\nthe \u201cactive substation\u201d. The active substation allows\u00a0bidirectional power flow between the power grid and the\u00a0DC catenary, which means the active power flow from the
\npower grid to the DC catenary and the recovered power\u00a0flow from the catenary back to the power grid. At the same\u00a0time, because the compensator acts like an active filter in
\nthe first case and like a power inverter in the last case, both\u00a0the consumed and recovered power are active powers. To\u00a0achieve this goal the active compensator must inject current
\nto the point of common coupling, and the typical currentcontroller is the hysteresis regulator. At the same time, the\u00a0typical approach on the injected current regulation is the
\ndirect current control, which implies the closed loop controlof the current at the compensator output, i.e. the current\u00a0through the output inductors. A new approach is the closed\u00a0loop control of the current absorbed from the power grid,\u00a0i.e. the indirect control, for which the compensator controls\u00a0the grid current, and for a given load current, the compensator\u00a0injected current results from the first two.<\/td>\n
![\"images\"](\"http:\/\/elth.ucv.ro\/fisiere\/anale\/wp-content\/uploads\/2015\/03\/images1.jpg\")
<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"Abstract Although the high power DC traction substations\u00a0are using 12 pulse rectifier which have lower distortion than\u00a0the classical 6 pulse rectifier, considering the high power,\u00a0the reactive and harmonic components of the absorbed current\u00a0are harmful to the power grid. The addition of an active\u00a0compensator to the classical dc traction substation creates the \u201cactive substation\u201d. The active … Continue reading Study of Indirect Current Control Methods for Urban Traction Active DC Substations<\/span>