This paper proposes a new type of converter called a single-phase Z-source buck–boost matrix converter. The converter can buck and boost with step-changed frequency, and both the frequency and the voltage can be stepped up or stepped down. In addition, the converter employs a safe-commutation strategy to conduct along a continuous current path, which results in the elimination of voltage spikes on switches without the need for a snubber circuit. The operating principles of the proposed single-phase Z-source buck–boost matrix converter are described, and a circuit analysis is provided. To verify the performance of the proposed converter, a laboratory prototype was constructed with a voltage of 40 Vrms /60 Hz and a passive RL load. The simulation and the experimental results verified that the converter can produce an output voltage with three different frequencies 120, 60, and 30 Hz, and that the amplitude of the output voltage can be bucked and boosted.

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A Single-Phase Z-Source Buck–Boost Matrix Converter
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ABSTRACT:
This paper proposes a new type of converter called a single-phase Z-source buck–boost matrix
converter. The converter can buck and boost with step-changed frequency, and both the
frequency and the voltage can be stepped up or stepped down. In addition, the converter employs
a safe-commutation strategy to conduct along a continuous current path, which results in the
elimination of voltage spikes on switches without the need for a snubber circuit. The operating
principles of the proposed single-phase Z-source buck–boost matrix converter are described, and
a circuit analysis is provided. To verify the performance of the proposed converter, a laboratory
prototype was constructed with a voltage of 40 Vrms /60 Hz and a passive RL load. The
simulation and the experimental results verified that the converter can produce an output voltage
with three different frequencies 120, 60, and 30 Hz, and that the amplitude of the output voltage
can be bucked and boosted.
KEYWORDS:
1. Buck–boost voltage
2. single-phase matrix converter
3. step-up and step-down frequency
4. Z-source converter
SOFTWARE: MATLAB/SIMULINK

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BLOCK DIAGRAM:
Fig.1. General block diagram of the proposed topology.
EXPECTED SIMULATION RESULTS:
Fig. 2. Simulated result at 120-Hz frequency with D = 0.3 in boost mode. Fig. 3. Simulated result at 60-Hz frequency with D= 0.3 in
(Top) Input voltage vi (60 Hz). (Center) Input current ii . (Bottom) Output boostmode. (Top) Input voltage vi (60 Hz). (Center) Input current ii .
voltage vo (120 Hz). (Bottom) Output voltage vo (60 Hz).

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Fig. 4. Simulated result at 30-Hz frequency with D = 0.3 in boost mode. Fig. 5. Experimental result at frequency of 120 Hz (top: vi (60 Hz)
(Top) Input voltage vi (60 Hz). (Center) Input current ii . (Bottom) (100 V/ division); center: ii (5 A/division); bottom: vo (120 Hz)
Output voltage vo (30 Hz). (100 V/division ). Time: 4 ms/division.
Fig. 6. Experimental result at frequency of 60 Hz (top: vi (60 Hz) Fig. 7. Experimental result at frequency of 30 Hz (top: vi (60 Hz)
(100 V/ division); center: ii (5 A/division); bottom: vo (60 Hz) (100 V/ division); center: ii (5 A/division); bottom: vo (30 Hz)
(100 V/division). Time: 4 ms/division. (100 V/division ). Time: 4 ms/division.
Fig. 8. Measured output voltage gain (K) versus duty cycle Fig. 9. Voltage waveforms of S3b with D = 0.3 in boost mode. (a)
(D) at three different output frequencies in boost mode. (a)Time scale: 4 ms/division. (b) Time scale: 10 μs/division. (Top)
VGE of S3b (10 V/division). (Bottom) VCE of S3b (100 V/division).
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CONCLUSION:
In this paper, we have proposed a new single-phase Z-source buck–boost matrix
converter that can buck and boost to the desired output voltage with step-changed frequency. The
output of this single-phase Z-source buck–boost matrix converter produces the voltage in buck–
boost mode with a step-changed frequency, in which the output frequency is either an integer
multiple or an integer fraction of the input frequency. It also provides a continuous current path
by using a commutation strategy. The use of this safe-commutation strategy is a significant
improvement as it makes it possible to avoid voltage spikes on the switches without the use of a
snubber circuit. We presented a steady-state circuit analysis and described the operational stages.
To verify the performance of the proposed converter, we constructed a laboratory prototype with
an input voltage of 40 Vrms (57 Vpeak)/60 Hz based on TMS320F2812 DSP, and we performed
a PSIM simulation.
The simulation and the experimental results with a passive RL load showed that the
output voltage can be produced at three different frequencies, 120, 60, and 30 Hz, and in the
buck–boost amplitude mode. Because of limitations in the power laboratory setup, the prototype
was intended only to verify the operational concept. We expect that this proposed strategy can be
used in various industrial applications that require step-changed frequencies and variable voltage
amplitudes. The proposed converter is particularly suitable for controlling the speed of a fan or a
pump without the use of an inverter because for these applications, the input voltage frequency
must be changed to control their speed by stages.

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