How do inverters help limit harmonic distortion in power systems?

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Inverters shape their output by rapidly switching on and off, so the chopped waveform inherently contains harmonics. The way you control that switching and what you attach to the output determine how much of those harmonics end up in the power system. By using modulation strategies that produce a near-sinusoidal output (like sinusoidal PWM or selective harmonic elimination) and by keeping the switching frequency high, most harmonic energy is pushed toward frequencies that are easier to filter. Pairing this with proper output filters (LC low-pass filters or multi-pulse configurations) attenuates the remaining switching-frequency harmonics before they reach the grid or loads. So, with correct switching techniques and filtering, inverters can greatly limit harmonic distortion. The other options miss the mechanical cause and cure: harmonics come from switching, not simply from lower power or higher voltage, and inverters do affect harmonic content when designed properly.