buck & boost operation using single phase matrix converter
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MALAVIYA NATIONAL INSTITUTE OF TECHNOLOGY, JAIPUR.A SEMINAR PRESENTATION ON
BUCK & BOOST OPERATION USING SINGLE PHASE MATRIX CONVERTER
CONTENTS1.Introduction to Single Phase Matrix Converter. 2. Controlled Rectifier using SPMC.
3.Boost rectifier using SPMC.4.Buck operation using SPMC. 5.SPMC incorporating APWM Technique.
6.Buck operation Simulation Results.7.Boost rectifier simulation Results. 8.Comparision of conventional Boost rectifier and SPMC with APWM. 9.Conclusion. 10. References.
SINGLE PHASE MATRIX CONVERTER
Single Phase Matrix convert(SPMC) consists of Matrix input and output lines with four bi-directional switches connecting the single phase input to single phase output.
The main advantage of Matrix converter over conventional converters is it doesnt have any reactive elements hence helps in power factor improvement.
It is inherently bidirectional, so, can regenerate energy back to supply.
Injected current Harmonic s are reduced as a result power quality gets increased.
CONTROLLED RECTIFIER USING SPMC
There will be two states positive state and negative state.
Although, only positive state is used. Negative state isredundant.
BOOST RECTIFIER USING SPMC
For Boost rectifier operation a pair of switches S1a and S4a are turn ON state whilst switch S3a implements PWM control in positive cycle.
For Negative cycle, S3b and S2b are turn into ON state,
whilst S4b provides control using PWM.
Switching frequency is 5KHz.
The proposed operation can be divided in to four modes.
When the Inductor current rises from I1 to I2 in time t1,
And when Inductor current falls linearly from I2 to I1 in time t2,
Where, I = I2- I1 the peak-to-peak is ripple current of inductor L. From equations (1) and (2),
Substituting t1= kT and t2 = (1-k)T yields the average output voltage,
Substituting k=t1/T = t1f into equation (5) yields
Assuming a lossless circuit, VsIs = Vout Iout = Vs Iout/(1-K) And average Input current is,
The switching period T can be found from
And this gives the peak-to-peak ripple current
BUCK OPERATION USING SPMC
SPMC INCORPORATING APWM
The proposed controlled rectifier with active PWM using SPMC is as follows,
It is divided into three major components 1) SPMC circuit 2) Boost Inductor 3) Control function Active power filter is used to force the supply current to follow the reference signal. Capacitor C is connected to the line circuit in such a way that its voltage brings a drop in the supply current below reference value.
BUCK OPERATION SIMULATION RESULTS
MATLAB/Simulink is used for simulation of SPMC. RC load of 300 and 1000F is simulated.
BOOST RECTIFIER SIMULATION
The SPMC as Boost rectifier with R load is simulated as shown in figure..
Active power filter function is incorporated to compensate the distorted supply current to become sinusoidal and in-phase with the supply voltage resulting with low total harmonics distortion(THD) .
SPMC WITH APWM
Supply current has been improved from a THD level of 101% to THD level of below 6.52% when using SPMC with APWM technique.
COMPARISION OF CONVENTIONAL BOOST RECTIFIER & SPMC WITH APWM
The buck operation using SPMC with RC load and boost rectifier using SPMC topology with R load and RC load has successfully
been implemented. The supply current waveform for the RC loadwith APWM function results with an almost sinusoidal and in-phase with the supply voltage. This results in improved power factor and reduced THD level. The simulation results have been presented in the form of waveforms and tabulated data to verify the operation of the proposed rectifier. It is shown that the SPMC topology has inherent versatility extending beyond the direct AC-AC converter, DC chopper and rectifier operation.
. Renjini G, Buck and Boost operation using single phase Matrix Converter, Power and Energy Conference, April 2009, PECon. Vol 15, Page(s): 587-595.  Sobczyk, T., "Numerical Study of Control Strategies for Converter," Frequency Conversion with a Matrix Converter," Proceedings Of Conference on Power Electronics and Motion Control, Warsaw, Poland, 1994, pp. 497-502.  Aluisio A. Bento, Edison R. da Silva and Euzeli C. dos Santos Jr., "Reducing the Inductor Size and Current Stress by Interleaved Bidirectional Boost Rectifiers Used for Power Factor Correction", Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06. 19-23 March 2006.  P. W. Wheeler, J. Rodriguez, J. C. Clare, L. Empringham, A.Weinstein; Matrix converters: a technology review, IEEE Transactions on Industrial Electronics., Vol. 49, April 2002, Issue: 2, Page(s): 276-288.
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