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A new zero-sequence circulating current (ZSCC) reduction method for multimodule voltage source inverters (MVSIs) consisting of three-phase inverters that are connected in parallel is proposed in this paper. Four-switch inverter modules are used instead of the conventional six-switch modules to reduce the cost. In this paper, the effectiveness of the proposed ZSCC reduction method is studied using...
This paper presents a novel control strategy of AC/DC power converters. The proposed control algorithm is based on Sliding Mode Control methodology. The basic idea is to apply feedback implementation of pulse-width modulation (PWM). The method exhibits low sensitivity to disturbances and fast dynamic performance in addition to the main converter properties. The proposed sliding mode control method...
In the present work Selective Harmonic Elimination Pulse Width Modulation (SHE-PWM) based on Particle Swarm Optimization is proposed for the enhancement of the H-Bridge multilevel inverter output voltage quality. The problem of the SHE-PWM is presented by a constrained nonlinear objective function which has to be minimized. The main aim is the calculation of the switching angles vector solution representing...
Flying Capacitor (FC) multilevel Pulse Width Modulated (PWM) converters are an attractive choice due to the natural balancing property of the capacitor voltages. The balancing can be studied in the time domain, which results in easy to interpret expressions regarding parameter influence. Time domain analysis is normally done by time averaging of the system model over a PWM-period. In this paper a...
This paper presents a low switching frequency, selective harmonic elimination (SHE) modulation method which may be applied to a cascaded H-bridge active rectifier. The method is based on a decoupled scheme where the modulation index of each H-bridge cell is controlled independently to enable complete control of power flow through the converter. The method utilises a phase shift between the AC side...
Multilevel inverters supplied from equal and constant dc sources almost donpsilat exist in practical applications. The variation of the dc sources affects the values of the switching angles required for each specific harmonic profile, as well as increases the difficulty of the harmonic eliminationpsilas equations. This paper presents an extremely fast optimal solution of harmonic elimination of multilevel...
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