研究目的
Investigating the design and performance of an observer-based state-space current controller for a grid-connected converter equipped with an LCL filter, focusing on direct discrete-time design and automatic tuning capabilities.
研究成果
The paper presents a direct discrete-time design method for an observer-based state-space current controller, enabling automatic tuning and real-time adaptation. The method shows good resonance damping and dynamic performance, with less sensitivity to grid inductance variations than to LCL filter parameter variations. Experimental results validate the design's superiority over continuous-time domain designs in terms of dynamic performance and resonance damping.
研究不足
The study assumes accurate parameter estimates and a stiff grid voltage, which may not always be the case in practical applications. The sensitivity to parameter variations and grid inductance is analyzed, but the method's performance under extreme or unmodeled conditions is not fully explored.
1：Experimental Design and Method Selection:
The study employs a direct discrete-time design method for an observer-based state-space current controller, using pole placement in synchronous coordinates for resonance damping and dynamic performance specification.
2：Sample Selection and Data Sources:
The experiments are conducted on a 12.5-kVA 400-V grid-connected converter equipped with an LCL filter, with system parameters provided in Table I.
3：5-kVA 400-V grid-connected converter equipped with an LCL filter, with system parameters provided in Table I.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup includes a dSPACE DS1006 processor board for control implementation, a 50-kVA three-phase four-quadrant power supply for grid voltage distortion, and a back-to-back connected converter for load feeding.
4：Experimental Procedures and Operational Workflow:
The control method is implemented with a switching frequency of 4 kHz and synchronous sampling. The performance is evaluated under grid-voltage harmonics and dips, with harmonic levels and voltage dips specified.
5：Data Analysis Methods:
The stability and performance are analyzed through eigenvalue calculations for the closed-loop system, frequency responses, and harmonic distortion measurements.
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