PCTC reversible charging and discharging system

Abstract

The PCTC reversible charging and discharging system comprises a power battery of a vehicle, a plurality of charging and discharging ground plugs, a ship power distribution module, a charging mode and a discharging mode. The ship power distribution module comprises a ship power distribution board and a vehicle power distribution board, a power battery of a vehicle is electrically connected with the vehicle power distribution board through a charging and discharging ground plug, and the vehicle power distribution board is further electrically connected with the ship power distribution board. The ship power distribution module further comprises a control unit, and the control unit is used for obtaining the charge state of the power battery through the charge and discharge ground plugs and determining to start a charge mode or a discharge mode according to the charge state. When the charging mode is started, the power battery charges the ship distribution board through the charging and discharging ground plug and the vehicle distribution board; and when the discharging mode is started, the ship distribution board discharges the power battery of the vehicle through the vehicle distribution board and the charging and discharging ground plug. By means of the system, the power battery of the vehicle serves as ship charging power, charging and discharging between the vehicle and the ship are achieved, cost is reduced, and energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of PCTC, and in particular to a PCTC reversible charge and discharge system. Background Art

[0002] The trend of large-scale car carriers (PCTC) is becoming increasingly obvious. The actual ships currently designed and built have exceeded the level of 10,000 cars. The amount of cargo carried by a single ship per trip is huge, and the demand for ship energy consumption such as power load has increased sharply. At the same time, under the environmental protection background such as carbon neutrality, the control requirements for design factors such as ship energy consumption and emissions have become increasingly stringent. In recent years, the development trend of new energy vehicles has far exceeded that of traditional fuel vehicles, and their proportion in the cargo transported by PCTC has become increasingly higher, gradually becoming the mainstream PCTC cargo category that can be foreseen in the future. For PCTC ships, the power of the ship plays a vital role in the normal transportation of PCTC.

[0003] The existing way to charge and discharge ships usually uses fuel products (mostly heavy oil) to generate electricity to meet the ship's electricity needs. In recent years, as fuel prices have hit new highs, the cost of ship power generation has continued to rise, and fuel produces a large amount of sulfide and nitrogen oxide during combustion, causing serious pollution to the surrounding environment. In addition, for large PCTC ships, the electricity demand required for their electricity consumption is high, resulting in a large load on the power system. Summary of the invention

[0004] The present invention provides a PCTC reversible charging and discharging system, which utilizes the power battery of a vehicle as power to charge a ship switchboard, and when the state of charge of the power battery of the vehicle is lower than a preset state of charge, the discharge of the ship switchboard is utilized to charge the power battery of the vehicle, thereby realizing charging and discharging between the vehicle and the ship, reducing the power load of the system, reducing costs, and saving energy and reducing emissions.

[0005] The present invention provides a PCTC reversible charging and discharging system, including a vehicle power battery, a plurality of charging and discharging ground plugs, a ship power distribution module, a charging mode and a discharging mode;

[0006] The ship power distribution module includes a ship power distribution board and a vehicle power distribution board. The vehicle's power battery is electrically connected to the vehicle power distribution board through a charging and discharging plug, and the vehicle power distribution board is also electrically connected to the ship power distribution board.

[0007] The ship power distribution module also includes a control unit, which is electrically connected to each charging and discharging ground plug, charging mode and discharging mode respectively. The control unit is used to obtain the charge state of the power battery through each charging and discharging ground plug, and determine whether to start the charging mode or the discharging mode according to the charge state; when the charging mode is turned on, the power battery of the vehicle charges the ship distribution board through the charging and discharging ground plug and the vehicle distribution board; when the discharging mode is turned on, the ship distribution board discharges the power battery of the vehicle through the vehicle distribution board and the charging and discharging ground plug.

[0008] Optionally, the ship power distribution module further includes a detection unit, which is electrically connected to each charging and discharging ground plug and the control unit respectively;

[0009] When the charging mode is turned on, the detection unit is used to collect the discharge status information of the power battery of the corresponding vehicle through each charging and discharging plug, and send the collected discharge status information of multiple power batteries to the control unit;

[0010] The control unit is also used to obtain multiple discharge status information, and when each discharge status information is the same, perform a grid-connected operation so that the vehicle's power battery charges the ship's distribution board through the charging and discharging ground plug and the vehicle distribution board.

[0011] Optionally, the system further comprises a plurality of switches; the discharge state information comprises at least phase information;

[0012] The number of switches is the same as the number of charging and discharging ground plugs, and the switches are located between the vehicle power distribution board and the charging and discharging ground plugs; each switch is electrically connected to the control unit;

[0013] When the charging mode is turned on, the control unit is also used to control one of the switches to close, and obtain the phase information of the power battery of the vehicle corresponding to the closed switch, taking the phase information of the power battery of the vehicle corresponding to the closed switch as the reference phase, obtaining multiple phase information of the power batteries of the vehicles corresponding to the remaining unclosed switches at preset intervals, and when each phase information is the same as the reference phase, controlling the remaining unclosed switches to close to perform the grid-connected operation.

[0014] Optionally, when the discharge mode is turned on, the control unit is also used to obtain the charge state of the vehicle's power battery through the charging and discharging ground plug to determine the number of vehicles whose charge state is lower than a preset charge, and determine the power of the ship distribution board required to charge the vehicle's power battery according to the number of vehicles, query the total power of the ship distribution board, and control the ship distribution board to discharge the vehicle's power battery through the vehicle distribution board and the charging and discharging ground plug according to the queried total power of the ship distribution board and the required power of the ship distribution board until the charge state of the vehicle's power battery reaches the preset charge.

[0015] Optionally, the system further comprises a ship generator;

[0016] The ship generator is electrically connected to the control unit and the ship switchboard respectively. The control unit is also used to control the ship generator to start when the total power of the queried ship switchboard does not meet the required power of the ship switchboard, so that the ship generator charges the ship switchboard;

[0017] The control unit is also used to query the remaining power of the ship's switchboard when the charge state of the vehicle's power battery reaches a preset charge, and control the ship's generator to remain on or off according to the remaining power.

[0018] Optionally, the system further comprises a reactive power module;

[0019] The reactive power module is electrically connected between the vehicle distribution board and the electrical load of the ship. The reactive power module includes a voltage detection unit, which is electrically connected to the control unit. The voltage detection unit is used to detect the bus voltage of the vehicle distribution board and send the bus voltage to the control unit. The control unit is also used to provide reactive power compensation to the electrical load when the bus voltage is lower than a preset range of the rated voltage until the bus voltage reaches the rated voltage.

[0020] Optionally, the reactive power module includes an uninterruptible power supply unit and a reactive power regulation unit;

[0021] The uninterruptible power supply unit is connected in parallel with the reactive power regulation unit and is located between the vehicle distribution board and the power load;

[0022] The uninterruptible power supply unit is used to supply power to the electrical load when the reactive power regulation unit is not working;

[0023] The reactive power regulation unit is used to provide reactive power compensation to the power load when the bus voltage is lower than a preset range of the rated voltage, so that the bus voltage reaches the rated voltage.

[0024] Optionally, the reactive power module further includes a switch control unit, and the uninterruptible power supply unit includes an uninterruptible power supply, a first switch, and a second switch;

[0025] The uninterruptible power supply is electrically connected between a first switch and a second switch, the first switch is electrically connected to the vehicle power distribution board, and the second switch is electrically connected to the power load;

[0026] The switch control unit is electrically connected to the first switch and the second switch respectively, and is used to control the first switch and the second switch to be closed when the reactive power adjustment unit is not working; and to control the first switch and the second switch to be opened when providing reactive power compensation to the electrical load;

[0027] The switch control unit is also used to control the second switch and the first switch to close in sequence when the bus voltage reaches the rated voltage.

[0028] Optionally, the reactive power module further includes a switch control unit, and the reactive power adjustment unit includes a compensation inductor, a third switch and a fourth switch;

[0029] The compensating inductor is electrically connected between the third switch and the fourth switch, the third switch is electrically connected to the vehicle power distribution board, and the fourth switch is electrically connected to the power load;

[0030] The switch control unit is electrically connected to the third switch and the fourth switch respectively, and is used to control the third switch and the fourth switch to close when the bus voltage is lower than a preset range of the rated voltage; and to control the third switch to open when the bus voltage reaches the rated voltage.

[0031] Optionally, the uninterruptible power supply unit includes a first switch, and the first switch and the third switch are interlocked.

[0032] The technical solution of the present invention obtains the state of charge of the power battery through the control unit, and determines to start the charging mode or the discharging mode according to the state of charge. When the charging mode is turned on, the power battery of the vehicle charges the ship's distribution board through the charging and discharging ground plug and the vehicle distribution board; when the discharging mode is turned on, the ship's distribution board discharges the power battery of the vehicle through the vehicle distribution board and the charging and discharging ground plug. Utilizing the above structure, the power battery of the vehicle is used as the power of the ship's distribution board, and according to the relationship between the acquired state of charge of the power battery and the preset charge amount, reversible charging and discharging between the vehicle and the ship is realized, reducing the power load of the system, reducing costs, and saving energy and reducing emissions.

[0033] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the structure of a PCTC reversible charge and discharge system provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of a control unit connection relationship provided by an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the structure of a second PCTC reversible charge and discharge system provided in an embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of a third PCTC reversible charge and discharge system provided in an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the structure of a second control unit connection relationship provided by an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of the structure when the phases of the power batteries provided in the embodiment of the present invention are different;

[0041] Figure 7 A schematic diagram of the structure when the phases of the power batteries provided by the embodiment of the present invention are the same;

[0042] Figure 8 A schematic structural diagram of a fourth PCTC reversible charge and discharge system provided in an embodiment of the present invention;

[0043] Fig. 9 A schematic structural diagram of a fifth PCTC reversible charge and discharge system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] In one embodiment, Figure 1 A schematic diagram of the structure of a PCTC reversible charge and discharge system provided in an embodiment of the present invention, Figure 2FIG. 1 is a schematic diagram of a control unit connection relationship provided in an embodiment of the present invention. This embodiment is applicable to the case where vehicles and ships in a PCTC realize reversible charging and discharging. Figure 1 and Figure 2 As shown, the system includes a power battery 1 of a vehicle, multiple charging and discharging ground plugs 2, a ship power distribution module 3, a charging mode 4 and a discharging mode 5; the ship power distribution module 3 includes a ship distribution board 31 and a vehicle distribution board 32, the power battery 1 of the vehicle is electrically connected to the vehicle distribution board 32 through the charging and discharging ground plug 2, and the vehicle distribution board 32 is also electrically connected to the ship distribution board 31; the ship power distribution module 3 also includes a control unit 33, the control unit 33 is electrically connected to each charging and discharging ground plug 2, the charging mode 4 and the discharging mode 5 respectively, the control unit 33 is used to obtain the charge state of the power battery 1 through each charging and discharging ground plug 2, and determine to start the charging mode 4 or the discharging mode 5 according to the charge state; when the charging mode 4 is turned on, the power battery 1 of the vehicle charges the ship distribution board 31 through the charging and discharging ground plug 2 and the vehicle distribution board 32; when the discharging mode 5 is turned on, the ship distribution board 31 discharges the power battery 1 of the vehicle through the vehicle distribution board 32 and the charging and discharging ground plug 2.

[0047] Among them, the power battery 1 of the vehicle is the core component of the new energy vehicle, and charging and discharging are mainly achieved by the migration of lithium ions between the positive and negative electrodes. During the charging process, lithium ions are transferred from the positive electrode to the negative electrode, and during the discharging process, lithium ions migrate from the negative electrode to the positive electrode, releasing the stored electrical energy. The charging and discharging ground plug 2 is a socket installed on the ground, which is usually used to connect to fixed wiring as a terminal and outlet of the ground wiring system. In this embodiment, the charging and discharging ground plug 2 is electrically connected to the power battery 1 of the vehicle and the vehicle distribution board 32, so that the electrical energy of the vehicle distribution board 32 can be transmitted to the power battery 1 through the charging and discharging ground plug 2, and the reversible process is the same. The ship distribution board 31 is the core component of the system, responsible for distributing and controlling the power supply of the ship. The vehicle distribution board 32 is a distribution board used for power distribution and control of mobile equipment such as vehicles on ships. Charging mode 4 is used for the power battery 1 of the vehicle to charge the ship distribution board 31 to increase the power of the ship distribution board 31. The discharge mode 5 is used for the ship switchboard 31 to discharge the power battery 1 of the vehicle so as to increase the power of the power battery 1 of the vehicle.

[0048] Specifically, when determining the working mode of the charging and discharging system, the control unit 33 is electrically connected to each charging and discharging ground plug 2, charging mode 4 and discharging mode 5 respectively, and the power battery 1 of the vehicle is electrically connected to the vehicle distribution board 32 through the charging and discharging ground plug 2, and the vehicle distribution board 32 is electrically connected to the ship distribution board 31. Usually, when transporting new energy vehicles on a ship, multiple parking spaces are set on the deck of the ship, each parking space is provided with a charging and discharging ground plug 2, and each parking space can be placed with a new energy vehicle. When the vehicle arrives at the designated parking space, each charging and discharging ground plug 2 can be electrically connected to the power battery 1 of each vehicle in the corresponding parking space by manual means. After the setting is completed, the control unit 33 can obtain the charge state of the power battery 1 of the corresponding vehicle through each charging and discharging ground plug 2, and determine to start the charging mode 4 or the discharging mode 5 of the ship according to the charge state of the power battery 1 of the vehicle. In this embodiment, when the control unit 33 determines that the state of charge of the power battery 1 is lower than the preset charge, and the number of vehicles with a charge lower than the preset charge meets the first preset number of vehicles, it indicates that the charge of the power battery 1 of the vehicle is low at this time, and the power battery 1 needs to be charged. Then the control unit 33 will control the start of the discharge mode 5, so that the ship switchboard 31 discharges the power battery 1 of the vehicle through the vehicle switchboard 32 and the charging and discharging ground plug 2, so as to avoid the vehicle from running out of power and affecting the vehicle life. When the control unit 33 determines that the state of charge of the power battery 1 is higher than the preset charge, and the number of vehicles with a charge higher than the preset charge meets the second preset number of vehicles, it indicates that the charge of the power battery 1 of the vehicle is high at this time, and the power battery 1 does not need to be charged. Then the control unit 33 will control the start of the charging mode 4, so that the power battery 1 of the vehicle is output to the ship switchboard 31 through the charging and discharging ground plug 2 and the vehicle switchboard 32 in the form of alternating current, so as to realize the charging of the ship switchboard 31 and ensure the normal operation of the ship. Among them, the first preset number of vehicles, the second preset number of vehicles and the preset charge can be specifically determined according to actual conditions, and are not limited here. Exemplarily, the first preset number of vehicles may be 1 / 4, 1 / 3 or 1 / 2 of the total number of vehicles, the second preset number of vehicles may be 1 / 4, 1 / 3 or 1 / 2 of the total number of vehicles, and the preset charge may generally be set to less than 30%, such as 20%, 25% or 30%.

[0049] The technical solution of the embodiment of the present invention obtains the state of charge of the power battery through the control unit, and determines to start the charging mode or the discharging mode according to the state of charge. When the charging mode is turned on, the power battery of the vehicle charges the ship's distribution board through the charging and discharging ground plug and the vehicle distribution board; when the discharging mode is turned on, the ship's distribution board discharges the power battery of the vehicle through the vehicle distribution board and the charging and discharging ground plug. Using the above structure, the power battery of the vehicle is used as the power of the ship's distribution board, and according to the relationship between the acquired state of charge of the power battery and the preset charge amount, reversible charging and discharging between the vehicle and the ship is realized, reducing the power load of the system, reducing costs, and saving energy and reducing emissions.

[0050] Optional, Figure 3 A schematic diagram of the structure of a second PCTC reversible charge and discharge system provided in an embodiment of the present invention, referring to Figure 1 and Figure 3 As shown, the ship power distribution module 3 also includes a detection unit 34, which is electrically connected to each charging and discharging ground plug 2 and the control unit 33 respectively; when the charging mode 4 is turned on, the detection unit 34 is used to collect the discharge status information of the power battery 1 of the corresponding vehicle through each charging and discharging ground plug 2, and send the collected discharge status information of multiple power batteries 1 to the control unit 33; the control unit 33 is also used to obtain multiple discharge status information, and when each discharge status information is the same, perform a grid-connected operation, so that the power battery 1 of the vehicle charges the ship distribution board 31 through the charging and discharging ground plug 2 and the vehicle distribution board 32.

[0051] The detection unit 34 is used to detect the discharge status information of the power battery 1 of the vehicle.

[0052] Specifically, when the control unit 33 determines to turn on the charging mode 4, the power battery 1 will charge the ship distribution board 31 through the charging and discharging ground plugs 2 and the vehicle distribution board 32. At this time, it is necessary to ensure that the power batteries 1 are in the same discharge state before the ship distribution board 31 can be charged normally. To this end, the detection unit 34 will collect the discharge state information of the power battery 1 of the vehicle in the corresponding parking space through each charging and discharging ground plug 2. Among them, the discharge state information may include the voltage, frequency and phase of the power battery 1. Normally, the voltage and frequency of the power battery 1 can be uniformly set. For example, the voltage of the power battery 1 is 220V and the frequency is 60Hz. After the detection unit 34 detects the discharge status information of the power battery 1, it will be sent to the control unit 33. After the control unit 33 obtains the discharge status information of the power battery 1, if the discharge status information of each power battery 1 is different, the control unit 33 can maintain the operation of continuous acquisition. Only when the obtained discharge status information of the power batteries 1 are the same, the control unit 33 will perform the grid-connected operation to close the path between the ship distribution board 31 and the power battery 1 of the vehicle. The power battery 1 of the vehicle can charge the ship distribution board 31 through the charging and discharging ground socket 2 and the vehicle distribution board 32, that is, the charging of the ship distribution board 31 is realized.

[0053] Optional, Figure 4 A schematic diagram of the structure of a third PCTC reversible charge and discharge system provided in an embodiment of the present invention, Figure 5 A schematic diagram of a second control unit connection relationship provided in an embodiment of the present invention, Figure 6 A schematic diagram of a structure when the phases of the power batteries provided in an embodiment of the present invention are different. Figure 7 This is a schematic diagram of the structure of the power batteries provided in the embodiment of the present invention when the phases are the same, refer to Figures 4 to 7 As shown, the system also includes multiple switches 6; the discharge status information includes at least phase information; the number of switches 6 is the same as the number of charging and discharging ground plugs 2, and the switches 6 are located between the vehicle distribution board 32 and the charging and discharging ground plug 2; each switch 6 is electrically connected to the control unit 33; when the charging mode 4 is turned on, the control unit 33 is also used to control one of the switches 6 to close, and obtain the phase information of the power battery 1 of the vehicle corresponding to the closed switch 6, and use the phase information of the power battery 1 of the vehicle corresponding to the closed switch 6 as the reference phase, and obtain multiple phase information of the power battery 1 of the vehicle corresponding to the remaining unclosed switches 6 at preset intervals, and when each phase information is the same as the reference phase, control the remaining unclosed switches 6 to close to perform grid-connected operation.

[0054] Specifically, when charging mode 4 is turned on, the detection unit 34 will detect the discharge status information of the power battery 1, that is, the phase information, through the charging and discharging ground plug 2, and send the phase information to the control unit 33, and the control unit 33 will perform the grid-connected operation. When the control unit 33 performs the grid-connected operation, it will first control one of the switches 6 between the vehicle distribution board 32 and the charging and discharging ground plug 2 to be closed, and obtain the phase information of the power battery 1 corresponding to the closed switch 6, and use the obtained phase information of the power battery 1 as the reference phase, which can also be expressed as the anchor point phase, and obtain the phase information of the power battery 1 corresponding to the remaining switches 6 at a preset interval time, wherein the setting of the preset interval time is related to the frequency of the power battery 1. When the frequency of the power battery 1 is 60Hz, the corresponding preset interval time can be any interval time within the range of [8.3,16.7], in seconds, which can be determined according to the actual situation and is not limited here. When the phase information of the power battery 1 corresponding to the remaining unclosed switches 6 obtained by the control unit 33 is different from the reference phase, the reference phase Figure 6 , the horizontal axis is time t, the vertical axis is voltage amplitude U, and m is the number of charging and discharging ground plugs 2. It can be seen that there is a certain time deviation between the phase curves of the m charging and discharging ground plugs 2. At this time, the phase information of the power battery 1 can be obtained at a preset interval. When it is determined that the phase information of multiple power batteries 1 is the same as the reference phase, the reference Figure 7 It can be seen that the phase curves of the m charging and discharging ground plugs 2 overlap, indicating that the power battery 1 of the vehicle has reached the condition for charging the ship distribution board 31 at this time, and the control unit 33 will perform the grid-connected operation and control the remaining unclosed switches 6 to close, so that the electric energy of the power battery 1 can be transmitted to the ship distribution module 3 through the charging and discharging ground plug 2, thereby realizing the normal charging of the ship distribution board 31.

[0055] It is understandable that, since there are many vehicles installed on the ship, in order to reduce the time and logic of calculation and judgment, the vehicles can also be divided into zones, and a vehicle zone distribution board is set between the vehicle distribution board 32 and the charging and discharging ground plug 2. The vehicle zone distribution board is electrically connected to the charging and discharging ground plug 2 and the vehicle distribution board 32 of each zone. Each zone distribution board is provided with a detection unit 34. The detection unit 34 obtains the phase information of the power battery 1 corresponding to each zone and sends it to the control unit 33. When the control unit 33 determines that the phase information of the power battery 1 of the zone is the same, the path between the vehicle zone distribution board and the charging and discharging ground plug 2 of the zone is controlled to be connected, so that the power battery 1 charges the ship distribution board 31. In addition, when the phase information of the power batteries 1 of one of the zones is the same, the remaining zones only need to ensure that the phase information is the same as that of the first zone, and there is no need to set a reference phase or other methods to achieve the same phase information of the remaining zones.

[0056] Optionally, when the discharge mode 5 is turned on, the control unit 33 is also used to obtain the charge state of the vehicle's power battery 1 through the charging and discharging ground plug 2 to determine the number of vehicles whose charge state is lower than a preset charge, and determine the power of the ship distribution board 31 required to charge the vehicle's power battery 1 according to the number of vehicles, query the total power of the ship distribution board 31, and control the ship distribution board 31 to discharge the vehicle's power battery 1 through the vehicle distribution board 32 and the charging and discharging ground plug 2 according to the queried total power of the ship distribution board 31 and the required power of the ship distribution board 31, until the charge state of the vehicle's power battery 1 reaches the preset charge.

[0057] Optional, Figure 8 A schematic diagram of the structure of a fourth PCTC reversible charge and discharge system provided in an embodiment of the present invention, referring to Figure 8 As shown, the system also includes a ship generator 35; the ship generator 35 is electrically connected to the control unit 33 and the ship distribution board 31 respectively, and the control unit 33 is also used to control the ship generator 35 to start when the total power of the queried ship distribution board 31 does not meet the required power of the ship distribution board 31, so that the ship generator 35 charges the ship distribution board 31; the control unit 33 is also used to query the remaining power of the ship distribution board 31 when the charge state of the vehicle's power battery 1 reaches a preset charge, and control the ship generator 35 to keep it on or off according to the remaining power 31.

[0058] The ship generator 35 is used to charge the ship switchboard 31 to increase the power of the ship switchboard 31 .

[0059] Specifically, when the control unit 33 controls the discharge mode 5 to be turned on, it indicates that the ship switchboard 31 is required to discharge the power battery 1 at this time to increase the power of the power battery 1. In this embodiment, the control unit 33 determines the number of vehicles whose state of charge of the power battery 1 is lower than the preset charge according to the acquired state of charge of the power battery 1. After determining the number of vehicles, it is necessary to determine the power of the ship switchboard 31 required to charge the power batteries 1 of the number of vehicles according to the number of vehicles. In addition, after the control unit 33 determines the power of the ship switchboard 31 required for the power battery 1, it is also necessary to determine the total power of the ship switchboard 31 at this time, so as to determine whether the ship switchboard 31 can meet the power of the ship switchboard 31 required for charging the power battery 1. When the control unit 33 determines that the power of the ship switchboard 1 at this time meets the power of the ship switchboard 31 required for charging the power battery 1, it can directly control the ship switchboard 31 to discharge the power battery 1 of the vehicle through the vehicle switchboard 32 and the charging and discharging ground plug 2 until the state of charge of the power battery 1 of the vehicle reaches the preset charge.

[0060] When the control unit 33 determines that the power of the ship distribution board 31 is insufficient to meet the power of the ship distribution board 31 required for charging the power battery 1, the ship generator 35 can be controlled to start, so that the ship generator 35 charges the ship distribution board 31, so that the power of the ship distribution board 31 is increased to meet the power of the ship distribution board 31 required for charging the power battery 1. When the control unit 33 determines that the power of the ship distribution board 31 meets the power of the ship distribution board 31 required for charging the power battery 1, the ship distribution board 31 will be controlled to discharge the power battery 1 of the vehicle through the vehicle distribution board 32 and the charging and discharging ground plug 2 until the state of charge of the power battery 1 of the vehicle reaches the preset charge. After the state of charge of the power battery 1 reaches the preset charge, the control unit 33 will also query the remaining power of the ship distribution board 31, and when it is determined that the remaining power of the ship distribution board 31 is higher than the preset remaining power, the preset remaining power can be 40% to 50% of the power size, for use by other electrical equipment on the ship, which can be determined according to actual conditions and is not limited here. When the control unit 33 determines that the remaining power of the ship switchboard 31 is higher than the preset remaining power, the ship generator 35 will be controlled to shut down. When the control unit 33 determines that the remaining power of the ship switchboard 31 is lower than the preset remaining power, the ship generator 35 will be controlled to continue working until the remaining power of the ship switchboard 31 is higher than the preset remaining power, and then the ship generator 35 can be controlled to shut down.

[0061] Optional, Fig. 9 A schematic diagram of the structure of the fifth PCTC reversible charge and discharge system provided in an embodiment of the present invention, referring to Figure 8 and Fig. 9 As shown, the system also includes a reactive power module 7; the reactive power module 7 is electrically connected between the vehicle distribution board 32 and the electrical load 8 of the ship, and the reactive power module 7 includes a voltage detection unit 74, which is electrically connected to the control unit 33. The voltage detection unit 74 is used to detect the bus voltage of the vehicle distribution board 32 and send the bus voltage to the control unit 33. The control unit 33 is also used to provide reactive power compensation to the electrical load 8 when the bus voltage is lower than a preset range of the rated voltage until the bus voltage reaches the rated voltage.

[0062] The reactive power module 7 provides or absorbs reactive power by adding a compensation device, such as a parallel inductor, in the power system, thereby improving the power factor of the system, reducing the transmission of reactive power, reducing line losses, and improving the load capacity of the system. In addition, the power load 8 is usually a high-power inductive load such as an electric motor.

[0063] Specifically, after the ship's switchboard 31 is charged, it is necessary to supply power to the electric load 8 so that the electric load 8 can work. The ship's electric load 8 needs to obtain a certain amount of reactive power from the ship's power grid during operation and starting. Usually, the ship's power grid includes the ship's switchboard 31. When the power battery 1 of the new energy vehicle is used as a power source to supply power to the ship's switchboard 31, since the power factor of the AC power released by the vehicle is close to 1, that is, the power composition of the vehicle's power battery 1 is mostly active power, and reactive power is very small, the power provided by the power battery 1 may not be able to meet the demand of the ship's power grid for reactive power, that is, the reactive power provided by the power battery 1 is insufficient, resulting in excessive transient voltage drop in the ship's power grid, and the electric load 8 cannot start working normally. Therefore, it is necessary to set a reactive power module 7 between the busbar of the vehicle's switchboard 32 and the high-power electric load 8. When the vehicle's switchboard 32 supplies power to the electric load 8, the reactive power module 7 will detect the busbar voltage of the vehicle's switchboard 32, and determine whether reactive power compensation is required based on the relationship between the busbar voltage and the rated voltage. When the reactive power module 7 determines that the bus voltage is lower than the preset range of the rated voltage, it indicates that the transient voltage drop of the ship power grid is too large at this time, and it is necessary to provide reactive power compensation to the power load 8 until the bus voltage reaches the rated voltage. The preset range of the rated voltage can be set according to actual conditions and is not limited here. Exemplarily, the preset range of the rated voltage can be 20% of the rated voltage. When the reactive power module 7 determines that the bus voltage reaches the rated voltage, it indicates that the transient voltage drop of the ship power grid is very small at this time, and there is no need to perform reactive power compensation, so the reactive power compensation for the power load 8 is stopped.

[0064] Optional, continue to refer to Fig. 9 As shown, the reactive power module 7 includes an uninterruptible power supply unit 71 and a reactive power regulating unit 72; the uninterruptible power supply unit 71 and the reactive power regulating unit 72 are connected in parallel and are located between the vehicle distribution board 32 and the power load 8; the uninterruptible power supply unit 71 is used to supply power to the power load 8 when the reactive power regulating unit 72 is not working; the reactive power regulating unit 72 is used to provide reactive power compensation to the power load 8 when the bus voltage is lower than a preset range of the rated voltage, so that the bus voltage reaches the rated voltage.

[0065] The uninterruptible power supply unit 71 (UPS) is a power device used to continuously supply power to the power load 8 to avoid power failure, disorder, etc. of the power load 8. The reactive power regulation unit 72 is a circuit structure that performs reactive power compensation on the ship power grid to ensure the normal operation of the power load 8 when the ship power grid has an instantaneous excessive voltage drop.

[0066] Specifically, before the electric load 8 is started, reactive power compensation is not required, and the reactive power regulating unit 72 does not work. At this time, the uninterruptible power supply unit 71 needs to work to supply power to the electric load 8 and prepare for the start of the electric load 8. After the electric load 8 is started, by obtaining the bus voltage of the vehicle distribution board 32, when the bus voltage is lower than the preset range of the rated voltage, the reactive power regulating unit 72 works to provide reactive power compensation for the ship power grid, ensuring that the electric load 8 can start normally after reactive power compensation.

[0067] Optional, continue to refer to Fig. 9 As shown, the reactive power module 7 also includes a switch control unit 73, and the uninterruptible power supply unit 71 includes an uninterruptible power supply 711, a first switch 712 and a second switch 713; the uninterruptible power supply 711 is electrically connected between the first switch 712 and the second switch 713, the first switch 712 is electrically connected to the vehicle distribution board 32, and the second switch 713 is electrically connected to the power load 8; the switch control unit 73 is electrically connected to the first switch 712 and the second switch 713 respectively, and is used to control the first switch 712 and the second switch 713 to be closed when the reactive power adjustment unit 72 is not working; and to control the first switch 712 and the second switch 713 to be opened when reactive power compensation is provided to the power load 8; the switch control unit 73 is also used to control the second switch 713 and the first switch 712 to be closed in sequence when the bus voltage reaches the rated voltage.

[0068] Optional, continue to refer to Fig. 9 As shown, the reactive power module 7 also includes a switch control unit 73, and the reactive power adjustment unit 72 includes a compensation inductor 721, a third switch 722 and a fourth switch 723; the compensation inductor 721 is electrically connected between the third switch 722 and the fourth switch 723, the third switch 722 is electrically connected to the vehicle distribution board 32, and the fourth switch 723 is electrically connected to the power load 8; the switch control unit 73 is electrically connected to the third switch 722 and the fourth switch 723 respectively, and is used to control the third switch 722 and the fourth switch 723 to be closed when the bus voltage is lower than a preset range of the rated voltage; and to control the third switch 722 to be opened when the bus voltage reaches the rated voltage.

[0069] The switch control unit 73 is used to control the on and off of the switch. The compensation inductor 721 is used to perform voltage compensation on the bus voltage so that the bus voltage reaches the rated voltage.

[0070] Specifically, before the electrical load 8 is started, it is necessary to supply power to the electrical load 8 in advance. At this time, the switch control unit 73 will control the first switch 712 and the second switch 713 to close, so that the path of the uninterruptible power supply unit 71 is turned on, so that the electric energy of the vehicle distribution board 32 can be transmitted to the electrical load 8 after supplying power to the uninterruptible power supply unit 71, preparing for the starting of the electrical load 8. After the power load 8 is started, the control unit 33 will obtain the bus voltage collected by the voltage detection unit 72. When the control unit 33 determines that the bus voltage is lower than the preset range of the rated voltage, it indicates that the instantaneous voltage drop of the ship power grid is too large and reactive power compensation is required. Then the switch control unit 73 will control the first switch 712 to be disconnected, and control the third switch 722 and the fourth switch 723 to be closed, so that the compensation inductor 721 works and the reactive power compensation is performed on the power load 8. At this time, the switch control unit 73 will control the second switch 713 to be disconnected, so that the uninterruptible power supply 711 exits the power supply circuit, and the voltage detection unit 74 continues to detect the bus voltage of the vehicle distribution board 32 until the bus voltage reaches the rated voltage. When the bus voltage reaches the rated voltage, the reactive power compensation is completed and the power load 8 works normally. Therefore, it is necessary to exit the reactive power adjustment unit 72 from the compensation circuit, and continue to supply power to the power load 8 through the uninterruptible power supply unit 71 to ensure normal operation. Therefore, the switch control unit 73 will first control the closing of the second switch 713 to connect the uninterruptible power supply 711 to the power supply circuit, and then control the closing of the first switch 712 and the opening of the third switch 722 to use the electrical load 8 to work.

[0071] Optionally, the uninterruptible power supply unit 71 includes a first switch 712 , and the first switch 712 and the third switch 722 are interlocked.

[0072] In this embodiment, the first switch 712 and the third switch 722 are interlocked, that is, when the switch control unit 73 controls the first switch 712 to be closed, the corresponding third switch 722 is in an open state. When the first switch 712 is opened, the corresponding third switch 722 is in a closed state. This can simplify the control logic, save time, and improve efficiency.

[0073] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0074] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A PCTC reversible charge and discharge system, characterized in that: It includes the vehicle's power battery, multiple charging and discharging ground sockets, ship power distribution module, charging mode and discharging mode; The ship power distribution module includes a ship power distribution board and a vehicle power distribution board, the power battery of the vehicle is electrically connected to the vehicle power distribution board through the charging and discharging plug, and the vehicle power distribution board is also electrically connected to the ship power distribution board; The ship power distribution module also includes a control unit, which is electrically connected to each of the charging and discharging ground plugs, the charging mode and the discharging mode respectively, and the control unit is used to obtain the charge state of the power battery through each of the charging and discharging ground plugs, and determine to start the charging mode or the discharging mode according to the charge state; when the charging mode is turned on, the power battery of the vehicle charges the ship distribution board through the charging and discharging ground plug and the vehicle distribution board; when the discharging mode is turned on, the ship distribution board discharges the power battery of the vehicle through the vehicle distribution board and the charging and discharging ground plug.

2. The system according to claim 1, characterized in that The ship power distribution module further includes a detection unit, which is electrically connected to each of the charging and discharging ground plugs and the control unit respectively; When the charging mode is turned on, the detection unit is used to collect discharge status information of the power battery corresponding to the vehicle through each of the charging and discharging plugs, and send the collected discharge status information of the multiple power batteries to the control unit; The control unit is also used to obtain a plurality of the discharge status information, and when each of the discharge status information is the same, perform a grid-connected operation so that the power battery of the vehicle charges the ship distribution board through the charging and discharging plug and the vehicle distribution board.

3. The system according to claim 2, characterized in that Also includes a plurality of switches; the discharge state information includes at least phase information; The number of the switches is the same as the number of the charging and discharging ground plugs, and the switches are located between the vehicle distribution board and the charging and discharging ground plugs; each of the switches is electrically connected to the control unit; When the charging mode is turned on, the control unit is also used to control one of the switches to close, and obtain the phase information of the power battery of the vehicle corresponding to the closed switch, taking the phase information of the power battery of the vehicle corresponding to the closed switch as the reference phase, obtaining multiple phase information of the power batteries of the vehicle corresponding to the remaining unclosed switches at preset intervals, and when each phase information is the same as the reference phase, controlling the remaining unclosed switches to close to perform the grid-connected operation.

4. The system according to claim 1, characterized in that When the discharge mode is turned on, the control unit is further used to obtain the charge state of the power battery of the vehicle through the charging and discharging plug to determine the number of vehicles whose charge state is lower than a preset charge, and determine the power of the ship distribution board required to charge the power battery of the vehicle according to the number of vehicles, query the total power of the ship distribution board, and control the ship distribution board to discharge the power battery of the vehicle through the vehicle distribution board and the charging and discharging plug according to the queried total power of the ship distribution board and the required power of the ship distribution board until the charge state of the power battery of the vehicle reaches the preset charge.

5. The system according to claim 4, characterized in that Also included are ship generators; The ship generator is electrically connected to the control unit and the ship switchboard respectively, and the control unit is further used to control the ship generator to start when the total power of the queried ship switchboard does not meet the required power of the ship switchboard, so that the ship generator charges the ship switchboard; The control unit is also used to query the remaining power of the ship switchboard when the charge state of the power battery of the vehicle reaches the preset charge amount, and control the ship generator to remain on or off according to the remaining power.

6. The system according to claim 1, characterized in that Also included is a reactive power module; The reactive power module is electrically connected between the vehicle distribution board and the electrical load of the ship. The reactive power module includes a voltage detection unit, which is electrically connected to the control unit. The voltage detection unit is used to detect the bus voltage of the vehicle distribution board and send the bus voltage to the control unit. The control unit is also used to provide reactive power compensation to the electrical load when the bus voltage is lower than a preset range of the rated voltage until the bus voltage reaches the rated voltage.

7. The system according to claim 6, characterized in that The reactive power module includes an uninterruptible power supply unit and a reactive power adjustment unit; The uninterruptible power supply unit is connected in parallel with the reactive power regulation unit and is located between the vehicle power distribution board and the power load; The uninterruptible power supply unit is used to supply power to the power load when the reactive power regulation unit is not working; The reactive power regulating unit is used to provide the reactive power compensation to the power load when the bus voltage is lower than a preset range of the rated voltage, so that the bus voltage reaches the rated voltage.

8. The system according to claim 7, characterized in that The reactive power module further includes a switch control unit, and the uninterruptible power supply unit includes an uninterruptible power supply, a first switch and a second switch; The uninterruptible power supply is electrically connected between the first switch and the second switch, the first switch is electrically connected to the vehicle power distribution board, and the second switch is electrically connected to the power load; The switch control unit is electrically connected to the first switch and the second switch respectively, and is used to control the first switch and the second switch to be closed when the reactive power adjustment unit is not working; and when providing the reactive power compensation to the electrical load, controlling the first switch and the second switch to be disconnected; The switch control unit is further configured to control the second switch and the first switch to close in sequence when the bus voltage reaches the rated voltage.

9. The system according to claim 7, characterized in that The reactive power module further includes a switch control unit, and the reactive power adjustment unit includes a compensation inductor, a third switch and a fourth switch; The compensation inductor is electrically connected between the third switch and the fourth switch, the third switch is electrically connected to the vehicle power distribution board, and the fourth switch is electrically connected to the power load; The switch control unit is electrically connected to the third switch and the fourth switch, respectively, and is used to control the third switch and the fourth switch to close when the bus voltage is lower than a preset range of the rated voltage; and to control the third switch to open when the bus voltage reaches the rated voltage.

10. The system according to claim 9, characterized in that The uninterruptible power supply unit includes a first switch, and the first switch and the third switch are interlocked.

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