Solar String Inverters (output power up 200kVA)

The string inverter is connected to multiple strings of solar panels under similar sunlight and shading conditions.

Below is a block diagram of a Solar String Inverter where electromagnetic components are key for the overall dimensions, cost, and efficiency.

DC Inductors in the DC/DC MPPT Converter Block are needed as energy storage inductors for the step-up converter. AC Output Inductors and 3 Phase Output Chokes are present in the DC/AC Inverter block to filter high frequencies and to permit a clean 50/60Hz output voltage for the grid. The magnetic components should be suitable to operate between 8kHz and 25kHz switching frequency.

PRODUCTS

DC INDUCTOR

T32W01

Features

L = 0.28mH
Rated Current = 40A
DCR = 0.025 mOhm @@25C
Litz Wire conductor (720 strands x 0.1mmØ MW 82)
Ferrite Material core with multigap construction

AC OUTPUT INDUCTOR

BC4W01

Features

L = 0.13mH
Rated Current = 150A
Copper edge wound conductor MW 36 (4 x 12mm x 0.8mm)
4 wires are wound in parallel to reduce ACR increasing total available skin depth
Fe Si Alloy Powder Core

3 PHASE OUTPUT CHOKE

BS8W01

Features

L = 0.040mH
Rated Current = 140A
DCR = 0.950mOhm @@25C
Copper Edge Wound conductor MW 36 (12mm x 4mm)
Fe Si Alloy Powder Core

FALCO ELECTRONICS