Modelling and simulation of a PV generator for applications on distributed generation systems

Solar energy is expected to play a great role in the grid’s future infrastructure as a distributed source. The expected high penetration of photovoltaic (PV) power into the existing electricity grid demands a more detailed study and analysis of the interaction between PV systems and the grid, to enable safe and reliable operation. Until recently, in the case that an electromagnetic transient software package was used for a PV system study, a PV generator model had to be developed by simulating a complex block-circuit using several control demands and elements. Thus, the need of implementing a less complex model for enhancing not only less simulation time but also showing the electrical behavior of PV generators is essential. In this project a circuit-based simulation model of a PV generator by Electromagnetic Transients Program (EMTP) is proposed. The equivalent circuit of the generator is based on a linearization process using the Newton-Raphson algorithm, in order to uncouple its current and voltage quantities. The simplified model is represented by a dependent current source in parallel with a variable conductance. The association of the proposed generator model with RLC circuits is simulated and the results are compared with measurements results, proving that the model can successfully predict the nonlinear performance of the PV generator. The model is also combined with a single-phase grid-connected system, of which all the components are also developed in EMTP. The evaluation and modeling of the PV system is performed with data from real PV modules. Interfacing the EMTP-based model of the PV generator with Simulink is demonstrated with four case studies, using an already validated three-phase grid-connected hybrid PV/battery model. The case studies simulated prove the expandability of the proposed PV generator model in three-phase systems and the adaptation potential in large-scale systems.

Subject

photovoltaics
EMTP
PV system
electromagnetic transients
distributed generation

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http://resolver.tudelft.nl/uuid:259fa81e-fa57-48f3-802a-f209f1e74006

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Student theses

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master thesis

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