Mustafar Kamal Hamzah

Modelling and simulation of a single-phase AC-AC matrix converter using SPWM

This paper presents work carried out in developing computer simulation models using the Power System Block Set (PSB) within the MATLab/Simulink (MLS) environment. Its powerful filter design tools, signal processing capabilities are used to illustrate the convenience of modelling and simulation. The SPMC as a direct frequency changer were used in this work with the output being synthesized using the well-known SPWM technique. A comparison was made with SPICE and has shown that results in PSB were in good agreement from simulations carried out.

Safe Commutation Strategy in Single Phase Matrix Converter

The use of direct AC-AC converter based on matrix converter topology is restricted due to inherent limitations. One of those limitations is the absence of the natural free-wheeling path afforded in conventional converter topology through the use of diodes. In this work a simple commutation strategy for implementation in single phase matrix converter provides the required free-wheeling operation similar to those available in other converter topologies is proposed. The commutation scheme establishes a current path for energy to flow during dead-time, thus avoiding the generation of voltage spikes. Experimental results obtained in a laboratory test-rig are also presented to verify successful application of the technique.

Modelling and Simulation of a DC Chopper Using Single Phase Matrix Converter Topology

Choppers are widely used for traction motor control in electric automobiles and other electric transportation system. In those applications, control of dc motors speed is required where the supply is dc or an ac voltage that has been rectified. This paper presents work on development of four quadrant DC chopper based on the SPMC topology, an advanced topology that hypothetically could perform many different converter functions. Prior to hardware implementation a computer simulation model was developed using the power system block set (PSB) within the MATLAB/Simulink (MLS) environment, to study the behaviour of the proposed converter. Successful results presented are mainly due to the use of resistive load to reduce complexities. Results from PSB simulation are compared with those obtained from PSpice to ascertain its validity. The output is being synthesized using pulse width modulation (PWM) technique. It is shown that the same SPMC topology could be used as a DC chopper extending the versatility of the topology a desirable feature in the future as increases in costs for skilled manpower could be traded-off with versatile technology

A New Single-Phase Controlled Rectifier Using Single-Phase Matrix Converter

This paper presents the applications of single-phase matrix converter (SPMC) as an AC-DC controlled rectifier. For basic operation the multiple-PWM technique was used to calculate the switch duty ratio to synthesize the output. Safe commutation strategy was developed to avoid voltage spikes due to inductive load. Active current wave-shaping technique are also proposed to ensure that the supply current waveform is continuous, sinusoidal and in phase with the supply voltage. This approach utilizes boost rectifier technique for compensation. Selected experimental results are presented to verify the concept.

Implementation of Single-Phase Matrix Converter as a Direct AC-AC Converter Synthesized Using Sinusoidal Pulse Width Modulation with Passive Load Condition

The aim of this paper is to describe work involved in investigations on the implementation of the Single-Phase Matrix Converter (SPMC) as an AC-AC converter subjected to passive load conditions. The output voltage was synthesized using the well-known Sinusoidal Pulse Width Modulation (SPWM). A Xilinx Field Programmable Gate Array (FPGA) was used to implement the controlling algorithm with IGBTs as power switching device. Prior to hardware implementation, simulations were performed to predict the behaviour. A laboratory model test-rig of the SPMC was then developed to experimentally verify the result. Good agreement was obtained between simulation and laboratory experiments.

A New Single-Phase Controlled Rectifier Using Single-Phase Matrix Converter Topology Incorporating Active Power Filter

This paper presents application of single-phase matrix converter (SPMC) as a single-phase AC-DC controlled rectifier incorporating active power filter to ensure that the supply current is continuous, sinusoidal and in phase with the voltage. For basic rectifier operation, PWM technique was used to calculate the switch duty ratio to synthesize the output. Safe commutation strategy was developed to avoid voltage spikes due to inductive load. Basic loads represented by R load, RL load and non-linear loads are used for this investigation. Selected simulations and experimental results are presented to verify the proposed concept.

Studies on control electronics implementation of Single-phase Matrix converter operating as AC-DC Converter with active power filter

This paper presents studies on control electronics implementation of single-phase matrix converter operating as AC-DC converter with active power filter. The control electronics uses discrete integrated circuits (ICs) for analogue control whilst the peripheral interface controller (PIC) for digital control implementation. Comparisons are made on the performance with selected simulation and experimental results, to verify proposed operation.

Implementation of a new Single-phase Cycloconverter based on Single-phase Matrix Converter Topology using Sinusoidal Pulse Width Modulation with Passive Load Condit

In this work the single-phase matrix converter (SPMC) topology for cycloconverter operation are proposed for direct AC-AC conversion with step-down frequency operation. The well-known sinusoidal pulse width modulation (SPWM) scheme is used to synthesize the output. A Xilinx field programmable gate array (FPGA) was used to implement the controlling algorithm with IGBTs as power switching device. Prior to hardware implementation, simulations were performed to predict the behaviour. A laboratory model test-rig of the SPMC was developed to experimentally verify the result. Good agreement was obtained between simulation and laboratory experiments

A New Single-Phase Inverter with Bidirectional Capabilities Using Single-Phase Matrix Converter

This paper presents implementation of single-phase matrix converter as a DC-AC converter with bidirectional capabilities. Sinusoidal Pulse Width Modulation was used to synthesize the output waveform. The proposed converter proves to be a versatile topology extending the capabilities beyond the direct AC-AC converter and four quadrant DC chopper into inverter operation. Selected experimental results are presented to verify the proposed operation.

Modelling & Simulation of Single-phase Matrix Converter as a Frequency Changer with Sinusoidal Pulse Width Modulation Using MATLAB/Simulink

This paper presents work on modeling & simulation of single-phase matrix converter (SPMC) as a frequency changer modulated by the sinusoidal pulse width modulation (SPWM) subjected to passive load condition. The model was implemented using MATLAB/simulink with the SimPowerSystem Block Set. Comparisons with Pspice are made. The insulated gate bipolar transistor (IGBT) was used for the switching device. Safe-commutation strategy was implemented to solve switching transients with sample verification on results.