2. Compensation using IGBT-based static devices (STATCOM)

2.1 CHB (Cascaded H Bridge) topology

Today's technological developments mean that solutions based on IGCT and IGBT blockable DC voltage intermediate circuit converters are now technically and economically viable for high power ratings. For low and medium power ratings, solutions based on active filters are available. Here, we will only deal with high-power topologies. These converters are of the CHB (Cascaded H Bridge) type. Figure 34 shows the structure of an elementary bridge called a submodule (SM). Each sub-module can produce a positive voltage + U _sm , or a negative voltage – U _sm or zero...