研究目的
To guarantee accurate dc output voltage regulation and unity power factor operation for single-phase pulse-width-modulating rectifiers without the need of a phase-locked-loop (PLL), with an inherent current-limiting capability.
研究成果
The paper concludes that the proposed nonlinear controller with an inherent current-limiting capability effectively guarantees accurate output voltage regulation and unity power factor operation for single-phase rectifiers. The controller is fully independent of system parameters and does not require a PLL or the instantaneous measurement of the grid voltage, simplifying its implementation. Extensive experimental results support the theoretical background and verify the controller's effective operation under various conditions.
研究不足
The proposed controller's application is restricted to rectifiers and not to inverters due to the use of a positive dynamic virtual resistance. This represents a simplified control approach for rectifier-fed passive loads. Further investigation is required for a generic structure applicable to both types of ac/dc converters.
1：Experimental Design and Method Selection:
The paper proposes a nonlinear controller design for single-phase PWM rectifiers, focusing on achieving accurate dc output voltage regulation and unity power factor operation without a PLL. The methodology includes the development of a current-limiting nonlinear controller that is independent of system parameters.
2：Sample Selection and Data Sources:
The experimental setup involves a single-phase full-bridge rectifier with a load resistor RL, operating under the proposed current-limiting controller. The system parameters and controller parameters are detailed in the paper.
3：List of Experimental Equipment and Materials:
The experimental validation uses a switching frequency of 19 kHz for the PWM operation and the proposed controller was implemented using the TMS320F28335 DSP with a sampling frequency of 16 kHz. Specific filters are used for measurements.
4：Experimental Procedures and Operational Workflow:
The controller is tested under various conditions including load changes, reference dc output voltage changes, and grid voltage dips to verify its performance and current-limiting capability.
5：Data Analysis Methods:
The paper includes extensive experimental results to validate the proposed controller's performance under different operational scenarios.
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