Grid Scale
INTRODUCTION TO GRID SCALE ENERGY STORAGE SYSTEM (GSESS):
Energy storage becomes relevant to optimize generation and consumption of energy at different points of time and also ensure uninterrupted & quality power supply. ESS is an application, wherein Energy generated at one time is used at another time.
While energy storage comes with different technologies, Battery Energy Storage System (BESS) is one technology that has been developed to store electric charge by using specially developed batteries. BESS has an advantage over other storage technologies as it has a small footprint, no restriction on geographical locations and ease of mobility.
BESS by utilizing Lithium Ion technology offers high energy and power densities that are suitable for utilizing at distribution transformer level.
BESS components are grouped according to function into battery components, components required for reliable system operation and grid connection components.
BATTERY MANAGEMENT SYSTEM (BMS):
The battery management system consists of the Battery Pack, which connects multiple cells to appropriate voltage and capacity. BMS protects cells from harmful operation, in terms of voltage, temperature and current, to achieve reliable and safe operations by balancing varying cell states-of-charge (SOCs) within a serial connection.
POWER CONVERSION SYSTEM (PCS):
Power Electronics can be grouped into a conversion unit, which converts power flow between the grid and battery and the required control and monitoring components.
ENERGY MANAGEMENT SYSTEM (EMS):
The EMS is responsible for system power flow control, management and distribution. System thermal management controls all functions related to heating, ventilation and air-conditioning of the containment system. EMS will mainly be required at large scale, Grid Support ESS with multi megawatt systems with multiple megawatt systems with multiple usages. In smaller systems, this could be part of PCS.
APPLICATIONS OF ESS:
ESS applications range from grid operators & utilities [reducing costs “Behind-The-Meter (BTM)”] to end users. Battery energy storage systems (BESS) have seen the widest range of uses, while others are used in specific applications.
GRID OPERATORS & UTILITIES - (POWER QUALITY)
- Power Reliability
- Peak Shaving and Load Leveling
- Electric energy time-shift (arbitrage)
- Electric supply capacity
- Regulation
- Spinning, non-spinning and supplemental reserves
- Voltage support
- Black start
- Load following/Ramping up of renewables
- Transmission upgrade deferral
- Transmission congestion relief
- Distribution upgrade deferral and voltage support
CUSTOMER (“BEHIND-THE-METER”) APPLICATIONS:
- Time-of-Use Bill Management
INCREASED SELF-CONSUMPTION/SELF-SUFFICIENCY FROM SOLAR PLUS STORAGE:
KEY BENEFITS OF ESS:
- Commercial and Industrial Applications
- Grid Scale/ Utility Applications
- Arbitrage
- Firm Capacity or Peaking Capacity
- Operating Reserves and Ancillary Services
- Transmission and Distribution Upgrade Deferrals
- Black Start
TECHNICAL INFORMATION
| SOLAR INVERTER |
250KW |
| Nominal Battery Voltage |
360/480 |
| Out put No.of Phases |
3 Phase |
| Nominal Output Voltage & frequency |
400V, 50 Hz +/-2%,(+10%,-20% In Grid Synchronised mode |
| Voltage Regulation |
+/- 2% ( In stand alone mode) |
| Freq. Regulation in standalone mode |
0.5 Hz |
| THD |
<5% |
| Load Power factor |
0.8 lag to Unity |
| Efficiency Peak |
90% |
| Over load |
110%- 60 Sec, 125%-30 Sec, 150%-5 Sec |
| Auto By pass feature |
Provided |
| Parallel operation with Grid/DG |
Provided |
| Grid Synchronisation |
Provided |
| Grid Charging |
Enable/ Disable/ User settable |
| Power export to Grid facility |
Enable/ Disable/ User settable |
| SOLAR CHARGE CONTROLLER |
|
| Charge Controller type |
MPPT |
| Charger Topology |
Buck type |
| PV Nominal capacity total in KW |
Same as Inverter rating |
| No. of MPPT Channels |
1 |
| Max. Open Circuit Voltage (OCV) |
620/750 |
| MPPT Upper range |
515/623 |
| MPPT Lower range |
330/495 |
| Battery Type supported |
VRLA/LMLA / LITHIUM / NICAD/ FLOW BATTERIES |
| Peak Charging efficiency |
≥ 94% |
| GRID CHARGER |
|
| Grid Voltage Range (volt. Sync. Range) |
+10% & -20 % VAC |
| Grid Freq. Range( Freq. Sync. Range) |
+5% & -5% Hz |
| Max. Grid Import power |
As per Inverter Rating |
| Peak charging Efficiency |
Upto 85% |
| PROTECTION |
|
| PV Side |
Reverse Polarity, Surge Protection ( class D) |
| Battery Side |
Reverse polarity, Over/Under Voltage, Current Limit |
| Grid Side |
Over/Under Voltage, Over/Under Frequency, Surge Protection –D |
| Load Side |
Over load, Short circuit |
| System Protection |
Over Temperature, Emergency Stop. |
| USER INTERFACE |
|
| Display Interface |
Graphical LCD with back lit (128 x 64) |
| Setting input |
Membrane Keypad for setting inputs |
| Battery Paramters |
Voltage, Current, Cumulative Import Energy |
| PV Parameters |
Voltage, MPPT charger output Amps, Power, Energy cumulative |
| Grid Paratmeters |
Phase voltage, Frequency, Power factor, Reactive Power |
| Load Parameters |
Phase voltage/ current, Frequency, Power, Power Factor, Avg. |
| System Level Parameters |
Mode of operation, active faults, Heat sink, IGBT Temperature |
| LED Indicators |
Mains ON, Alarm. Buzzer mute |
| MONITORING |
| RS 485 Based monitoring showing all parameters through MODBUS |
| Easy to connect GPRS based Xenius module for remote monitoring of all parameters , ( 5 years data charge + SIM included for 3 phase) as well as remote controlling. |
| Data logging in micro SD card, All parameters can be logged in Micro SD card as per date & time. Logged parameters can be viewed / saved through Laptop / PC |
| OTHERS |
|
| Degree of Protection |
IP 21 |
| Cooling method |
Temperature controlled forced cooling |
| Operating Temperature |
0-55 Deg.c without derating. |
| Humidity |
Max. 95 % Non condensing |
| Altitude |
1000 M above sea level |
| Housing |
Floor Stand by – Tower type |
| Cable entry |
From Rear bottom |
|
IEC 62116, IEC 61727, IEC 61683, IEC 60068 ( 1,2, 14, 30), EN 50530 |
| 240 KWh Battery |
| S.No |
Description |
Battery Details |
| 01 |
Battery Rating |
480V-500AH |
| 02 |
Chemistry, Type |
Lithium iron phosphate(LFP); Prismatic |
| 03 |
Model |
LFP 480V-500 |
| 04 |
Total Energy(KWh) |
240 |
| 05 |
Module Rating |
48V-100 Ah |
| 06 |
Charging Voltage |
547 Volt |
| 07 |
Standard Charge/Discharge Current |
100 Amps / 100 Amps |
| 08 |
Battery End Voltage |
375 Volt |
| 09 |
Protection Function |
Over Voltage, Under Voltage, Short Circuit, Over Temperature |
| 10 |
Operating Temperature range/Charge/Discharge/Storage |
-/0°C to 45°C/-20°C to +60°C/-20°C to +25°C |
| 11 |
Humidity |
5%≤RH≤85% |
| 12 |
Expected Cycle Life @ 80 % DOD |
>2000 Cycles (at 20-25°C) |
| 13 |
Module Dimensions |
480 x 350 x 222 ( W x D x H) |
| 14 |
Rack Dimensions |
650 x 500 x 1680 ( W x D x H) |
| 15 |
No.of Modules / Rack |
5 |
| 16 |
No.of Racks / System |
10 |
| 17 |
Module weight / System weight |
~60 Kgs / 3825 Kgs |
| 480 KWh Battery |
| S.No |
Description |
Battery Details |
| 01 |
Battery Rating |
480V-1000AH |
| 02 |
Chemistry, Type |
Lithium iron phosphate(LFP); Prismatic |
| 03 |
Model |
LFP 480V-1000 |
| 04 |
Total Energy(KWh) |
480 |
| 05 |
Module capacity |
48V-100Ah |
| 06 |
Charging Voltage |
547 Volt |
| 07 |
Standard Charge/Discharge Current |
200 Amps |
| 08 |
Battery End Voltage |
375 Volt |
| 09 |
Protection Function |
Over/ Under Voltage, Short Circuit, Over Temperature |
| 10 |
Operating Temperature range/Charge/Discharge/Storage |
-/0°C to 45°C/-20°C to +60°C/-20°C to +25°C |
| 11 |
Humidity |
5%≤RH≤85% |
| 12 |
Expected Cycle Life @ 80 % DOD |
>2000 Cycles (at 20-25°C) |
| 13 |
Module Dimensions |
480 x 350 x 222 ( W x D x H) |
| 14 |
Rack Dimensions |
650 x 500 x 1680 ( W x D x H) |
| 15 |
No.of Modules / Rack |
5 |
| 16 |
No.of Racks / System |
20 |
| 17 |
Module weight / System weight |
60 Kgs / 7000 Kgs |
| 1 MWh Battery |
| S.No |
Description |
Battery Details |
| 01 |
Battery Rating |
720V-1400AH |
| 02 |
Chemistry, Type |
Lithium iron phosphate(LFP); Prismatic |
| 03 |
Model |
LFP 720V-1400 |
| 04 |
Total Energy(KWh) |
1008 |
| 05 |
Module Rating |
48V-100Ah |
| 06 |
Charging Voltage |
821 Volt |
| 07 |
Standard Charge/Discharge Current |
280 Amps / 280 Amps |
| 08 |
Battery End Voltage |
562 Volt |
| 09 |
Protection Function |
Over/, Under Voltage, Short Circuit, Over Temperature |
| 10 |
Operating Temperature range/Charge/Discharge/Storage |
-/0°C to 45°C/-20°C to +60°C/-20°C to +25°C |
| 11 |
Humidity |
5%≤RH≤85% |
| 12 |
Expected Cycle Life @ 80 % DOD |
>2000 Cycles (at 20-25°C) |
| 13 |
Module Dimensions |
480 x 350 x 222 (W x D x H) |
| 14 |
Rack Dimensions |
650 x 500 x 1680 (W x D x H) |
| 15 |
No.of Modules / Rack |
5 |
| 16 |
No.of Racks / System |
42 |
| 17 |
Module weight / System weight |
~60 Kgs / 28000 Kgs |
