CN220964338U - Electric power energy storage grid-connected system - Google Patents
Electric power energy storage grid-connected system Download PDFInfo
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- CN220964338U CN220964338U CN202322599292.2U CN202322599292U CN220964338U CN 220964338 U CN220964338 U CN 220964338U CN 202322599292 U CN202322599292 U CN 202322599292U CN 220964338 U CN220964338 U CN 220964338U
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Abstract
The utility model relates to the technical field of energy storage, in particular to an electric power energy storage grid-connected system which comprises a power distribution conveying line, a Hall current sensor, a transmitter, an energy storage device and a two-stage converter, wherein the Hall current sensor is connected in series on the power distribution conveying line, the signal output end of the Hall current sensor is connected with the signal input end of the energy storage device through the transmitter, the energy storage device is electrically connected with the two-stage converter, and the output end of the two-stage converter is connected into the power distribution conveying line. And the two-stage converter is adopted to realize energy storage grid-connected power generation according to the detected current signal, so that the supply and demand relationship of power generation, distribution and use is balanced, excessive power generation at the power grid side is avoided, a power supply gap of the power grid is relieved, and the utilization efficiency of power generation equipment is improved.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to an electric power energy storage grid-connected system.
Background
With the development of renewable energy sources and distributed technology, a large amount of renewable energy sources such as distributed power generation, energy storage and the like are fused with an electric power system, so that the demand of urban society on power supply and electric power can be met, the renewable energy sources are realized, the consumption of traditional energy fuel is reduced, and the method has important significance for propelling the sustainable development of future energy sources.
However, renewable energy sources have obvious instability and randomness, environmental conditions in different areas and seasons have great influence on the power generation capacity of new energy sources, the instability of the renewable energy sources is easy to generate fluctuation to influence a power system, and the grid-connected power supply quality is low. Through establishing the energy storage power station, can play isolation and buffering's effect between renewable energy and electric power system, the energy storage power station can store the surplus electric power when the electric power demand is low valley period to release when the power consumption peak period, reduce the electric energy waste. However, the energy storage power station is limited by the fluctuation of power supply of the battery and new energy power generation, so that good schedulability is difficult to realize, and reasonable management and control are needed when the energy storage power station and the power system are connected in a grid for generating power.
Disclosure of utility model
In order to solve the problems, the utility model provides an electric power energy storage grid-connected system.
The technical scheme is as follows:
The utility model provides an electric power energy storage grid-connected system, includes distribution transfer chain, hall current sensor, changer, energy memory and two-stage converter, hall current sensor establishes ties on distribution transfer chain, and its signal output part is connected with energy memory signal input part through the changer, energy memory is connected with two-stage converter electricity, the output of two-stage converter inserts in the distribution transfer chain.
The energy storage device comprises an energy storage battery pack, a battery management system, an energy storage converter and an energy management system, wherein the energy management system is respectively connected with the battery management system and the energy storage converter through RS485 communication lines, the battery management system is connected with the energy storage battery pack through a data transmission line, and the energy storage converter is electrically connected with the energy storage battery pack.
The energy storage inverter is externally connected with the photovoltaic power generation assembly and the wind power generation assembly.
In order to realize the remote monitoring of the energy storage device, the energy management system comprises a network communication module, and the network communication module can be in network interconnection with a remote monitoring platform.
In order to realize that the energy storage device can generate electricity and grid connection, the two-stage converter consists of a DC-DC converter and a DC-AC inverter.
As a specific implementation manner, the DC-DC converter adopts a bidirectional buck-boost circuit.
The type of the Hall current sensor is LTC1000-TF.
The power distribution transfer chain is provided with secondary and fuses the transformer, the power distribution transfer chain is through secondary and fuses the transformer and change 10kv high voltage signal into 380V low voltage signal, secondary and fuse transformer secondary side voltage output end and be connected to the load.
The secondary fusion transformer and the load are directly provided with a switch cabinet.
As a specific implementation mode, the energy storage device is further provided with a fireproof detection device and an emergency start-stop switch.
And a direct current protector is arranged between the two-stage converter and the energy storage device.
The beneficial effects are that: the utility model relates to an electric power energy storage grid-connected system, which detects the power consumption current state of a power grid load in real time through a Hall current sensor, an energy storage device adopts a two-stage converter to carry out voltage boosting and reducing and alternating current-direct current conversion according to a detected current signal, energy storage grid-connected power generation is realized, energy storage at the power grid side is beneficial to balancing the supply and demand relation of power generation, distribution and use, excessive power generation at the power grid side is avoided, a power supply gap of the power grid is relieved, the utilization efficiency of power generation equipment is improved, the construction investment of the power grid is reduced, and powerful guarantee is provided for safe and stable operation of the power grid system.
Drawings
FIG. 1 is a schematic diagram of a power storage grid-connected system;
Fig. 2 is a bidirectional buck-boost circuit diagram.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.
Examples
Referring to fig. 1, the embodiment provides an electric power energy storage grid-connected system, which comprises a power distribution transmission line, a hall current sensor, a transmitter, an energy storage device and a two-stage converter, wherein the hall current sensor is connected in series on the power distribution transmission line, the hall current sensor can measure three-phase alternating current on the power distribution transmission line through a hall effect, a signal output end of the hall current sensor is connected with a signal input end of the energy storage device through the transmitter, and a measured value of the hall current sensor can be converted into a standard electric signal by the transmitter and is transmitted to the energy storage device; the energy storage device is electrically connected with the two-stage converter, the output end of the two-stage converter is connected to the power distribution conveying line, and when the energy storage device is used for energy storage and power generation, the two-stage converter can be used for carrying out voltage rise and fall conversion and direct current-alternating current conversion, so that the stored electric energy of the energy storage device is collected into the power distribution conveying line for grid-connected power generation.
The power distribution conveying line is provided with a secondary fusion transformer, the power distribution conveying line converts a 10kv high-voltage signal into a 380V low-voltage signal through the secondary fusion transformer, a secondary side voltage output end of the secondary fusion transformer is connected with a load, a switch cabinet is installed between the secondary fusion transformer and the load and used for carrying out configuration distribution on the voltage of the transformer to a voltage level required by a user, a main control switch and a sub-control switch are arranged, power receiving equipment and power supply equipment at two ends of the power distribution conveying line are isolated, and accordingly the functions of opening and closing, controlling and protecting the electrical equipment are achieved.
The Hall current sensor is connected in series to the front end of the low-voltage load electricity utilization side of the power distribution conveying line, so that three-phase alternating current of the power distribution conveying line is measured. The Hall current sensor adopts the model LTC1000-TF, the potential generated by a Hall element of the Hall current sensor is in direct proportion to the current passing through the element, and when the measured current of the power distribution conveying line passes through a wire in the Hall current sensor, a magnetic field is generated, and the magnetic field acts on the Hall element to generate a potential signal and is converted into voltage output. The signal output end of the Hall current sensor transmits voltage to the transmitter for standard electric signal conversion and transmits the voltage to the energy storage device.
In particular embodiments, the energy storage device includes an energy storage battery pack, a battery management system, an energy storage converter, and an energy management system. The energy management system is connected with the battery management system and the energy storage converter through RS485 communication lines respectively, the battery management system is connected with the energy storage battery pack through a data transmission line, and the energy storage converter is electrically connected with the energy storage battery pack. The energy management system can determine the power utilization state of the power distribution conveying line according to the electric signals, when the power distribution conveying line is in a power utilization peak period, the Hall current sensor transmits detected current values to the energy management system through the transmitter, the energy management system detects that the standard electric signals are increased, a discharge signal is sent to the battery management system, and the battery management system controls the energy storage battery pack to discharge and exert power; meanwhile, the energy management system is connected with the battery management system, the battery management system can detect the voltage value of the current energy storage battery pack, when the energy storage battery pack is insufficient in electric energy, the energy management system charges the energy storage battery pack by controlling the energy storage converter, and the energy storage converter is externally connected with the photovoltaic power generation assembly and the wind power generation assembly and is used for charging the energy storage battery pack.
In order to realize that the energy storage device can generate electricity and grid connection, the energy storage battery pack is connected to a power distribution conveying line through the two-stage converter by means of electric energy generated by discharging. The two-stage converter consists of a DC-DC converter and a DC-AC inverter, the DC-DC converter converts the voltage of the energy storage battery pack into higher or lower voltage output by adopting a bidirectional buck-boost circuit, the energy management system can adjust the grid-connected power generation power of the energy storage device according to the detection current signal of the Hall current sensor, the voltage output of the energy storage battery pack is converted by the bidirectional buck-boost circuit through voltage boosting and boosting, then the DC-AC inverter is used for carrying out direct current-to-alternating current conversion, the alternating current required by a corresponding power distribution conveying line is output, and the alternating current is connected to the power distribution conveying line for grid connection to supplement the required electric energy in the power utilization peak period. Meanwhile, a direct current protector is arranged between the two-stage converter and the energy storage device and is used for protecting direct current voltage of the energy storage device. And the energy storage device is further provided with a fireproof detection device and an emergency start-stop switch, equipment faults caused by overheat of the energy storage device during grid-connected power generation or battery charging are prevented, the working state of the energy storage device is detected in real time through the fireproof detection device, and when the energy storage device has abnormal faults, power-off control is performed through the emergency start-stop switch, so that electrical equipment of the energy storage device is protected.
Claims (10)
1. The utility model provides a electric power energy storage grid-connected system, its characterized in that includes distribution transfer chain, hall current sensor, changer, energy memory and two-stage converter, hall current sensor establishes ties on distribution transfer chain, and its signal output part is connected with energy memory signal input part through the changer, energy memory is connected with two-stage converter electricity, the output of two-stage converter inserts in the distribution transfer chain.
2. The power energy storage grid-connected system according to claim 1, wherein the energy storage device comprises an energy storage battery pack, a battery management system, an energy storage converter and an energy management system, the energy management system is respectively connected with the battery management system and the energy storage converter through an RS485 communication line, the battery management system is connected with the energy storage battery pack through a data transmission line, and the energy storage converter is electrically connected with the energy storage battery pack.
3. The electrical energy storage grid-tie system of claim 2, wherein the energy management system comprises a network communication module.
4. The power storage grid-tie system of claim 1, wherein the two-stage converter is comprised of a DC-DC converter and a DC-AC inverter.
5. The power grid-tie system of claim 4, wherein the DC-DC converter employs a bi-directional buck-boost circuit.
6. The electrical energy storage grid tie system of claim 1, wherein the hall current sensor model is LTC1000-TF.
7. The power storage grid-tie system of claim 1, wherein the power distribution conveyor line is provided with a secondary fusion transformer, the power distribution conveyor line converts a 10kv high voltage signal to a 380V low voltage signal through the secondary fusion transformer, and a secondary side voltage output end of the secondary fusion transformer is connected to a load.
8. The electrical energy storage grid-tie system of claim 7, wherein a switch cabinet is installed between the secondary fusion transformer and the load.
9. The electrical energy storage grid tie system of claim 2, wherein the energy storage device is further provided with a fire detection device and an emergency start-stop switch.
10. The power storage grid-tie system of claim 4, wherein a dc protector is provided between the two-stage converter and the energy storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322599292.2U CN220964338U (en) | 2023-09-25 | 2023-09-25 | Electric power energy storage grid-connected system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322599292.2U CN220964338U (en) | 2023-09-25 | 2023-09-25 | Electric power energy storage grid-connected system |
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| Publication Number | Publication Date |
|---|---|
| CN220964338U true CN220964338U (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322599292.2U Active CN220964338U (en) | 2023-09-25 | 2023-09-25 | Electric power energy storage grid-connected system |
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| Country | Link |
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| CN (1) | CN220964338U (en) |
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2023
- 2023-09-25 CN CN202322599292.2U patent/CN220964338U/en active Active
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