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LC filter issues in inverter

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mathespbe

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Hi power electronics experts,

We have designed a solar inverter of 10KW capacity. We had 3 single phase inverter in which each phase carries 3500W capacity. We have loaded and tested the system fine and which has no issues. In order to filter the waveform we have introduced LC filter.

Input DC supply to inverter 275-350VDC
Output AC 200-240VAC
Switching frequency of inverter is 9KHz.
Inductor value is 0.4mH/60A
Capacitor value is 3.15uF/880V

The issue we are facing is when we load the inverter with LC connected, it works fine upto 2500W on a single phase. When i try to load it above that (3000W) there is a spurious spike present at the one half of AC output and the core if inductor is making vibration and heat.

I guess inductor is not saturating since it has much higher current rating than actual load current.

The attachment is the waveforms which has the spurious spikes.

View attachment 3000W LC_4.bmpView attachment 3000W LC_5.bmp
 
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