1. Load Disturbance Compensation for Stand-alone Inverters Using an Inductor Current Observer
- Author
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Seung-Ryul Moon, Byeng-Joo Byen, Gyu-Ha Choe, Jung-Muk Choe, Young-Bae Lim, and Jih-Sheng Lai
- Subjects
Total harmonic distortion ,Engineering ,Observer (quantum physics) ,business.industry ,020208 electrical & electronic engineering ,020302 automobile design & engineering ,02 engineering and technology ,Inductor ,Controllability ,0203 mechanical engineering ,Control and Systems Engineering ,Control theory ,Delay ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Inverter ,Waveform ,Current sensor ,Electrical and Electronic Engineering ,business - 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.
- Published
- 2017