Mixed power quality treatment method

The invention discloses a mixed power quality treatment method. In an active part, at least two groups of static var generators and at least two groups of active power filters are connected to a three-phase power network in a transformer isolation mode, wherein the static var generators mainly compensate reactive current, the active power filters compensate harmonic current, and when the voltage dips seriously, the active power filters can also make up for the deficiency of the static var generator capacity; and in a reactive part, a directly hung static var generator combined by a thyristor-controlled electric reactor and a thyristor switched capacitor, as well as a fixed capacitance compensator is directly connected to the three-phase power network for reactive compensation, three-phase unbalance is compensated, the thyristor switched capacitor provides large-capacity capacitive reactive power, the fixed capacitance compensator provides small-capacity reactive power, and the fixed capacitance compensator also serves as a main subharmonic filtering subcircuit of the thyristor-controlled electric reactor for coordinative comprehensive compensation and harmonic treatment of a power system.