Generalised AC/DC Powerflow
In modern grids, there exist many devices that are able to control bus and branch magnitudes both locally and remotely: Voltage Source Controllers (VSCs) can control the active and reactive powerflows, offering high flexibility in controlling power transmission and bus voltages. Additionally, modern...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/425603 |
| Acceso en línea: | https://hdl.handle.net/2117/425603 |
| Access Level: | acceso abierto |
| Palabra clave: | Electric networks Electric power systems Xarxes elèctriques Sistemes de distribució d'energia elèctrica |
| Sumario: | In modern grids, there exist many devices that are able to control bus and branch magnitudes both locally and remotely: Voltage Source Controllers (VSCs) can control the active and reactive powerflows, offering high flexibility in controlling power transmission and bus voltages. Additionally, modern grids are not pure AC systems: HVDC links are important features that interconnect two or more AC subsystems between countries. These advances in grid technology mean that the traditional powerflow method is no longer sufficient. The traditional NewtonRaphson powerflow method relies on classifying AC buses into one of three categories: PV (knownactive powerandvoltage), PQ(knownactivepowerandreactivepower)andslackbuses (known voltage and phase angle). This method is well-known and widely used, but it severely limits how bus and branch magnitudes can be set within the Newton-Raphson formulation. Rather, we require a power flow method that can properly model the grid of the present and the future. This work presents a new generalized power flow method that does not require any pre-selection of bus types. This novel method also allows for the solving of hybrid AC/DC systems in a unified manner, that is, without the use of separate iteration loops for AC and DCsubsystems. Using its implementation in GridCal, an open-source power system analysis software, the method is tested on a number of systems, including a 6-bus grid, a modified IEEE 14-bus system, and the IEEE 118-bus system. The results show that the method is able to solve the power flow problem in a reasonable amount of time. |
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