CN114552654A - Grid-connected electrical system - Google Patents
Grid-connected electrical system Download PDFInfo
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- CN114552654A CN114552654A CN202210283338.7A CN202210283338A CN114552654A CN 114552654 A CN114552654 A CN 114552654A CN 202210283338 A CN202210283338 A CN 202210283338A CN 114552654 A CN114552654 A CN 114552654A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
Abstract
The invention relates to the technical field of grid connection of power generation vehicles, in particular to a grid-connected electrical system which comprises a low-voltage power distribution network module, a power generation vehicle, an incoming cable, an outgoing cable and a transfer box with a synchronous phasing function, wherein the transfer box comprises an incoming socket, an outgoing socket, a quasi-synchronous grid connection device, an accelerator regulating switch module and an excitation regulating switch module, the power generation vehicle is provided with a power generation unit terminal row and a power generation vehicle-mounted socket, the power generation vehicle-mounted socket is connected with the incoming socket of the transfer box in a matched mode through the incoming cable, and the outgoing socket of the transfer box is connected with the low-voltage power distribution network module through the outgoing cable. The invention solves the problem that the traditional power generation vehicle can not automatically complete the functions of parallel operation and grid-connected power generation due to no synchronous device, solves the adverse effect that the old power generation vehicle needs to be powered off for a short time when power supply is ensured, and meets the requirement of the existing bypass power-uninterrupted operation.
Description
Technical Field
The invention relates to the technical field of grid connection of power generation vehicles, in particular to a grid-connected electrical system.
Background
With the continuous development of the technology, the requirements of users on the continuity and reliability of power supply are higher and higher, and the users are sensitive to power failure, even short-time power failure. The low-voltage distribution network is wide in distribution, multiple in branches and complex in line wiring, researches on low-voltage distribution network energy storage synchronization grid-connected devices which directly distribute electric energy to vast residential users are few, and the low-voltage distribution network energy storage synchronization grid-connected devices are limited by conditions such as distribution points and load levels, and a part of distribution transformers cannot be communicated with other distribution transformers, so that low-voltage load transfer during power failure needs to be realized by means of a power generation vehicle. Because the technology is mature and the price is low, an energy storage device which serves as an emergency power supply task in the existing power grid is generally a diesel generating car, but when the diesel generating car is connected to the power grid, a certain frequency, a certain voltage phase angle and a certain voltage amplitude difference exist between the diesel generating car and the power grid, a certain waiting time is needed for the traditional quasi-synchronization grid connection operation, the risk of grid connection failure exists when the frequency difference is large, further impact is caused on the power grid, and the existing generating car cannot automatically complete the functions of parallel operation and grid connection power generation because of no synchronization device.
Disclosure of Invention
The invention provides a grid-connected electrical system aiming at the problems in the prior art, which solves the problems that the traditional power generation vehicle cannot automatically complete the functions of parallel operation and grid-connected power generation due to no synchronous device, solves the adverse effect that the old power generation vehicle needs short-time power failure when power supply is ensured, and meets the requirement of the existing bypass uninterrupted operation.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a grid-connected electrical system, which comprises a low-voltage distribution network module, a power generation car, an incoming cable, an outgoing cable and a transfer box with a synchronous phase-checking function, wherein the transfer box comprises an incoming socket, an outgoing socket, a quasi-synchronous grid-connected device, an accelerator regulating switch module and an excitation regulating switch module, the power generation car is provided with a generator set terminal bar and a power generation car vehicle-mounted socket, the power generation car vehicle-mounted socket is in matched connection with a socket through the incoming cable, the incoming socket is connected with the outgoing socket, the outgoing socket is connected with the low-voltage distribution network module through the outgoing cable, the generator set terminal bar is respectively connected with the quasi-synchronous grid-connected device, the accelerator regulating switch module and the excitation regulating switch module, and the accelerator regulating switch module and the excitation regulating switch module are respectively connected with the quasi-synchronous grid-connected device, and the quasi-synchronization grid-connected device is connected with the low-voltage distribution network module.
The transfer box further comprises an electric operating mechanism and a switching-on and switching-off switch connected with the electric operating mechanism, the switching-on and switching-off switch is respectively connected with a switching-on indicating lamp and a switching-off indicating lamp, the switching-on indicating lamp and the switching-off indicating lamp are respectively connected to two contact switches F12, a contact switch F12 is connected with an A09 port of the quasi-synchronization grid-connected device, and a control end S1 and a control end S2 of the electric operating mechanism are respectively connected to an automatic synchronization switching-on output port B09 and an automatic synchronization switching-on output port B10 of the quasi-synchronization grid-connected device.
The adapter box further comprises a buzzer alarm, the buzzer alarm is provided with an air switch B14, and the air switch B14 is connected to a B11 port of the quasi-synchronization grid-connected device.
The model of the quasi-synchronization grid-connected device is GTZ-841.
And the bottom corners of the transfer box are rotatably provided with universal wheels.
The two ends of the incoming cable and the two ends of the outgoing cable are provided with cable male plugs, and the incoming socket, the outgoing socket and the vehicle-mounted socket of the generator car are provided with a plurality of female end connectors which are matched with the cable male plugs for conducting connection.
The main circuit breaker QF is arranged between the incoming line socket and the outgoing line socket, and when an incoming line cable is inserted into the incoming line socket and an outgoing line cable is inserted into the outgoing line socket, the main circuit breaker QF is closed.
Wherein, the transfer box still includes the low pressure nuclear phase appearance, inlet wire socket's female end connector includes A looks female end connector, B looks female end connector, C looks female end connector and N looks female end connector, A looks female end connector, B looks female end connector, C looks female end connector are connected with A looks power indicator, B looks power indicator and C looks power indicator respectively, A looks female end connector, B looks female end connector, C looks female end connector and N looks female end connector respectively with the low pressure nuclear phase appearance is connected.
And the female end connector of the outlet socket is connected with an outlet side power indicator lamp.
The multifunctional instrument is further arranged on the transfer box and connected with the outlet socket.
The invention has the beneficial effects that:
according to the invention, under the coordination of the low-voltage distribution network module, the power generation car and the transfer box, the mutual connection of the incoming cable, the outgoing cable, the incoming socket, the outgoing socket and the vehicle-mounted socket of the power generation car is utilized, and the quasi-synchronization grid-connected device is matched, so that the problems that the traditional power generation car cannot automatically complete the parallel operation and the grid-connected power generation function because of no synchronization device, the adverse effect of short-time power failure when the power supply of the old power generation car is guaranteed is solved, and the requirement of the existing bypass uninterrupted operation is met are solved; the utility model has the advantages of utilize the transfer box that possesses the quasi-synchronization device of being incorporated into the power networks, the synchronizing function that its possessed, the generating set terminal strip of generator car is connected in quasi-synchronization device of being incorporated into the power networks, throttle regulating switch module and excitation regulating switch module for synchronous reverse control former generator car diesel generating set frequency, voltage when inserting, thereby reach and incorporate into the power networks, novel structure, design benefit.
Drawings
Fig. 1 is a schematic block diagram of a grid-connected electrical system of the present invention.
Fig. 2 is a schematic diagram of a connection of a grid-connected electrical system according to the present invention.
Fig. 3 is an enlarged view of portion G in fig. 2.
Fig. 4 is an enlarged view of a portion H in fig. 2.
Fig. 5 is a schematic block diagram of the quasi-synchronous grid connection device of the present invention.
The reference numerals in fig. 1 to 5 include:
1. a low voltage distribution network module; 2. a power generation car; 3. a transfer box; 4. a wire inlet cable; 5. an outgoing cable; 6. an incoming line socket; 7. an outlet socket; 8. a quasi-synchronous grid-connected device; 9. an accelerator adjustment switch module; 10. an excitation adjusting switch module; 11. a generator set terminal block; 12. a power generation car vehicle-mounted socket; 13. an electric operating mechanism; 15. a switch-on/off switch; 16. a switch-on indicator light; 17. a brake-off indicator light; 18. a buzzer alarm; 19. a universal wheel; 20. a cable male plug; 21. a main breaker QF; 22. a low-voltage phase detector; 23. an A-phase power indicator lamp; 24. a B-phase power indicator lamp; 25. a C-phase power indicator lamp; 26. an outgoing side power indicator lamp; 27. a multifunctional instrument; 28. a manual and automatic quasi-synchronous switch; 29. a lock-out switch in synchronization; 30. and an alarm contact switch.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
A grid-connected electrical system is disclosed, as shown in FIGS. 1 to 5, and comprises a low-voltage distribution network module 1, a generator car 2, an incoming cable 4, an outgoing cable 5 and a transfer box 3 with a synchronization phase checking function, wherein the transfer box 3 comprises an incoming socket 6, an outgoing socket 7, a quasi-synchronization grid-connected device 8, an accelerator regulating switch module 9 and an excitation regulating switch module 10, the generator car 2 is provided with a generator set terminal row 11 and a vehicle-mounted socket of the generator car 2, the vehicle-mounted socket of the generator car 2 is connected with the incoming socket 4 of the transfer box 3 in a matching way through the incoming cable 4, the outgoing socket 7 of the transfer box 3 is connected with the low-voltage distribution network module 1 through the outgoing cable 5, the generator set terminal row 11 is respectively connected with the quasi-synchronization grid-connected device 8, the accelerator regulating switch module 9 and the excitation regulating switch module 10 are respectively connected with the quasi-synchronization grid-connected device 8, the quasi-synchronization grid-connected device 8 is connected with the low-voltage distribution network module 1. Specifically, under the coordination of the low-voltage distribution network module 1, the generator car 2 and the transfer box 3, the mutual connection of the incoming cable 4, the outgoing cable 5, the incoming socket 6, the outgoing socket 7 and the vehicle-mounted socket of the generator car 2 is utilized, and the quasi-synchronization grid-connected device 8 is matched, so that the problems that the traditional generator car 2 cannot automatically complete parallel operation and grid-connected power generation functions due to the absence of synchronization devices, the adverse effect of short-time power failure when the old generator car 2 is supplied with power in a guaranteed manner is solved, and the requirement of the existing bypass non-power-stop operation is met are solved; by utilizing the transfer box 3 with the quasi-synchronization grid-connected device 8 and the synchronization function of the transfer box, the generator set terminal strip 11 of the generator car 2 is connected with the quasi-synchronization grid-connected device 8, the accelerator adjusting switch module 9 and the excitation adjusting switch module 10, so that the frequency and the voltage of the diesel generator set of the original generator car 2 are synchronously and reversely controlled during access, the parallel operation and grid-connected functions are achieved, and the transfer box is novel in structure and ingenious in design.
In this embodiment, the transfer box 3 further includes an electric operating mechanism 13 and a switching-on/off switch 15 connected to the electric operating mechanism 13, the switching-on/off switch 15 is connected to a switching-on indicator lamp 16 and a switching-off indicator lamp 17, the switching-on indicator lamp 16 and the switching-off indicator lamp 17 are connected to auxiliary contacts F11 and F12 of a main circuit breaker QF21 installed in the transfer box, the auxiliary contacts are connected to a ground line N of the low-voltage distribution network module 1 and a phase line a, and a control end S1 and a control end S2 of the electric operating mechanism 13 are connected to an automatic synchronous switching-on output port B09 and an automatic synchronous switching-on output port B10 of the quasi-synchronous grid-connection device 8, respectively; meanwhile, the control end S1 and the control end S2 of the electric operating mechanism 13 are respectively connected with the output terminals 1 and 2 of the switch-on/off switch 15 in parallel; the control terminal S4 is connected to the output terminal 8 of the switching switch 15. Specifically, with the above arrangement, the control of the opening/closing switch 15 realizes the manual/electric operation of the main breaker QF21 in the junction box.
In this embodiment, the transfer box 3 still buzzes alarm 18 and main circuit breaker QF, buzzing alarm 18 is provided with alarm contact switch, alarm contact switch is connected in main circuit breaker QF21 auxiliary alarm contact port, buzzing alarm 18's power supply terminal 1, 2 are connected with low voltage distribution network module 1 ground wire N looks and phase line a. Specifically, the setting realizes the control of the abnormal operation of the main loop of the junction box through the alarm function of the buzzer alarm 18.
In this embodiment, the model of the quasi-synchronization grid-connected device 8 is GTZ-841, and the transfer box 3 further includes a manual quasi-synchronization switch 28 and a synchronization locking switch 29, both of which are connected to the quasi-synchronization grid-connected device 8. The throttle regulating switch module 9, the excitation regulating switch module 10, the opening and closing switch 15, the manual and automatic quasi-synchronization switch 28 and the synchronization locking switch 29 are all LW38A series switches; the electric operating mechanism 13 is model number MD-M2. The quasi-synchronization grid-connected device 8 is provided with a system voltage Ua port a01, a system voltage Ub port a02, a voltage to be combined Ua port a03, a voltage to be combined Ub port a04, an automatic synchronization input signal port a05, a standby input signal (synchronization check input) port a06, a standby input signal (breaker position feedback) port a07, a standby input signal port a08, an input signal power (-) port a09, a working power L/+ port a11, a working power N/-port a12, speed-increasing adjustment output ports B01 and B02, speed-decreasing adjustment output ports B03 and B04, voltage-increasing adjustment output ports B05 and B06, voltage-decreasing adjustment output ports B07 and B08, automatic synchronization output ports B09 and B10, and standby (synchronization check output pass) ports B11 and B12.
In this embodiment, the bottom corners of the adapter box 3 are all rotatably provided with universal wheels 19. Specifically, the arrangement facilitates the movement of the transfer box 3, and is convenient to use and transfer.
In this embodiment, the both ends of incoming cable 4 and the both ends of being qualified for the next round of competitions cable 5 all are provided with cable male plug 20, incoming line socket 6, outlet socket 7 and the on-vehicle socket of generator car 2 all be provided with a plurality of with the female end connector of cable male plug 20 cooperation turn-on connection. Specifically, under the arrangement, the male cable plug 20 and the female terminal connector are directly connected in a matching manner, so that the plug-in socket 6 and the plug-out socket 7 of the transfer box 3 are mutually plugged and communicated with the vehicle-mounted socket of the generator car and the matching socket of the low-voltage distribution network module 1.
In this embodiment, a main circuit breaker QF21 is arranged between the incoming line socket 6 of the adaptor box 3 and the outgoing line socket 7 of the adaptor box 3, and when the incoming line cable 4 is inserted into the incoming line socket 6 and the outgoing line cable 5 is inserted into the outgoing line socket 7, and when the quasi-synchronization grid connection device 8 detects that the output power of the generator car 2 and the power of the low-voltage distribution network module 1 meet the grid connection condition, the main circuit breaker QF21 is closed. Specifically, after the power generation vehicle 2, the transfer box 3 and the low-voltage distribution network module 1 are networked by the incoming cable 4 and the outgoing cable 5, the on-off state of the circuit breaker QF21 is controlled by automatically judging whether the on-grid condition is met or not through manual/automatic control of the quasi-synchronization on-grid device 8.
In this embodiment, transfer box 3 still includes low pressure nuclear phase appearance 22, inlet wire socket 6's female end connector includes A looks female end connector, B looks female end connector, C looks female end connector and N looks female end connector, A looks female end connector, B looks female end connector, C looks female end connector are connected with A looks power indicator 23, B looks power indicator 24 and C looks power indicator 25 respectively, A looks female end connector, B looks female end connector, C looks female end connector, N looks female end connector and the RG-HXQ contact of low pressure nuclear phase appearance respectively with main circuit breaker QF connects, the contact of low pressure nuclear phase appearance 22 is connected in 3 major loops of transfer box. Specifically, the above arrangement facilitates observation of the power-on condition of the incoming line end of the adapter box 3 and judgment of whether the phase sequence of the incoming line end and the outgoing line end of the adapter box 3 is consistent or not through the low-voltage phase checking instrument 22, so that the power output of the generator car 2 is smoothly connected to the low-voltage distribution network module 1, and the use and the maintenance are convenient.
In this embodiment, the female end connector of the outlet socket 7 is connected to an outlet side power indicator lamp 26. Specifically, the above arrangement facilitates observation of the power-on condition of the wire outlet end of the adapter box 3, and is convenient to use and maintain.
In this embodiment, still be provided with multifunctional instrument 27 on the adaptor box 3, multifunctional instrument 27's model is PD666, multifunctional instrument 27 with adaptor box 3's outlet socket 7 is connected, the auxiliary contact F11, the F14 of multifunctional instrument 27 configuration respectively with the terminal row of buzzer siren is connected. Specifically, the arrangement facilitates observation and monitoring of the change conditions of the system voltage and current data after the power generation vehicle 2, the transfer box 3 and the low-voltage power distribution network module 1 are networked by utilizing the incoming cables 4 and the outgoing cables 5.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A grid-tied electrical system characterized by: comprises a low-voltage distribution network module, a power generation car, an incoming cable, an outgoing cable and a transfer box with the synchronous phase checking function, the transfer box comprises an incoming line socket, an outgoing line socket, a quasi-synchronization grid-connected device, an accelerator adjusting switch module and an excitation adjusting switch module, the power generation car is provided with a generator set terminal strip and a power generation car socket, the power generation car socket is connected with the inlet wire socket of the transfer box in a matching way through an inlet wire cable, the outlet socket of the transfer box is connected with the low-voltage distribution network module through an outlet cable, the generator set terminal strip is respectively connected with the quasi-synchronization grid-connected device, the accelerator regulating switch module and the excitation regulating switch module, the accelerator adjusting switch module and the excitation adjusting switch module are respectively connected with a quasi-synchronization grid-connected device, and the quasi-synchronization grid-connected device is connected with the low-voltage distribution network module.
2. The grid-connected electrical system according to claim 1, characterized in that: the transfer box further comprises an electric operating mechanism and a switching-on and switching-off switch connected with the electric operating mechanism, the switching-on and switching-off switch is respectively connected with a switching-on indicating lamp and a switching-off indicating lamp, the switching-on indicating lamp and the switching-off indicating lamp are respectively connected to two contact switches F12, a contact switch F12 is connected with an A09 port of the quasi-synchronization grid-connected device, and a control end S1 and a control end S2 of the electric operating mechanism are respectively connected to an automatic synchronization switching-on output port B09 and an automatic synchronization switching-on output port B10 of the quasi-synchronization grid-connected device.
3. The grid-connected electrical system according to claim 1, characterized in that: the transfer box further comprises a buzzer alarm and a main circuit breaker QF, wherein the buzzer alarm is provided with an alarm contact switch, and the alarm contact switch is connected to the main circuit breaker QF.
4. The grid-connected electrical system according to claim 1, characterized in that: the model of the quasi-synchronization grid-connected device is GTZ-841.
5. The grid-connected electrical system according to claim 1, characterized in that: the bottom edge of the transfer box is provided with universal wheels in a rotating mode.
6. The grid-connected electrical system according to claim 1, characterized in that: the two ends of the incoming cable and the two ends of the outgoing cable are provided with cable male plugs, and the incoming socket, the outgoing socket and the vehicle-mounted socket of the generator car are provided with a plurality of female end connectors which are matched with the cable male plugs for conducting connection.
7. The grid-connected electrical system according to claim 3, wherein: the main circuit breaker QF is arranged between the incoming line socket and the outgoing line socket, and when an incoming line cable is inserted into the incoming line socket and an outgoing line cable is inserted into the outgoing line socket, and when the quasi-synchronization grid connection device detects that the output power supply of the generator car and the low-voltage distribution network module power supply meet grid connection conditions, the main circuit breaker QF is closed.
8. The grid-connected electrical system according to claim 7, wherein: the transfer box still includes low pressure nuclear phase appearance, inlet wire socket's female end connector includes the female end connector of A looks, the female end connector of B looks, the female end connector of C looks and the female end connector of N looks, the female end connector of A looks, the female end connector of B looks, the female end connector of C looks are connected with A looks power indicator, B looks power indicator and C looks power indicator respectively, the female end connector of A looks, the female end connector of B looks, the female end connector of C looks, the female end connector of N looks and the RG-HXQ contact of low pressure nuclear phase appearance respectively with main circuit breaker QF connects.
9. The grid-connected electrical system according to claim 6, wherein: and the female end connector of the outlet socket is connected with an outlet side power indicator lamp.
10. The grid-connected electrical system according to claim 3, wherein: the multifunctional instrument is connected with the outlet socket of the adapter box, and auxiliary contacts F11 and F14 configured on the multifunctional instrument are respectively connected with the terminal strip of the buzzer alarm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210283338.7A CN114552654B (en) | 2022-03-22 | 2022-03-22 | Grid-connected electrical system |
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| CN202210283338.7A CN114552654B (en) | 2022-03-22 | 2022-03-22 | Grid-connected electrical system |
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| CN114552654B CN114552654B (en) | 2023-03-31 |
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