Single-Phase Cascaded Inverter to Reduce Common Mode Current in Standalone PV System Using A Modified Phase-shifted Carrier-Based PWM

摘要

This paper presents a modified phase-shifted carrier-based pulse width modulation (SP-CBPWM) strategy to reduce common mode current of the single-phase cascaded multilevel inverters for standalone PV system applications. These techniques are modified from the modulation control technique of the conventional transformerless inverter topology that generates three voltage-levels with very small varying common- mode voltage which can reduce the common mode current in the single-phase PV system. The modified modulation method with two phase-shifted triangular carrier waves was developed to provide a five voltage-levels output waveform of the single-phase cascaded multilevel transformerless inverter with very small varying common-mode voltage also based on R-L test load. The results are verified the feasibility of the proposed technique by using the computer simulations.