Compensation Strategy to Eliminate the Effect of Current Measurement Offsets in Grid-Connected Inverters

Chang-Hee Lee; Jong-Woo Choi

Compensation Strategy to Eliminate the Effect of Current Measurement Offsets in Grid-Connected Inverters

Chang-Hee Lee

Jong-Woo Choi

Vol. 14, No. 2, pp. 383-391, Mar. 2014

10.6113/JPE.2014.14.2.383

Grid-connected inverter

Power quality

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Abstract

For the digital control of systems such as grid-connected inverters, measuring inverter output currents accurately is essential. However, current measurement offsets are inevitably generated by current measurement paths and cause DC current components in real inverter output currents. Real inverter output currents with DC components cause the DC-link capacitor voltage to oscillate at the frequency of a utility voltage. For these reasons, current measurement offsets deteriorate the overall system performance. A compensation strategy to eliminate the effect of current measurement offsets in grid-connected inverters is proposed in this study. The validity of the proposed compensation strategy is verified through simulations and experiments. Results show that the proposed compensation strategy improves the performance of grid-connected inverters.

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Cite this article

[IEEE Style]

C. Lee and J. Choi, "Compensation Strategy to Eliminate the Effect of Current Measurement Offsets in Grid-Connected Inverters," Journal of Power Electronics, vol. 14, no. 2, pp. 383-391, 2014. DOI: 10.6113/JPE.2014.14.2.383.

[ACM Style]

Chang-Hee Lee and Jong-Woo Choi. 2014. Compensation Strategy to Eliminate the Effect of Current Measurement Offsets in Grid-Connected Inverters. Journal of Power Electronics, 14, 2, (2014), 383-391. DOI: 10.6113/JPE.2014.14.2.383.