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A novel reduced switch count AC/AC converter is proposed in this paper which can compensate for unbalanced characteristics of both the input AC source and the output three-phase load. The proposed converter satisfies all the expectations of an ideal robust converter such as unity input power factor, low THD sinusoidal input current and output voltage and fast dynamic response even under serious fault...
A new algorithm is proposed in this paper for switch reduction in multi-output single-phase converters. The idea is first explained by introducing the dual-output six-switch inverter and then generalized into the switch reduction of m-output topology. Two modes of operation are defined for the proposed converter and the modulation scheme of each mode is devised. To compensate for the reduced dc bus...
A new reduced-switch-count converter topology is introduced and proposed for UPS applications in this paper. The modulation scheme of this novel converter is developed and a method is devised for calculating the optimal operating point of the converter based on the design specifications in order to maximize dc bus voltage utilization while minimizing the output voltage THD and switching loss. Moreover,...
This paper proposes a novel UPQC system based on dual-output four-leg converter. The proposed system completely fulfils the main functions of the conventional UPQC system. It is also capable of compensating any unbalance characteristics at load side (parallel side) or grid side (series side) such that the drawn currents from the grid and the voltage of the load are balanced and sinusoidal, regardless...
Despite all the unique features multilevel converters offer, their high number of required power switches has restricted their implementation to particular applications. To mitigate this problem, a novel multilevel ac/ac converter is proposed in this paper which utilises less number of semiconductor devices in its structure. The proposed converter is achieved by cascading recently introduced reduced...
This paper investigates the switching-table based direct torque control (ST-DTC) drive of induction motors using a three-level neutral-point clamped inverter. A novel optimized switching table for ST-DTC is proposed regarding the effects of motor speed and load on torque changes. Furthermore, for deviation of neutral point voltage in three-level NPC inverter, an innovative closed loop control method...
This paper proposes a novel inverter for supplying unbalanced four-wire three-phase loads. The inverter has two three-phase outputs that operate with independent frequencies and amplitudes. Within each output, each phase can have independent voltage magnitude, but the frequency is the same for all phases. The topology is developed by adding an extra leg to a nine-switch converter. Moreover, it benefits...
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