Multi-machine parallel grid-connected system of van and emergency power supply method thereof

Abstract

The application discloses a kind of multiple machine parallel machine grid-connected systems of compartmentalized vehicle and its emergency power supply method, including by N+1 10kV power car and a 10kV change 20kV compartmentalized vehicle, compartmentalized vehicle is equipped with transformer, 20kV switch cabinet, 10kV switch cabinet, vehicle power supply and distribution control cabinet.The application is by constructing multiple 10kV power car and 10kV change 20kV compartmentalized vehicle and is formed into parallel machine network, make up the blank in 20kV special operation vehicle field, and provide strong guarantee in response to increasing 20kV line;By adding transformer in 10kV change 20kV compartmentalized vehicle, and by setting 20kV switch cabinet and 10kV switch cabinet control 20kV control;Cooperate 10kV power car, realize 20kV line non-power supply by controller operation.

Description

Technical Field

[0001] The present invention relates to the field of special vehicles, and in particular to a multi-machine paralleling and grid-connecting system for a car-type transformer vehicle and an emergency power supply method thereof. Background Art

[0002] In the 1970s, China completed the process of standardizing its complex medium-voltage distribution network to 10kV. With China's rapid economic development and a surge in electricity demand, the 10kV distribution network gradually became incapable of meeting the requirements for safe, stable, and economical power consumption. Consequently, the 20kV voltage level began to replace the 10kV system, directly feeding 380V power, resulting in a 110 / 20 / 0.38kV or 220 / 20 / 0.38kV power supply system. Currently, the electric special operation vehicle industry lacks a 20kV power supply system. When a large area experiences a sudden power outage due to some reason and rapid repairs are not possible, prolonged power outages can result, leading to significant economic losses and reduced customer satisfaction. Although power supply vehicles are now widely used for emergency power restoration, they require the utility power to be shut down before the vehicle can begin supplying power, and the vehicle must be shut down again before the utility power is restored. Consequently, a single power restoration operation results in two power outages for each customer. And currently single-machine power supply is still the mainstream power supply method, but for large-area power supply, single-machine power supply often cannot meet the user load requirements.

[0003] The existing boxcar transformer is 0.4kV to 10kV, which cannot ensure uninterrupted power supply for 20kV lines, resulting in a lot of power outages. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-machine paralleling and grid-connected system for a box-type transformer and an emergency power supply method thereof, which can operate on a 20kV line without power outage, and provide a strong guarantee for the maintenance and repair of the 20kV line without power outage.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] A kind of multiple machine parallel grid-connected system of compartment van, by N+1 10kV power car and a 10kV variable 20kV compartment van, each 10kV power car is equipped with generator set and distribution cabinet, each generator set is equipped with IG-NT controller and IM-NT controller, and is equipped with control switch, the distribution cabinet of each 10kV power car is equipped with " grid-connected, off " knob, " first / tail machine " gear and " intermediate machine " gear, " grid-connected, off " knob, " first / tail machine " gear and " intermediate machine " gear are connected with the IG-NT controller and IM-NT controller of the generator set by control circuit;Each 10kV power car is also equipped with 10kV unit incoming line cabinet, 10kV outgoing line cabinet and 10kV mains incoming line cabinet, each incoming line cabinet or outgoing line cabinet is equipped with switch;

[0007] The compartment of the 10kV variable 20kV compartment van is equipped with transformer, 20kV switch cabinet, 10kV switch cabinet, vehicle power supply and distribution control cabinet, the inside of the distribution control cabinet is equipped with IM-NT controller, and the outside is equipped with " grid-connected, off " knob, " grid-connected, off " knob is connected with internal IM-NT controller by control circuit;The 10kV switch cabinet is equipped with 10kV compartment variable incoming line cabinet and 10kV transformer incoming line cabinet;The 20kV switch cabinet is equipped with 20kV transformer feeder cabinet, 20kV outgoing line cabinet and 20kV mains incoming line cabinet, each incoming line cabinet or outgoing line cabinet is equipped with switch;The 10kV compartment variable incoming line cabinet and 10kV transformer incoming line cabinet are connected with the transformer after being connected in series by cable, the 20kV outgoing line cabinet and 20kV mains incoming line cabinet are connected in series after being connected in parallel by cable, and then are connected with the transformer;

[0008] The 10kV outgoing line cabinet of the 10kV power car of No. 1 is equipped with 10kV compartment van incoming line flexible cable, which is connected into the 10kV compartment variable incoming line cabinet of the 10kV variable 20kV compartment van, and the 10kV outgoing line cabinet of each 10kV power car is also equipped with 10kV parallel machine flexible cable, which is connected into the 10kV outgoing line cabinet of the next 10kV power car;The 10kV mains incoming line cabinet of the 10kV power car of No. 1 is equipped with multiple machine grid-connected flexible cable, which is connected into the 10kV compartment van incoming line flexible cable line;The 10kV unit incoming line cabinet of the 10kV power car of No. 1 is equipped with communication cable, which is connected with the 20kV mains incoming line cabinet of the 10kV variable 20kV compartment van;

[0009] The 20kV mains incoming line cabinet is equipped with mains flexible cable, which is connected to the input end of external 20kV overhead line switch, and the 20kV outgoing line cabinet is equipped with load flexible cable, which is connected to the input end of external user load.

[0010] Preferably, the 10kV to 20kV van transformer vehicle includes a chassis and a vehicle compartment, the inside of the vehicle compartment is divided into an equipment room, a control room and a winch room from front to back, the transformer is arranged in the equipment room, the 20kV switch cabinet, the 10kV switch cabinet, the vehicle power supply and the power distribution control cabinet are arranged in the control room, the equipment room is further provided with a space heater, and a heat dissipation fan is arranged on the side wall; the winch room is provided with a cable winch and a winch control box; the lower side of the front part of the vehicle compartment is provided with a 20kV power input and output cabin, and the lower side of the rear part is provided with a hydraulic control system, a 10kV power input cabin and a vehicle mains input cabin.

[0011] A method for emergency power supply by using a multi-machine parallel grid system of a van transformer vehicle, characterized in that: including single-machine load operation, single-machine grid-connected load operation, parallel-machine grid-connected load operation and multi-machine grid-connected load operation;

[0012] The specific operation steps of the single-machine load operation are: confirming that the 20kV overhead line switch is in the open state, connecting the load flexible cable and the 10kV van transformer vehicle, closing the switch of the 10kV outgoing line cabinet of the 10kV power vehicle, closing the switches of the 10kV transformer incoming line cabinet and the 20kV outgoing line cabinet of the 10kV to 20kV van transformer vehicle, starting the generator set of the 10kV power vehicle, pressing the IG-NT controller closing button of the generator set, closing the 10kV machine set incoming line cabinet switch, and the generator set of the 10kV power vehicle can supply power to the user load;

[0013] The single-machine grid-connected load operation includes forward grid connection and reverse grid connection. The operation steps of the forward grid connection are as follows: firstly, connect the load flexible cable and the 10kV compartmental vehicle incoming line flexible cable, close the switch of the 10kV outgoing line cabinet of the 10kV power supply vehicle, close the 10kV transformer incoming line cabinet and 20kV outgoing line cabinet switches of the 10kV transformer of the 20kV compartmental vehicle, rotate the "grid connection and disconnection" knob of the distribution cabinet of the 10kV power supply vehicle to the "grid connection" position, start the generator set of the 10kV power supply vehicle, press the IG-NT controller closing button of the generator set, close the switch of the 10kV unit incoming line cabinet, the generator set is grid-connected, and the base load is adjusted to the power of the existing user load; after the 20kV overhead line is started for maintenance, disconnect the 20kV overhead line switch, the power grid is split, and the "grid connection and disconnection" knob of the distribution cabinet of the 10kV power supply vehicle is rotated to the "disconnection" position; the operation steps of the reverse grid connection are as follows: firstly, connect the power flexible cable, rotate the "grid connection and disconnection" knob of the distribution control cabinet of the 10kV transformer 20kV compartmental vehicle to the "grid connection" position, press the IM-NT controller closing button of the 10kV transformer 20kV compartmental vehicle, close the switch of the 20kV power incoming line cabinet, and the power is reverse grid-connected; the base load on the IM-NT controller of the 10kV transformer 20kV compartmental vehicle is adjusted to 0, and the power supplies the user load;

[0014] The specific operation of the parallel-machine load operation is as follows: confirm that the 20kV overhead line switch is in the disconnected state, connect the load flexible cable, 10kV compartmental vehicle incoming line flexible cable, 10kV parallel-machine flexible cable and communication cable, close the switch of the 10kV outgoing line cabinet of the 1st to N+1st 10kV power supply vehicles, close the 10kV transformer incoming line cabinet and 20kV outgoing line cabinet switches of the 10kV transformer 20kV compartmental vehicle, rotate the knobs of the distribution cabinets of the 1st to N+1st 10kV power supply vehicles to the "first / last machine" gear, select the "intermediate machine" gear of the distribution cabinet of the intermediate 10kV power supply vehicle, start the generator sets of the 1st to N+1st 10kV power supply vehicles in turn, press the IG-NT controller closing button of each 10kV power supply vehicle, close the switch of the 10kV unit incoming line cabinet, and the generator sets of the 10kV power supply vehicles can supply power to the user load;

[0015] The multi-machine grid-connected load operation includes forward grid connection and reverse grid connection, and the operation steps of the forward grid connection are as follows: the load flexible cable, 10kV compartmental transformer flexible cable, 10kV grid connection flexible cable, communication cable and multi-machine grid connection flexible cable are connected, the switches of the 10kV outlet cabinet of the No.1 to N+1 No.10kV power supply vehicles are closed, the switches of the 10kV transformer inlet cabinet and 20kV outlet cabinet of the 10kV to 20kV compartmental transformer are closed, the generator sets of the No.1 to N+1 No.10kV power supply vehicles are started in sequence, the IG-NT controller closing buttons of the 10kV power supply vehicles are pressed respectively, the switch of the 10kV unit inlet cabinet is closed, the "grid connection and disconnection" knob on the distribution cabinet of the No.1 10kV power supply vehicle is rotated to "grid connection", the IM-NT controller closing button of the No.1 10kV power supply vehicle is pressed, and the 10kV municipal power inlet cabinet switch is closed; the sum of the base loads of the No.1 to N+1 No.10kV power supply vehicles is adjusted to the existing load, the 20kV overhead line switch is pulled open, the municipal power grid is split, the "grid connection and disconnection" knob on the distribution cabinet of the No.1 10kV power supply vehicle is rotated to "disconnection"; the operation steps of the reverse grid connection are as follows: the municipal power flexible cable is connected, the "grid connection and disconnection" knob on the distribution control cabinet of the 10kV to 20kV compartmental transformer is rotated to "grid connection", the IM-NT controller is pressed, the 20kV municipal power inlet cabinet switch is closed, the reverse grid connection is completed, then the 20kV overhead line switch is closed, the municipal power grid is restored to supply power, the base load of the IM-NT controller of the 10kV to 20kV compartmental transformer is adjusted to 0, and the municipal power grid supplies power to the user load through the bypass of the 10kV to 20kV compartmental transformer.

[0016] Preferably, the release operation steps of the single-machine load operation are as follows: after the municipal power is restored to supply power, the IG-NT controller opening button of the generator set of the 10kV power supply vehicle is pressed, the 10kV unit inlet cabinet switch is opened, and the generator set stops working; then the 10kV transformer inlet cabinet and 20kV outlet cabinet switches of the 10kV to 20kV compartmental transformer, the 10kV outlet cabinet switch of the 10kV power supply vehicle and the 20kV overhead line switch are opened, and the load flexible cable and 10kV compartmental transformer inlet flexible cable are removed, and the power supply is completed.

[0017] Preferably, the operation steps for removing emergency power supply of the single-machine grid-connected load operation are: first, close the 20kV overhead line switch, press the 10kV power car IG-NT controller disconnecting button, disconnect the 10kV unit incoming line cabinet switch, and stop the 10kV generator set; disconnect the 20kV outgoing line cabinet and 20kV municipal power incoming line cabinet switches, remove the load flexible cable, 10kV compartment car incoming line flexible cable and municipal power flexible cable, and complete the removal of power supply.

[0018] Preferably, the operation steps for removing emergency power supply of the parallel-machine grid-connected load operation are: press the IG-NT controller disconnecting button of each 10kV power car, disconnect the 10kV unit incoming line cabinet switch, stop the generator set in turn, disconnect the 10kV transformer incoming line cabinet and 20kV outgoing line cabinet switches of the 10kV to 20kV compartment car, and the 10kV outgoing line cabinet switches of each 10kV power car, close the 20kV overhead line switch, and remove the load flexible cable, 10kV compartment car incoming line flexible cable, 10kV parallel-machine flexible cable and communication cable, and switch to municipal power supply to the user load.

[0019] Preferably, the operation steps for removing emergency power supply of the multi-machine grid-connected load operation are: press the IG-NT controller disconnecting button of the 1st to N+1th 10kV power cars in turn, disconnect the 10kV unit incoming line cabinet switch, stop the generator set of the 1st to N+1th 10kV power cars, restore the "grid-connected, disengaged" knob on the distribution control cabinet of the 10kV to 20kV compartment car to the "disengaged" position, and disconnect the 10kV municipal power incoming line cabinet switch of the 1st 10kV power car and the 20kV municipal power incoming line cabinet switch of the 10kV to 20kV compartment car; remove the municipal power flexible cable, load flexible cable, 10kV compartment car incoming line flexible cable, 10kV parallel-machine flexible cable, communication cable and multi-machine grid-connected flexible cable, and restore to municipal power supply to the user load.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1. The present application constructs a multi-machine grid-connected network composed of multiple 10kV power cars and 10kV to 20kV compartment cars, fills the gap in the field of 20kV special operation vehicles, and provides strong support for increasing 20kV lines;

[0022] 2. By adding a transformer in the 10kV to 20kV compartment car and controlling 20kV through the 20kV switch cabinet and 10kV switch cabinet, and cooperating with the 10kV power car, the controller is operated to realize uninterrupted power supply of 20kV lines.

[0023] 3、The grid-connected operation of the present application is simple, safe and efficient, and meets the requirements of emergency power supply. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a top view of the inside of the 10kV-to-20kV compartmentalized vehicle of the present application.

[0025] Figure 2 is a left view of the 10kV-to-20kV compartmentalized vehicle.

[0026] Figure 3 is a right view of the 10kV-to-20kV compartmentalized vehicle.

[0027] Figure 4 is a schematic diagram of the line connection of the grid-connected system.

[0028] Figure 5 is a schematic diagram of the line connection of the No. 1 10kV power supply vehicle.

[0029] Figure 6 is a schematic diagram of the line connection of the No. 2 to No. N 10kV power supply vehicles.

[0030] Figure 7 is a schematic diagram of the line connection of the No. N+1 10kV power supply vehicle.

[0031] Figure 8 is a schematic diagram of the line connection of the 10kV-to-20kV compartmentalized vehicle.

[0032] In the figure, 1 is a chassis, 2 is a vehicle compartment, 3 is a space heater, 4 is a transformer, 5 is a heat dissipation fan, 6 is a 20kV switch cabinet, 7 is a 10kV switch cabinet, 8 is a vehicle power supply, 9 is a power distribution control cabinet, 10 is a transformer temperature controller, 11 is a cable winch, 12 is a winch control box, 13 is a 20kV power supply input / output cabin, 14 is a hydraulic control system, 15 is a 10kV power supply input cabin, 16 is a vehicle mains input cabin;

[0033] 17 is a 10kV unit incoming line cabinet, 18 is a 10kV outgoing line cabinet, 19 is a 10kV mains incoming line cabinet, 20 is a 10kV compartmentalized vehicle incoming line cabinet, 21 is a 10kV transformer incoming line cabinet, 22 is a 20kV transformer feeder line cabinet, 23 is a 20kV outgoing line cabinet, 24 is a 20kV mains incoming line cabinet, 25 is a 10kV compartmentalized vehicle incoming flexible cable, 26 is a 10kV parallel machine flexible cable, 27 is a multi-machine grid-connected flexible cable, 28 is a communication cable, 29 is a 20kV overhead line switch, 30 is a user load, 31 is a mains flexible cable, and 32 is a load flexible cable. DETAILED DESCRIPTION

[0034] The application will be described in detail below with reference to the drawings and specific embodiments, but the embodiments of the application are not limited thereto.

[0035] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first" and "second" are for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0036] Figures 1-8 It is a preferred scheme of the application, and the 10kV to 20kV compartmentalized vehicle of the application comprises a chassis 1 and a vehicle compartment 2, the inside of the vehicle compartment 2 is divided into an equipment room, a control room and a winch room from front to back, a space heater 3 and a transformer 4 are arranged in the equipment room, a heat dissipation fan 5 is arranged on the side wall, the space heater 3 is mainly used for dry weather or humid weather to make the vehicle environment dry; the transformer 4 can change the 10kv voltage into 20kv voltage; a 20kV switch cabinet 6, a 10kV switch cabinet 7, a vehicle power supply 8, a power distribution control cabinet 9 and a transformer temperature controller 10 are arranged in the control room; the vehicle power supply 8 provides power supply for the equipment in the compartmentalized vehicle, the equipment in the vehicle includes vehicle lighting, the power distribution control cabinet 9, the 20kV switch cabinet 6, the 10kV switch cabinet 7, the space heater 3, a cable winch 11 and the like; an IM-NT controller is arranged in the power distribution control cabinet 9, and a "grid-connected, off-grid" knob (not shown in the figure) is arranged outside, the "grid-connected, off-grid" knob is connected with the internal IM-NT controller through a control circuit; the cable winch 11 and a winch control box 12 are arranged in the winch room, the cable winch 11 is powered by alternating current and is used for winding the cable used by the compartmentalized vehicle; the winch control box 12 controls the winding and unwinding of the cable winch 11 and can adjust the winding and unwinding speed according to the need; a 20kV power input and output cabin 13 is arranged at the lower side of the front part of the vehicle compartment 2, a hydraulic control system 14, a 10kV power input cabin 15 and a vehicle mains input cabin 16 are arranged at the lower side of the rear part of the vehicle compartment 2. The 20kV power input and output cabin 13 is an external 20kV power input interface and an external 20kV power output interface of the 20kV power supplied by the transformer; the hydraulic control system 14 is a control system of the hydraulic outrigger of the compartmentalized vehicle, which controls the lifting of the outrigger, and the four outriggers can be lifted simultaneously or a single outrigger can be controlled individually; the 10kV power input cabin 15 is an input interface for connecting the 10kV power supply vehicle through the 10kV cable when grid-connected; the vehicle mains input cabin 16 connects the external 220V mains input to provide power supply for the maintenance and repair of the compartmentalized vehicle.

[0037] The compartmentalized vehicle is connected to the 10kV power supply input cabin 15 from the 10kV power supply vehicle or the 10kV overhead line, the vehicle power supply 8 is started and the circuit breaker of the vehicle power supply 8 is closed, or the commercial power is connected to the vehicle commercial power input cabin 16, then the corresponding power switch in the power distribution control cabinet 9 is closed, then the switch in the 10kV switch cabinet 7 is closed, then the switch in the 20kV switch cabinet 6 is closed, finally the load cable is connected to the 20kV power supply input and output cabin 13, and the load can be powered.

[0038] The multi-machine parallel connection grid-connected system of the application is composed of N+1 10kV power supply vehicles and a 10kV-to-20kV compartmentalized vehicle, the 10kV power supply vehicles are numbered as No. 1, No. 2, …, No. N+1, N is an integer greater than or equal to 0; each 10kV power supply vehicle is provided with a generator set and a power distribution cabinet (not shown in the figure), each generator set is provided with an IG-NT controller and an IM-NT controller, and is provided with a control switch, the power distribution cabinet of each 10kV power supply vehicle is provided with a “grid connection and disconnection” knob, a “first / last machine” gear and an “intermediate machine” gear, the “grid connection and disconnection” knob, the “first / last machine” gear and the “intermediate machine” gear are connected to the IG-NT controller and the IM-NT controller of the generator set through a control circuit. Each 10kV power supply vehicle is further provided with a 10kV unit incoming line cabinet 17, a 10kV outgoing line cabinet 18 and a 10kV commercial power incoming line cabinet 19, and each incoming line cabinet or outgoing line cabinet is provided with a switch. The 10kV switch cabinet 7 of the 10kV-to-20kV compartmentalized vehicle is provided with a 10kV compartmentalized incoming line cabinet 20 and a 10kV transformer incoming line cabinet 21; the 20kV switch cabinet 6 of the 10kV-to-20kV compartmentalized vehicle is provided with a 20kV transformer feeder cabinet 22, a 20kV outgoing line cabinet 23 and a 20kV commercial power incoming line cabinet 24, and each incoming line cabinet or outgoing line cabinet is provided with a switch. The 10kV compartmentalized incoming line cabinet 20 and the 10kV transformer incoming line cabinet 21 are connected to the transformer 4 in series through a cable, and the 20kV outgoing line cabinet 23 and the 20kV commercial power incoming line cabinet 24 are connected to the 20kV transformer feeder cabinet 22 in series through a cable and then connected to the transformer 4.

[0039] The 10kV outgoing line cabinet 18 of the No. 1 10kV power supply vehicle is provided with a 10kV compartmentalized vehicle incoming line flexible cable 25 connected to the 10kV compartmentalized incoming line cabinet 20 of the 10kV-to-20kV compartmentalized vehicle, and the 10kV outgoing line cabinet 18 of each 10kV power supply vehicle is further provided with a 10kV parallel connection flexible cable 26 connected to the 10kV outgoing line cabinet 18 of the next 10kV power supply vehicle. The 10kV commercial power incoming line cabinet 19 of the No. 1 10kV power supply vehicle is provided with a multi-machine grid connection flexible cable 27 connected to the 10kV compartmentalized vehicle incoming line flexible cable 25. The 10kV unit incoming line cabinet 17 of the No. 1 10kV power supply vehicle is provided with a communication cable 28 connected to the 20kV commercial power incoming line cabinet 24 of the 20kV switch cabinet 6 of the compartmentalized vehicle.

[0040] The external overhead line is provided with a 20kV overhead line switch 29 connected with an external user load 30 to supply power to the user load 30, the 10kV-to-20kV compartment transformer of the grid-connected system of the application is provided with a power supply flexible cable 31 connected with the input end of the 20kV overhead line switch 29, and the 20kV outgoing line cabinet 23 is provided with a load flexible cable 32 connected with the input end of the user load 30.

[0041] The emergency power supply method of the multi-machine grid-connected system of the application includes four emergency power supply conditions of single-machine load operation, single-machine grid-connected load operation, grid-connected load operation and multi-machine grid-connected load operation, and the specific operation is as follows:

[0042] 1. Single-machine load operation

[0043] When the 20kV overhead line fails and the power supply cannot directly supply power to the user load 30, if emergency power supply is needed for a small power load, the single-machine load operation mode is adopted, that is, one 10kV power supply vehicle and one 10kV-to-20kV compartment transformer are combined to form a grid-connected system for emergency power supply, and the specific operation is as follows:

[0044] When the 20kV overhead line fails and the power supply cannot directly supply power to the user load 30, if emergency power supply is needed for a small power load, the single-machine load operation mode is adopted, that is, one 10kV power supply vehicle and one 10kV-to-20kV compartment transformer are combined to form a grid-connected system for emergency power supply, and the specific operation is as follows:

[0045] After the overhead line fault is eliminated and the power supply is restored, the emergency power supply of the system can be removed, and the specific operation is as follows: the IG-NT controller of the 10kV power supply vehicle is pressed to open the 10kV unit incoming line cabinet 17 switch, the generator set stops working; then the 10kV transformer incoming line cabinet 21 and the 20kV outgoing line cabinet 23 of the 10kV-to-20kV compartment transformer are opened, the 10kV outgoing line cabinet 18 of the 10kV power supply vehicle is opened, the 20kV overhead line switch 29 is closed, and the load flexible cable 32 and the 10kV compartment transformer incoming line flexible cable 25 are removed, and the power supply is completed.

[0046] 2. Single-machine grid-connected load operation

[0047] When the city power plans to maintain the 20kV overhead line, in order to ensure the user load 30 to be powered on during the maintenance, the on-line grid-connected system needs to be connected to the power supply line in advance. If the on-line connection of the low-power load is needed, the single-machine grid-connected operation mode is adopted, that is, one 10kV power supply vehicle and one 10kV-to-20kV van transformer form the grid-connected system to perform the on-line grid-connected operation. The specific operation is as follows:

[0048] Forward grid connection (that is, when the city power is not powered off, the 10kV power supply vehicle is connected to the city power through the 10kV-to-20kV van transformer) : connect the load flexible cable 32 and the 10kV van transformer flexible cable 25, open the 10kV outlet cabinet 18 switch of the 10kV power supply vehicle, close the 10kV transformer inlet cabinet 21 and the 20kV outlet cabinet 23 switches of the 10kV-to-20kV van transformer, rotate the "grid connection, disconnection" knob of the power distribution cabinet of the 10kV power supply vehicle to the "grid connection" position, start the generator set of the 10kV power supply vehicle, press the IG-NT controller on-off button of the generator set, close the 10kV unit inlet cabinet 17 switch, and the generator set is connected to the grid. Adjust the base load to the power of the existing user load 30. After the 20kV overhead line starts to be maintained, the 20kV overhead line switch 29 is opened, the city power grid is split, and the 10kV power supply vehicle starts to supply power to the user load 30 on the 20kV line. After the city power grid is split, rotate the "grid connection, disconnection" knob of the power distribution cabinet of the 10kV power supply vehicle to the "disconnection" position. Figure 4 Reverse grid connection (that is, after the city power maintenance is completed, the city power is connected to the unit) : connect the city power flexible cable 31, open the 10kV outlet cabinet 18 switch of the 10kV power supply vehicle, close the 10kV-to-20kV van transformer flexible cable 25, rotate the "grid connection, disconnection" knob of the power distribution control cabinet 9 of the 10kV-to-20kV van transformer to the "grid connection" position, press the IM-NT controller on-off button of the 10kV-to-20kV van transformer, and close the switch of the 20kV city power inlet cabinet 24. The city power is completed reverse grid connection; adjust the base load on the IM-NT controller of the 10kV-to-20kV van transformer to 0, and the city power supplies power to the user load 30.

[0049] Figure 4 When the emergency power supply is removed, first close the 20kV overhead line switch 29, press the IG-NT controller on-off button of the generator set of the 10kV power supply vehicle, and open the 10kV unit inlet cabinet 17 switch. The generator set of the 10kV power supply vehicle stops working; open the 20kV outlet cabinet 23 and the 20kV city power inlet cabinet 24 switches, remove the load flexible cable 32, the 10kV van transformer flexible cable 25 and the city power flexible cable 31, and complete the power supply removal.

[0050] 3. Parallel machine with load operation

[0051] 3. Parallel machine with load operation

[0052] ​When the overhead line of 20kV fails and the power supply cannot directly supply power to the user load 30, if the emergency power supply is needed for the high-power load, the parallel operation mode is used, that is, (N+1) 10kV power supply vehicles plus 1 10kV-20kV van transformer vehicle form a parallel grid system for emergency power supply, and the specific operation is as follows:

[0053] Confirm that the 20kV overhead line switch 29 is in the off state, and connect the load flexible cable 32, 10kV van transformer flexible cable 25 and 10kV parallel flexible cable 26, communication cable 28 in Figure 4 good condition, close the switch of 10kV outlet cabinet 18 of No.1- (N+1) 10kV power supply vehicle, close the switch of 10kV transformer inlet cabinet 21 and 20kV outlet cabinet 23 of 10kV-20kV van transformer vehicle, rotate the knob of the distribution cabinet of the generator set of No.1- (N+1) 10kV power supply vehicle to "first / last machine" gear, select "middle machine" gear for the distribution cabinet of the middle generator set, start the generator set of No.1- (N+1) 10kV power supply vehicle in turn, press the closing button of IG-NT controller of each 10kV power supply vehicle, close the switch of 10kV unit inlet cabinet 17, and complete the parallel operation of the generator set of all 10kV power supply vehicles to supply power to the user load 30.

[0054] When the overhead line fault is eliminated, press the opening button of IG-NT controller of each 10kV power supply vehicle, open the switch of 10kV unit inlet cabinet 17, then stop the generator set in turn, disconnect the switch of 10kV transformer inlet cabinet 21 and 20kV outlet cabinet 23 of 10kV-20kV van transformer vehicle, and the switch of 10kV outlet cabinet 18 of each 10kV power supply vehicle, close the 20kV overhead line switch 29, and remove the load flexible cable 32, 10kV van transformer flexible cable 25, 10kV parallel flexible cable 26 and communication cable 28, and convert to the power supply to the user load 30.

[0055] 4、Multi-machine parallel grid operation with load

[0056] When the power supply plans to overhaul the overhead line of 20kV, in order to ensure that the user load 30 is continuously powered during the overhaul, the parallel grid system needs to be connected online to the power supply line in advance, if the online connection of high-power load is needed, the multi-machine parallel grid operation with load is used, that is, (N+1) 10kV power supply vehicles plus 1 10kV-20kV van transformer vehicle form a parallel grid system for online parallel grid operation, and the specific operation is as follows:

[0057] Forward parallel operation (i.e. when the city power is not off, the multiple 10kV power cars are connected to the city power through the 10kV to 20kV compartment transformer car): connect the load flexible cable 32, 10kV compartment transformer car incoming line flexible cable 25, 10kV parallel operation flexible cable 26, communication cable 28 and multi-machine parallel operation flexible cable 27 to the 10kV to 20kV compartment transformer car, and connect the 10kV to 20kV compartment transformer car to the city power through the 10kV to 20kV compartment transformer car, and connect the 10kV to 20kV compartment transformer car to the city power through the 10kV to 20kV compartment transformer car. Figure 4 Close the switches of the 10kV outgoing line cabinet 18 of the No.1 10kV power car to the No.N+1 10kV power car, the 10kV transformer incoming line cabinet 21 and the 20kV outgoing line cabinet 23 of the 10kV to 20kV compartment transformer car, start the generator sets of the No.1 10kV power car to the No.N+1 10kV power car in turn, and press the closing buttons of the IG-NT controllers of the 10kV power cars respectively, close the switch of the 10kV unit incoming line cabinet 17, complete the parallel operation of the generator sets, rotate the "parallel operation, disconnection" knob on the distribution cabinet of the No.1 10kV power car to "parallel operation", press the closing button of the IM-NT controller of the No.1 10kV power car, close the switch of the 10kV city power incoming line cabinet 19, and the 10kV power car is connected to the city power in forward direction. Adjust the base load of the power car to the existing load, open the 20kV overhead line switch 29, and the city power grid is disconnected. The 10kV power car completes the parallel operation and supplies power to the user load 30 on the 20kV overhead line. After the city power grid is disconnected, rotate the "parallel operation, disconnection" knob on the distribution cabinet of the No.1 10kV power car to "disconnection".

[0058] Reverse parallel operation (i.e. after the city power is repaired, the city power is connected to the multiple 10kV power cars and the 10kV to 20kV compartment transformer car): after the city power is restored, connect the city power flexible cable 31 to the 10kV to 20kV compartment transformer car, and connect the 10kV to 20kV compartment transformer car to the city power through the 10kV to 20kV compartment transformer car. Figure 4 Close the switches of the 10kV outgoing line cabinet 18 of the No.1 10kV power car to the No.N+1 10kV power car, the 10kV transformer incoming line cabinet 21 and the 20kV outgoing line cabinet 23 of the 10kV to 20kV compartment transformer car, start the generator sets of the No.1 10kV power car to the No.N+1 10kV power car in turn, and press the closing buttons of the IG-NT controllers of the 10kV power cars respectively, close the switch of the 10kV unit incoming line cabinet 17, complete the parallel operation of the generator sets, rotate the "parallel operation, disconnection" knob on the distribution cabinet of the No.1 10kV power car to "parallel operation", press the closing button of the IM-NT controller of the No.1 10kV power car, close the switch of the 10kV city power incoming line cabinet 19, and the 10kV power car is connected to the city power in forward direction. Adjust the base load of the power car to the existing load, open the 20kV overhead line switch 29, and the city power grid is disconnected. The 10kV power car completes the parallel operation and supplies power to the user load 30 on the 20kV overhead line. After the city power grid is disconnected, rotate the "parallel operation, disconnection" knob on the distribution cabinet of the No.1 10kV power car to "disconnection".

[0059] Press the opening buttons of the IG-NT controllers of the No.1 10kV power car to the No.N+1 10kV power car in turn, open the switch of the 10kV unit incoming line cabinet 17, and stop the generator sets. Restore the "parallel operation, disconnection" knob on the distribution cabinet of the 10kV to 20kV compartment transformer car to the "disconnection" position, and open the switches of the 10kV city power incoming line cabinet 19 of the No.1 10kV power car and the 20kV city power incoming line cabinet 24 of the 10kV to 20kV compartment transformer car. Remove the city power flexible cable 31, the load flexible cable 32, the 10kV compartment transformer car incoming line flexible cable 25, the 10kV parallel operation flexible cable 26, the communication cable 28 and the multi-machine parallel operation flexible cable 27, and restore the city power to directly supply power to the user load 30.

[0060] The above description is only the preferred embodiment of the present application, and is not intended to limit the technical scope of the present application. Any slight modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment still belongs to the protection scope of the present application.

Claims

1. A multi-machine parallel and grid-connected system for a car-type transformer, characterized by: : It consists of N+1 10kV power supply vehicles and one 10kV to 20kV transformer vehicle, each of the 10kV power supply vehicles is equipped with a generator set and a distribution cabinet, each of the generator sets is equipped with an IG-NT controller and an IM-NT controller, and is equipped with a control switch. The distribution cabinet of each 10kV power supply vehicle is equipped with a "grid connection / disconnection" knob, a "first / last generator" gear position, and an "intermediate generator" gear position. The "grid connection / disconnection" knob, the "first / last generator" gear position, and the "intermediate generator" gear position are all connected to the IG-NT controller and the IM-NT controller of the generator set via control lines; each of the 10kV power supply vehicles is also equipped with a 10kV unit incoming line cabinet, a 10kV outgoing line cabinet, and a 10kV mains incoming line cabinet, and each incoming line cabinet or outgoing line cabinet is equipped with a switch; The 10kV to 20kV car-to-car transformer car is equipped with a transformer, a 20kV switch cabinet, a 10kV switch cabinet, a vehicle power supply and a distribution control cabinet. The distribution control cabinet is equipped with an IM-NT controller inside and a "grid connection / disconnection" knob outside. The "grid connection / disconnection" knob is connected to the internal IM-NT controller through a control line; the 10kV switch cabinet is equipped with a 10kV car-to-car transformer incoming cabinet and a 10kV transformer incoming cabinet; the 20kV switch cabinet is equipped with a 20kV transformer feeder cabinet, a 20kV outgoing cabinet and a 20kV mains incoming cabinet, and each incoming cabinet or outgoing cabinet is equipped with a switch; the 10kV car-to-car transformer incoming cabinet and the 10kV transformer incoming cabinet are connected in series with a cable, and the 20kV outgoing cabinet and the 20kV mains incoming cabinet are connected in parallel with a cable and then connected in series with the 20kV transformer feeder cabinet and then connected to the transformer; The 10kV outlet cabinet of the 10kV power supply car No. 1 is provided with a 10kV compartment transformer car incoming line flexible cable connected to the 10kV compartment transformer incoming line cabinet of the 10kV to 20kV compartment transformer car. The 10kV outlet cabinet of each 10kV power supply car is also provided with a 10kV parallel machine flexible cable connected to the 10kV outlet cabinet of the next 10kV power supply car; the 10kV mains incoming line cabinet of the 10kV power supply car No. 1 is provided with a multi-machine grid-connected flexible cable connected to the 10kV compartment transformer car incoming line flexible cable line; the 10kV unit incoming line cabinet of the 10kV power supply car No. 1 is provided with a communication cable connected to the 20kV mains incoming line cabinet of the 10kV to 20kV compartment transformer car; The 20kV mains incoming line cabinet is provided with an input end for connecting a mains flexible cable to an external 20kV overhead line switch, and the 20kV outgoing line cabinet is provided with an input end for connecting a load flexible cable to an external user load.

2. The multi-machine parallel and grid-connected system for a car-type transformer according to claim 1 is characterized by: The 10kV to 20kV car transformer includes a chassis and a car. The interior of the car is divided into an equipment room, a control room and a winch room from front to back. The transformer is arranged in the equipment room, and the 20kV switchgear, 10kV switchgear, vehicle power supply and distribution control cabinet are arranged in the control room. The equipment room is also provided with a space heater, and a cooling fan is provided on the side wall; the winch room is provided with a cable winch and a winch control box; the front lower side of the car is provided with a 20kV power input and output cabin, and the rear lower side is provided with a hydraulic control system, a 10kV power input cabin and a vehicle mains input cabin.

3. An emergency power supply method for a multi-machine parallel and grid-connected system using the vehicle-transformer system of claim 2, characterized by: It includes four emergency power supply operation conditions: single machine load operation, single machine grid-connected load operation, parallel machine load operation and multi-machine grid-connected load operation; The specific operation steps of the single-machine load operation are as follows: confirm that the 20kV overhead line switch is in the disconnected state, connect the load flexible cable and the incoming flexible cable of the 10kV compartment transformer, then close the switch of the 10kV outgoing cabinet of the 10kV power supply vehicle, and at the same time close the switches of the 10kV transformer incoming cabinet and the 20kV outgoing cabinet of the 10kV to 20kV compartment transformer, start the generator set of the 10kV power supply vehicle, press the closing button of the generator set IG-NT controller, close the switch of the 10kV unit incoming cabinet, and the generator set of the 10kV power supply vehicle can supply power to the user load; The single-machine grid-connected operation with load includes forward grid-connection and reverse grid-connection. The operation steps of the forward grid-connection are: first, connect the load flexible cable and the 10kV compartment transformer car incoming line flexible cable, close the switch of the 10kV outgoing line cabinet of the 10kV power supply car, and at the same time close the switches of the 10kV transformer incoming line cabinet and 20kV outgoing line cabinet of the 10kV to 20kV compartment transformer car, then rotate the "grid connection, disconnection" knob of the distribution cabinet of the 10kV power supply car to "grid connection", start the generator set of the 10kV power supply car, press the closing button of the IG-NT controller of the generator set, close the switch of the 10kV unit incoming line cabinet, connect the generator set to the grid, and adjust the base load to the existing user load power amount; after the 20kV overhead line begins maintenance, disconnect the 20kV overhead line switch, decouple the mains power grid, and rotate the "grid connection, disconnection" knob of the distribution cabinet of the 10kV power supply car to the "disconnection" position; the reverse grid connection operation steps are: first connect the mains flexible cable, rotate the "grid connection, disconnection" knob of the distribution control cabinet of the 10kV to 20kV car to the "grid connection" position, press the closing button of the IM-NT controller of the 10kV to 20kV car, close the switch of the 20kV mains incoming line cabinet, and the mains power is reversely connected to the grid; adjust the base load on the IM-NT controller of the 10kV to 20kV car to 0, and the mains power supplies the user load; The specific operation of the parallel operation with load is as follows: confirm that the 20kV overhead line switch is in the disconnected state, connect the load flexible cable, the 10kV compartment transformer car incoming line flexible cable and the 10kV parallel flexible cable and the communication cable, close the switch of the 10kV outgoing line cabinet from the No. 1 10kV power supply car to the N+1 10kV power supply car, close the 10kV transformer incoming line cabinet and the 20kV outgoing line cabinet switch of the 10kV to 20kV compartment transformer car, and connect the No. 1 10kV power supply car to The knob of the distribution cabinet of the No. N+1 10kV power supply vehicle is rotated to the "first / last unit" position, and the knob of the distribution cabinet of the middle 10kV power supply vehicle is selected to the "middle unit" position. The generator sets of the No. 1 10kV power supply vehicle to the No. N+1 10kV power supply vehicle are started in sequence, and the closing button of the IG-NT controller of each 10kV power supply vehicle is pressed respectively to close the switch of the 10kV unit incoming line cabinet. The generator sets of the 10kV power supply vehicles can then supply power to the user loads; The multi-machine grid-connected load operation includes forward grid-connected and reverse grid-connected. The operation steps of the forward grid-connected operation are: connect the load flexible cable, 10kV compartment transformer incoming line flexible cable, 10kV parallel flexible cable, communication cable and multi-machine grid-connected flexible cable, close the switch of the 10kV outgoing line cabinet from the No. 1 10KV power supply car to the N+1 10kV power supply car, close the switch of the 10kV transformer incoming line cabinet and the 20kV outgoing line cabinet of the 10kV to 20kV compartment transformer car, start the generator sets from the No. 1 10KV power supply car to the N+1 10kV power supply car in sequence, press the closing button of the IG-NT controller of each 10kV power supply car respectively, close the switch of the 10kV unit incoming line cabinet, turn the "grid connection, disconnection" knob on the distribution cabinet of the No. 1 10KV power supply car to "grid connection", and press the closing button of the IM-NT controller of the No. 1 10KV power supply car. Close the 10kV mains incoming line cabinet switch; adjust the sum of the base loads from the No. 1 10kV power supply car to the N+1 10kV power supply car to the existing load, open the 20kV overhead line switch, decouple the mains power grid, and turn the "grid connection, disconnection" knob on the distribution cabinet of the No. 1 10kV power supply car to "disconnection"; the reverse grid connection operation steps are: connect the mains flexible cable, turn the "grid connection, disconnection" knob on the distribution control cabinet of the 10kV to 20kV car transformer to "grid connection", press the IM-NT controller, close the switch of the 20kV mains incoming line cabinet to complete the reverse grid connection, then close the 20kV overhead line switch, restore the mains power grid, adjust the base load of the IM-NT controller of the 10kV to 20kV car transformer to 0, and the mains power grid supplies power to the user load through the bypass of the 10kV to 20kV car transformer.

4. The emergency power supply method for a multi-machine parallel and grid-connected system of a car-transformer vehicle according to claim 3 is characterized by: The release operation steps for the single-machine load operation are as follows: after the mains power is restored, press the IG-NT controller disconnect button of the generator set of the 10kV power supply vehicle to disconnect the 10kV unit incoming cabinet switch, and the generator set stops working; then disconnect the 10kV transformer incoming cabinet and 20kV outgoing cabinet switches of the 10kV to 20kV compartment transformer vehicle, disconnect the 10kV outgoing cabinet switch of the 10kV power supply vehicle, close the 20kV overhead line switch, and remove the load flexible cable and the 10kV compartment transformer vehicle incoming flexible cable to complete the power release.

5. The emergency power supply method for a multi-machine parallel and grid-connected system of a car-transformer vehicle according to claim 3 is characterized by: The operating steps for releasing the emergency power supply for the single-machine grid-connected operation with load are as follows: first close the 20kV overhead line switch, press the disconnect button of the IG-NT controller of the generator set on the 10kV power supply vehicle, disconnect the switch of the 10kV unit incoming cabinet, and stop the generator set on the 10kV power supply vehicle; disconnect the switches of the 20kV outgoing cabinet and the 20kV mains incoming cabinet, remove the load flexible cable, the 10kV compartment transformer incoming flexible cable and the mains flexible cable, and complete the power supply release.

6. The emergency power supply method for a multi-machine parallel and grid-connected system of a car-transformer vehicle according to claim 3 is characterized by: The operating steps for releasing the emergency power supply for the parallel operation with load are as follows: press the IG-NT controller disconnect button of each 10kV power supply vehicle to disconnect the switch of the 10kV unit incoming cabinet, stop the generator sets in turn, and then disconnect the 10kV transformer incoming cabinet and 20kV outgoing cabinet switches of the 10kV to 20kV compartment transformer vehicle, as well as the 10kV outgoing cabinet switches of each 10kV power supply vehicle, close the 20kV overhead line switch, and remove the load flexible cable, 10kV compartment transformer vehicle incoming flexible cable, 10kV parallel flexible cable and communication cable, and switch to mains power to supply power to the user load.

7. The emergency power supply method for a multi-machine parallel and grid-connected system of a car-transformer vehicle according to claim 3 is characterized by: The operating steps for releasing the emergency power supply for the multi-machine grid-connected operation with load are as follows: press the disconnect buttons of the IG-NT controller from the No. 1 10kV power supply car to the No. N+1 10kV power supply car in sequence, disconnect the switch of the 10kV unit incoming cabinet, stop the generator set from the No. 1 10kV power supply car to the No. N+1 10kV power supply car, restore the "grid connection, disconnection" knob on the distribution control cabinet of the 10kV to 20kV compartment transformer car to the "disconnection" position, and disconnect the 10kV mains incoming cabinet switch of the No. 1 10KV power supply car and the 20kV mains incoming cabinet switch of the 10kV to 20kV compartment transformer car; remove the mains flexible cable, load flexible cable, 10kV compartment transformer car incoming flexible cable, 10kV parallel flexible cable, communication cable and multi-machine grid-connected flexible cable, and restore the mains power to directly supply power to the user load.

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