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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes, grid-intertied inverters are limited by law to something like 5% distortion. I once built one and it is not a project for a beginner.
I believe many modern appliances will run happily off DC. I also know that audio-visual equipment doesn't like a modified sine wave, because the sharp edges couple high-frequency noise into the audio and video wiring.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
I don't see how multiple coils leads to a simpler circuit. Having been involved in the design of a 300kW 3 phase sinusoidal inverter I would say the hardware is already relatively simple: a full bridge followed by an LC filter (3 phase in my case). The software to drive the bridge is a little more complex, especially if you want a clean sine output. You need to account for the transfer function of the bridge and filter (one is digital , one is analogue). We also found that changing from a linear interpolation of our sine lookup table to a second order polynomial (parabolic) got our harmonic distortion under 1%. I still remember the diagram of the control loop - it covered the entire whiteboard!
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Motionless Passive Generator. What do you think?
