Abstract
This paper presents the DC offset compensation algorithm in the measured grid voltage of single-phase grid-connected inverter. When including the DC offset at the measured grid voltage, the estimated grid frequency and grid-side current might be distorted. In this paper, SRF-PLL is used to generate the grid angle information and the effects of the DC offset are analyzed in detailed. Due to the DC offset, the estimated phase angle includes the specific harmonic component which is the fundamental frequency of the grid frequency. As a result, in this paper, the measured grid voltage including the DC offset is compensated by using the synchronous reference frame with high pass filter and all pass filter. The experimental results are presented to demonstrate the effectiveness of the proposed algorithm.
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