Resumen de Application and control of series active conditioners in electrical distribution systems
Traditionally, the concept of voltage quality is referred to the average voltage level at the point of common coupling and, in most cases, an irregular voltage value is caused by a voltage sag. A more recent concept of voltage quality is not only tied to the average voltage level but also to the voltage waveform. In this sense, voltage harmonics are the major cause of voltage quality deterioration and they are essentially generated by nonlinear equipment such as diode rectifiers.
A Dynamic Voltage Restorer (DVR) is a power electronics device conceived to protect sensitive loads against voltage sags and swells and it is connected in series with an electrical distribution line. When a voltage sag takes place, the DVR injects the required voltage in series with the feeding line and the load voltage remains unchanged.
A Series Active Power Filter (SeAPF) is another power electronics device that shares the same basic topology with a DVR. A SeAPF is commonly used to improve the load-voltage quality and this filtering capability can be added seamlessly to a DVR. A DVR with filtering capabilities is commonly called Series Active Conditioner (SAC).
This thesis deals with the application and control of a SAC. Several control alternatives are studied in detail, with emphasis on harmonic-control algorithms. Power-flow limits and the DC-link voltage control of the VSC are also studied in detail. All the proposals in this thesis were implemented and tested on a prototype. Finally, the conclusions and guidelines for further research are presented.
