Читать книгу Microgrid Technologies - Группа авторов - Страница 43

The basic circuit of a GUPFC developed by Fardanesh in the year 2000 is shown in Figure 2.6. It inferred from the figure that it is a combination of UPFC and Interline Power Flow Controller (IPFC). There is one shunt connected converter (STATCOM) and multiple series-connected converters (SSSC). The series converters and shunt converter are connected to a common capacitor to form the DC bus. The shunt converters and the series converters act as a synchronous voltage source (SVS). These converters can generate reactive power at their terminals. Free exchange of real power is possible because of common DC link. The real power demand is fulfilled by shunt converter, which at the same time can absorb or supply controllable reactive power and exchange the same with series converters. The series converters can individually inject a voltage to the appropriately connected feeder whose magnitude and phase angle can be varied to obtain the desired voltage output. Thus the series converters act as a series compensation device. It means that the overloaded feeder lines can be balanced and any surplus power utilized by other feeders or common DC link [1, 12, 13].

Figure 2.6 Basic GUPFC.