Simulation of buck or boost rectifier using Single Phase Matrix Converter with reduced switch count
Single Phase Matrix Converter (SPMC) operating as buck or boost rectifier with reduced switch count is illustrated in this paper. Six switches can be used in the proposed configuration as compared to eight switches in conventional SPMC, by removing two unused switches for buck or boost rectifier operation. Both buck and boost rectifier uses same circuit topology with six switches and R load. The operation of both buck and boost rectifier are observed and variation of output voltage with modulation index is analyzed. To synthesis the output pulse width modulation (PWM) technique is used. Buck and boost rectifier circuits are modeled using MATLAB/Simulink and selected simulation results are shown in this paper.
Computer simulation of single-phase control rectifier using single-phase matrix converter with reduced switch count
In this paper, single-phase control rectifier using single-phase matrix converter with reduced switch count is proposed. The proposed method is able to perform AC-DC converter operation using only six switches as perform by conventional single-phase matrix converter that uses eight main switches. The PWM technique was used to calculate the switch duty ratio to synthesize the output. Switch commutation arrangements were developed that allows dead time to avoid current spikes of non-ideal switches whilst providing a current path for the inductive load to avoid voltage spikes. The SPMC topology with reduced switch count can be easily control using suitable proposed switching algorithm. The feasibility of the proposed topology was verified by a computer simulation.
A Simple Current Control for Matrix Converter
As the matrix converter performs electric energy direct transfer from the input to the output, the distortion and the unbalance of the input voltages affects directly the output of the matrix converter. This paper presents a new and simple current control for matrix converter based on the fact that if the magnitude of the output current space vector is constant, the output currents are sinusoidal and balanced. With this current control, it is possible to compensate the output of the matrix converter under unbalanced and distorted input voltage conditions without the need of symmetrical components decomposition of the input voltage or reference frame conversions. So it is not necessary heavy computation capability and the hardware implementation is very simple. The proposed current control scheme employs only one PI regulator and since that the space vector modulation is applied in this control, the switching frequency of the converter is kept constant