研究目的
To present a performance-improved MPPT controller for PV systems that enhances dynamic response to rapid changes in solar irradiance and dc bus voltage fluctuations.
研究成果
The proposed MPPT controller, which applies derivative control to PV voltage instead of reactor current, demonstrates superior dynamic performance. It reduces PV power decrease by 80% during dc bus voltage fluctuations compared to conventional methods and maintains good response under rapid solar irradiance changes, outperforming existing approaches in tracking speed and average power output.
研究不足
The study is based on circuit simulation (PSIM) and may not fully capture real-world conditions or hardware imperfections. The system scale is approximately 1/20 size of a 400V dc power feeding system, limiting generalizability to larger systems. Only specific parameter variations (Isc and Vbus) are tested, and the derivative control gains are fixed, which might require optimization for different scenarios.
1：Experimental Design and Method Selection:
The study uses a circuit simulation approach with a dc-dc boost converter model. The proposed MPPT controller combines a perturb and observe (P&O) control with a derivative control applied to the PV panel voltage, compared to existing methods using derivative control on reactor current.
2：Sample Selection and Data Sources:
A simulated PV panel model with parameters such as short circuit current (Isc) variations (1A to 3A) and dc bus voltage fluctuations (15V to 20V) is used.
3：List of Experimental Equipment and Materials:
The simulation involves a dc-dc boost converter with components including inductor (L=300μH), capacitors (Ci and Co=800μF), and ADCs with 12-bit resolution. The circuit simulator PSIM is employed.
4：Experimental Procedures and Operational Workflow:
Simulations are conducted to observe transient responses under specified voltage and current changes, with control parameters set (e.g., switching frequency fs=100kHz, MPPT frequency fMPPT=100Hz, perturbation ΔD=
5：01, derivative gains GD_v=2/V, GD_i=2/A). Data Analysis Methods:
Performance is evaluated by comparing power output (Pi), voltage (Vi), current (iL), and duty ratio (D[n]) responses across conventional, existing, and proposed methods using graphical analysis from simulation results.
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