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| Author(s): |
Amilcar Flamarion Querubini Gonçalves
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2015-01-29 |
| Examining board members: |
Ricardo Quadros Machado;
Manoel Luís de Aguiar;
Lourenço Matakas Júnior;
José Roberto Boffino de Almeida Monteiro;
Ernesto Ruppert Filho
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| Advisor: | Ricardo Quadros Machado |
| Abstract | |
This thesis presents a control strategy to manage the power delivered to or absorbed from the grid, independently of the local load characteristics. To achieve this goal, a voltage source inverter (VSI) will work as a distributed generation system (DG) or according to active filter. The VSI will be controlled by means of a double cascade classical controller, in which the inner loop is used to stabilize the VSI output current and the outer loop controls the DG terminal voltage. To improve the response of the VSI, resonant filters are placed in parallel. Additionally, resonant filter dynamic responses are enhanced through the use of a proper discretization method, in which the coefficients are changed dynamically by means of the synchronism frequency produced by the phase-locked loop (PLL) algorithm. This study also exhibits two closed-loop structures: one to control the reactive power through the grid by adjusting the DG voltage amplitude, and the other to control the active power by modifying the angle of displacement between the grid and the DG voltages. Both power control structures operate adequately in decoupled operation mode, so that one has a faster dynamic response than the other. To verify all statements proposed in this thesis, a set of simulations and experimental results are presented. (AU) | |
| FAPESP's process: | 11/10880-2 - Distributed Generation System Controlled in Voltage and Power Modes for Stand-alone or Grid-tie Operation |
| Grantee: | Amilcar Flamarion Querubini Gonçalves |
| Support Opportunities: | Scholarships in Brazil - Doctorate |