Design a clamp based active filter for the single stage voltage boost small power grid-connected system

Abstract

Generally, two-stage voltage conversion is preferred for low-voltage DC sources such as PV (photovoltaic) modules, fuel cells, batteries, and super-capacitors however it is not suitable for the small power grid-connected system due to the cost and size. This work considers a single-stage, voltage level enhancement technique with a modified existing system. However, due to the clipped waveform, its output contains low-order harmonics. We design and implement an active filter, based on a clamper circuit to eliminate this clipped waveform. This filter has two tasks. First, detect the lower order harmonics then generate and add friendly harmonics. In our terminology, friendly harmonics are opposite in polarity with the low-frequency harmonics and the same polarity with the fundamental frequency. To prove the novelty, a comparative analysis with the existing strategy is also explained here. We also attempt to depict at least a 0.8% addition reduction in total harmonic distortion by comparing it with another methodology.

Keywords

• Filter
• Inverter
• Multi level inverter
• Over-modulation
• Total harmonic distortion

References

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