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rockman7892
Electrical
- Apr 7, 2008
- 1,159
I'm looking at the feasibility to meet a customer requirement of 4MWH BESS for a new microgrid project. Customer is looking to scale BESS system from 1MWH to 4MWH over several years.
The conceptual solution discussed at this point is to provide (4) 1MWH units that can be connected together to meet the 4MWH requirement. These BESS unit inverters will output at 480V and then go through step-up transformer to 15kV for distribution system.
A couple of questions come to mind here that I was hoping someone may be able to shed some light on:
1) Does a BESS inverter always require an insolation transformer when connecting to system/grid? What is the main function provided by isolation transformer?
2) Is 1MWH the largest (or perhaps most economical) BESS on the market currently?
3) In a case with having multiple 1MWH BESS units connected together to achieve 4MHW capacity would this typically be (4) battery units systems and (4) inverters, or is there a potential for (4) 1MWH battery units connected through a common inverter? In the case with (4) separate inverters would each inverter typically have its own controller which communicates with the others?
4) If using (4) battery units and (4) inverters with each inverter having an isolation transformer what is the most efficient way to combine outputs of isolation transformers? Is it to daisy chain transformer outputs (IE feed-through transformers)with single connection to 480V SWBD, or is it more practical to have each isolation transformer feed separately into 480V SWBD ( separate feeders) with the outputs then combined in the SWBD?
The conceptual solution discussed at this point is to provide (4) 1MWH units that can be connected together to meet the 4MWH requirement. These BESS unit inverters will output at 480V and then go through step-up transformer to 15kV for distribution system.
A couple of questions come to mind here that I was hoping someone may be able to shed some light on:
1) Does a BESS inverter always require an insolation transformer when connecting to system/grid? What is the main function provided by isolation transformer?
2) Is 1MWH the largest (or perhaps most economical) BESS on the market currently?
3) In a case with having multiple 1MWH BESS units connected together to achieve 4MHW capacity would this typically be (4) battery units systems and (4) inverters, or is there a potential for (4) 1MWH battery units connected through a common inverter? In the case with (4) separate inverters would each inverter typically have its own controller which communicates with the others?
4) If using (4) battery units and (4) inverters with each inverter having an isolation transformer what is the most efficient way to combine outputs of isolation transformers? Is it to daisy chain transformer outputs (IE feed-through transformers)with single connection to 480V SWBD, or is it more practical to have each isolation transformer feed separately into 480V SWBD ( separate feeders) with the outputs then combined in the SWBD?
