研究目的
To overcome the two-stage conversion in grid-connected PV systems by presenting a single-stage high gain DC-DC converter for coordinated control of MPPT and DC voltage regulation, and to validate its performance with reactive power compensation and harmonic reduction.
研究成果
The single-stage high gain DC-DC converter successfully achieves coordinated control of MPPT and DC voltage regulation, providing constant DC voltage to loads even when the inverter is disconnected. The system maintains grid power factor near unity, reduces harmonics below 5%, and acts as a STATCOM during nighttime. However, limitations exist in DC voltage regulation during converter faults.
研究不足
The DC voltage regulation is not possible at the DC link during fault or disconnection of the DC-DC converter, requiring a switch to inverter control in such scenarios.
1：Experimental Design and Method Selection:
The study involves designing a single-stage high gain DC-DC converter with three switches operating at different duty ratios for coordinated MPPT and DC voltage regulation. A decoupled control strategy with FOPI controller is used for inverter control. Perturb and Observe algorithm is employed for MPPT.
2：Sample Selection and Data Sources:
A 1KW grid-connected PV system is modeled using two 250W ELDORA250W PV panels in series and parallel configuration. Data on irradiation, temperature, and load conditions are simulated.
3：List of Experimental Equipment and Materials:
PV array (ELDORA250W panels), high gain DC-DC converter with switches, inductors, diodes, capacitors, single-phase H-bridge inverter, LCL filter, OP4500 Real-Time simulator, and various controllers (FOPI).
4：Experimental Procedures and Operational Workflow:
The system is modeled in Simulink and integrated with RT-Lab for software-in-the-loop testing. Step changes in irradiation and load are applied to analyze dynamic performance. Voltage, current, and power measurements are taken.
5：Data Analysis Methods:
Data on power outputs, duty ratios, harmonic distortion (THD), and power factors are analyzed to validate performance against IEEE 519 standards.
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