit; 220, second conversion unit; 230, second output unit; 240, second grounding unit; 250, second power supply unit; 260, charging unit; 270, third power supply unit.

[0060] The specific embodiments of the present application have been shown through the above-described drawings, and will be described in more detail hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application by any means, but to explain the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0061] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The same or similar components are denoted by the same or similar reference numerals throughout the drawings and the following description. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0062] The existing cloud bus power supply system includes 10kV high-voltage cabinets, transformers, 400V low-voltage cabinets, AC / DC screens and other equipment in each station power supply system. An AC 10kV looped network system is used between each station, which has the disadvantages of a large number of 10kV looped network cables between each station, high cost, the need for high-voltage cabinets, transformers and low-voltage cabinets in each station, high power demand for transformers, but very low utilization rate when facing small cloud bus operation.

[0063] The power supply system provided in this application converts mains power into first DC power through a rectifier and booster device, and then transmits the first DC power to each power conversion subsystem through a power supply bus. The power conversion subsystem converts the first DC power into the required DC or AC power for the load, reducing the capacity of each station and optimizing the station's power demand. Only two power supply buses are needed for power distribution between the two power conversion subsystems, resulting in low cost and small size. The equipment is simple, reducing subsequent maintenance costs.

[0064] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0065] like Figure 1 As shown, Figure 1 This is a schematic diagram of a power supply system provided in an embodiment of this application. The power supply system includes: a DC boost subsystem 10, a power supply bus, and N power conversion subsystems 20; wherein N>2; the DC boost subsystem 10 includes: at least two rectifier boost devices, which are deployed in the target area and connected to each other through the power supply bus to form a DC ring network circuit for converting AC power into first DC power; each power conversion subsystem 20 is deployed in a corresponding area and connected to the power supply bus for converting the first DC power and supplying it to the load of the area.

[0066] The figure only shows two rectifier boosting devices, rectifier boosting device 1 and rectifier boosting device 2, as examples. In other embodiments, the DC boosting subsystem 10 includes at least two rectifier boosting devices. This application converts mains power to first DC power through rectifier boosting devices, and then transports the first DC power to each power conversion subsystem 20 through the power supply bus. The power conversion subsystem 20 converts the first DC power into the required DC or AC power for the load, reducing the capacity of each station and optimizing the station's power demand. Only two power supply buses are needed for power distribution between the two power conversion subsystems 20, resulting in low cost and small size; the equipment is simple, reducing later maintenance costs.

[0067] This application can be applied not only to the Skybus system, but also to other large-scale facilities.

[0068] In one embodiment, the two rectifier boost devices in the DC boost subsystem 10 can be deployed in the same area or in different areas. Specifically, in the first deployment scenario, the two rectifier boost devices can be deployed in the same area as the first power conversion subsystem 20 in the DC ring network loop; in the second deployment scenario, one rectifier boost device is deployed in the same area as the first power conversion subsystem 20 in the DC ring network loop, and the other rectifier boost device is deployed in the same area as the last power conversion subsystem 20 in the DC ring network loop. When the DC boost subsystem 10 includes three or more rectifier boost devices, the remaining rectifier boost devices can be deployed in the same area as the power conversion subsystem 20 located in the middle of the DC ring network loop, depending on the actual situation. In other embodiments, the rectifier boost devices of the DC boost subsystem 10 can also be deployed independently. This application does not limit this, and the deployment areas of the rectifier boost devices and the power conversion subsystem 20 can be adjusted according to the actual situation. Specifically, in Figure 1 The location of the rectifier boost device and power conversion system in the middle is just one example.

[0069] like Figure 2 As shown, Figure 2 This is a schematic diagram of a power supply system provided in another embodiment of this application. This example is applied to the Skybus train system, using a ±1500V DC ring network. That is, the first DC voltage is ±1500V. The rectifier and boost device in the DC boost subsystem 10 converts the 380V mains power into ±1500V DC voltage, which is then connected to the power conversion subsystem 20 via the power supply bus to provide the first DC voltage to the loads in the area after conversion. This application is only one example; the first DC voltage can be set to other amplitudes according to actual needs, and this application does not limit this. N power conversion subsystems 20 are used in... Figure 2 The term is represented as the first power conversion subsystem, the second power conversion subsystem, ..., the Nth power conversion subsystem.

[0070] In one embodiment, such as Figure 3 As shown, Figure 3A structure diagram of a rectifier and booster device is provided in an embodiment of the present application. The rectifier and booster device comprises an AC incoming line unit 1100, a first conversion unit 1200, and a first output unit 1300. The first end of the AC incoming line unit 1100 is connected to AC power, and the second end of the AC incoming line unit 1100 is connected to the first end of the first conversion unit 1200. The second end of the first conversion unit 1200 is connected to the first end of the first output unit 1300. The second end of the first output unit 1300 is connected to a power supply bus. The AC incoming line unit 1100 is configured to convert AC power into DC power. The first conversion unit 1200 is configured to convert the DC power output by the AC incoming line unit 1100 into first DC power. The first output unit 1300 is configured to transmit the first DC power to a power supply conversion subsystem 20.

[0071] Specifically, the AC incoming line unit 1100 converts the input AC power into DC power. The first conversion unit 1200 further converts and adjusts the DC power from the AC incoming line unit 1100 to generate the required first DC power to meet the needs of the subsequent system. The first output unit 1300 transmits the first DC power output by the first conversion unit 1200 to the power supply bus, which is a common connection point for distributing power and is connected to the power supply conversion subsystem 20. The rectifier and booster device in this embodiment can effectively convert AC power into stable DC power, and is suitable for various applications requiring DC power supply, such as electric vehicle charging stations, renewable energy systems, and industrial power systems, thereby improving the efficiency and reliability of the power supply system.

[0072] In one embodiment, the AC incoming line unit 1100 comprises a plurality of rectifier modules and a first DC bus. The first end of the rectifier module is connected to AC power, and the second end of the rectifier module is connected to the first DC bus. The rectifier module is configured to convert AC power into DC power.

[0073] In one embodiment, the AC incoming line unit 1100 further comprises a third circuit breaker and a third contactor. The first end of the third circuit breaker is the first end of the AC incoming line unit 1100, and the second end of the third circuit breaker is connected to the first end of the third contactor. The second end of the third contactor is connected to the rectifier module.

[0074] In one embodiment, as shown in Figure 4 Figure 4 ​This is a schematic diagram of the structure of an AC incoming line unit 1100 provided in one embodiment of this application. The third circuit breaker is a molded case circuit breaker (MCCB), and the third contactor is an AC contactor. Current transformers CSA1~CSA3 and a multi-function meter CSA4 provide relevant measurement capabilities. An AC surge arrester SPDA1 and an AC miniature circuit breaker MCB1 are configured at the input terminal of the molded case circuit breaker. An AC contactor is configured between the molded case circuit breaker and the rectifier module. The AC contactor is used to remotely disconnect the AC power supply, enabling remote control. The molded case circuit breaker acts as a switch for AC power disconnection, providing overload and short-circuit protection. The AC surge arrester protects the system from lightning strikes and voltage surges; the AC miniature circuit breaker provides additional circuit protection. The AC incoming line unit 1100 in this embodiment not only converts AC to DC but also provides comprehensive protection and monitoring functions, ensuring the safety and reliability of the system.

[0075] The AC input unit 1100 is equipped with six rectifier modules (INV1~6). The power of the rectifier modules is determined by the actual situation and is not limited in this application. In this example, the rectifier modules convert 380V AC power to 750V DC power as the input of the first conversion unit 1200. The first DC bus is: DCS+, DCO+, DCSO-. A fuse (not shown in the figure) is configured between the first DC bus DCS+ and DCO+.

[0076] In one embodiment, the first conversion unit 1200 includes at least one conversion subunit, a first terminal of which is connected to a second terminal of the AC input unit 1100; the second terminal of the conversion subunit is connected to a power supply bus; wherein the conversion subunit is used to output a first DC power. Please refer to [link to previous document]. Figure 3 The first transformation unit 1200 includes N transformation sub-units.

[0077] In one embodiment, the conversion subunit includes multiple DC / DC modules, with the first terminal of the DC / DC module connected in parallel to the second terminal of the AC input unit 1100; the second terminal of the DC / DC module is connected to the power supply bus.

[0078] like Figure 5 As shown, Figure 5A structure diagram of a conversion subunit provided by an embodiment of the present application is shown. The conversion subunit includes four DC / DC modules IDC1-IDC4. Each conversion subunit is provided with a contactor and a fuse for breaking the conversion subunit and providing relevant protection functions. The inputs of the four DC / DC modules are connected in parallel, and the outputs are connected in series. The output end of the conversion subunit is connected to a power supply bus, which includes a positive bus DCM+, a negative bus DCM-, and a neutral bus DCN. The DCM+ and the DCM- form a first DC system. In this example, the rectifier module converts 380V AC power into 750V DC power, and the conversion subunit boosts the 750V DC power to 1500V DC power, where the power supply bus DCM+ is +1500V, and the DCM- is -1500V. V DC power, where the power supply bus DCM+ is +1500V, and the DCM- is -1500V.

[0079] In one embodiment, as shown in Figure 5 , the conversion subunit is further provided with a first contactor and a first fuse. The first contactor is arranged at the first end of the conversion subunit and is used to control the conduction and shutdown of the conversion subunit. The first fuse is arranged at the first end of the conversion subunit and is used to protect the conversion subunit.

[0080] In one embodiment, as shown in Figure 6 , the conversion subunit is further provided with a first contactor and a first fuse. The first contactor is arranged at the first end of the conversion subunit and is used to control the conduction and shutdown of the conversion subunit. The first fuse is arranged at the first end of the conversion subunit and is used to protect the conversion subunit. Figure 6 A structure diagram of a first grounding unit 1400 provided by an embodiment of the present application is shown. The power supply bus includes a positive bus, a negative bus, and a neutral bus. The rectifier and booster device further includes a first grounding unit 1400. The first end of the first grounding unit 1400 is connected to the neutral bus, and the second end of the first grounding unit 1400 is grounded. The first grounding unit 1400 includes a second contactor and a first current sensor. The first end of the first current sensor is the first end of the first grounding unit 1400, and the second end of the first current sensor is connected to the first end of the second contactor. The second end of the first current sensor is the second end of the first grounding unit 1400. The first current sensor is used to detect the current of the neutral bus. The second contactor is used to close when there is current flowing through the neutral bus, ensuring that the reference potential of the neutral bus is zero.

[0081] In one embodiment, the first current sensor is a Hall current sensor.

[0082] Specifically, in normal operation, the second contactor is in an open state. When the Hall current sensor CSTE detects that there is current on the neutral bus DCN and detects that there is voltage on the DCN, the second contactor is closed, ensuring that the DCN is at 0 potential, thereby ensuring that the DCM+ is +1500V to ground and the DCM- is -1500V to ground, balancing the positive and negative bus load currents.

[0083] In one of the embodiments, the first grounding unit 1400 is further provided with a fuse and a direct current lightning arrester, wherein the second end of the first current sensor is connected with the direct current lightning arrester through the fuse, and the second end of the direct current lightning arrester is grounded. The fuse and the direct current lightning arrester can prevent large current from passing through and prevent lightning strike events from occurring.

[0084] In one of the embodiments, as shown in Figure 7 Figure 7 A structure diagram of the first output unit 1300 provided by an embodiment of the present application is shown. The first output unit 1300 includes a second current sensor, a third current sensor, a first circuit breaker and a second circuit breaker; the second current sensor is connected with the positive bus through the first circuit breaker; the third current sensor is connected with the negative bus through the second circuit breaker; the second current sensor is used for detecting the current of the positive bus; the first circuit breaker is used for controlling the conduction and shutdown of the positive bus; the third current sensor is used for detecting the current of the negative bus; and the second circuit breaker is used for controlling the conduction and shutdown of the negative bus.

[0085] Specifically, the first circuit breaker and the second circuit breaker are direct current molded case circuit breakers, and the positive and negative buses are both provided with direct current molded case circuit breakers with live operation. The direct current molded case circuit breakers can control the opening and closing of the circuit breaker through remote control of the rectifier and booster device, and are used for remotely disconnecting the direct current looped network circuit and providing protection capability. In addition, a fuse FU4 is also needed. At the same time, each of the positive and negative buses is provided with a direct current lightning arrester (SPD1 and SPD2) to prevent the damage of equipment caused by direct current lightning and induced lightning.

[0086] In one of the embodiments, as shown in Figure 8 Figure 8 A structure diagram of the first power supply unit 1500 provided by an embodiment of the present application is shown. The rectifier and booster device further includes: a first power supply unit 1500; the first end of the first power supply unit 1500 is connected with the alternating current incoming line unit 1100, and the second end of the first power supply unit 1500 is connected with the control unit; the first power supply unit 1500 is used for supplying power to the control unit; and the control unit is used for controlling the rectifier and booster device and the power supply conversion subsystem 20.

[0087] Specifically, the first power supply unit 1500 supplies a set of 220V alternating current power sources through a set of alternating current miniature circuit breakers MCB2 to supply power to the heat dissipation fans (FAN1~FAN16) in the rectifier and booster device, and converts the power through switch power supplies PAS and PAB to supply power to the control unit.

[0088] In one of the embodiments, please refer to Figure 2 ​​The first end of the first power supply conversion subsystem 20 is connected with a rectifier and booster device, and the second end of the first power supply conversion subsystem 20 is connected with the first end of the next power supply conversion subsystem 20. The second end of the last power supply conversion subsystem 20 is connected with another rectifier and booster device.

[0089] In one embodiment, as shown in Figure 9 Figure 9 Fig. 1 shows a structural schematic diagram of a power supply conversion subsystem 20 provided by an embodiment of the present application. The power supply conversion subsystem 20 comprises an incoming and outgoing line unit 210, a second conversion unit 220 and a second output unit 230. The first end of the incoming and outgoing line unit 210 is the first end of the power supply conversion subsystem 20, the second end of the incoming and outgoing line unit 210 is the second end of the power supply conversion subsystem 20, and the third end of the incoming and outgoing line unit 210 is connected with the first end of the second conversion unit 220. The second end of the second conversion unit 220 is connected with the first end of the second output unit 230. The incoming and outgoing line unit 210 is configured to supply power to the power supply conversion subsystem 20. The second conversion unit 220 is configured to convert first direct current into second direct current. The second output unit 230 is configured to supply power to loads in a station site.

[0090] Specifically, the power supply conversion subsystem 20 is mainly distributed in each main line station, and the station load is small, only basic power consumption such as ticket gates, elevators, large screens, ticketing systems, station air conditioners and lighting lamps, etc. The second output unit 230 is configured to supply power to loads in the station. The incoming and outgoing line unit 210 is connected with a direct current loop network incoming cable and an outgoing cable. The incoming and outgoing line unit 210 is also connected with the second conversion unit 220. The second conversion unit 220 is configured to convert first direct current into second direct current. The second output unit 230 is configured to supply power to loads in a station site based on the second direct current. In this example, the second conversion unit 220 converts ±1500V direct current voltage on the loop network side into 700V direct current voltage. The second output unit 230 converts the 700V direct current voltage into alternating current or direct current required by the loads. The incoming and outgoing line unit 210 provides a direct current loop network incoming cable interface DCL+, DCL-, an outgoing cable interface DCR+, DCR-. The incoming cable interface is connected with a rectifier and booster device, or the previous power supply conversion subsystem 20. The outgoing cable interface is connected with the next power supply conversion subsystem 20, or the rectifier and booster device. The incoming cable and the outgoing cable are each connected with a set of direct current lightning arresters, and a corresponding backup protection fuse is configured. A direct current live operating molded case circuit breaker (with alarm contacts and auxiliary contacts) is configured at the direct current loop network incoming and outgoing line port.

[0091] In one embodiment, please refer to Figure 9 ​The input and output line unit 210 further comprises a second DC bus, a third DC bus, a pre-charging module, and a fourth contactor and a fifth contactor arranged between the second DC bus and the third DC bus; a first end of the second DC bus is the first end of the input and output line unit 210, a second end of the second DC bus is connected with the third DC bus through the fourth contactor and the fifth contactor; a first end of the pre-charging module is connected with the second end of the second DC bus, and a second end of the pre-charging module is connected with a first end of the third DC bus.

[0092] Specifically, the second DC bus is DC+ and DC-, and the third DC bus is DCT+, DCT- and DCN. The fourth contactor and the fifth contactor use a relay self-locking circuit to ensure current transmission. At the same time, the pre-charging module can first perform small current pre-charging when supplying power to the load or the inverter module, so as to prevent sudden large current from damaging the internal key components.

[0093] In one of the embodiments, please refer to Figure 9 The third DC bus comprises a positive bus, a negative bus and a neutral bus; the input and output line unit 210 further comprises a second grounding unit 240; a first end of the second grounding unit 240 is connected with the neutral bus, and a second end of the second grounding unit 240 is grounded; the second grounding unit 240 ensures that the reference potential of the neutral bus is zero.

[0094] In one of the embodiments, the second conversion unit 220 comprises at least 4 DC / DC modules, wherein a first end of the DC / DC module is connected in series with the third end of the input and output line unit 210, and a second end of the DC / DC module is connected in parallel to the second output unit 230. Please refer to Figure 9 , Figure 9 for one of the examples of the second conversion unit 220.

[0095] Specifically, in this example, the second conversion unit 220 is configured with 4 20kW isolated DC / DC modules, wherein the input ends of the DC / DC modules are connected in series, and the output ends are connected in parallel, as shown in Figure 9 The output end of the second conversion unit 220 is connected to the internal DC bus DCP+ and DCP-, wherein a fuse is arranged at DCP+, and the fuse uses a 1kV / 200A fuse. Each DC / DC module does not have an independent contactor, and needs to be reset as a whole when reset is needed.

[0096] In one of the embodiments, the second output unit 230 comprises a step-down unit for reducing the voltage of the second DC to supply the DC load.

[0097] In one of the embodiments, as shown in Figure 10 , Figure 10This is a schematic diagram of the structure of a second output unit 230 provided in an embodiment of this application. The second output unit 230 includes: an inverter module, a first terminal of which is connected to a second terminal of a second conversion unit 220, and a second terminal of which is connected to an AC load; the inverter module is used to convert a second direct current into a first alternating current to supply power to the AC load.

[0098] Specifically, the second output unit 230 converts the second DC power into the first AC power to supply power to the AC load. In this example, the inverter module is a DC / AC bidirectional module. The DC / AC bidirectional module uses an independent DC contactor and supports live replacement. An AC contactor (ACC) is installed on the AC side of the DC / AC bidirectional module, and current sensors are installed on each phase line outside the AC contactor. The battery pack liquid cooling device is powered by phase A on the AC side and is equipped with an AC contactor.

[0099] In one embodiment, such as Figure 11 As shown, Figure 11 This is a schematic diagram of the structure of the second power supply unit 250 provided in an embodiment of this application. The power conversion subsystem 20 also includes the second power supply unit 250, the first end of which is connected to the second end of the second conversion unit 220, and the second end of which is connected to the system load; the second power supply unit 250 is used to convert the second DC power into the target DC power to supply power to the system load.

[0100] Specifically, the second power supply unit 250 includes three switching power supplies (PSAD, PSBD, and PSCD) with a 24V output. PSAD supplies power the control circuit, PSBD supplies power the sampling circuit, and PSCD supplies power the internal cooling fan. An additional external circuit interface should be configured in the output circuit of PSAD. Upon initial power-up of the power conversion subsystem 20, the external power supply powers the entire system control circuit, enabling the power conversion subsystem 20 to operate normally.

[0101] In one embodiment, such as Figure 12 As shown, Figure 12 This is a schematic diagram of the structure of a charging unit 260 provided in an embodiment of this application. The power conversion subsystem 20 also includes a charging unit 260, the first end of which is connected to the second end of the second conversion unit 220, and the second end of which is connected to an energy storage device; the charging unit 260 is used to charge the energy storage device.

[0102] Specifically, the energy storage device is a battery pack. The charging unit 260 draws power from the DC bus and charges the battery pack via DC contactors DCBC+, DCBB+, and DCBB-, such as... Figure 12As shown, the anti-reverse diode is connected in parallel across the DC contactor DCBC+ connected with the DCP+ DC bus. In normal operation, the DC contactor DCBC+ is in an open state. When the ring network is powered off, the battery pack provides power through the DC contactor DCBB+, the anti-reverse diode, and the DC contactor DCBB- for discharging. Since the anti-reverse diode generates a large amount of heat during long-time operation, after the discharging is stable, the DC contactor DCBC+ is closed to enable the battery pack to discharge through the DC contactor DCBC+. When the DC ring network is powered on, the DC bus voltage is greater than the battery pack voltage, and the battery pack is charged. After the battery pack is fully charged, the DC contactor DCBC+ is opened.

[0103] In one embodiment, as shown in FIG. 1, Figure 13 Figure 13 FIG. 3 shows a structure diagram of a third power supply unit 270 according to an embodiment of the present application. The power supply conversion subsystem 20 further includes the third power supply unit 270. The first end of the third power supply unit 270 is connected with the energy storage device, and the second end of the third power supply unit 270 is connected with the control power supply. The third power supply unit 270 supplies power to the control power supply, and the control power supply is used to supply power to the system load in the station site.

[0104] Specifically, in the present example, the energy storage device is a battery pack (BATH, BATL). Two battery packs are used in series. The output ends of the battery packs are BAT+ and BAT-. The output ends of the battery packs supply a group (two) of 480W / 24V DC power supplies (PSAP, PSAN) through a group of DC miniature circuit breakers as the control power supply of the inverter station equipment. The control system can work normally when one of the power supplies is in normal operation. An intermediate relay (JS1- JS2) is configured at the output end of each switching power supply. When the control system detects that the voltages of the two battery packs are not balanced, the use of the two battery packs is adjusted by controlling the intermediate relays JS1 and JS2, so that the voltages of the two battery packs are balanced. The voltage output value of the power supply connected with BAT+ and BAT- is slightly lower than 24V, which ensures that the control system is preferentially powered by the DC ring network. In other embodiments, 1kV / 6A DC miniature circuit breakers are used for BAT+ and BAT-. The DC miniature circuit breakers corresponding to BAT+ and BAT- are configured with a split-dropping release for cutting off the control power supply circuit when the battery voltage is low.

[0105] The division of units is merely a logical functional division, and in actual implementation, another division manner can be used, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0106] ​The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0107] In addition, each functional unit in various embodiments of the application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0108] If the function is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the various embodiment methods of the application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0109] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. The program executes to perform the steps of the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various media that can store program codes.

[0110] Finally, it should be noted that those skilled in the art, after considering the specification and practicing the application disclosed herein, will easily think of other embodiments of the application. The application is intended to cover any variations, uses, or adaptations of the application that follow the general principles of the application and include common knowledge or conventional technical means in the art that are not disclosed by the application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is only limited by the appended claims.

Claims

1. A power supply system characterized by comprising: The application relates to a power supply system. The power supply system comprises a direct-current boosting subsystem, a power supply bus and N power supply conversion subsystems, wherein N>2. The direct-current boosting subsystem comprises at least two rectifier boosting devices which are arranged in a target area and are connected through two power supply buses to form a direct-current loop circuit with a voltage of +1500V, and are used for converting 380V AC power into first direct-current power through single-stage rectification and boosting without a high-voltage AC bus. Each power supply conversion subsystem is arranged in a corresponding area, is connected in series to the direct-current loop circuit and the power supply bus, and is used for converting the first direct-current power and supplying the converted power to loads in the area.

2. The system of claim 1, wherein, The rectifier boosting device comprises an AC incoming line unit, a first conversion unit and a first output unit. The AC incoming line unit is used for converting AC power into direct-current power.

3. The system of claim 2, wherein, The first conversion unit is used for converting the direct-current power output by the AC incoming line unit into the first direct-current power. The first output unit is used for transmitting the first direct-current power to the power supply conversion subsystem.

4. The system of claim 3, wherein, The first conversion unit comprises at least one conversion subunit.

5. The system of claim 3, wherein, The conversion subunit is used for outputting the first direct-current power. The conversion subunit comprises a plurality of DC / DC modules. The DC / DC modules are connected in parallel to the second end of the AC incoming line unit.

6. The system of claim 2, the power supply bus comprising a positive bus, a negative bus, and a neutral bus; wherein, The conversion subunit is further provided with a first contactor and a first fuse. The first contactor is arranged at the first end of the conversion subunit and is used for controlling the conduction and shutdown of the conversion subunit. The first fuse is arranged at the first end of the conversion subunit and is used for protecting the conversion subunit. The rectifier boosting device further comprises a first grounding unit. The first grounding unit comprises a second contactor and a first current sensor. The first current sensor is used for detecting the current of the neutral bus. The second contactor is used for being closed when current flows through the neutral bus, and ensuring that the reference potential of the neutral bus is zero.

7. The system of claim 6, wherein, The first output unit comprises a second current sensor, a third current sensor, a first circuit breaker and a second circuit breaker; the second current sensor is connected with the positive bus through the first circuit breaker; the third current sensor is connected with the negative bus through the second circuit breaker; The second current sensor is used for detecting the current of the positive bus; the first circuit breaker is used for controlling the conduction and the turn-off of the positive bus; the third current sensor is used for detecting the current of the negative bus; and the second circuit breaker is used for controlling the conduction and the turn-off of the negative bus.

8. The system of claim 2, wherein, The AC incoming line unit comprises a plurality of rectifier modules and a first DC bus; the first end of the rectifier module is connected with the AC power, and the second end of the rectifier module is connected with the first DC bus; The rectifier module is used for converting the AC power into DC power.

9. The system of claim 8, wherein, The AC incoming line unit further comprises a third circuit breaker and a third contactor; The first end of the third circuit breaker is the first end of the AC incoming line unit, the second end of the third circuit breaker is connected with the first end of the third contactor; and the second end of the third contactor is connected with the rectifier module.

10. The system of claim 8, wherein, The rectifier and voltage boosting device further comprises a first power supply unit; the first end of the first power supply unit is connected with the AC incoming line unit, and the second end of the first power supply unit is connected with a control unit; the first power supply unit is used for supplying power to the control unit; The control unit is used for controlling the rectifier and voltage boosting device and the power supply conversion subsystem.

11. The system according to claim 1, wherein, The first end of the first power supply conversion subsystem is connected with one of the rectifier and voltage boosting devices, and the second end of the first power supply conversion subsystem is connected with the first end of the next power supply conversion subsystem; The second end of the last power supply conversion subsystem is connected with another rectifier and voltage boosting device.

12. The system of claim 11, wherein, The power supply conversion subsystem comprises an incoming and outgoing line unit, a second conversion unit and a second output unit; the first end of the incoming and outgoing line unit is the first end of the power supply conversion subsystem, the second end of the incoming and outgoing line unit is the second end of the power supply conversion subsystem, and the third end of the incoming and outgoing line unit is connected with the first end of the second conversion unit; the second end of the second conversion unit is connected with the first end of the second output unit; The incoming and outgoing line unit is used for supplying power to the power supply conversion subsystem; the second conversion unit is used for converting the first DC power into second DC power; and the second output unit is used for supplying power to the load in the station site.

13. The system of claim 12, wherein, The incoming and outgoing line unit further comprises a second DC bus, a third DC bus, a pre-charging module, and a fourth contactor and a fifth contactor arranged between the second DC bus and the third DC bus; The first end of the second DC bus is the first end of the incoming and outgoing line unit, and the second end of the second DC bus is connected with the third DC bus through the fourth contactor and the fifth contactor; The first end of the pre-charging module is connected with the second end of the second DC bus, and the second end of the pre-charging module is connected with the first end of the third DC bus.

14. The system of claim 13, wherein, The third DC bus includes a positive bus, a negative bus, and a neutral bus; The incoming and outgoing line unit further includes: a second grounding unit; the first end of the second grounding unit is connected to the neutral bus, and the second end of the second grounding unit is grounded; the second grounding unit ensures that the reference potential of the neutral bus is zero.

15. The system of claim 12, wherein, The second conversion unit includes at least four DC / DC modules, wherein the first terminal of each DC / DC module is connected in series with the third terminal of the input / output unit, and the second terminal of each DC / DC module is connected in parallel to the second output unit.

16. The system of claim 12, wherein, The second output unit includes: an inverter module, the first end of which is connected to the second end of the second conversion unit, and the second end of which is connected to an AC load; The inverter module is used to convert the second DC power into the first AC power to supply power to the AC load.

17. The system of claim 12, wherein, The power conversion subsystem further includes a second power supply unit, the first end of which is connected to the second end of the second conversion unit, and the second end of which is connected to the system load. The second power supply unit is used to convert the second DC power into the target DC power to supply power to the system load.

18. The system of claim 12, wherein, The power conversion subsystem further includes a charging unit, the first end of which is connected to the second end of the second conversion unit, and the second end of which is connected to an energy storage device. The charging unit is used to charge the energy storage device.

19. The system of claim 18, wherein, The power conversion subsystem further includes a third power supply unit. The first end of the third power supply unit is connected to the energy storage device, and the second end of the third power supply unit is connected to the control power supply. The third power supply unit supplies power to the control power supply, which is used to supply power to the system load within the station.

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