High pressure grade Federal Reserve energy converter
The topology of the high voltage cascaded energy storage system consists of grid-connected reactor, cascaded power unit, battery module, and corresponding control and protection equipment.
Generation-side energy storage: load regulation, smoothing intermittent energy, increasing consumption of new energy, increasing reserve capacity of power grid, participating in peak regulation and frequency modulation.
Transmission and distribution energy storage: improve power quality, reduce line loss, improve the reserve capacity of the grid, improve the utilization efficiency of transmission and distribution equipment, and delay the demand for capacity increase.
User-side energy storage: smooth load curve, load transfer, peak clipping and valley filling.
Emergency power supply system: it is in standby state when the power grid is normal, and it can be started when the power grid is faulty to guarantee the continuous power supply of the load.
Fire power supply, emergency lighting, energy feedback, etc.
(1) Frequency modulation application of energy storage power station
The AC output terminal of the frequency modulation device of the energy storage power station is connected with the on-site power grid (the generator output terminal of the microgrid) to detect the load power of the power grid in real time.When a load surges, released from the super capacitor energy, provide load power support, when the sharp reduction in load to the super capacitor charging and restrain voltage overshoot, the device for the local power grid have played an important role "the peak", greatly improving the local power grid of temporary power system security, reliability, has a fast response, energy saving and environmental protection.The control block diagram of the device is shown in the figure.
Control diagram of frequency modulation device in energy storage power station
Main advantages:
(1) Fast judgment algorithm of sudden increase and decrease of load power.Based on instantaneous reactive power theory, the fast judgment algorithm of load power sudden increase and sudden decrease can be used to accurately and quickly identify power sudden change events within any set time (within 1000ms).
(2) Perfect and thorough compensation strategy for load power mutation.The device can identify the load conditions in real time and accurately. According to the change of the load conditions, it can automatically complete the single power sudden increase and sudden decrease compensation, continuous power sudden change, sudden decrease and various random combination power sudden change compensation, so as to minimize the impact caused by the load sudden change to the power grid.
(3) Excellent grid-connection indicators.The DC/AC main circuit adopts three level topology, the output voltage is five step wave, and the harmonics of grid-connected current is less than 3%.
(4) one machine multi-purpose.At the same time, it has the function of reactive power compensation and off-grid mode, which can be used as the standby power supply when the local power grid fails.
(2) Application of peak regulation in energy storage power stations
With the rapid development of China's economy, there is a large peak-valley difference in many regional power grids, and the capacity of peak regulation is insufficient.Large loss and low utilization rate of transmission and transformation equipment;Power grid peak summer pressure is large, power supply is insufficient;Large-scale renewable energy grid connection, absorbing difficulties and other issues.Large-scale energy storage devices can solve the problems of "the time difference between generation and consumption" and "the impact of intermittent renewable energy power generation directly connected to the grid on the power grid" and play a role in regulating the power quality.For example, "grain power" is stored in energy storage batteries and released during peak periods for use in production and operation, which can not only reduce the burden on the power grid, but also reduce operating costs and play the role of peak load reduction and valley filling.
Technical parameters
The rated voltage
6 kv ~ 35 kv plus or minus 10%
Rated frequency
50Hz
Working frequency
48 ~ 50.5 Hz
Rated power
2MW~100MW
Battery capacity
Configure according to the actual situation
topology
Cascaded H bridge
Current Harmonics (THDI)
< 3% (25% or higher P)
The response time
The < 10 ms
Charge and discharge switching time
<80ms
Overload capacity
1.1 times rated current 10min, 1.2 times rated current 1min
The power supply mode
Multi-channel power supply
Control the power
380VAC, 220VAC or 220VDC
Reactive power regulation
With the function of reactive power regulation
Communication interface
RS485, Ethernet
Communication agreement
Modbus_rtu, IEC 103/104
The operation mode
Active/reactive power independent control
Protection function
Short circuit protection, overcurrent protection, island protection, communication protection, AC side undervoltage/overvoltage protection, DC side overvoltage/undervoltage protection, cooling system fault protection, etc
Multimachine parallel
support
Redundant functions
support
Cooling way
Air conditioning (water-cooled)
installation
Indoor/outdoor containers
Storage temperature
- 25 ~ 45 ℃
Protection grade
Indoor IP20, outdoor IP54
The altitude
Within 1000 meters (customizable)
Overall dimensions
2 mw/MWH 2 (3 * 6.058 * 2.438 * 2.591)
The above size is for reference only. Please refer to the real object for details. For more specifications and sizes, please contact to confirm.
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