研究目的
To design a stable sliding-mode controller (SMC) based on fixed frequency equivalent control approach to improve the transient response of PV system and to track the reference voltage supplied by the voltage-oriented MPPT controller in the presence of environmental and load perturbations and converter output sinusoidal perturbations imposed by the second harmonic of the grid frequency.
研究成果
The proposed fixed-frequency integral sliding-mode current-controlled MPPT boost converter demonstrates superior performance in terms of fast transient response, reduced chattering magnitude, and effective tracking of reference voltage under various operating conditions. The controller's robustness to environmental and load perturbations, as well as its ability to mitigate low-frequency oscillations, makes it a viable solution for two-stage grid-integrated PV systems.
研究不足
The study acknowledges the dynamic interactions between the DC–DC converter, inverter, and MPPT controller as potential limitations that may affect system performances. Additionally, the robustness of the proposed controller under extreme environmental and load conditions is not fully explored.
1：Experimental Design and Method Selection:
The study employs a fixed frequency equivalent control approach for designing a stable sliding-mode controller (SMC) to improve the transient response of a PV system. The methodology includes the theoretical model of the SMC and detailed procedures for its implementation.
2：Sample Selection and Data Sources:
The study uses a two-stage grid-integrated PV system as the sample, with data acquired through simulation using PSIM software and experimental validation.
3：List of Experimental Equipment and Materials:
The equipment includes a PV module, DC–DC converter, inverter, and various controllers (SMC, PI controller). The materials and their specifications are detailed in the paper.
4：Experimental Procedures and Operational Workflow:
The procedure involves designing the SMC, implementing it in the PV system, and comparing its performance with variable frequency hysteresis-based SMC through simulation and experiments.
5：Data Analysis Methods:
The performance of the proposed SMC is analyzed in terms of PV voltage and current tracking under different irradiation and load perturbations, with a focus on settling time and chattering magnitude.
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