Load Disturbance Compensation for Stand-alone Inverters Using an Inductor Current Observer

A control scheme for stand-alone inverters that utilizes an inductor current observer (ICO) is proposed. The proposed method measures disturbance load currents using a current sensor and it estimates the inductor current using the ICO. The filter parameter mismatch effect is analyzed to confirm the ICO’s controllability. The ICO and controllers are designed in a continuous-time domain and transferred to a discrete-time domain with a digital delay. Experimental results demonstrate the effectiveness of the ICO using a 5-kVA single-phase stand-alone inverter prototype. The experimental results demonstrate that the observed current matches the actual current and that the proposed method can archive a less than 2.4% total harmonic distortion (THD) sinusoidal output waveform under nonlinear load conditions.

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Cite this article

[IEEE Style]

J. Choe, S. Moon, B. Byen, J. Lai, Y. Lim, G. Choe, "Load Disturbance Compensation for Stand-alone Inverters Using an Inductor Current Observer," Journal of Power Electronics, vol. 17, no. 2, pp. 389-397, 2017. DOI: 10.6113/JPE.2019.17.2.389.

[ACM Style]

Jung-Muk Choe, Seungryul Moon, Byeng-Joo Byen, Jih-Sheng Lai, Young-Bae Lim, and Gyu-Ha Choe. 2017. Load Disturbance Compensation for Stand-alone Inverters Using an Inductor Current Observer. Journal of Power Electronics, 17, 2, (2017), 389-397. DOI: 10.6113/JPE.2019.17.2.389.