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| Author(s): |
Jakson Paulo Bonaldo
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação |
| Defense date: | 2015-08-05 |
| Examining board members: |
José Antenor Pomilio;
Fernando Luiz Marcelo Antunes;
Ricardo Quadros Machado;
Marcelo Gradella Villalva;
Fernando Pinhabel Marafão
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| Advisor: | Helmo Kelis Morales Paredes; José Antenor Pomilio |
| Abstract | |
This thesis presents the development of strategies to operate grid-tied power electronic converters, which are conventionally used as power interface between renewable power sources and the grid, as a multifunctional device. Through the application of the proposed control techniques, the grid-tied converter is able to aggregate additional features intended to perform ancillary services related to power quality improvement. Therefore, the original function of the grid-tied converter is combined with features of an active power filter. The strategies developed to allow the multifunctional operation are based on the current throughout a local load which is connected at the point of coupling of the converter. By means of the decomposition of the load current into orthogonal components it is possible to choose the kind of disturbance to be compensated, as well as, the level of compensation. However, due to the unpredictable behavior of renewable energy sources and loads, the power or current capacity available in grid-tied converter may be insufficient to perform its primary function, i.e. the injection of the active power generated by the energy source, along with the power quality improvement. Therefore, strategies to limit the power or current processed by the converter are developed giving priority to the active power injection. It is also presented a brief study about the coordinated operation of multifunctional power converters used in smart microgrids. A communication network is used to connect the power converters to a remote central of supervision that adjusts the ancillary services each converter should perform. Analysis, tests and discussions performed in this thesis consider a scenario commonly observed in low voltage energy networks, where the grid is weak and, in general, non-sinusoidal. The strategies and techniques proposed were validated through experimental results obtained by the implementation of multifunctional power converters prototypes (AU) | |
| FAPESP's process: | 11/15884-6 - Multifunctional power electronics converters for smart micro-grids |
| Grantee: | Jakson Paulo Bonaldo |
| Support Opportunities: | Scholarships in Brazil - Doctorate |