English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

This paper proposes an island-mode voltage control method by using an open-loop control applying a high-gain disturbance observer (DOB) for a single-phase inverter with a low capacitance output filter. The output voltage is distorted with the low capacitance by the conventional method which consists of a PID regulator for an automatic voltage regulator (AVR) and a PI regulator for an automatic current regulator (ACR). In order to compensate the output voltage distortion, the high-gain DOB for the output voltage is applied in the open-loop-based voltage control. DOB is implemented into a field-programmable gate array (FPGA) with high-speed sampling. In the LC filter of a 1-kW prototype, the impedance of the inductor is minimized to 1.0% of the normalized inverter impedance, whereas the admittance of the capacitor is reduced to 0.25% of the normalized inverter admittance. By the proposed method, the inverter output voltage total harmonic distortion (THD) is reduced by 82.4% even with the diode rectifier load compared to the conventional voltage control, whereas the constant output voltage is achieved regardless of any conditions of load.

Open-loop-based Island-mode Voltage Control Method for Single-phase Grid-tied Inverter with Minimized LC Filter