Name: AMAURI CESAR CRISTOFANO JUNIOR
Publication date: 13/04/2023
Advisor:
Name |
Role |
|---|---|
| OURESTE ELIAS BATISTA | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| AUGUSTO CÉSAR RUEDA MEDINA | Internal Examiner * |
| MARCIO ALMEIDA CÓ | External Examiner * |
| OURESTE ELIAS BATISTA | Advisor * |
Summary: Electric power systems (EPS) have as premise the supply of electric energy in a reliable way, without interruptions, with quality, and in a safe way for consumers. Making this SEP operate correctly under abnormal events, in short circuits for example, is one of the ways to obtain these characteristics. This work aims to study the impacts that the massive integration of distributed generation based on inverters causes in an EPS, study the characteristics of this type of generation, its behavior in short circuits, evaluate the impacts on the protection, coordination and selectivity design. The electrical system used for the study was the IEEE example model of 123 nodes, simulations were performed using the OpenDSS software, which was controlled by the Pycharm
software, in python language, performing the integration of photovoltaic generators based on inverters in the electrical system studied , and activating the OpenDSS software to calculate the power flow and short-circuit currents.
A protection project was developed using intelligent devices IEDs and fuses, this project included overcurrent protection, 50 in the ANSI standard, and with that an analysis was carried out, element by element, if after the massive insertion of generators based on inverters, GBI , their contribution to the short-circuit currents would make the electrical system uncoordinated and non-selective. Short-circuit current calculations were performed without GBI integration, and with 20%, 40%, 60%, 80% and 100% of the nominal power of the loads, and the maximum current variation was verified short-circuit currents, which were around 7.58% for the three-phase short-circuit currents and 6.73% for the single-phase ones. Despite the massive insertion of GBI, with the sum of the rated power of all loads, changing the power flow characteristic of the EPS studied, their contributions to shortcircuit currents ICC do not have much impact on overcurrent protections, in coordination and selectivity, since this maximum variation is around 7.58%.
