Energy storage vehicle and medium and low voltage power supply vehicle cooperative power supply system and control method

Abstract

The invention provides an energy storage vehicle and medium-low voltage power supply vehicle cooperative power supply system and a control method, and the system consists of a power distribution network, a medium-voltage diesel generator power supply vehicle, an energy storage vehicle, and a low-voltage diesel generator power supply vehicle. The system mainly comprises a commercial power input end, a load output end, a grid-connected and off-grid switching cabinet, an energy storage converter, a lithium battery, an auxiliary power distribution cabinet and an energy storage vehicle controller. According to the invention, through a combined power protection operation mode taking the energy storage vehicle as a main part and the diesel generator power supply vehicle as an auxiliary part, different control strategies are designed according to voltage classes, rated power and distribution network transformer capacity of the energy storage vehicle and the diesel generator power supply vehicle and according to grid-connected capacity increasing and grid-connected and off-grid power supply scenes, the economic and environment-friendly characteristics of the energy storage vehicle are exerted, and meanwhile, the capacity limitation of the energy storage vehicle is solved; the vehicle utilization rate is improved, the power protection operation scene is expanded, and through wireless communication, the limitation of power grid power protection operation distribution network areas and operation site subareas is solved based on wireless grid-connected power distribution and start-stop control of 5G or an ad hoc network.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply vehicles, in particular to a coordinated power supply system of an energy storage vehicle and a medium-low voltage power supply vehicle and a control method. BACKGROUND

[0002] In emergency power supply or temporary power supply scenarios, such as power recovery after natural disasters, temporary power supply for large events, etc., mobile power supply equipment is often needed. At present, the commonly used mobile power supply equipment mainly includes energy storage vehicles and medium-low voltage diesel generator power supply vehicles. Energy storage vehicles are concerned for their environmental protection and low noise, but their continuous power supply capacity is insufficient due to the limitation of energy storage capacity, and they are difficult to meet the demand alone in long-time or large-load power supply scenarios. Medium-low voltage diesel generator power supply vehicles can provide larger power output and longer continuous power supply time through burning diesel, but they are low in efficiency, high in fuel consumption, poor in economy, and produce a lot of exhaust emissions and noise pollution, which does not meet the environmental protection requirements.

[0003] The use of energy storage vehicles or medium-low voltage diesel generator power supply vehicles alone has certain defects, and cannot meet the requirements of power supply stability, economy and environmental protection at the same time. Therefore, how to realize the efficient coordinated power supply of energy storage vehicles and medium-low voltage diesel generator power supply vehicles has become a problem to be solved at present. There are also fixed diesel storage combined power supply and energy storage power stations at present, but the existing diesel storage combined power supply and energy storage power stations are connected by wired communication, suitable for fixed installation of micro-grid diesel storage equipment, with distribution network transformer capacity, switch capacity and cable carrying capacity corresponding to the control strategy, and the diesel generator power supply vehicle and the energy storage vehicle are limited by vehicle space and total mass, and the switch capacity and cable carrying capacity can only meet the rated current, so the control method is quite different from that of the fixed diesel storage combined power supply and energy storage power station, and therefore it is not suitable for emergency power supply operation scenarios of the power department. SUMMARY

[0004] The purpose of the present application is to solve the technical problems raised in the background.

[0005] The present application adopts the following technical scheme: a coordinated power supply system of an energy storage vehicle and a medium-low voltage power supply vehicle mainly composed of a power distribution network, a medium-voltage diesel generator power supply vehicle, an energy storage vehicle and a low-voltage diesel generator power supply vehicle, wherein the power distribution network includes a medium-voltage 10kV line, a medium-voltage switch, a distribution network transformer, a low-voltage 0.4kV line and a low-voltage sectionalizing / junction switch; the medium-voltage diesel generator power supply vehicle is connected to the load side of the medium-voltage switch through a load output cable, the energy storage vehicle is connected to the power supply side and the load side of the low-voltage sectionalizing / junction switch through a power input cable and a load output cable respectively, and the low-voltage diesel generator power supply vehicle is connected to the load side of the low-voltage sectionalizing / junction switch through a load output cable.

[0006] The energy storage vehicle is internally provided with an energy storage device, mainly comprising a commercial power input end, a load output end, an on-off grid switching cabinet, an energy storage converter, a lithium battery, an auxiliary power distribution cabinet and an energy storage vehicle controller, the energy storage vehicle controller is connected with the on-off grid switching cabinet and the energy storage converter through a line, and the energy storage converter is connected with the lithium battery through a line.

[0007] Preferably, the controller is arranged on the medium-pressure diesel generator vehicle, the energy storage vehicle and the low-pressure diesel generator vehicle, and the controller is internally provided with a wireless communication device, the wireless communication device mainly comprises an RS485-to-com communication module, an IO-to-com communication module, a 5G network card communication module and an ad hoc network communication module, wherein the RS485-to-com communication module is used for conversion of power management communication, and the IO-to-com communication module is used for conversion of start-stop signals of the diesel generator vehicle; the energy storage vehicle controller realizes power management and start-stop machine control of the medium-pressure diesel generator vehicle and the low-pressure diesel generator vehicle through the 5G network card communication module or the ad hoc network communication module.

[0008] A kind of energy storage vehicle and low-pressure diesel generator vehicle grid-connected capacity-increasing collaborative operation control method, comprising the following steps:

[0009] Step one: commercial power input cable and load output cable are respectively connected to the power side and load side of low-voltage sectioning / boundary switch under electricity;

[0010] Step two: the on-off grid switching cabinet is closed by operating the energy storage vehicle controller, and the commercial power input end and the load output end form a bypass power supply with the low-voltage sectioning / boundary switch, the low-voltage sectioning / boundary switch is pulled, and the commercial power provides load to the load side through the commercial power input end and the load output end;

[0011] Step three: the energy storage converter is started to carry out grid connection by operating the energy storage vehicle controller, and the lithium battery is charged if necessary;

[0012] Step four: according to the dispatching instruction or the transformer load working condition, the lithium battery 105 is invertered through the energy storage converter by operating the energy storage vehicle controller, and the load side is grid-connected and capacity-increased through the load output end;

[0013] Step five: when the lithium battery is low in SOC, the energy storage vehicle controller sends a start signal to the low-pressure diesel generator vehicle, the low-pressure diesel generator vehicle is started and then carries out grid connection, and the load is transferred according to the power distribution of the energy storage vehicle controller;

[0014] Step six: the energy storage converter stops inverting output and is converted to charge the lithium battery under the control of the energy storage vehicle controller;

[0015] Step seven: when the lithium battery is fully charged, the energy storage vehicle controller controls the energy storage converter to carry out grid connection;

[0016] Step eight: after the energy storage converter is grid-connected, the power of the low-pressure diesel generator vehicle is transferred to the energy storage vehicle;

[0017] Step nine: the energy storage vehicle controller sends a stop signal to the low-pressure diesel generator power vehicle, and the low-pressure diesel generator power vehicle is turned off;

[0018] Step ten: during capacity expansion, the energy storage vehicle and the low-pressure diesel generator power vehicle repeat steps five to nine. When noise control is required, set the energy storage vehicle operation time point on the energy storage vehicle controller, and use the low noise characteristics of the energy storage vehicle to reduce noise disturbance;

[0019] Step eleven: the energy storage vehicle controller controls the energy storage converter to be connected to the grid and controls the low-pressure diesel generator power vehicle to be turned off;

[0020] Step twelve: close the low-voltage section / boundary switch, the energy storage vehicle controller disconnects and off-grid switching cabinet and controls the energy storage converter to be turned off, and the live power cable and load output cable are removed.

[0021] An energy storage vehicle and medium-pressure diesel generator power vehicle off-grid collaborative operation control method and an energy storage vehicle and low-pressure diesel generator power vehicle off-grid collaborative operation control method, comprising the following steps:

[0022] Step one: the power cable and the load output cable are respectively connected to the power side and the load side of the low-voltage section / boundary switch under live connection;

[0023] Step two: operate the energy storage vehicle controller to close the off-grid switching cabinet, the power input end and the load output end form a low-voltage section / boundary switch bypass power supply, and the low-voltage section / boundary switch is pulled open;

[0024] Step three: operate the energy storage vehicle controller to start the energy storage converter to be connected to the grid, and charge the lithium battery if necessary;

[0025] Step four: the low-voltage section / boundary switch power side fails and the power is cut off, the energy storage vehicle controller automatically disconnects the off-grid switching cabinet, the lithium battery is inverted through the energy storage converter, and the load side is supplied with power through the load output end;

[0026] Step five: disconnect the medium-voltage switch;

[0027] Step six: enter the medium-pressure diesel generator power vehicle and energy storage vehicle operation mode, and the steps are as follows:

[0028] ① When the lithium battery SOC is low, the energy storage vehicle controller sends a start signal to the medium-pressure diesel generator power vehicle, the medium-pressure diesel generator power vehicle starts to be connected to the grid, and the load is transferred according to the power distribution of the energy storage vehicle controller;

[0029] ② After the load is transferred to the medium-pressure diesel generator power vehicle, the energy storage vehicle controller sends an off-grid signal to the medium-pressure diesel generator power vehicle, and the medium-pressure diesel generator power vehicle operates off-grid;

[0030] ③ The energy storage vehicle controller controls the energy storage converter to stop inverting capacity expansion and turns to charge the lithium battery;

[0031] ④The lithium battery is fully charged, and the energy storage vehicle controller controls the energy storage converter to grid connect;

[0032] ⑤The medium-voltage switch power supply side restores power supply, and after the energy storage converter grid connects, the power of the medium-voltage diesel generator power supply vehicle is transferred to the energy storage vehicle;

[0033] ⑥The energy storage vehicle controller sends a shutdown signal to the medium-voltage diesel generator power supply vehicle, and the medium-voltage diesel generator power supply vehicle is shut down;

[0034] ⑦The medium-voltage switch is closed, the energy storage vehicle controller closes the on-grid and off-grid switching cabinet to complete on-grid with the power grid, and the energy storage converter is converted into a voltage source;

[0035] ⑧The low-voltage section / boundary switch is closed, the energy storage vehicle controller disconnects the on-grid and off-grid switching cabinet and controls the energy storage converter to stop, and the live input cable and load output cable are removed;

[0036] Step seven: enter the low-voltage diesel generator power supply vehicle and energy storage vehicle operation mode according to step five, and the steps are as follows:

[0037] ①When the lithium battery has a low SOC, the energy storage vehicle controller sends a start signal to the low-voltage diesel generator power supply vehicle, and after the low-voltage diesel generator power supply vehicle starts, it performs grid connection and load transfer according to the power distribution of the energy storage vehicle controller;

[0038] ②After the load is transferred to the low-voltage diesel generator power supply vehicle, the energy storage vehicle controller sends an off-grid signal to the low-voltage diesel generator power supply vehicle, and the low-voltage diesel generator power supply vehicle is converted into off-grid operation;

[0039] ③The energy storage vehicle controller controls the energy storage converter to stop inverting and increasing capacity, and is converted into charging the lithium battery;

[0040] ④The lithium battery is fully charged, and the energy storage vehicle controller controls the energy storage converter to grid connect;

[0041] ⑤The medium-voltage switch power supply side restores power supply, and after the energy storage converter grid connects, the power of the low-voltage diesel generator power supply vehicle is transferred to the energy storage vehicle;

[0042] ⑥The energy storage vehicle controller sends a shutdown signal to the low-voltage diesel generator power supply vehicle, and the low-voltage diesel generator power supply vehicle is shut down;

[0043] ⑦The medium-voltage switch is closed, the energy storage vehicle controller closes the on-grid and off-grid switching cabinet to complete on-grid with the power grid, and the energy storage converter is converted into a voltage source;

[0044] ⑧The low-voltage section / boundary switch is closed, the energy storage vehicle controller disconnects the on-grid and off-grid switching cabinet and controls the energy storage converter to stop, and the live input cable and load output cable are removed.

[0045] A control method for on-grid and off-grid collaborative operation of an energy storage vehicle and a medium-voltage diesel generator power supply vehicle and a low-voltage diesel generator power supply vehicle, comprising the following steps:

[0046] Step one: the power input cable and the load output cable are respectively connected to the power side and the load side of the low-voltage sectionalizing / disconnecting switch;

[0047] Step two: the energy storage vehicle controller is operated to close the on-off switch cabinet, the power input end and the load output end form a bypass power supply of the low-voltage sectionalizing / disconnecting switch, and the low-voltage sectionalizing / disconnecting switch is pulled out;

[0048] Step three: the energy storage vehicle controller is operated to start the energy storage converter to perform grid connection, and the lithium battery is charged if necessary;

[0049] Step four: the power side of the low-voltage sectionalizing / disconnecting switch is powered off, the energy storage vehicle controller is automatically disconnected and the on-off switch cabinet is off-grid, the lithium battery is inverted through the energy storage converter, and the load side is powered through the load output end;

[0050] Step five: the medium-voltage switch is turned off, when the lithium battery of the energy storage vehicle is low in SOC, the energy storage vehicle controller sends a start signal to the medium-voltage diesel generator power vehicle and the low-voltage diesel generator power vehicle;

[0051] Step six: the medium-voltage diesel generator power vehicle and the low-voltage diesel generator power vehicle are started to perform grid connection, and the energy storage vehicle controller distributes the load power of the energy storage vehicle to the medium-voltage diesel generator power vehicle and the low-voltage diesel generator power vehicle according to the optimal fuel power value of the generator set;

[0052] Step seven: the energy storage vehicle controller controls the energy storage converter to stop inverting and increasing capacity, and turns to charge the lithium battery;

[0053] Step eight: the lithium battery is fully charged, and the energy storage vehicle controller controls the energy storage converter to perform grid connection;

[0054] Step nine: the power side of the medium-voltage switch is restored to power, and after the energy storage converter is connected to the grid, the power of the medium-voltage diesel generator power vehicle and the low-voltage diesel generator power vehicle is transferred to the energy storage vehicle;

[0055] Step ten: the energy storage vehicle controller sends a shutdown signal to the medium-voltage diesel generator power vehicle and the low-voltage diesel generator power vehicle, and the medium-voltage diesel generator power vehicle and the low-voltage diesel generator power vehicle are turned off;

[0056] Step eleven: the medium-voltage switch is closed, the energy storage vehicle controller is operated to close the on-off switch cabinet, the grid connection is completed, and the energy storage converter turns to be a voltage source;

[0057] Step twelve: the low-voltage sectionalizing / disconnecting switch is closed, the energy storage vehicle controller is disconnected and the on-off switch cabinet is off-grid, and the energy storage converter is stopped, and the power input cable and the load output cable are removed under power.

[0058] Compared with the prior art, the advantages and positive effects of the present application are that,

[0059] 1. The present application is a combined power protection operation mode mainly using energy storage vehicles and supplemented by diesel generator vehicles. The economic and environmental characteristics of energy storage vehicles are utilized, and the capacity limitation of energy storage vehicles is also solved. 10kV medium voltage diesel generator vehicles, 0.4kV low voltage diesel generator vehicles and 0.4kV low voltage energy storage vehicles are used for coordinated power supply, which improves vehicle utilization and expands the power protection operation scene;

[0060] 2. The present application adjusts the operation mode of energy storage vehicles and diesel generator vehicles according to the daytime and night rest time of the public, reduces the noise disturbance of diesel generator vehicles, and improves the noise disturbance of diesel generator vehicles.

[0061] 3. The present application solves the limitation of power grid power protection operation distribution network area and operation site partitioning through wireless communication between energy storage vehicles and medium and low voltage diesel generator vehicles, i.e. wireless grid-connected power distribution and start-stop control based on 5G or ad hoc network. At the same time, according to the voltage level, rated power and distribution network transformer capacity of energy storage vehicles and diesel generator vehicles, different control strategies are designed according to grid-connected capacity increase, grid-connected and off-grid power supply scenes. According to the existing configuration of 10kV medium voltage diesel generator vehicles and 0.4kV low voltage diesel generator vehicles, the coordinated power supply of 10kV medium voltage diesel generator vehicles and 0.4kV low voltage diesel generator vehicles and energy storage vehicles or the coordinated power supply of 10kV medium voltage diesel generator vehicles and energy storage vehicles and the coordinated power supply of 0.4kV low voltage diesel generator vehicles and energy storage vehicles can be flexibly selected to improve fuel economy. BRIEF DESCRIPTION OF DRAWINGS

[0062] Figure 1 The schematic diagram of the line connection of the present application is shown in the figure;

[0063] Figure 2 The schematic diagram of the energy storage device connection of the energy storage vehicle is shown in the figure;

[0064] Figure 3 The schematic diagram of the wireless communication composition of the single vehicle controller is shown in the figure;

[0065] Figure 4 The schematic diagram of the grid-connected capacity increase operation control steps of the energy storage vehicle and the low voltage diesel generator vehicle is shown in the figure;

[0066] Figure 5 The schematic diagram of the grid-connected and off-grid coordinated operation control steps of the energy storage vehicle and the medium voltage diesel generator vehicle and the low voltage diesel generator vehicle is shown in the figure;

[0067] Figure 6 The schematic diagram of the grid-connected and off-grid coordinated operation control steps of the energy storage vehicle and the medium voltage diesel generator vehicle and the low voltage diesel generator vehicle is shown in the figure.

[0068] Legend: 001 medium voltage 10kV line, 002 medium voltage switch, 003 distribution network transformer, 004 low voltage 0.4kV line, 005 low voltage sectionalizing / boundary switch, 006 medium voltage diesel generator power car, 007 energy storage car, 008 low voltage diesel generator power car, 010 commercial power input cable, 009 load output cable;

[0069] 101 commercial power input end, 102 load output end, 103 grid-connected / off-grid switching cabinet, 104 energy storage converter, 105 lithium battery, 106 auxiliary power distribution cabinet, 107 energy storage car controller. DETAILED DESCRIPTION

[0070] In order to enable the above-mentioned objects, features and advantages of the present application to be more clearly understood, the following will further describe the present application with reference to the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0071] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in different ways from those described herein, and the present application is not limited to the specific embodiments disclosed in the following description.

[0072] Please refer to Figures 1-5 The present application provides a kind of energy storage vehicle and medium-low voltage power car collaborative power supply system, mainly by distribution network, medium voltage diesel generator power car 006, energy storage car 007 And low voltage diesel generator power car 008 are formed, and distribution network includes medium voltage 10kV line 001, medium voltage switch 002, distribution network transformer 003, low voltage 0.4kV line 004 And low voltage sectionalizing / boundary switch 005;Medium voltage diesel generator power car 006 is connected to the load side of medium voltage switch 002 by load output cable 009, energy storage car 007 It is connected to the power side and load side of low voltage sectionalizing / boundary switch 005 by commercial power input cable 010 and load output cable 009 respectively, and low voltage diesel generator power car 008 is connected to the load side of low voltage sectionalizing / boundary switch 005 by load output cable 009.

[0073] As Figure 2The energy storage vehicle 007 shown is equipped with an energy storage device, mainly including a mains input terminal 101, a load output terminal 102, a grid-connected / off-grid switching cabinet 103, an energy storage inverter 104, a lithium battery 105, an auxiliary power distribution cabinet 106, and an energy storage vehicle controller 107. The mains input terminal 101 is connected to the mains input cable 010 and also to the grid-connected / off-grid switching cabinet 103. The load output terminal 102 is connected to the load output cable 009 and also to the grid-connected / off-grid switching cabinet 103, the energy storage inverter 104, and the auxiliary power distribution cabinet 106. The energy storage vehicle controller 107 is connected to the grid-connected / off-grid switching cabinet 103 and the energy storage inverter 104 via wiring, and can control the opening and closing of the grid-connected / off-grid switching cabinet 103 and the start and stop of the energy storage inverter 104. The energy storage inverter 104 is connected to the lithium battery 105 via wiring, and the energy storage vehicle controller 107 can control the energy storage inverter 104 to invert or charge the lithium battery 105.

[0074] like Figure 3 As shown, the medium-voltage diesel generator power supply vehicle 006, energy storage vehicle 007, and low-voltage diesel generator power supply vehicle 008 are all equipped with controllers. Each controller contains a wireless communication device, which mainly consists of an RS485-to-COM communication module, an IO-to-COM communication module, a 5G network card communication module, and a self-organizing network communication module. The RS485-to-COM communication module is used for power management communication conversion, and the IO-to-COM communication module is used for diesel generator power supply vehicle start-stop signal conversion. The energy storage vehicle controller 107 uses the 5G network card communication module or the self-organizing network communication module to achieve power management and start-stop control of the controllers of the medium-voltage diesel generator power supply vehicle 006 and the low-voltage diesel generator power supply vehicle 008, thereby enabling coordinated power supply between the energy storage vehicle 007, the medium-voltage diesel generator power supply vehicle 006, and the low-voltage diesel generator power supply vehicle 008 in emergency situations.

[0075] like Figure 4 As shown, the control method for grid connection and capacity expansion collaboration between energy storage vehicle 007 and low-voltage diesel generator vehicle 008 includes the following steps:

[0076] Step 1: Connect the mains input cable 010 and the load output cable 009 to the power supply side and load side of the low-voltage sectionalizing / separating switch 005 respectively while they are energized;

[0077] Step 2: Operate the energy storage vehicle controller 107 to close and disconnect the grid-connected switching cabinet 103. The mains input terminal 101 and the load output terminal 102 form a bypass power supply with the low-voltage sectionalizing / demarcation switch 005. Open the low-voltage sectionalizing / demarcation switch 005, and the mains power is supplied to the load side through the mains input terminal 101 and the load output terminal 102.

[0078] Step 3: Operate the energy storage vehicle controller 107 to start the energy storage converter 104 for grid connection, and charge the lithium battery 105 if necessary;

[0079] Step four: according to the dispatching instruction or transformer 003 load working condition, operating the energy storage vehicle controller 107 adopts lithium battery 105 through energy storage converter 104 inverter, through the load output end 102 to the load side grid connected capacity expansion;

[0080] Step five: when the lithium battery 105 is low SOC, the energy storage vehicle controller 107 sends a start signal to the low pressure diesel generator power car 008, and the low pressure diesel generator power car 008 starts to grid after starting, and performs load transfer according to the power distribution of the energy storage vehicle controller 107;

[0081] Step six: the energy storage vehicle controller 007 controls the energy storage converter 104 to stop inverting output, and turns to charge the lithium battery 105;

[0082] Step seven: when the lithium battery 105 is fully charged, the energy storage vehicle controller 107 controls the energy storage converter 104 to grid;

[0083] Step eight: after the energy storage converter 104 is grid connected, the power of the low pressure diesel generator power car 008 is transferred to the energy storage vehicle 007;

[0084] Step nine: the energy storage vehicle controller 107 sends a stop signal to the low pressure diesel generator power car 008, and the low pressure diesel generator power car 008 is stopped;

[0085] Step ten: during capacity expansion, the energy storage vehicle 007 and the low pressure diesel generator power car 008 repeat steps five to nine, when noise control is required, set the energy storage vehicle 007 operation time point in the energy storage vehicle controller 107, and use the low noise characteristics of the energy storage vehicle 007 to reduce noise disturbance;

[0086] Step eleven: the energy storage vehicle controller 107 controls the energy storage converter 104 to grid and controls the low pressure diesel generator power car 008 to stop;

[0087] Step twelve: close the low voltage section / boundary switch 005, the energy storage vehicle controller 107 disconnects the off-grid switch cabinet 103 and controls the energy storage converter 104 to stop, and the live power input cable 010 and the load output cable 009 are taken off.

[0088] As shown in Figure 5 The energy storage vehicle 007 and the medium voltage diesel generator power car 006 off-grid collaborative operation control method and the energy storage vehicle 007 and the low pressure diesel generator power car 008 off-grid collaborative operation control method include the following steps:

[0089] Step one: the power input cable 010 and the load output cable 009 are respectively connected to the power side and the load side of the low voltage section / boundary switch 005 under live connection;

[0090] Step two: operate the energy storage vehicle controller 107 to close the off-grid switching cabinet 103, and the power input end 101 and the load output end 102 form a low-voltage section / boundary switch 005 bypass power supply, and the low-voltage section / boundary switch 005 is pulled open;

[0091] Step three: operate the energy storage vehicle controller 107 to start the energy storage converter 104 to go online, and charge the lithium battery 105 if necessary;

[0092] Step four: the power supply side of the low-voltage section / boundary switch 005 is powered off, the energy storage vehicle controller 107 automatically disconnects the off-grid switching cabinet 103, and the lithium battery 105 is inverted through the energy storage converter 104 to supply power to the load side through the load output end 102;

[0093] Step five: disconnect the medium-voltage switch 002;

[0094] Step six: enter the medium-voltage diesel generator power supply vehicle 006 and the energy storage vehicle 007 operation mode, and the steps are as follows:

[0095] ① When the lithium battery 105 has a low SOC, the energy storage vehicle controller 107 sends a start signal to the medium-voltage diesel generator power supply vehicle 006, the medium-voltage diesel generator power supply vehicle 006 starts to go online, and the load transfer is performed according to the power distribution of the energy storage vehicle controller 107;

[0096] ② After the load is transferred to the medium-voltage diesel generator power supply vehicle 006, the energy storage vehicle controller 107 sends an off-grid signal to the medium-voltage diesel generator power supply vehicle 006, and the medium-voltage diesel generator power supply vehicle 006 operates off-grid;

[0097] ③ The energy storage vehicle controller 107 controls the energy storage converter 104 to stop inverting to increase capacity, and turns to charge the lithium battery 105;

[0098] ④ When the lithium battery 105 is fully charged, the energy storage vehicle controller 107 controls the energy storage converter 104 to go online;

[0099] ⑤ The power supply side of the medium-voltage switch 002 is restored, the energy storage converter 104 goes online, and the power of the medium-voltage diesel generator power supply vehicle 006 is transferred to the energy storage vehicle 007;

[0100] ⑥ The energy storage vehicle controller 107 sends a shutdown signal to the medium-voltage diesel generator power supply vehicle 006, and the medium-voltage diesel generator power supply vehicle 006 is turned off;

[0101] ⑦ Close the medium-voltage switch 002, operate the energy storage vehicle controller 107 to close the off-grid switching cabinet 103 to complete the power grid connection with the power supply, and the energy storage converter 104 turns into a voltage source;

[0102] ⑧ Close the low-voltage section / boundary switch 005, the energy storage vehicle controller 107 disconnects the off-grid switching cabinet 103 and controls the energy storage converter 104 to stop, and the power input cable 010 and the load output cable 009 are removed under power;

[0103] Step 7: Following Step 5, enter the operation mode of low-voltage diesel generator power supply vehicle 008 and energy storage vehicle 007. The steps are as follows;

[0104] ① When the lithium battery 105 is at low SOC, the energy storage vehicle controller 107 sends a start signal to the low-voltage diesel generator power vehicle 008. After the low-voltage diesel generator power vehicle 008 starts, it connects to the grid and transfers the load according to the power allocated by the energy storage vehicle controller 107.

[0105] ②After the load is transferred to the low-voltage diesel generator power supply vehicle 008, the energy storage vehicle controller 107 sends an off-grid signal to the low-voltage diesel generator power supply vehicle 008, and the low-voltage diesel generator power supply vehicle 008 switches to off-grid operation;

[0106] ③ The energy storage vehicle controller 107 controls the energy storage converter 104 to stop inverter capacity expansion and switch to charging the lithium battery 105.

[0107] ④ Once the lithium battery 105 is fully charged, the energy storage vehicle controller 107 controls the energy storage converter 104 to connect to the grid.

[0108] ⑤ After the medium-voltage switch 002 restores power supply to the power supply side and the energy storage converter 104 is connected to the grid, the power of the low-voltage diesel generator power supply vehicle 008 is transferred to the energy storage vehicle 007.

[0109] ⑥ The energy storage vehicle controller 107 sends a shutdown signal to the low-voltage diesel generator power supply vehicle 008 to shut down the low-voltage diesel generator power supply vehicle 008;

[0110] ⑦ Close the medium-voltage switch 002, operate the energy storage vehicle controller 107 to close the grid connection switch cabinet 103 to complete the grid connection with the mains power, and the energy storage converter 104 turns into a voltage source;

[0111] ⑧ Close the low-voltage sectional / boundary switch 005, operate the energy storage vehicle controller 107 to disconnect and disconnect the off-grid switching cabinet 103 and control the energy storage converter 104 to stop, and disconnect the mains input cable 010 and the load output cable 009 while energized.

[0112] like Figure 6 As shown, the control method for off-grid collaborative operation of energy storage vehicle 007, medium-voltage diesel generator power supply vehicle 006, and low-voltage diesel generator power supply vehicle 008 includes the following steps:

[0113] Step 1: Connect the mains input cable 010 and the load output cable 009 to the power supply side and load side of the low-voltage sectionalizing / separating switch 005 respectively while they are energized;

[0114] Step 2: Operate the energy storage vehicle controller 107 to close the off-grid switching cabinet 103, so that the mains input terminal 101 and the load output terminal 102 form a bypass power supply for the low-voltage sectional / boundary switch 005, and open the low-voltage sectional / boundary switch 005.

[0115] Step three: the operation of the energy storage vehicle controller 107 starts the energy storage converter 104 to grid connect, and charges the lithium battery 105 if necessary;

[0116] Step four: the low-voltage sectionalizing / boundary switch 005 power side fails, the energy storage vehicle controller 107 automatically disconnects and off-grid switches the cabinet 103, and the lithium battery 105 inverts through the energy storage converter 104 to supply power to the load side through the load output end 102;

[0117] Step five: the medium-voltage switch 002 is turned off, and when the lithium battery 105 of the energy storage vehicle 007 has a low SOC, the energy storage vehicle controller 107 sends a start signal to the medium-voltage diesel generator power vehicle 006 and the low-voltage diesel generator power vehicle 008;

[0118] Step six: the medium-voltage diesel generator power vehicle 006 and the low-voltage diesel generator power vehicle 008 are started to grid connect, and the energy storage vehicle controller 107 distributes the load power of the energy storage vehicle 007 to the medium-voltage diesel generator power vehicle 006 and the low-voltage diesel generator power vehicle 008 according to the optimal fuel power value of the generator set;

[0119] Step seven: the energy storage vehicle controller 107 controls the energy storage converter 104 to stop inverting to increase capacity and turns to charge the lithium battery 105;

[0120] Step eight: the lithium battery 105 is fully charged, and the energy storage vehicle controller 107 controls the energy storage converter 104 to grid connect;

[0121] Step nine: the power supply side of the medium-voltage switch 002 is restored, and after the energy storage converter 104 grid connects, the power of the medium-voltage diesel generator power vehicle 006 and the low-voltage diesel generator power vehicle 008 is transferred to the energy storage vehicle 007;

[0122] Step ten: the energy storage vehicle controller 107 sends a shutdown signal to the medium-voltage diesel generator power vehicle 006 and the low-voltage diesel generator power vehicle 008, and turns off the medium-voltage diesel generator power vehicle 006 and the low-voltage diesel generator power vehicle 008;

[0123] Step eleven: the medium-voltage switch 002 is turned on, the energy storage vehicle controller 107 turns on and off the grid switching cabinet 103 to complete grid connection with the power grid, and the energy storage converter 104 turns into a voltage source;

[0124] Step twelve: the low-voltage sectionalizing / boundary switch 005 is turned on, the energy storage vehicle controller 107 disconnects the off-grid switching cabinet 103 and controls the energy storage converter 104 to shut down, and the live input cable 010 and the load output cable 009 are removed.

[0125] The above merely describes preferred embodiments of the present application, but is not intended to limit the present application to other forms, any person skilled in the art can make changes or modifications to the above disclosed technical contents into equivalent embodiments with equivalent changes, and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the technical solution content of the present application still belongs to the protection scope of the present application technical solution.

Claims

1. A collaborative power supply system for an energy storage vehicle and a medium- and low-voltage power supply vehicle, characterized in that: It mainly consists of a power distribution network, a medium-voltage diesel generator vehicle, an energy storage vehicle, and a low-voltage diesel generator vehicle. The power distribution network includes a medium-voltage 10kV line, a medium-voltage switch, a distribution transformer, a low-voltage 0.4kV line, and a low-voltage sectionalizing / demarcation switch. The medium-voltage diesel generator vehicle is connected to the load side of the medium-voltage switch via a load output cable. The energy storage vehicle is connected to the power supply side and the load side of the low-voltage sectionalizing / demarcation switch via a mains input cable and a load output cable, respectively. The low-voltage diesel generator vehicle is connected to the load side of the low-voltage sectionalizing / demarcation switch via a load output cable. The energy storage vehicle is equipped with an energy storage device, which mainly includes a mains power input terminal, a load output terminal, a grid-connected / off-grid switching cabinet, an energy storage converter, a lithium battery, an auxiliary power distribution cabinet, and an energy storage vehicle controller. The energy storage vehicle controller is connected to the grid-connected / off-grid switching cabinet and the energy storage converter via lines, and the energy storage converter is connected to the lithium battery via lines.

2. The energy storage vehicle and medium- and low-voltage power supply vehicle coordinated power supply system according to claim 1, characterized in that: The medium-voltage diesel generator power supply vehicle, energy storage vehicle, and low-voltage diesel generator power supply vehicle are all equipped with controllers. The controllers contain wireless communication devices, which mainly consist of an RS485 to COM communication module, an IO to COM communication module, a 5G network card communication module, and a self-organizing network communication module. The RS485 to COM communication module is used for power management communication conversion, and the IO to COM communication module is used for diesel generator power supply vehicle start-stop signal conversion. The energy storage vehicle controller realizes power management and start-stop control of the medium-voltage and low-voltage diesel generator power supply vehicles through the 5G network card communication module or the self-organizing network communication module.

3. A method for coordinated grid connection and capacity expansion control of the power supply system of an energy storage vehicle and a low-voltage diesel generator vehicle according to claim 2, characterized in that, Includes the following steps: Step 1: Connect the mains input cable and the load output cable to the power supply side and load side of the low-voltage sectionalizing / separating switch respectively while they are energized; Step 2: Operate the energy storage vehicle controller to close the off-grid switching cabinet, so that the mains input terminal and load output terminal form a bypass power supply with the low-voltage sectionalizing / demarcation switch. Open the low-voltage sectionalizing / demarcation switch, and the mains power is supplied to the load side through the mains input terminal and load output terminal; Step 3: Operate the energy storage vehicle controller to start the energy storage converter for grid connection, and charge the lithium battery if necessary; Step 4: According to the dispatching instructions or transformer load conditions, operate the energy storage vehicle controller to use lithium battery 105 to invert through the energy storage converter and connect to the load side for grid capacity increase through the load output terminal; Step 5: When the lithium battery is at low SOC, the energy storage vehicle controller sends a start signal to the low-voltage diesel generator vehicle. After the low-voltage diesel generator vehicle starts, it connects to the grid and transfers the load according to the power allocated by the energy storage vehicle controller. Step Six: The energy storage vehicle controller controls the energy storage converter to stop inverter output and switch to charging the lithium battery; Step 7: After the lithium battery is fully charged, the energy storage vehicle controller controls the energy storage converter to connect to the grid. Step 8: After the energy storage converter is connected to the grid, the power of the low-voltage diesel generator vehicle is transferred to the energy storage vehicle; Step 9: The energy storage vehicle controller sends a shutdown signal to the low-voltage diesel generator power vehicle to shut down the low-voltage diesel generator power vehicle; Step 10: During the capacity expansion period, the energy storage vehicle and the low-voltage diesel generator vehicle repeat steps 5 to 9. When noise control is required, set the energy storage vehicle's operating time on the energy storage vehicle controller to reduce noise pollution by taking advantage of the low operating noise of the energy storage vehicle. Step 11: The energy storage vehicle controller controls the grid connection of the energy storage converter and controls the shutdown of the low-voltage diesel generator vehicle; Step 12: Close the low-voltage sectional / boundary switch, disconnect the energy storage vehicle controller from the grid switching cabinet and control the energy storage converter to stop, and disconnect the mains input cable and load output cable while the power is on.

4. A method for grid-connected and off-grid coordinated operation control of the energy storage vehicle and the medium-voltage diesel generator power supply system, and the energy storage vehicle and the low-voltage diesel generator power supply system, as described in claim 1, characterized in that... Includes the following steps: Step 1: Connect the mains input cable and the load output cable to the power supply side and load side of the low-voltage sectionalizing / separating switch respectively while they are energized; Step 2: Operate the energy storage vehicle controller to close the off-grid switching cabinet, forming a low-voltage sectional / boundary switch bypass power supply between the mains input terminal and the load output terminal, and open the low-voltage sectional / boundary switch; Step 3: Operate the energy storage vehicle controller to start the energy storage converter for grid connection, and charge the lithium battery if necessary; Step 4: In the event of a power outage due to a fault on the low-voltage segment / boundary switch power supply side, the energy storage vehicle controller will automatically disconnect and switch off-grid. The lithium battery will be inverted by the energy storage converter and supplied to the load side through the load output terminal. Step 5: Disconnect the medium-voltage switch; Step Six: Enter the operation mode of the medium-voltage diesel generator power supply vehicle and energy storage vehicle. The steps are as follows; ① When the lithium battery is at low SOC, the energy storage vehicle controller sends a start signal to the medium-voltage diesel generator vehicle. After the medium-voltage diesel generator vehicle starts, it connects to the grid and transfers the load according to the power allocated by the energy storage vehicle controller. ②After the load is transferred to the medium-voltage diesel generator power vehicle, the energy storage vehicle controller sends an off-grid signal to the medium-voltage diesel generator power vehicle, and the medium-voltage diesel generator power vehicle switches to off-grid operation; ③ The energy storage vehicle controller controls the energy storage converter to stop inverter capacity expansion and switch to charging the lithium battery; ④ Once the lithium battery is fully charged, the energy storage vehicle controller controls the energy storage converter to connect to the grid; ⑤ After the medium-voltage switching power supply is restored and the energy storage converter is connected to the grid, the power of the medium-voltage diesel generator vehicle will be transferred to the energy storage vehicle. ⑥ The energy storage vehicle controller sends a shutdown signal to the medium-voltage diesel generator power supply vehicle to shut down the medium-voltage diesel generator power supply vehicle; ⑦ Close the medium-voltage switch, operate the energy storage vehicle controller to close the grid-connected switching cabinet to complete the grid connection with the mains power, and the energy storage converter becomes a voltage source; ⑧ Close the low-voltage sectional / boundary switch, disconnect the energy storage vehicle controller and the off-grid switching cabinet and control the energy storage converter to stop, and disconnect the mains input cable and load output cable while energized; Step 7: Following Step 5, enter the low-voltage diesel generator power supply vehicle and energy storage vehicle operation mode. The steps are as follows; ① When the lithium battery is at low SOC, the energy storage vehicle controller sends a start signal to the low-voltage diesel generator vehicle. After the low-voltage diesel generator vehicle starts, it connects to the grid and transfers the load according to the power allocated by the energy storage vehicle controller. ②After the load is transferred to the low-voltage diesel generator power vehicle, the energy storage vehicle controller sends an off-grid signal to the low-voltage diesel generator power vehicle, and the low-voltage diesel generator power vehicle switches to off-grid operation; ③ The energy storage vehicle controller controls the energy storage converter to stop inverter capacity expansion and switch to charging the lithium battery; ④ Once the lithium battery is fully charged, the energy storage vehicle controller controls the energy storage converter to connect to the grid; ⑤ After the medium-voltage switching power supply is restored and the energy storage converter is connected to the grid, the power of the low-voltage diesel generator vehicle will be transferred to the energy storage vehicle. ⑥ The energy storage vehicle controller sends a shutdown signal to the low-voltage diesel generator power vehicle to shut down the low-voltage diesel generator power vehicle; ⑦ Close the medium-voltage switch, operate the energy storage vehicle controller to close the grid-connected switching cabinet to complete the grid connection with the mains power, and the energy storage converter becomes a voltage source; ⑧ Close the low-voltage sectional / boundary switch, operate the energy storage vehicle controller to disconnect and disconnect the grid-connected switching cabinet and control the energy storage converter to stop, and disconnect the mains input cable and load output cable while energized.

5. A method for grid-connected and off-grid coordinated operation control of the power supply systems of the energy storage vehicle, the medium-voltage diesel generator vehicle, and the low-voltage diesel generator vehicle according to claim 1, characterized in that, Includes the following steps: Step 1: Connect the mains input cable and the load output cable to the power supply side and load side of the low-voltage sectionalizing / separating switch respectively while they are energized; Step 2: Operate the energy storage vehicle controller to close the off-grid switching cabinet, forming a bypass power supply for the low-voltage sectional / boundary switch at the mains input terminal and the load output terminal, and open the low-voltage sectional / boundary switch; Step 3: Operate the energy storage vehicle controller to start the energy storage converter for grid connection, and charge the lithium battery if necessary; Step 4: In the event of a power outage due to a fault on the low-voltage segment / boundary switch power supply side, the energy storage vehicle controller will automatically disconnect and switch to the off-grid switching cabinet. The lithium battery will be inverted by the energy storage converter and supplied to the load side through the load output terminal. Step 5: Disconnect the medium-voltage switch. When the lithium battery of the energy storage vehicle is at low SOC, the energy storage vehicle controller sends a start signal to the medium-voltage diesel generator vehicle and the low-voltage diesel generator vehicle. Step Six: After the medium-voltage diesel generator power supply vehicle and the low-voltage diesel generator power supply vehicle are started, they are connected to the grid. The energy storage vehicle controller distributes the load power of the energy storage vehicle to the medium-voltage diesel generator power supply vehicle and the low-voltage diesel generator power supply vehicle according to the optimal fuel power value of the generator set. Step 7: The energy storage vehicle controller controls the energy storage converter to stop inverter capacity expansion and switch to charging the lithium battery; Step 8: After the lithium battery is fully charged, the energy storage vehicle controller controls the energy storage converter to connect to the grid. Step 9: After the medium-voltage switching power supply side is restored and the energy storage converter is connected to the grid, the power of the medium-voltage diesel generator power vehicle and the low-voltage diesel generator power vehicle is transferred to the energy storage vehicle. Step 10: The energy storage vehicle controller sends a shutdown signal to the medium-voltage diesel generator power supply vehicle and the low-voltage diesel generator power supply vehicle to shut down the medium-voltage diesel generator power supply vehicle and the low-voltage diesel generator power supply vehicle. Step 11: Close the medium-voltage switch, operate the energy storage vehicle controller to close the grid connection and disconnection switching cabinet, complete the grid connection with the mains power, and the energy storage converter becomes a voltage source; Step 12: Close the low-voltage sectional / boundary switch, disconnect the energy storage vehicle controller from the grid switching cabinet and control the energy storage converter to stop, and disconnect the mains input cable and load output cable while the power is on.

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