remove the lower harmonic orders from output of 11 level inverter

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remove the lower harmonic orders from output of 11 level inverter

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To remove the lower harmonic orders from the output of an 11-level inverter, selective harmonic elimination techniques can be employed. These methods focus on eliminating specific low-order harmonics (such as 3rd, 5th, and 7th) while maintaining the fundamental component at the desired magnitude.

One common approach involves using optimized Pulse Width Modulation (PWM) strategies, such as Selective Harmonic Elimination PWM (SHEPWM). This technique calculates the switching angles for the inverter's power devices in a way that cancels out targeted harmonics mathematically. By solving a set of nonlinear equations derived from Fourier analysis, the inverter can suppress unwanted low-order harmonics while generating a near-sinusoidal output waveform.

Another method is Space Vector PWM (SVPWM), which can be adapted to multilevel inverters to improve harmonic performance. By carefully selecting voltage vectors and dwell times, it is possible to minimize lower-order harmonics in the output.

Additionally, advanced modulation techniques like Nearest Level Modulation (NLM) or optimized staircase modulation can be used to naturally reduce low-order harmonics by increasing the number of voltage steps in the output waveform.

The choice of method depends on computational complexity, real-time implementation feasibility, and the desired harmonic profile. Most approaches require offline optimization or real-time processing to ensure accurate harmonic elimination.