SRFPI-LADRC Based Control Strategy for Off-Grid Single-Phase Inverter: Design, Analysis, and Verification

Linear active disturbance rejection control (LADRC) has been extensively used in various areas due to its excellent disturbance suppression capability. When LADRC is applied to a single-phase inverter for tracking a sinusoidal reference signal, there is an inherent tracking inaccuracy problem. The s...

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Bibliographic Details
Published in:Electronics (Basel) 2023-02, Vol.12 (4), p.962
Main Authors: Lin, Liaoyuan, Li, Haoda, Zhu, Kai, Shi, Lingling
Format: Article
Language:English
Subjects:
Active control
Bandwidths
China
Control methods
Control systems
Design and construction
Dynamic response
Electric inverters
Electric potential
Electric power systems
Harmonic distortion
Inverters
Methods
Power supply
Proportional integral
Reference signals
Rejection
Stability analysis
Steady state
Systems stability
Tracking errors
Voltage
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Summary:Linear active disturbance rejection control (LADRC) has been extensively used in various areas due to its excellent disturbance suppression capability. When LADRC is applied to a single-phase inverter for tracking a sinusoidal reference signal, there is an inherent tracking inaccuracy problem. The steady-state error can be removed with the synchronous reference frame proportional-integral (SRFPI) control, which generates two orthogonal signals. In this paper, a modified control method based on compound SRFPI and LADRC for an off-grid single-phase inverter is put forward, where both output signals of SRFPI are employed as the reference signals of LADRC. Furthermore, a selective harmonic compensation method is performed by paralleling multiple SRFPI controllers to further reduce the selective harmonic components. Detailed theoretical analyses including system stability, robustness, performance of voltage tracking error and disturbance rejection are presented, which indicate that this organic combination fuses the merits of both SRFPI and LADRC without complicating the control design. Additionally, contrast experiments are conducted to demonstrate its effectiveness and superiority. These findings demonstrate that the system realizes a slight voltage tracking error and steady-state error, rapid dynamic response, and low total harmonic distortion (THD), especially under highly nonlinear load conditions.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics12040962