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Product overview
The battery energy storage system is a technology that uses lithium batteries as a medium to store electrical energy and release electrical energy when needed. Battery energy storage is not affected by geographical conditions and can be flexibly applied to various links in the power system and other scenarios. The technology is mature and the energy conversion efficiency is high, which can produce significant economic and social benefits.
Technical Requirements
1. Standard for Electrical Design of Civil Buildings GB 551348-2019
2. General Code for Electrical and Intelligent Building (GB 55024-2022)
3. Safety Regulations for Electrochemical Energy Storage Power Station (GB/T 42288-2022)
4. Technical Specification for Monitoring System of Electrochemical Energy Storage Power Station (GB/T 42726-2023)
5. Code for Design of Power Supply and Distribution System GB 50052-2009
Industry and commerce is short for industry and commerce. Industry includes chemical plants, manufacturing plants, steel plants, machinery plants, textile mills, etc.; commerce includes shopping malls, hotels, office buildings, supermarkets, commercial residences, etc.
At present, the power grid has coal-fired power generation, wind power generation, photovoltaic power generation, long-distance transmission power supply, etc., to form a public power grid. However, due to photovoltaic power generation, it generates electricity during the day, does not generate electricity at night, does not generate electricity with the sun, does not generate electricity without the sun; wind power generation generates electricity without wind, and a variety of uncontrollable factors cause the instability of new energy power generation. The biggest problem is that the entire power grid is unstable, which can easily cause the power grid to be paralyzed at any time. In addition, the factory starts during the day, the electricity load increases, the night rest, the electricity load is reduced, more increased the instability of the power grid, so the state introduced a time-sharing electricity price mechanism and policy to encourage support, requiring everyone to cut the peak to fill the valley. The excess power of the power grid at night valley is stored, and at the same time of public power consumption at the peak of the day, the energy storage power supply is used to realize peak cutting and valley filling, so as to solve the problems of insufficient power during the day, no one at night and unstable power generation of new energy.
Product working principle
1, State Grid Anhui Electric Power Co., Ltd. agent to purchase electricity industrial and commercial users electricity price table.
2. Operation mode:
During the low electricity price periods of 1-6 and 9-12 months of each year: 23:00-8:00 and 12:00-17:00 at valley hours, power supply is provided through transformers to ensure the power supply of important loads on the one hand, and the converter charges the battery pack in the energy storage container to store electric energy through PWM technology at the same time. At ordinary times, the converter will automatically enter a dormant state during the electricity price periods of 8:00-9:00-9:00 and 22:00: 00: 00-23:00: 00: 00: 00 and 17:00-22:00 high electricity price period, the converter through SPWM active tracking technology, the release of the battery pack stored electrical energy, reduce the peak-time high-priced electrical energy, to achieve peak filling.
During the low electricity price period from 00:00:00 to 9:00 in July and August of each year, power is supplied through transformers, which on the one hand ensures the power supply of important loads in the factory area, and at the same time, the converter charges the battery pack and stores electric energy through PWM technology. During the normal 9:00-16:00 flat electricity price period, power is supplied through transformers, which on the one hand ensures the power supply of important equipment and the converter automatically enters a dormant state, through SPWM active tracking technology, the converter releases the electric energy stored in the battery pack, reduces the peak-time high-priced electric energy, and achieves peak cutting and valley filling.
3, Anhui Province time-sharing electricity price distribution.
According to the industrial and commercial electricity price policy of Anhui State Grid (shown in the figure below), the peak electricity price from January to June and September to December will be implemented from 8: 00 a.m. to 12: 00 a.m. for 3 hours and from 17: 00 p.m. to 22: 00 p.m. for 5 hours. From July to August, the peak electricity price will be implemented from 16: 00 p.m. to 24: 00 p.m;
Diagram of time-of-use electricity price from January to December
Technical parameters
DC side |
Maximum DC voltage |
1500V |
Minimum DC voltage |
580V |
|
DC voltage operating range |
580～1300V（@50℃） 580～1500V（@35℃） |
|
Maximum DC operating current |
100A——2000A |
|
AC side grid connection |
AC output power |
50kVA——1500kVA |
Rated AC voltage |
400V |
|
AC voltage range |
360～440V |
|
Rated grid frequency |
50HZ |
|
Grid frequency range |
45～55HZ |
|
AC current harmonics |
<3% (at rated power) |
|
AC current DC component |
＜0.5% ln |
|
Power factor at rated power |
＞0.99 |
|
Adjustable range of reactive power |
-100%～100% |
|
Communication off network |
Rated AC voltage |
400V±3% |
AC voltage harmonics |
<3% (linear load) |
|
Rated grid frequency |
50HZ/ |
|
Grid frequency range |
45～55HZ |
|
Efficiency |
Maximum efficiency |
98.6% |
Protect |
Reverse protection |
have |
DC switch |
have |
|
AC switch |
have |
|
Surge protection |
DC Type Ⅱ/AC Type Ⅱ |
|
Power grid monitoring/ground fault detection |
have/have |
|
Insulation testing |
have |
|
Overheat protection |
have |
|
Protection level |
IP65 |
|
Working temperature range |
-25~+60 ℃ (>50 ℃ for derating operation) |
|
Relative humidity range (non condensing) |
0～100% |
|
Cooling method |
Intelligent forced air cooling |
|
Maximum working altitude |
4000m (>3000m Derating) |
|
display |
LED |
|
communication |
RS485/CAN |
|
Communication protocol |
Modbus-RTU/Moodbus-TCP,CAN2.0B |
|
Compliant with standards |
CE,IEC 62477,IEC 61000 |
|
Power grid support |
L/HVRT, active and reactive power control |
Model specifications
The company's product specifications and models are complete, which can meet the user's various specifications and power design requirements. The following specifications and dimensions are for reference only. Please consult customer service personnel for customized models and specifications.
Model |
20ft (PCS included) |
40ft (PCS included) |
DC side DC |
||
Rated voltage |
652.8V |
652.8V |
Rated capacity |
1800Ah |
3600Ah |
Rated power |
1175.04kWh |
2350.08kWh |
AC side DC |
||
Rated power |
250kW |
500kW |
Maximum power |
275kW |
550kW |
Rated current/maximum current |
360A/396A |
721A/793A |
Rated voltage |
400V (3W+N, three-phase four wire system) |
400V (3W+N, three-phase four wire system) |
Rated frequency |
50Hz |
50Hz |
Basic parameters |
||
Protection level |
IP54 |
IP54 |
Temperature control system |
Industrial air conditioning |
Industrial air conditioning |
Fire protection system |
Heptafluoropropane fire extinguishing system |
Heptafluoropropane fire extinguishing system |
Allow altitude |
≤3000m |
≤3000m |
Outer dimensions of containers |
6058 mm x 2438 |
12192 mm x 2438 |
length, width and height |
mm x 2591 mm |
mm x 2591 mm |
Communication methods |
RS485、Ethernet、4G |
RS485、Ethernet、4G |
Note: For small storage below 100kw, medium storage 100-1000kw and large storage above 1000kw, industrial and commercial energy storage systems of the same specification and size can be selected as required.
Technical features
1. Running status
Charging state: The grid injects DC current from the AC bus to the battery system through the PCS, and the battery stores energy; in this state, the system accepts background power scheduling.
Discharge state: The battery injects current from the battery system to the AC bus through the PCS, and the battery releases energy; in this state, the system accepts background power scheduling.
Static state: There is no energy exchange between the grid and the battery, the PCS is in standby condition, and the battery is in a static state.
Fault state: A fault occurs in a certain position of the system, and energy cannot be exchanged between the power grid and the battery. After a serious fault occurs, it must be restored by manual operation. In this state, the system does not accept background power scheduling. Maintenance status: when the battery is undergoing regular maintenance, troubleshooting or replacement, it can be manually marked as the maintenance status without affecting the continuous operation of the system load; In this state, the system does not accept background power scheduling.
DC automatic grid-connected state: the control terminal is mobilized to automatically detect the pressure difference value of each cluster battery pack, control PCS to discharge or charge, realize the voltage balance between multiple cluster battery packs, and enter the ready static state after the balance is completed; In this state, the system does not accept background power scheduling.
2. Charge and discharge
The energy storage system receives the scheduling policy, solidifies the policy in the scheduling control terminal, and starts the charging state or the discharging state according to the current policy when no new scheduling policy is received. Under normal circumstances, the charging and discharging interval of the battery is between 10% and 90% capacity, and the system will default to the blocking parameters of charging and discharging to avoid the problem of battery heating caused by overcharging and the problem of battery life reduction caused by overdischarging.
3. Standby
When the energy storage system enters the ready rest state, the energy storage bidirectional converter and the battery management system can be set to the standby state to reduce power consumption. The protection function in the standby state is still valid, and the connection to the cloud platform is still valid.
4. DC grid connection of battery string
The energy storage system can be extended to support up to 12 cluster battery packs. Due to the extremely small internal resistance of the battery string, when the energy storage system is left standing for a long time or a battery string is re-put into operation after maintenance, the voltage difference between the battery strings will lead to the formation of circulation between the cluster battery packs when the grid is connected. A complete control strategy can be provided to control this circulation within the tolerance of the system.
The dispatching control terminal of the energy storage system provides a perfect DC grid-connected logic control function. When the above situation occurs, the cluster battery pack with excessive pressure difference will be prevented from being directly connected to the grid by blocking the relevant contactor. The user can enter the DC automatic grid-connected state by starting, and the system automatically completes the grid-connection of all effective cluster battery packs without manual intervention.
5. Off-grid operation
When the energy storage system encounters a short-term power loss on the AC side of the power grid, it will turn off the PCS module to reduce power consumption, and will maintain the dispatch control terminal, battery management system and other subsystems to continue to work for a period of time. If the power grid loses power for a long time, the dispatching control terminal, battery management system and other subsystems will be closed, and only the data connection between the energy storage system and the cloud will be maintained.
6. Emergency shutdown
The energy storage system supports manual emergency shutdown operation, and forcibly shuts down the system operation by triggering the shutdown signal of local or remote access.
7. Overflow trip
When the energy storage system detects a serious fault, it will automatically disconnect the circuit breaker inside the PCS to isolate the power grid. If the circuit breaker fails to operate, the system will output an overflow trip signal to trip the previous circuit breaker to isolate the fault.
8. Fire protection system
The energy storage system will start the fire fighting system when the detection temperature exceeds the warning value or the smoke sensing signal action, and at the same time reduce the oxygen concentration content and isolate the flame propagation. When the fire alarm signal is triggered, the system will stop the emergency, disconnect the connection with the grid, disconnect the cluster battery.
Selection scheme
Number |
Specifications |
Remarks |
1 |
500kW/1MWh |
Can be used for 6-10 AC charging stations and 4-5 DC charging stations |
2 |
1MW/2MWh |
Can be used for 10-15 AC charging stations, 5-10 DC charging stations |
3 |
1.5MW/3MWh |
Can be used for 15-20 AC charging stations, 10-15 DC charging stations |
4 |
2MW/4MWh |
Can be used for 20-30 AC charging stations, 15-20 DC charging stations |
Product Picture
Energy storage charging system
AC/DC charging pile
Outline drawing of energy storage container
Energy storage system diagram
Service Telephone
Telephone:0551-65317588,65323322
Fax: 0551-65313339
E-mail:hflx88@163.com
Address:No.61, Yulan Avenue, High-tech Zone, Hefei City
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Copyright Information: Hefei Lianxin Power Supply Co., Ltd.