2.5 MW generated with four identical stacks each having 3000 MFD DC cap and total AC cap are 12 NOS 3X49 MFD (delta connected). grid voltage is 650 V rms.
Dear Abhishek Parmar:
You can benefit from this online calculator:
@https://www.sensata.com/calculator/precharge
And these valuable Links about your topic:
@http://liionbms.com/php/precharge.php
@https://forums.aeva.asn.au/viewtopic.php?t=2602
I hope it will be helpful ..
Best wishes ..
Dear Hassan,
it is very helpful, yet i can't calculate AC cap inrush.
Dear Abhishek Parmar:
Please try these valuable Links:
@https://www.nepsi.com/resources/calculators/peak-inrush-current-from-capacitor-bank-switching.htm
@https://www.ametherm.com/blog/inrush-current/capacitor-inrush-current
@https://www.ametherm.com/blog/inrush-current/calculate-inrush-current-three-steps
@https://www.invbat.com/content/281m.html
Best wishes ...
The pre-charge resistor value and wattage for a three-level 2.5 MW NPC grid-tied solar inverter should be selected based on the following factors:
- The voltage of the DC link: The DC link voltage is the voltage at which the inverter operates. The pre-charge resistor value should be high enough to limit the current flowing into the DC link, but low enough to not cause a significant voltage drop.
- The current of the AC capacitors: The current of the AC capacitors is the current that flows through the AC capacitors when they are being charged. The pre-charge resistor wattage should be high enough to dissipate the heat generated by the current flowing through the resistor, but low enough to not cause a significant voltage drop.
- The desired pre-charge time: The pre-charge time is the time it takes for the DC link to reach its operating voltage. The pre-charge resistor value and wattage should be selected to ensure that the DC link reaches its operating voltage within the desired pre-charge time.
The following formulas can be used to calculate the pre-charge resistor value and wattage:
Pre-charge resistor value = (DC link voltage - AC capacitor voltage) / AC capacitor current Pre-charge resistor wattage = (Pre-charge resistor value * AC capacitor current) ^ 2
For example, if the DC link voltage is 1000 volts, the AC capacitor voltage is 500 volts, and the AC capacitor current is 2500 amps, then the pre-charge resistor value would be 2 ohms and the pre-charge resistor wattage would be 125,000 watts.
It is important to note that the pre-charge resistor value and wattage may need to be adjusted to account for other factors, such as the ambient temperature and the efficiency of the inverter. Here are some additional tips for selecting the pre-charge resistor value and wattage:
- It is important to use a high-quality pre-charge resistor. A high-quality pre-charge resistor will be able to withstand the high currents and voltages involved in the pre-charging process.
- It is important to install the pre-charge resistor in a safe location. The pre-charge resistor will generate heat during the pre-charging process, so it is important to install it in a location where the heat can be dissipated safely.
- It is important to monitor the pre-charge resistor during operation. The pre-charge resistor may fail over time, so it is important to monitor it for signs of failure.
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