Novel Single-Loop dq Control for LC Filter-Based Single-Phase Standalone Inverter Systems Under Nonlinear Loads

Standalone inverters must maintain their output voltage sinusoidal to ensure efficacious operation of the connected loads. The voltage profile is affected by the filters, modulation technique, and control strategy. The filters are limited by switching frequency under linear loads and are ineffective...

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Bibliographic Details
Published in:IEEE transactions on power electronics Vol. 40; no. 1; pp. 227 - 240
Main Authors: Iyer, Vaishnavvignesh G., Adda, Ravindranath
Format: Journal Article
Language:English
Published: IEEE 01.01.2025
Subjects:
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Control systems
Frequency-domain analysis
Inverters
multiple second-order generalized integrator (MSOGI)
nonlinear load
Power harmonic filters
single loop
standalone inverter
Switching frequency
Transfer functions
Voltage control
ISSN:0885-8993, 1941-0107
Online Access:Get full text
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Summary:Standalone inverters must maintain their output voltage sinusoidal to ensure efficacious operation of the connected loads. The voltage profile is affected by the filters, modulation technique, and control strategy. The filters are limited by switching frequency under linear loads and are ineffective under nonlinear loads. These limitations provide an opportunity to achieve the objectives using newer control schemes. Single-loop controls are simpler to implement and are faster in response compared to conventional cascaded controllers. This article focuses on developing and studying a novel linear control theory-based single-loop direct and quadrature (dq) control that has minimum execution time, fixed switching frequency, and a simple implementation algorithm for standalone inverter systems. This controller is tested under different loading and operating conditions. Furthermore, the proposed controller is extended to mitigate lower order harmonics under nonlinear load applications. The effectiveness of the control is tested experimentally against conventional controllers.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2024.3453390