Active power filter; capacitor voltage balance; neutral point clamped converter; power factor correction Bandpass filters; Controllers; Electric current control; Electric inverters; Passive filters; Reactive power; Voltage regulators; Active power Filter; Capacitor voltage balance; Experimental validations; Neutral point clamped converters; Neutral point clamped inverters; Power factor corrections; Shunt active power filters; Single-phase Active Power Filter; Active filters