Mobile power generation equipment suitable for commercial power synchronous switching during multi-branch commercial power maintenance

Abstract

The invention provides mobile power generation equipment suitable for commercial power synchronous switching during multi-branch commercial power maintenance, which comprises a box body, a generator is arranged in the box body, an integrated control box is arranged on the box body, and a synchronous control module, a generator synchronous contactor, a generator main circuit breaker, a commercial power synchronous contactor and a current transformer are arranged in the integrated control box; the synchronous control module is connected with the generator, the generator synchronous contactor is connected with the synchronous control module through a closing and feedback signal line, and the generator main circuit breaker is connected with the diesel generator synchronous contactor; and a power supply regulation and control unit is arranged at the front end of the busbar load terminal. The mobile power generation equipment is internally provided with the synchronous control module, the commercial power synchronous contactor, the current transformer and other modules, a synchronous switching system can be conveniently constructed with commercial power, synchronous switching of commercial power supply and generator power supply can be achieved when a commercial power line is overhauled, and field operation is convenient and fast; the voltage output by the diesel generator and the voltage received by the user load end are always kept in a forward phase sequence, so that the working safety of the mobile power generation equipment is ensured.

Description

Technical Field

[0001] The invention relates to the field of diesel generator equipment, and in particular to a mobile generator equipment which is suitable for realizing synchronous switching of mains electricity during maintenance of multi-branch mains electricity. Background Art

[0002] Mobile power generation equipment (such as mobile diesel generators) can be widely used in construction sites, large gatherings, disaster relief sites, mines, night activity venues and other places that need to provide temporary power supply at night. It can meet the needs of large-scale and rapid urban construction, the needs of enriching people's cultural life, the needs of mineral exploration and development, and other industrial construction and social life needs. It can also be used as a backup power supply for city power maintenance. Mobile diesel generators can be installed on the frame like a container, or wheels can be installed under the chassis of the mobile diesel generator and moved to the maintenance construction site by a trailer. When the city power grid in a certain area needs to be repaired, the mobile diesel generator can be conveniently connected to the city power supply network as a backup power supply to supply power, avoiding the city power grid maintenance. The user's power consumption in the area is greatly affected. When the traditional power generation vehicle is connected to the city grid, it is necessary to add additional controllers, city power synchronous contactors, current transformers, and other electrical components or modules required for grid connection. In addition, the connection between the external cable and the mobile generator is also complicated, which makes the operation complicated during on-site construction and has certain safety risks.

[0003] In addition, during the current city power grid maintenance, even if the backup power supply is used, the usual practice is to first cut off the city power supply, then connect the backup power supply, and then start the backup power supply to generate electricity; after the city power grid maintenance is completed, first cut off the backup power supply, then connect the backup power supply, and then start the city power supply. In other words, users need to go through the process of power outage and power supply twice, and the impact on users still exists, such as power outage of working electrical appliances causing work interruption, loss of files in the computer, etc.

[0004] Therefore, the applicant has developed a mobile diesel generator that can realize the synchronous switching of the mains power and the backup power source such as a mobile diesel generator during the maintenance of the mains power grid (patent application number: CN202411366124.1). It can easily complete the functions of frequency comparison, synchronous closing, automatic adjustment of power generation output, etc. between the mobile generator and the mains, and will not affect the user's electricity consumption during the maintenance of the mains power; and it makes the on-site construction easier. This mobile generator is suitable for the maintenance of the mains power grid of a single branch, as long as a simple phase sequence detection device is used to ensure that the phase sequence of the three-phase voltage of the mains power grid of a single branch is consistent with the phase sequence of the output end of the diesel generator when the cable is connected. When there are multiple branches of the mains power grid lines that need to be repaired at the same maintenance point, since the lines on the construction site are relatively complex, it is not so efficient to ensure the accuracy of the line connection through a simple phase sequence detection device. Summary of the invention

[0005] In response to the application needs of the prior art, the purpose of the present invention is to provide a mobile power generation equipment that is suitable for realizing synchronous switching of mains power when multi-branch mains power is being repaired. It can easily complete the functions of frequency comparison, synchronous closing, automatic adjustment of power generation output, etc. between the mobile power generation equipment and the mains. The power consumption of users will not be affected during the mains maintenance. It also makes on-site construction simpler and ensures the working safety of the mobile power generation equipment.

[0006] Specifically, to achieve the purpose of the present invention, the present invention adopts the following technical solutions: A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance, comprising a box body, a diesel generator is arranged inside the box body, the diesel generator is arranged on a base at the bottom of the box body, and an integrated control box is arranged on one side of the box body, the integrated control box comprises an upper box chamber, a middle box chamber and a busbar load connection box chamber; wherein the upper box chamber is provided with a synchronous control module, the middle box chamber is provided with a generator synchronous contactor, a generator main circuit breaker, a mains synchronous contactor and a first current transformer, and the busbar load connection box chamber is provided with a plurality of busbar load terminals; a power supply control unit is arranged at the front end of the busbar load terminal, and the power supply control unit comprises a circuit breaker control module and a closing switch module; the circuit breaker control module comprises a first circuit breaker and a second circuit breaker arranged in parallel, and the diesel generator generates electricity through the circuit breaker control module The input end of the module flows into the first circuit breaker and the second circuit breaker and then outputs from the output end of the circuit breaker control module, and the phase sequence of the first circuit breaker input end is opposite to the phase sequence of the second circuit breaker input end, and the phase sequence of the first circuit breaker output end is opposite to the phase sequence of the second circuit breaker output end; the synchronous control module includes a working display screen, a generator working status key, a generator shutdown key, a generator Open / Close key, a manual operation key, a mains working status key, a mains Open / Close key and a generator start key; the synchronous control module is connected to the diesel generator, the generator synchronous contactor is connected to the diesel generator, the generator synchronous contactor is connected to the synchronous control module through a closing and feedback signal line, and the generator main circuit breaker is connected to the diesel generator synchronous contactor; the mains input end is connected to the synchronous control module through a synchronous sampling conversion switch.

[0007] Preferably, the closing switch module includes a first closing switch, a first opening switch, a second closing switch and a second opening switch, the first closing switch and the first opening switch are both connected to the first circuit breaker, and are respectively used to close and open the first circuit breaker, and the second closing switch and the second opening switch are connected to the second circuit breaker, and are respectively used to close and open the second circuit breaker.

[0008] More preferably, a plurality of one-to-one corresponding indicator lights are provided at the input and output ends of the current control unit, each indicator light corresponding to a phase, and whether the phase sequence remains consistent is displayed by the consistency of the light and dark sequence or color changes of the two groups of indicator lights.

[0009] More preferably, a first partition is provided between the upper box chamber and the middle box chamber, a second partition is provided between the middle box chamber and the busbar load connection box chamber, and a plurality of wire holes for cables to pass through are provided on the wall panel of the integrated control box and the first partition and the second partition.

[0010] More preferably, an indicator light is provided corresponding to each button on the synchronous control module.

[0011] More preferably, the synchronous control module is further provided with a plurality of function indication modules, including an alarm indication module, a warning indication module and an operation indication module.

[0012] More preferably, the synchronous control module, the mains synchronous contactor, the synchronous sampling conversion switch, and the current transformer are all integrated on the mobile power generation equipment.

[0013] More preferably, a cable quick interface with a standardized structure is provided at the interface of each module.

[0014] More preferably, a first cover plate and a second cover plate are provided on the outside of the integrated control box, the first cover plate corresponds to the upper box chamber and the middle box chamber; the second cover plate corresponds to the busbar load connection box chamber, and a gap is left under the second cover plate for cables to pass through.

[0015] More preferably, the secondary synchronous switching system composed of the mobile power generation equipment and the mains power includes a synchronous control module, the synchronous control module is connected to the diesel generator, the generator synchronous contactor is connected to the diesel generator, the generator synchronous contactor is connected to the synchronous control module through a closing and feedback signal line, and the generator main circuit breaker is connected to the generator synchronous contactor; the mains input end is connected to the synchronous control module after passing through a synchronous sampling conversion switch; a mains synchronous contactor is provided on the mains input line, the mains synchronous contactor is connected to the synchronous sampling conversion switch, and is connected to the synchronous control module through a closing and feedback signal line; the mains synchronous contactor is connected to the output end line of the generator main circuit breaker and is connected to the connection terminal of the busbar load connection box room; a busbar parameter acquisition module is provided between the busbar load and the synchronous sampling conversion switch; the secondary synchronous operation process is as follows: S1. Preparation at the same time: S11, turn the generator start knob switch 102 to the ON state, the generator powers on the synchronous control module, and triggers the manual operation button on the synchronous control module to enter the manual operation mode; S12, adjust the synchronous sampling conversion switch to the "secondary synchronization" mode; S13, first press the AC Close / Open button, and the AC synchronous contactor will close; S14. After the mains synchronous contactor is closed, turn off the main switch of the parallel mains incoming cabinet; S15. Press the generator start button to start the generator. After it runs normally, press the generator Close / Open button and the generator will automatically find synchronization and close. S16, after the generator is synchronously closed, the user load is automatically transferred from the mains to the generator; S17. After all the loads on the mains end have been transferred and the power is close to zero, immediately press the mains Close / Open button to disconnect the mains synchronous contactor. At this time, the loads have been completely transferred to the generator, the mains synchronous contactor and the main switch of the mains incoming cabinet have been disconnected, and the mains maintenance can be carried out. S2. Anti-synchronization preparation: S21. Before supplying power after the mains maintenance, check that the main switch of the mains incoming cabinet is in the off state; S22. Press the AC Close / Open button, the generator will automatically synchronize with the AC, and the AC synchronous contactor will automatically close; S23. After observing that the mains synchronous contactor is closed successfully, press the generator Close / Open button immediately to avoid long-term reverse power after synchronization. The generator load begins to transfer to the mains, and the generator synchronous contactor automatically opens and disconnects; S24. After confirming that the synchronous contactor of the generator is open, close the main switch of the incoming line cabinet of the city grid, press the stop button of the generator, and the generator stops; S25. After the generator stops, the module can be powered off directly, the generator start knob switch is turned to the OFF state, and the AC synchronous contactor automatically opens after a delay; at this time, the load has been completely transferred to the AC power, the AC synchronous contactor and the generator switch have been disconnected, and the quick-connect cable is disconnected to complete the entire maintenance process.

[0016] More preferably, in the above-mentioned step S15, the specific process of the generator automatically finding synchronization and closing is: the synchronous control module collects the current signal of the load at the mains end in real time through the first current transformer, and analyzes and determines the power size of the mains end; collects the current signal of the upper end of the mains synchronous contactor through the second current transformer; collects the current signal of the upper end of the generator synchronous contactor through the third current transformer; the synchronous control module feeds back the control signal to the generator according to the collected signal, and the generator adjusts the output voltage and operating frequency in real time according to the voltage and frequency of the mains. When the output voltage and frequency of the generator are consistent with the voltage and frequency of the mains end, the synchronous contactor of the generator can be closed, and the load is jointly powered by the mains and the diesel generator to achieve synchronous closing, and then the load is transferred from the mains to the generator.

[0017] More preferably, the primary synchronous switching system composed of the mobile power generation equipment and the mains power includes a synchronous control module, which is connected to the generator, a generator synchronous contactor connected to the generator, the generator synchronous contactor and the synchronous control module are connected through a closing and feedback signal line, and the generator main circuit breaker is connected to the generator synchronous contactor; a mains synchronous contactor is provided on the mains input line, the mains synchronous contactor is connected to the synchronous sampling conversion switch, and is connected to the synchronous control module through a closing and feedback signal line; the mains synchronous contactor and the generator main circuit breaker are connected to the user bus load connection box after the output end line is merged; a bus parameter acquisition module is provided between the user bus load and the synchronous sampling conversion switch; the primary synchronous operation process is as follows: S1, quick-connect cable is taken from the generator and the main switch load end of the main grid incoming cabinet, so that the generator load and the main switch load of the main grid incoming cabinet share the busbar; S2. Turn the generator start knob switch to the ON state, the generator powers on the synchronous control module, and triggers the manual operation button on the synchronous control module to enter the manual operation mode; S3, adjust the synchronous sampling conversion switch to the "one-time synchronization" mode; S4, constant power output of generator; S5. Press the AC Close / Open button first to simulate the closing of the AC synchronous contactor. In fact, the AC synchronous contactor is not closed at this time. S6. Using the mains load information collected by the first current transformer, repeatedly observe the load and current of the mains power grid to determine the actual load size; S7. Press the generator start button to start the generator. After it runs normally, press the generator Close / Open button, and the generator will automatically find synchronization, close, and transfer the load. S8. Note that after the load transfer is completed, when the actual load size is determined in step S6, the main switch of the main power supply cabinet is immediately disconnected; at this time, the load has been transferred to the diesel generator, the main power switch has been disconnected, and the main power maintenance can be started; S9. After the mains maintenance is completed, turn off the manual switch of the diesel generator main circuit breaker, press the generator stop button, and the generator will stop. After the generator stops steadily, disconnect the quick-connect cable, close the main switch of the mains incoming cabinet, and restore the mains power supply; Among them, in step S7, the specific process of the generator automatically finding synchronization and closing is: the synchronous control module collects the current signal of the load at the mains end in real time through the first current transformer, and analyzes and determines the power size of the mains end; the current signal at the upper end of the generator synchronous contactor is collected through the second current transformer, and the synchronous control module feeds back the control signal to the generator according to the collected signal. The generator adjusts the output voltage and operating frequency in real time according to the voltage and frequency of the mains. When the output voltage and frequency of the generator are consistent with the voltage and frequency of the mains end, the synchronous contactor of the generator can be closed, and the load is jointly powered by the mains and the diesel generator to achieve synchronous closing, and then the load is transferred from the mains to the generator.

[0018] The mobile power generation equipment of the present invention is suitable for synchronous switching of mains power during maintenance of multi-branch mains power. An integrated control box is arranged on the mobile power generation equipment, in which modules such as a synchronous control module, a mains synchronous contactor, and a current transformer are arranged. A secondary or primary synchronous switching system can be conveniently constructed with the mains power. During on-site construction, on-site wiring operations are performed according to the designed circuit, so that synchronous switching of mains power supply and generator power supply can be achieved during maintenance of the mains power line without affecting the users, thus avoiding losses caused by power outages to the users. On-site operation is convenient and fast, and the mobile diesel generator can flexibly adapt to different operating environments. Through the power supply regulation unit, the voltage output by the diesel generator and the voltage received by the user load end always maintain a positive phase sequence, thereby ensuring the working safety of the mobile power generation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present invention will become apparent from the following detailed description in conjunction with the accompanying drawings, in which: Figure 1 It is a structural schematic diagram of a mobile power generation device suitable for synchronous switching during multi-branch mains maintenance according to an embodiment of the present invention; Figure 2 The figure shows a schematic diagram of the structure of the integrated control box of the mobile power generation equipment of the present invention; Figure 3 It is a schematic diagram of the circuit connection structure in the integrated control box of the mobile power generation equipment of the present invention; Figure 4 The figure shows a schematic diagram of the module composition of the mobile power generation equipment of the present invention and the secondary synchronous switching of the mains; Figure 5 Shown Figure 4 Schematic diagram of the circuit connection between the mobile power generation equipment and the secondary synchronous switching system of the mains; Figure 6 Shown Figure 5 An enlarged schematic diagram of the circuit in the left dashed box shown in FIG. Figure 7 Shown Figure 5An enlarged schematic diagram of the circuit in the right dashed box shown in FIG. Figure 8 Shown Figure 4 Schematic diagram of current signal acquisition for secondary synchronous closing control of mobile power generation equipment and secondary synchronous switching system of mains power; Fig. 9 It is a schematic diagram of the circuit structure of the circuit breaker control module of the power control unit of the mobile power generation equipment of the present invention; Fig.10 The figure shows a schematic diagram of the module composition of the mobile power generation equipment of the present invention and the primary synchronous switching of the mains power; Fig.11 Shown Fig.10 Schematic diagram of the circuit connection between the mobile power generation equipment and the mains primary synchronous switching system; Fig.12 Shown Fig.11 An enlarged schematic diagram of the circuit in the left dashed box shown in FIG. Fig.13 Shown Fig.11 An enlarged schematic diagram of the circuit in the right dashed box shown in FIG. Fig.14 Shown Fig.10 Schematic diagram of current signal acquisition for primary synchronous closing control of mobile power generation equipment and primary synchronous switching system of mains power; Fig.15 The figure shows the external structure schematic diagram of the mobile power generation equipment of the present invention which is suitable for synchronous switching of mains power during maintenance of multi-branch mains power. DETAILED DESCRIPTION

[0020] According to the purpose of the present invention and actual application needs, the present invention provides a mobile power generation equipment suitable for synchronous switching during multi-branch mains maintenance, so that when the mains power line is being repaired, the mobile generator can be used for synchronous switching to supply power to the user's load, thereby avoiding affecting the user's electricity consumption.

[0021] Phase sequence refers to the phase difference between three-phase voltages or currents in a three-phase AC system. In an AC power grid, the correctness of the phase sequence plays a vital role in the operation and protection of power equipment. When the phase sequence of the three-phase voltage or current is disordered, a series of problems will arise, such as motor reversal, which makes the equipment unable to work normally; it causes uneven distribution of the magnetic field of the transformer, causing vibration and noise; it makes it impossible for the protection device in the power system to correctly judge the fault; it may even cause dangers such as fire and explosion. The adjustment of the phase sequence is generally achieved by changing the connection method in the circuit, that is, the circuit with the adjusted phase sequence is electrically exchanged with other circuits with normal phase sequence, that is, the detection instrument is used to detect the cables one by one after the cables are connected as described in the above background technology. If the phase sequence is found to be wrong, the connection port is adjusted until the phase sequence is consistent. This method is very inefficient when there are many cables on the construction site. The technical means adopted by the present invention is to set a phase sequence automatic adjustment or control device in the circuit, which is more effective for local city network maintenance such as low-voltage power grids and small-scale power systems.

[0022] In order to achieve the purpose of the present invention, a power control unit is arranged on the output line of the diesel generator of the mobile power generation equipment. Since the phase sequence of the power output of the diesel generator is fixed, the power control unit can monitor and control the phase sequence of the connected user load end, and the power output by the diesel generator is output to the user after the phase sequence is adjusted by the power control unit. In this way, it is convenient to carry out rotation maintenance of multi-branch municipal networks during on-site construction, and the operation is convenient and fast.

[0023] Specifically, refer to Figure 1 The structure diagram of a mobile power generation device 20 suitable for synchronous switching of mains power during multi-branch mains maintenance according to an embodiment of the present invention is shown in the figure. The mobile power generation device 20 comprises a box 1, inside which a diesel generator is arranged. The diesel generator is arranged on a base 3 at the bottom of the box 1. On one side of the box, an integrated control box 2 is arranged. Figure 2 and Figure 3 As shown, the integrated control box 2 includes an upper box chamber 201, a middle box chamber 202 and a busbar load connection box chamber 40; wherein the upper box chamber 201 is provided with a synchronous control module 100, the middle box chamber 202 is provided with a generator synchronous contactor 22, a generator main circuit breaker 24, a mains synchronous contactor 12 and a first current transformer 14, and the busbar load connection box chamber 40 is provided with a plurality of busbar load terminals 42; a power supply control unit 50 is provided at the front end of the busbar load terminal 42, and the power supply control unit includes a circuit breaker control module 51 and a closing switch module 52; the circuit breaker control module 51 includes a first circuit breaker 511 and a second circuit breaker 512 arranged in parallel (refer to Fig. 9), the electricity generated by the diesel generator flows into the first circuit breaker 511 and the second circuit breaker 512 through the input end of the circuit breaker control module 51 and is output from the output end of the circuit breaker control module 51, and the phase sequence of the input end of the first circuit breaker 511 is opposite to the phase sequence of the input end of the second circuit breaker 512, and the phase sequence of the output end of the first circuit breaker 511 is opposite to the phase sequence of the output end of the second circuit breaker 512; the synchronous control module 100 includes a working display screen 106, a generator working status key 120, a generator stop key 122, a generator Open / Close key 123, a manual operation key 125, a mains working status key 110, a mains Open / Close key 113 and a generator start key 112.

[0024] In a preferred embodiment, the closing switch module 52 includes a first closing switch, a first opening switch, a second closing switch and a second opening switch. The first closing switch and the first opening switch are both connected to the first circuit breaker 511, and are respectively used to close and open the first circuit breaker 511. The second closing switch and the second opening switch are connected to the second circuit breaker 512, and are respectively used to close and open the second circuit breaker 512.

[0025] In another preferred embodiment, Figure 2 As shown, a first partition 203 is provided between the upper box chamber 201 and the middle box chamber 202, a second partition 204 is provided between the middle box chamber 202 and the busbar load connection box chamber 40, and a plurality of wire holes 205 for cables to pass through are provided on the wall panel of the integrated control box 2 and the first partition 203 and the second partition 204, so as to facilitate the routing of the cables and keep the cables tidy to avoid confusion and misconnection of the cables.

[0026] When the mobile power generation equipment of the present invention is switched synchronously with the mains, a secondary synchronous switching system can be implemented according to usage requirements, that is, the user can achieve zero-perception power switching before and after the mains maintenance; or a single synchronous switching system can be implemented, that is, the user can achieve zero-perception power switching before the mains maintenance, and after the mains maintenance is completed, the mobile power generation equipment needs to be disconnected once and then switched on to the mains.

[0027] Specific, combined with reference Figure 3 and Figure 4As shown, when the mobile power generation equipment of the present invention performs secondary synchronous switching with the mains, the secondary synchronous switching system formed with the mains includes a synchronous control module 100, a diesel generator 20 connected to the synchronous control module 100, and a generator synchronous contactor 22 connected to the diesel generator 20, the generator synchronous contactor 22 is connected to the synchronous control module 100 through a closing and feedback signal line, and the generator main circuit breaker 24 is connected to the generator synchronous contactor 22; the input end of the mains 10 is connected to the synchronous control module 100 after passing through the synchronous sampling conversion switch 30; a mains synchronous contactor 12 is provided on the input line of the mains 10, the mains synchronous contactor 12 is connected to the synchronous sampling conversion switch 30, and is connected to the synchronous control module 100 through a closing and feedback signal line; the output end lines of the mains synchronous contactor 12 and the generator main circuit breaker 24 are merged and connected to the wiring terminal of the busbar load connection box chamber 40; a busbar parameter acquisition module is provided between the busbar load and the synchronous sampling conversion switch 30.

[0028] Among them, the synchronous control module 100 is used to receive data information and analyze it; send out voltage and frequency control signals; output opening and closing instructions; output protection alarm instructions; monitor key parameters such as voltage, current, water temperature, and oil pressure; the mobile power generation equipment 20 generally adopts a diesel generator, which can output reliable AC power for load use; the generator synchronous contactor 22 is controlled by the synchronous control module 100 to realize the on and off of the diesel generator output; the generator main circuit breaker 24 is a manual switch on the diesel generator output route, which is connected in series with the generator synchronous contactor. Through the manual switch, an additional safety guarantee is provided when the generator is disconnected; the synchronous sampling conversion switching switch 30, through the conversion switch, switches the sampling positions of different lines, and transmits the sampling information to the synchronous control module, and the synchronous control module determines the synchronous mode based on the sampling information.

[0029] Reference Figure 3 The module composition diagram of the mobile power generation equipment and the mains secondary synchronous switching system of the present invention is shown. The mobile power generation equipment in this embodiment adopts a diesel generator (referred to as generator); the synchronous control module 100 includes a working display screen 106, a generator working status key 120, a generator stop button 122, a generator Open / Close button 123, a manual operation button 125, a mains working status key 110, a mains Open / Close button 113 and a generator start button 112; the synchronous sampling conversion switch 30 and the generator start knob switch 102 are electrically connected to the synchronous control module 100.

[0030] According to the mobile power generation equipment and the secondary synchronous switching system of the mains of the present invention, when the mains needs to be repaired, the synchronous switching operation process of the mains and the generator includes positive synchronous preparation and reverse synchronous preparation. The positive synchronous preparation refers to: the mains is in a normal load state, the generator is connected to the grid to accept the load, the mains does not stop the load transfer, and the mains switch is cut off for maintenance; the upper and lower ends of the mains synchronous contactor are respectively connected to the upper and lower ends of the main switch of the mains incoming cabinet, so that the contactor and the main switch of the mains incoming cabinet are connected in parallel, and the neutral line of the mains is connected with the neutral line of the generator; the reverse synchronous preparation refers to transferring the load of the generator to the mains after the mains maintenance is completed; specifically, the synchronous operation process of this embodiment is as follows: S1. Preparation at the same time: S11, turn the generator start knob switch 102 to the ON state, the generator powers on the synchronous control module 100, and triggers the manual operation button 125 on the synchronous control module 100 to enter the manual operation mode; S12, adjusting the synchronous sampling conversion switch 30 to the "secondary synchronous" mode; S13, first press the mains Close / Open button 113, and the mains synchronous contactor 12 is closed; S14, after the mains synchronous contactor 12 is closed, turn off the main switch of the parallel mains incoming cabinet. Figure 1 User low voltage load switch in; S15. Press the generator start button 112 to start the generator. After the generator runs normally, press the generator Close / Open button 123, and the generator will automatically find synchronization and close. S16, after the generator is synchronously closed, the user load is automatically transferred from the mains to the generator; S17, the power control unit 50 detects and adjusts the voltage phase sequence received by the load end to be consistent with the output voltage phase sequence of the diesel generator, and then the closing switch module 52 closes the switch to supply the generator voltage to the user load; S18. After observing that all loads on the mains end have been transferred and the power is close to zero, immediately press the mains Close / Open button 113 to disconnect the mains synchronous contactor. At this time, the load has been completely transferred to the generator, the mains synchronous contactor and the main switch of the mains incoming cabinet have been disconnected, and the mains maintenance can be carried out. S2. Anti-synchronization preparation: S21. Before supplying power after the mains maintenance, check that the main switch of the mains incoming cabinet is in the off state; S22. Press the AC Close / Open button 113, the generator will automatically synchronize with the AC, and the AC synchronous contactor will automatically close; S23. After observing that the mains synchronous contactor is closed successfully, immediately press the generator Close / Open button 123 to avoid long-term reverse power after synchronization. The generator load begins to transfer to the mains, and the generator synchronous contactor automatically opens and disconnects; S24. After confirming that the synchronous contactor of the generator is open, close the main switch of the incoming line cabinet of the city grid, press the stop button 122 of the generator, and the generator stops; S25. After the generator stops, the module can be powered off directly, and the generator start knob switch 102 is turned to the OFF state. After a delay, the AC synchronous contactor automatically opens. At this time, the load has been completely transferred to the AC power, the AC synchronous contactor and the generator switch have been disconnected, and the quick-connect cable is disconnected to complete the entire maintenance process.

[0031] During the above operation, the mains synchronous contactor acts as a mains bypass switch. When the mains synchronous contactor is closed, the main switch of the mains incoming cabinet can be disconnected, and the mains can flow to the user load through the mains synchronous contactor; then after the generator is synchronously closed, when the user load is completely transferred from the mains to the generator, the mains synchronous contactor is disconnected. At this time, the mains and the load are completely separated, and the mains line maintenance work can be carried out.

[0032] In step S15, the specific process of the generator automatically finding synchronization and closing is as follows: Figure 4-Figure 8 As shown, the synchronous control module 100 collects the current signal of the load at the mains end in real time through the first current transformer 14, analyzes and determines the size of the power at the mains end; collects the current signal at the upper end of the mains synchronous contactor 12 through the second current transformer 16, that is, the current output current of the mains; collects the current signal at the upper end of the generator synchronous contactor 22 through the third current transformer 26, that is, the current output current of the generator; since the lower ends of the mains synchronous contactor 12 and the generator synchronous contactor 22 are connected to the load busbar end together, the synchronous control module can collect the current output current of the generator, the mains output current and frequency, and the current required by the load in real time, and the synchronous control module 100 feeds back the control signal to the generator according to the collected signal, and the generator adjusts the output voltage and operating frequency in real time according to the voltage and frequency of the mains. When the output voltage and frequency of the generator are consistent with the voltage and frequency of the mains end, the generator synchronous contactor can be closed, and the load is jointly powered by the mains and the diesel generator to achieve synchronous closing, and then the load is transferred from the mains to the generator. Similarly, in step S22 of reverse synchronization preparation, the same principle is used to find the synchronous closing of the generator and the mains, and after closing, the load is transferred from the generator to the mains.

[0033] In step S17, when the output power of the diesel generator with a positive phase sequence flows into the circuit breaker control module 51, by controlling the closing or opening of the first circuit breaker 511 and the second circuit breaker 512, the power supply output by the circuit breaker control module 51 can always maintain a positive phase sequence, thereby realizing the phase sequence regulation of the diesel generator power supply, effectively ensuring the safety and reliability of the diesel generator, reducing the time for manual adjustment of the user load end cable, and improving work efficiency, especially for the need to perform turn maintenance on multiple branch mains networks at the same construction site. In addition, in order to ensure the safety of the work, the auxiliary contact of the first circuit breaker 511 and the first auxiliary contact of the second circuit breaker 512 can be set to be electrically interlocked to avoid the two circuit breakers from closing at the same time. In addition, in a preferred embodiment, a plurality of one-to-one corresponding indicator lights are respectively provided at the input and output ends of the current control unit 50, each indicator light corresponding to a phase, and the consistency of the light and dark sequence or color change of the two groups of indicator lights allows the on-site maintenance personnel to intuitively understand the consistency of the phase sequence.

[0034] In another preferred embodiment, indicator lights 124 are provided corresponding to each button on the synchronization control module 100, so that the staff can understand the working status of each module of the system and the current operating environment in real time, and avoid safety problems caused by misoperation.

[0035] In another preferred embodiment, the synchronization control module 100 is further provided with a plurality of function indication modules, such as an alarm indication module 103 , a warning indication module 104 , an operation indication module 105 and the like.

[0036] In another preferred embodiment, the synchronous control module 100, the mains synchronous contactor 12, the synchronous sampling conversion switch 30, and the current transformer are all integrated on the mobile diesel generator. When on-site maintenance is required, the staff can operate after wiring according to the circuit connection diagram of the present invention; when the maintenance is completed, the cables can be removed from the mobile diesel generator. In another more preferred embodiment, a standardized cable fast interface is provided at the interface of each module to facilitate on-site wiring and disassembly operations.

[0037] Reference Fig.14 As shown, the mobile power generation equipment of the present invention is provided with a first cover plate 206 and a second cover plate 207 on the outside of the integrated control box 2, wherein the first cover plate 206 corresponds to the upper box chamber 201 and the middle box chamber 202; the second cover plate 207 corresponds to the busbar load connection box chamber 40, and a gap 208 for the cables to pass through is left below the second cover plate 207. A plurality of holes 301 for a crane or a forklift to be inserted are provided on the base 3, so that the mobile power generation equipment can be conveniently moved to a trailer for easy movement at different maintenance locations.

[0038] According to another embodiment of the present invention, Fig. 9 The module composition diagram of the primary synchronous switching system composed of the mobile power generation equipment of the present invention and the mains power shown in the figure includes a synchronous control module 100, a mobile generator 20 connected to the synchronous control module 100, and a generator synchronous contactor 22 connected to the mobile generator 20. The generator synchronous contactor 22 is connected to the synchronous control module 100 through a closing and feedback signal line, and the generator main circuit breaker 24 is connected to the generator synchronous contactor 22; a mains synchronous contactor 12 is provided on the mains power 10 input line, and the mains synchronous contactor 12 is connected to the synchronous sampling conversion switch 30, and is connected to the synchronous control module 100 through a closing and feedback signal line; the output end lines of the mains synchronous contactor 12 and the generator main circuit breaker 24 are connected to the user bus load terminal 40 after merging; a bus parameter acquisition module is provided between the user bus load and the synchronous sampling conversion switch 30. The primary synchronous switching means: the mains is in a normal load state, the generator is connected to the grid to accept the load, the load is transferred without stopping the mains, and the switch is cut off for maintenance; the lower end of the mains synchronous contactor is connected to the lower end of the main switch of the main network incoming cabinet, so that the main switch of the main network incoming cabinet and the load busbar of the generator set are shared, and the load end zero line is connected to the generator zero line; after the mains maintenance is completed, the generator is shut down, and the mains continues to supply power to the user load; specifically, the primary synchronous operation process of this embodiment is as follows: S1, quick-connect cable to take the generator and the main switch of the main power supply cabinet (i.e. Figure 1 The load end of the user low-voltage load switch shown in the figure can realize the sharing of the busbar between the generator load and the main switch load of the main grid incoming cabinet; S2. Turn the generator start knob switch 102 to the ON state, the generator powers on the synchronous control module 100, and triggers the manual operation button 125 on the synchronous control module 100 to enter the manual operation mode; S3, adjust the synchronous sampling conversion switch 30 to the "one-time synchronous" mode; S4, constant power output of generator; S5. Press the AC Close / Open button 113 to simulate the closing of the AC synchronous contactor. In reality, the AC synchronous contactor is not closed at this time. S6, using the mains load information collected by the first current transformer 14, repeatedly observing the load and current of the mains grid to determine the actual load size; S7. Press the generator start button 112 to start the generator. After the generator runs normally, press the generator Close / Open button 123, and the generator will automatically find synchronization, close, and transfer the load. S8, the power control unit 50 detects and adjusts the voltage phase sequence received by the load end to be consistent with the output voltage phase sequence of the diesel generator, and then the closing switch module 52 closes the switch to supply the generator voltage to the user load; S9. Note that after the load transfer is completed, when the actual load size is determined in step S6, the main switch of the main power supply cabinet is immediately disconnected; at this time, the load has been transferred to the diesel generator, the main power switch has been disconnected, and the main power maintenance can be started; S10. After the mains power maintenance is completed, turn off the manual switch of the diesel generator main circuit breaker, press the generator stop button 122, the generator will stop, and after the generator stops steadily, disconnect the quick-connect cable, close the main switch of the mains network incoming cabinet, and restore the mains power supply.

[0039] During the above operation, when the generator synchronous contactor is closed, the load is powered by both the mains and the generator set; then the main switch of the mains incoming cabinet is disconnected, and all user loads are transferred from the mains to the generator. At this time, the mains and the load are completely separated, and the mains line maintenance work can be carried out.

[0040] In step S5, the mains Close / Open button 113 is used to simulate the closing of the mains synchronous contactor, so that the on / off status of the power supply line, the load size, etc. can be checked. When the output power of the generator is consistent with the power required by the load, the main switch of the mains incoming cabinet is disconnected, which can improve the reliability and safety of the system.

[0041] In step S7, the specific process of the generator automatically finding synchronization and closing is as follows: Figure 9-13 As shown, the synchronous control module 100 collects the current signal of the load at the mains end in real time through the first current transformer 14, and analyzes and determines the size of the power at the mains end; the current signal of the upper end of the generator synchronous contactor 22 is collected through the second current transformer 26, that is, the current output current of the generator; because the lower ends of the mains synchronous contactor 12 and the generator synchronous contactor 22 are connected to the load busbar end together, the synchronous control module can collect the current output current of the generator and the current required by the load in real time, and the synchronous control module 100 feeds back the control signal to the generator according to the collected signal, and the generator adjusts the output voltage and operating frequency in real time according to the voltage and frequency of the mains. When the output voltage and frequency of the generator are consistent with the voltage and frequency of the mains end, the generator synchronous contactor can be closed, and the load is jointly powered by the mains and the diesel generator to achieve synchronous closing, and then the load is transferred from the mains to the generator.

[0042] The mobile power generation equipment of the present invention is suitable for synchronous switching of mains power during maintenance of multi-branch mains power. An integrated control box is arranged on the mobile power generation equipment, in which modules such as a synchronous control module, a mains synchronous contactor, and a current transformer are arranged, which can be convenient for constructing a secondary or primary synchronous switching system with the mains power. During on-site construction, on-site wiring operations are performed according to the designed circuit, so that synchronous switching of the mains power supply and the generator power supply can be realized during the maintenance of the mains power line, which will not affect the user and avoid the loss caused to the user by power failure; the on-site operation is convenient and fast, and the mobile diesel generator can flexibly adapt to different working environments; through the power supply control unit, the voltage output by the diesel generator and the voltage received by the user load end always maintain a positive phase sequence, ensuring the working safety of the mobile power generation equipment. It should be understood that although the present invention is more efficient for the maintenance of multi-branch mains power networks, it can also be applied to the situation where only one branch of the mains power is repaired on site, which can also improve work efficiency and ensure safety.

[0043] The present invention is not limited to the described embodiments. Those skilled in the art may make some modifications or changes without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance, characterized in that: The mobile power generation equipment includes a box body, in which a diesel generator is arranged, and the diesel generator is arranged on a base at the bottom of the box body. On one side of the box body, an integrated control box is arranged, and the integrated control box includes an upper box chamber, a middle box chamber and a busbar load connection box chamber; wherein the upper box chamber is provided with a synchronous control module, the middle box chamber is provided with a generator synchronous contactor, a generator main circuit breaker, a city power synchronous contactor and a first current transformer, and the busbar load connection box chamber is provided with a plurality of busbar load terminals; a power supply control unit is arranged at the front end of the busbar load terminal, and the power supply control unit includes a circuit breaker control module and a closing switch module; the circuit breaker control module includes a first circuit breaker and a second circuit breaker arranged in parallel, and the electricity generated by the diesel generator flows into the first circuit breaker through the input end of the circuit breaker control module. A circuit breaker and a second circuit breaker are output from the output end of the circuit breaker control module, and the phase sequence of the first circuit breaker input end is opposite to the phase sequence of the second circuit breaker input end, and the phase sequence of the first circuit breaker output end is opposite to the phase sequence of the second circuit breaker output end; the synchronous control module includes a working display screen, a generator working status key, a generator shutdown key, a generator Open / Close key, a manual operation key, a mains working status key, a mains Open / Close key and a generator start key; the synchronous control module is connected to the diesel generator, the generator synchronous contactor is connected to the diesel generator, the generator synchronous contactor is connected to the synchronous control module through a closing and feedback signal line, and the generator main circuit breaker is connected to the diesel generator synchronous contactor; the mains input end is connected to the synchronous control module through a synchronous sampling conversion switch.

2. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 1, characterized in that: The closing switch module includes a first closing switch, a first opening switch, a second closing switch and a second opening switch. The first closing switch and the first opening switch are both connected to the first circuit breaker and are respectively used to close and open the first circuit breaker. The second closing switch and the second opening switch are connected to the second circuit breaker and are respectively used to close and open the second circuit breaker.

3. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 2, characterized in that: A plurality of one-to-one corresponding indicator lights are provided at the input and output ends of the current control unit, each indicator light corresponding to a phase, and whether the phase sequence remains consistent is displayed by the consistency of the light and dark sequence or color changes of the two groups of indicator lights.

4. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 1, characterized in that: A first partition is provided between the upper box chamber and the middle box chamber, a second partition is provided between the middle box chamber and the busbar load connection box chamber, and a plurality of wire holes for cables to pass through are provided on the wall panel of the integrated control box and the first partition and the second partition.

5. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 1, characterized in that: The synchronous control module is provided with indicator lights corresponding to each button.

6. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 1, characterized in that: The synchronous control module is also provided with a plurality of function indication modules, including an alarm indication module, a warning indication module and an operation indication module.

7. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 4, characterized in that: A first cover plate and a second cover plate are arranged on the outside of the integrated control box, the first cover plate corresponds to the upper box chamber and the middle box chamber; the second cover plate corresponds to the busbar load connection box chamber, and a gap is left under the second cover plate for cables to pass through.

8. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 1, characterized in that: The secondary synchronous switching system composed of the mobile power generation equipment and the mains power includes a synchronous control module, the synchronous control module is connected to the diesel generator, the generator synchronous contactor is connected to the diesel generator, the generator synchronous contactor is connected to the synchronous control module through a closing and feedback signal line, and the generator main circuit breaker is connected to the generator synchronous contactor; the mains input end is connected to the synchronous control module after passing through a synchronous sampling conversion switch; a mains synchronous contactor is provided on the mains input line, the mains synchronous contactor is connected to the synchronous sampling conversion switch, and is connected to the synchronous control module through a closing and feedback signal line; the mains synchronous contactor is connected to the output end line of the generator main circuit breaker and then connected to the busbar load connection box room; a busbar parameter acquisition module is provided between the busbar load and the synchronous sampling conversion switch; the secondary synchronous operation process is as follows: S1. Preparation at the same time: S11, turn the generator start knob switch 102 to the ON state, the generator powers on the synchronous control module, and triggers the manual operation button on the synchronous control module to enter the manual operation mode; S12, adjust the synchronous sampling conversion switch to the "secondary synchronization" mode; S13, first press the AC Close / Open button, and the AC synchronous contactor will close; S14. After the mains synchronous contactor is closed, turn off the main switch of the parallel mains incoming cabinet; S15. Press the generator start button to start the generator. After it runs normally, press the generator Close / Open button and the generator will automatically find synchronization and close. S16, after the generator is synchronously closed, the user load is automatically transferred from the mains to the generator; S17, the power control unit detects and adjusts the voltage phase sequence received by the load end to be consistent with the output voltage phase sequence of the diesel generator, and then closes the switch module to supply the generator voltage to the user load; S18. After all the loads on the mains end have been transferred and the power is close to zero, immediately press the mains Close / Open button to disconnect the mains synchronous contactor. At this time, the loads have been completely transferred to the generator, the mains synchronous contactor and the main switch of the mains incoming cabinet have been disconnected, and the mains maintenance can be carried out. S2. Anti-synchronization preparation: S21. Before supplying power after the mains maintenance, check that the main switch of the mains incoming cabinet is in the off state; S22. Press the AC Close / Open button, the generator will automatically synchronize with the AC, and the AC synchronous contactor will automatically close; S23. After observing that the mains synchronous contactor is closed successfully, press the generator Close / Open button immediately to avoid long-term reverse power after synchronization. The generator load begins to transfer to the mains, and the generator synchronous contactor automatically opens and disconnects; S24. After confirming that the synchronous contactor of the generator is open, close the main switch of the incoming line cabinet of the city grid, press the stop button of the generator, and the generator stops; S25, after the generator stops, the module can be powered off directly, the generator start knob switch is turned to the OFF state, and the mains synchronous contactor automatically opens after a delay; at this time, the load has been completely transferred to the mains, the mains synchronous contactor and the generator switch have been disconnected, and the quick-connect cable is disconnected to complete the entire maintenance process; Among them, in the above-mentioned step S15, the specific process of the generator automatically finding synchronization and closing is: the synchronous control module collects the current signal of the load at the mains end in real time through the first current transformer, and analyzes and determines the power size of the mains end; collects the current signal of the upper end of the mains synchronous contactor through the second current transformer; collects the current signal of the upper end of the generator synchronous contactor through the third current transformer; the synchronous control module feeds back the control signal to the generator according to the collected signal, and the generator adjusts the output voltage and operating frequency in real time according to the voltage and frequency of the mains. When the output voltage and frequency of the generator are consistent with the voltage and frequency of the mains end, the synchronous contactor of the generator can be closed, and the load is jointly powered by the mains and the diesel generator to achieve synchronous closing, and then the load is transferred from the mains to the generator.

9. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 1, characterized in that: The primary synchronous switching system composed of the mobile power generation equipment and the mains power comprises a synchronous control module, a generator connected thereto, a generator synchronous contactor connected thereto, the generator synchronous contactor and the synchronous control module are connected via a closing and feedback signal line, and the generator main circuit breaker is connected to the generator synchronous contactor; a mains synchronous contactor is provided on the mains input line, the mains synchronous contactor is connected to the synchronous sampling conversion switch, and is connected to the synchronous control module via a closing and feedback signal line; the mains synchronous contactor and the generator main circuit breaker are connected to the connection terminal in the user busbar load connection box room after the output end line is merged; a busbar parameter acquisition module is provided between the user busbar load and the synchronous sampling conversion switch; the primary synchronous operation process is as follows: S1, quick-connect cable is taken from the generator and the main switch load end of the main grid incoming cabinet, so that the generator load and the main switch load of the main grid incoming cabinet share the busbar; S2. Turn the generator start knob switch to the ON state, the generator powers on the synchronous control module, and triggers the manual operation button on the synchronous control module to enter the manual operation mode; S3, adjust the synchronous sampling conversion switch to "one-time synchronization" mode; S4, constant power output of generator; S5. Press the AC Close / Open button first to simulate the closing of the AC synchronous contactor. In fact, the AC synchronous contactor is not closed at this time. S6. Using the mains load information collected by the first current transformer, repeatedly observe the load and current of the mains power grid to determine the actual load size; S7. Press the generator start button to start the generator. After it runs normally, press the generator Close / Open button, and the generator will automatically find synchronization, close, and transfer the load. S8, the power control unit detects and adjusts the voltage phase sequence received by the load end to be consistent with the output voltage phase sequence of the diesel generator, and then closes the switch module to supply the generator voltage to the user load; S9. Note that after the load transfer is completed, when the actual load size is determined in step S6, the main switch of the main power supply cabinet is immediately disconnected; at this time, the load has been transferred to the diesel generator, the main power switch has been disconnected, and the main power maintenance can be started; S10. After the mains maintenance is completed, turn off the manual switch of the diesel generator main circuit breaker, press the generator stop button, and the generator will stop. After the generator stops steadily, disconnect the quick-connect cable, close the main switch of the mains incoming cabinet, and restore the mains power supply; Among them, in step S7, the specific process of the generator automatically finding synchronization and closing is: the synchronous control module collects the current signal of the load at the mains end in real time through the first current transformer, and analyzes and determines the power size of the mains end; the current signal at the upper end of the generator synchronous contactor is collected through the second current transformer, and the synchronous control module feeds back the control signal to the generator according to the collected signal. The generator adjusts the output voltage and operating frequency in real time according to the voltage and frequency of the mains. When the output voltage and frequency of the generator are consistent with the voltage and frequency of the mains end, the synchronous contactor of the generator can be closed, and the load is jointly powered by the mains and the diesel generator to achieve synchronous closing, and then the load is transferred from the mains to the generator.

10. A mobile power generation device suitable for synchronous switching of mains power during multi-branch mains maintenance as claimed in claim 8 or 9, characterized in that: The synchronous control module, the mains synchronous contactor, the synchronous sampling conversion switch, and the current transformer are all integrated on the mobile power generation equipment.

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