| Summary: | 碩士 === 國立勤益技術學院 === 資訊與電能科技研究所 === 94 === The purpose of this thesis is to develop a circuit-based simulation model for the photovoltaic (PV) panel system by using the PSIM software package. The proposed model of the PV panel system can be used to carry out the fault analysis of PV modules, characteristic research on series and/or parallel combinations of PV modules, and the I-V characteristics of the PV module under different insolation, surface temperature and module fault type. The proposed model can be adopted to any brand PV panels by setting the parameters. A 3kW PV system with the SIEMENS SP75 solar module is as an example to verify the validities of the proposed simulation model.
In this thesis, an extension diagnosis technology based on the extended correlation function and the matter-element model was also proposed to identify the faulting types of the 3kW PV system. The simulated results indicate that the proposed fault diagnosis method can detect the malfunction types correctly and promptly. Furthermore, the possibilities of the other malfunction types can be also showed. The less constructed data utilized, no learning procedures needed and high identification rate are the good features of the proposed fault diagnosis method.
Finally, the circuit configures, switching control scheme and fundamental theorem of the power converter units (DC/DC converter and inverter) for photovoltaic systems are studied. The design of components and feedback controller(PI) parameters for the boost DC/DC converter and inverter are introduced in detail. To overcome the control performance degradation due to nonlinear load changes, a voltage robust waveform controller is designed for the inverter. The simulation results show that the better output voltage waveforms can be obtained under linear and nonlinear load changes by using the proposed robust waveform control scheme.
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