The converter operates in inverter state
The converter operates in best power inverter state, if the AC side of the converter to an AC power source, the DC to AC inverter to the power grid with the frequency of anti-go, called active inverter. If the change is not the AC side current grid connection, but directly to the load, that is, the DC inverter for a particular frequency or adjustable frequency alternating current supplied to the load, then called passive inverter. AC inverter is to use this principle. Except for DC reversible active inverter speed control system, but also for AC induction motor rotor Rao wire cascade control and other aspects of HVDC.