CN219592127U - Energy storage unit's switching system that goes out of network - Google Patents
Energy storage unit's switching system that goes out of network Download PDFInfo
- Publication number
- CN219592127U CN219592127U CN202321188327.7U CN202321188327U CN219592127U CN 219592127 U CN219592127 U CN 219592127U CN 202321188327 U CN202321188327 U CN 202321188327U CN 219592127 U CN219592127 U CN 219592127U
- Authority
- CN
- China
- Prior art keywords
- switch
- energy storage
- load
- grid
- storage unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Stand-By Power Supply Arrangements (AREA)
Abstract
The parallel-off-grid switching system of the energy storage unit comprises an alternating current bus, the energy storage unit, an emergency load switch, an emergency load unit and a terminal; the emergency load unit comprises a dual power supply change-over switch, a multi-stage load and a plurality of groups of load switches; the input end of the main switch of the dual-power supply change-over switch is connected with an alternating current bus, the input end of the standby switch of the dual-power supply change-over switch is connected with one end of the emergency load switch, and the other end of the emergency load switch is connected with the energy storage unit; the two ends of the load switch are respectively connected with the output end of the dual-power switch and the load. Automatic off-grid switching of the energy storage system is realized; meanwhile, the loads are arranged in a grading mode, so that the loads can be cut off in time in the off-grid mode, and the power supply of the energy storage unit is ensured to be supplied to important loads.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to a parallel-off-grid switching system of an energy storage unit.
Background
Along with the rapid development of energy storage technology, the energy storage technology is more and more widely applied to the field of power preparation. The traditional diesel generator has the advantages that the discharged smoke contains a large amount of sulfur dioxide to pollute the environment, the failure rate is high, the daily maintenance is tedious, and the maintenance cost is high. In the prior art, an energy storage technology and an advanced electric energy technology are combined, and an advanced energy storage battery is adopted to replace a diesel generator, so that the energy storage system has the characteristics of safety, energy conservation, no pollution and the like.
The existing energy storage station system has the grid-connected charging and discharging functions and the off-grid power supply function. In a corresponding system, one path of alternating current output is added as a port for load access, and when the power grid is powered off, the system is switched to an off-grid mode, so that normal power supply of the load is ensured.
In the existing grid-connected to grid-off switching method, the energy storage converter is switched in a seamless mode and is off-grid, when the load power is equal to the PCS rated charge-discharge power, and when the limited power at the discharge end of the battery cannot meet the load demand, the load cannot be controlled to be cut off in time, so that the load of the energy storage system is cut off, and the components are damaged.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the parallel-to-off-grid switching system of the energy storage unit is provided, automatic parallel-to-off-grid switching of the energy storage system is realized, and meanwhile, redundant loads can be cut off in an off-grid mode, so that the power supply of the energy storage unit is ensured to be supplied to important loads.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the parallel-off-grid switching system of the energy storage unit comprises an alternating current bus, the energy storage unit, an emergency load switch, an emergency load unit and a terminal;
the emergency load unit comprises a dual power supply change-over switch, a multi-stage load and a plurality of groups of load switches;
the input end of the main switch of the dual-power supply change-over switch is connected with the alternating current bus, the input end of the standby switch of the dual-power supply change-over switch is connected with one end of an emergency load switch, and the other end of the emergency load switch is connected with the energy storage unit;
the two ends of the load switch are respectively connected with the output end of the dual-power switch and the load;
the terminal is used for controlling the operation of the whole system.
Further, the load comprises a primary load and a secondary load, and the load switch comprises a primary load switch and a secondary load switch; two ends of the primary load switch are respectively connected with the output end of the dual-power switch and the primary load; and two ends of the secondary load switch are respectively connected with the output end of the dual-power switch and the secondary load.
Further, the energy storage unit comprises a current transformer, an energy storage unit switch, an energy storage converter and a battery module formed by electric cores which are sequentially connected in series; the current transformer is connected with the alternating current bus, and the other end of the emergency load switch is connected with the energy storage converter.
Further, the energy storage unit switch and the emergency load switch are molded case circuit breakers;
further, the system also comprises a grid-connected switch, wherein two ends of the grid-connected switch are respectively connected with the alternating current bus and the current transformer.
Further, the grid-connected switch is a universal circuit breaker, and the universal circuit breaker is provided with a voltage-losing tripping device.
Further, the load switch is an external contactor.
The utility model has the beneficial effects that: providing a parallel-to-off-grid switching system of an energy storage unit, wherein an input end of a double-current switch is respectively connected with an alternating current bus and the energy storage unit, and when the parallel-to-off-grid switching is performed, timeliness of power supply of a load is ensured; meanwhile, the loads are arranged in a grading mode, redundant loads can be cut off in an off-grid mode, and the power supply of the energy storage unit is ensured to supply important loads.
Drawings
Fig. 1 is a topology diagram of an off-grid switching system of an energy storage unit according to an embodiment of the present utility model;
fig. 2 is a flowchart of a network-to-network switching system of an energy storage unit according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a terminal of an off-grid switching system of an energy storage unit according to an embodiment of the present utility model;
FIG. 4 is a flow chart illustrating an overall discharging method according to an embodiment of the present utility model;
FIG. 5 is a flowchart of a discharging method according to an embodiment of the present utility model;
description of the reference numerals:
QF1, grid-connected switch; QF2, energy storage unit switch; QF3, emergency load switch;
QF4, a primary load switch; QF5, secondary load switch;
CT, current transformer; PCS, energy storage converter; ATS, dual power change-over switch.
Detailed Description
The present utility model has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
in the prior art, the important load is provided with a standby power supply, when the power failure or other conditions lead to power failure, the standby power supply is started, and sufficient standby power time is provided for the emergency load according to requirements so as to ensure the normal operation of the important load when the power failure occurs in the city, wherein the system to which the emergency load belongs comprises, but is not limited to, the following systems: fire protection systems, medical systems, information systems, security systems, etc.; however, in the operation process of the standby power supply (energy storage unit), the situation of insufficient electric quantity or power supply failure occurs, and for such situations, a system and scheme capable of adjusting power supply output and protecting the energy storage unit and performing intelligent control are needed.
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 3, a parallel-to-off-grid switching system of an energy storage unit is applied to the above-mentioned discharging method, and includes an ac bus, an energy storage unit, an emergency load switch QF3, an emergency load unit and a terminal;
the emergency load unit comprises a dual power supply change-over switch ATS, a multi-stage load and a plurality of groups of load switches;
the input end of the main switch of the dual-power supply change-over switch ATS is connected with the alternating current bus, the input end of the standby switch of the dual-power supply change-over switch ATS is connected with one end of an emergency load switch QF3, and the other end of the emergency load switch QF3 is connected with the energy storage unit;
the two ends of the load switch are respectively connected with the output end of the dual-power switch and the load;
the terminal is used for controlling the operation of the whole system.
From the above description, the beneficial effects of the utility model are as follows: providing a parallel-to-off-grid switching system of an energy storage unit, wherein an input end of a double-current switch is respectively connected with an alternating current bus and the energy storage unit, and when the parallel-to-off-grid switching is performed, timeliness of power supply of a load is ensured; meanwhile, the loads are arranged in a grading mode, and the loads can be cut off in time in the off-grid mode, so that the power supply of the energy storage unit is ensured to be supplied to important loads.
Further, the energy storage unit comprises a current transformer CT, an energy storage unit switch QF2, an energy storage converter PCS and a battery module formed by electric cores which are sequentially connected in series; the current transformer CT is connected with the alternating current bus, and the other end of the emergency load switch QF3 is connected with the energy storage converter PCS.
As can be seen from the above description, two ends of the current transformer CT are respectively connected to an ac bus and an energy storage unit switch QF2, and in one embodiment of the present utility model, the ac bus simultaneously supplies power to the energy storage unit and the emergency load unit when the power is connected to the grid; when the emergency load unit is off-grid, the energy storage unit supplies power to the emergency load unit.
Further, the power grid-connected device further comprises a grid-connected switch QF1, and two ends of the grid-connected switch QF1 are respectively connected with the alternating current bus and the current transformer CT.
As can be seen from the above description, in order to ensure the timeliness of the on-off of the ac bus and the energy storage unit, a grid-connected switch QF1 is disposed between the ac bus and the current transformer CT.
Further, the energy storage unit switch QF2 and the load switch are plastic shell type circuit breakers, the grid-connected switch QF1 is a universal circuit breaker, and the universal circuit breaker is provided with a voltage-losing tripping device; the load switch is an external contactor.
As can be seen from the above description, in one embodiment of the present utility model, the energy storage unit switch QF2 is a molded case circuit breaker, which provides overcurrent and protection functions, and is disposed inside the energy storage unit system to provide safety guarantee; the grid-connected switch QF1 is arranged in the client-side low-voltage power distribution cabinet, and a universal circuit breaker with a voltage-losing tripping function is adopted, so that when the mains supply fails, the mains supply and the energy storage unit are automatically cut off; besides, the load switch adopts an external contactor, supports multiple switching on and switching off, and has strong durability.
Further, the load comprises a primary load and a secondary load, and the load switch comprises a primary load switch and a secondary load switch; two ends of the primary load switch are respectively connected with the output end of the dual-power switch and the primary load; and two ends of the secondary load switch are respectively connected with the output end of the dual-power switch and the secondary load.
As can be seen from the above description, in one embodiment of the present utility model, the load stage takes 2 stages, and is divided into a primary load and a secondary load, wherein the primary load corresponds to the primary load switch QF4, and the secondary load corresponds to the secondary load switch QF5.
Specifically, in an embodiment of the present utility model, the off-network switching flow is as follows: the emergency load switch QF3 is in a closing state, when the terminal judges the voltage, current, frequency and other data of the alternating current ammeter and checks the voltage, current, frequency and other sampling data of the PCS, the commercial power outage is determined, and in the judging time 3s, the automatic switching off-grid process is started, and the control process is as follows: the grid-connected switch QF1 is automatically disconnected when in voltage loss, the dual-power supply change-over switch ATS is switched to the standby switch, and at the moment, the energy storage unit and the emergency load unit are connected.
Preferably, the terminal comprises an energy management system, a control module, a power acquisition module, a monitoring platform and a monitoring center, wherein the energy management system is cooperated with the PCS and the battery module to control all switches of the whole system under the adjustment of the control module, and output information of the power acquisition module is transmitted to the monitoring platform in real time, the monitoring platform is linked with the monitoring center to prompt the residual electric quantity of the current energy storage unit, early warning is carried out in advance, and intelligent control is realized.
The utility model provides a parallel-to-off network switching system of an energy storage unit, which is applied to a parallel-to-off network switching working condition in the energy storage field, and is described below with reference to an embodiment:
the first embodiment of the utility model is as follows: referring to fig. 1 to 3, a parallel-to-off-grid switching system of an energy storage unit includes an ac bus, the energy storage unit, a grid-connected switch QF1, an emergency load switch QF3, an emergency load unit and a terminal; the energy storage unit comprises a current transformer CT, an energy storage converter PCS and a battery module formed by electric cores which are sequentially connected in series; two ends of the grid-connected switch QF1 are respectively connected with an alternating current bus and a current transformer CT; the emergency unit system comprises a dual power supply change-over switch ATS, a primary load, a secondary load, a primary load switch QF4 and a secondary load switch QF5; the input end of a main switch of the dual power supply change-over switch ATS is connected with an alternating current bus, the input end of a standby switch of the dual power supply switch is connected with one end of an emergency load switch QF3, and the other end of the emergency load switch QF3 is connected with an energy storage converter PCS; two ends of the primary load switch QF4 are respectively connected with the output end of the dual-power switch and the primary load; two ends of the secondary load switch QF5 are respectively connected with the output end of the dual-power switch and the secondary load; the terminal is used for controlling the operation of the whole system.
In this embodiment, the power supply condition in the system is monitored in real time through the terminal, wherein the main switch at the input end of the dual-power supply change-over switch ATS is connected to the ac bus, the standby switch is connected to the energy storage unit, the output end of the standby switch is connected to the emergency load, and when the mains supply is powered off, the power supply change-over from the mains supply to the energy storage unit is completed by matching with the emergency load switch QF3 and the grid-connected switch QF1.
Preferably, the energy storage unit further comprises an energy storage unit switch QF2, and two ends of the energy storage unit switch QF2 are respectively connected with the current transformer CT and the energy storage converter PCS. The energy storage unit switch QF2 and the emergency load switch QF3 are plastic shell type circuit breakers. The grid-connected switch QF1 is a universal circuit breaker, and the universal circuit breaker is provided with a voltage-losing tripping device. The primary load switch QF4 and the secondary load switch QF5 are external contactors; the primary load comprises a fire-fighting fan, a fire-fighting center, a fire pump, an emergency lighting and evacuation indicating system and a monitoring center, and the secondary load comprises a security system, an information machine room, a channel, and an on-duty lighting and sewage pump.
The system comprises a current transformer CT, an energy storage unit switch QF1, a grid-connected switch QF2, a voltage-losing tripping function and a voltage-losing tripping function, wherein the two ends of the current transformer CT are respectively connected with the grid-connected switch QF1 and the energy storage unit switch QF2, the grid-connected switch QF1 is arranged in a client-side low-voltage power distribution cabinet, and a universal circuit breaker with the voltage-losing tripping function is adopted, so that when a mains supply fails, the mains supply and the energy storage unit are automatically cut off; the energy storage unit switch QF2 adopts a molded case circuit breaker to provide overcurrent and protection functions, is arranged in an energy storage unit system and provides safety guarantee; in addition, the primary load switch QF4 and the secondary load switch QF5 adopt external contactors, so that the switch is supported to be switched on and off repeatedly, and the durability is high.
In this embodiment, the off-network switching flow is as follows: the emergency load switch QF3 is in a closing state, when the terminal judges the voltage, current, frequency and other data of the alternating current ammeter and checks the voltage, current, frequency and other sampling data of the PCS, the commercial power outage is determined, and in the judging time 3s, the automatic switching off-grid process is started, and the control process is as follows: the grid-connected switch QF1 is automatically disconnected when in voltage loss, the dual-power supply change-over switch ATS is switched to the standby switch, and at the moment, the energy storage unit and the emergency load unit are connected.
In summary, the utility model provides a parallel-to-off-grid switching system of an energy storage unit, wherein the input ends of a double-current switch are respectively connected with an alternating current bus and the energy storage unit, and when the parallel-to-off-grid switching is performed, timeliness of load power supply is ensured; meanwhile, the loads are arranged in a grading mode, and the loads can be cut off in time in the off-grid mode, so that the power supply of the energy storage unit is ensured to be supplied to important loads.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (7)
1. The parallel-to-off-grid switching system of the energy storage unit is characterized in that: the system comprises an alternating current bus, an energy storage unit, an emergency load switch, an emergency load unit and a terminal;
the emergency load unit comprises a dual power supply change-over switch, a multi-stage load and a plurality of groups of load switches;
the input end of the main switch of the dual-power supply change-over switch is connected with the alternating current bus, the input end of the standby switch of the dual-power supply change-over switch is connected with one end of an emergency load switch, and the other end of the emergency load switch is connected with the energy storage unit;
the two ends of the load switch are respectively connected with the output end of the dual-power switch and the load;
the terminal is used for controlling the operation of the whole system.
2. The system for switching energy storage units from grid to grid according to claim 1, wherein: the load comprises a primary load and a secondary load, and the load switch comprises a primary load switch and a secondary load switch; two ends of the primary load switch are respectively connected with the output end of the dual-power switch and the primary load; and two ends of the secondary load switch are respectively connected with the output end of the dual-power switch and the secondary load.
3. The system for switching energy storage units from grid to grid according to claim 1, wherein: the energy storage unit comprises a current transformer, an energy storage unit switch, an energy storage converter and a battery module formed by electric cores which are sequentially connected in series; the current transformer is connected with the alternating current bus, and the other end of the emergency load switch is connected with the energy storage converter.
4. A system for off-grid switching of energy storage units according to claim 3, wherein: the energy storage unit switch and the emergency load switch are molded case circuit breakers.
5. A system for off-grid switching of energy storage units according to claim 3, wherein: the system also comprises a grid-connected switch, wherein two ends of the grid-connected switch are respectively connected with the alternating current bus and the current transformer.
6. The energy storage unit off-grid switching system of claim 5, wherein: the grid-connected switch is a universal circuit breaker, and the universal circuit breaker is provided with a voltage-losing tripping device.
7. The system for switching energy storage units from grid to grid according to claim 1, wherein: the load switch is an external contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321188327.7U CN219592127U (en) | 2023-05-17 | 2023-05-17 | Energy storage unit's switching system that goes out of network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321188327.7U CN219592127U (en) | 2023-05-17 | 2023-05-17 | Energy storage unit's switching system that goes out of network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219592127U true CN219592127U (en) | 2023-08-25 |
Family
ID=87694847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321188327.7U Active CN219592127U (en) | 2023-05-17 | 2023-05-17 | Energy storage unit's switching system that goes out of network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219592127U (en) |
-
2023
- 2023-05-17 CN CN202321188327.7U patent/CN219592127U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107612051B (en) | AC/DC hybrid system based on dual-redundancy power electronic transformer | |
| CN102035249B (en) | Direct current power supply emergency system of transformer substation based on lithium iron battery | |
| CN104242338B (en) | A kind of transformer station's micro-grid system containing distributed power source and control method | |
| CN110224482B (en) | Independent power supply and charging system for electric ship main power supply and storage battery grouping | |
| CN111404186B (en) | Distribution transformer dynamic capacity-increasing intelligent energy storage device and control method | |
| CN109742809B (en) | Multi-source complementary energy storage type power station security power supply system and control method thereof | |
| CN109406936B (en) | Alarm protection module for charging pile | |
| CN109256849B (en) | Hotel power distribution system provided with diesel generator and application method thereof | |
| CN206575222U (en) | Waste-to-energy plant low pressure emergency security power system | |
| WO2023093172A1 (en) | Energy control system of direct current networking ship hybrid power laboratory and control method therefor | |
| CN110752615B (en) | On-site joint debugging device and method for battery energy storage power station | |
| CN108400650A (en) | Power of alterating and direct current integral system | |
| CN206712539U (en) | A kind of marine low-pressure continuous-current plant based on the autonomous management of multiple batteries | |
| CN101728835A (en) | Battery power energy storing device for smoothing output power of wind power generation | |
| CN118017601A (en) | Method for increasing load capacity of power grid incoming line breaker | |
| CN219592127U (en) | Energy storage unit's switching system that goes out of network | |
| CN111082421A (en) | AC/DC micro-grid system based on energy router and protection method thereof | |
| CN110783915A (en) | Multi-distribution-platform-area power supply method and power supply system | |
| CN103904776A (en) | Intelligent power distribution room power system | |
| CN116760085A (en) | Energy storage unit grid-connected and off-grid switching system and discharging method thereof | |
| CN210273512U (en) | Micro-grid control system | |
| CN113253124A (en) | Safe and energy-saving power storage battery nuclear capacity discharging device and method | |
| CN109327064B (en) | Charging pile group current distribution system | |
| CN112713603A (en) | Intelligent power supply equipment on low-voltage side of power grid area | |
| CN112952796A (en) | Power utilization system wiring of offshore flexible direct current converter station and operation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |