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JPE, Vol. 17, No. 2, March 2017
Load Disturbance Compensation for Stand-alone Inverters Using an Inductor Current Observer
Jung-Muk Choe, Seungryul Moon, Byeng-Joo Byen, Jih-Sheng Lai, Young-Bae Lim, and Gyu-Ha Choe
Area Analysis, Modeling and Control
Abstract 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.
Keyword Inductor current observer,Isolated grid,Load disturbance compensation,Single-phase inverter,Stand-alone inverter
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