Carrier-Based Generalized Discontinuous PWM Strategy for Single-Phase Three-Legs Active Power Decoupling Converters

Three-legs active power decoupling (APD) converters are widely studied in the single-phase grid-connected systems to enhance circuit lifetime by creating an alternative path for typical existing dc-side pulsating ripple. Therefore, this reduces requirement of smoothing dc capacitors allowing compact designs even with implementation long life metalized film technology. In article, allow enhancement system density improving conversion efficiency and thus reducing thermal management semiconductors, a carrier-based generalized discontinuous PWM strategy is proposed. This method detects converter ac currents reference voltages determine optimum clamped duration each one three bridge-legs, which will minimize overall switching losses. The proposed modulation analyzed validated on PLECS simulation 2 kVA three-legs APD converter.