研究目的
To present a case study of an efficient photovoltaic (PV) generation integrated with a multilevel inverter for a hybrid PV/fuel cell/battery standalone power system, ensuring regulated power at the user end and reducing total harmonic distortion (THD) compared to a three-level inverter.
研究成果
The hybrid PV-SOFC-battery system with a five-level PWM inverter effectively provides regulated power and reduces THD compared to a three-level inverter. The P&O MPPT technique successfully tracks maximum power from the PV array. Simulation results confirm the system's feasibility for standalone applications, with lower harmonic distortion improving power quality. Future work could involve hardware implementation and testing under varying environmental conditions.
研究不足
The study is based on simulations in MATLAB/Simulink, not real-world experiments, which may not account for all practical variations and losses. The inverter topology and control are specific to the designed system, and scalability or integration with other renewable sources is not explored. The THD reduction is demonstrated only for the given setup, and further optimizations or comparisons with other inverter types are not included.
1：Experimental Design and Method Selection:
The study uses a hybrid power system combining PV array, solid oxide fuel cell (SOFC), and battery with a five-level PWM inverter. Perturb and Observe (P&O) algorithm is employed for maximum power point tracking (MPPT) in the PV system. Sinusoidal pulse width modulation (SPWM) is used for inverter control. MATLAB/Simulink is utilized for simulation and analysis.
2：Sample Selection and Data Sources:
The PV array parameters are based on standard design with specific ratings (e.g., short circuit current 5 A, open circuit voltage 48 V). The SOFC model is derived from chemical equations and existing literature. No specific real-world data sources are mentioned; simulations are conducted in MATLAB/Simulink.
3：List of Experimental Equipment and Materials:
PV array, SOFC, battery, boost converters, five-level PWM inverter (with switches Q1-Q5), MATLAB/Simulink software for simulation. No specific brands or models are provided for hardware; the focus is on simulation models.
4：Experimental Procedures and Operational Workflow:
Two cases are simulated: Case I with PV array only (SOFC off) and Case II with PV array and SOFC both. The PV output is boosted using converters to 550V, and the inverter converts DC to AC. THD analysis is performed on the inverter output and compared between five-level and three-level inverters.
5：Data Analysis Methods:
Simulation results include output voltage, current, and THD measurements. THD is calculated and compared quantitatively (e.g., 28.42% for five-level vs. 48.47% for three-level inverter).
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