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The most concerns in the inverter's design are about, how to make the output voltage of the inverter sinusoidal at the desired fundamental frequency with low total harmonic distortion (THD). This paper presents a design and implementation of single-phase five-level inverter which is powered by single dc source and based on T-type multi-level invert...
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Context 1
... test the working possibility of the inverter's circuit by using simulation tools, the proposed inverter is simulated by using MATLAB SIMULINK R2017a. All the carries, reference signals, and square wave signals are generated then; the logic circuit is made according to the comparisons that are made among all of these signals as explained in the previous section of this paper. This is to get the required pulses for the six IGBT switches. Fig 5 shows the simulated output voltage of the inverter. The THD of the output voltage of the inverter is also calculated which is 3.46% as shown in Fig 6, and the calculated THD is made without adding any filters at the output side of the inverter, where the aim in this design is to get the possible lower THD of the inverter's output voltage without filters then the filter can be added later but with a reduction in its size. For balanced carriers' amplitudes, the THD is 3.95% if the condition of over-modulation is used. ...
Context 2
... 5 shows the simulated output voltage of the inverter. The THD of the output voltage of the inverter is also calculated which is 3.46% as shown in Fig 6, and the calculated THD is made without adding any filters at the output side of the inverter, where the aim in this design is to get the possible lower THD of the inverter's output voltage without filters then the filter can be added later but with a reduction in its size. For balanced carriers' amplitudes, the THD is 3.95% if the condition of over-modulation is used. ...
Context 3
... 5 shows the simulated output voltage of the inverter. The THD of the output voltage of the inverter is also calculated which is 3.46% as shown in Fig 6, and the calculated THD is made without adding any filters at the output side of the inverter, where the aim in this design is to get the possible lower THD of the inverter's output voltage without filters then the filter can be added later but with a reduction in its size. For balanced carriers' amplitudes, the THD is 3.95% if the condition of over-modulation is used. ...
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Citations
... A small modification of the seven-level T-MLI was previously performed, where five levels were proposed by [32,33]. In this design, blocking diodes D5 to D8 are added to secure unwanted current flow and reduce the output voltage ripple as well as its harmonics, as shown in Figure 3. ...
Multilevel inverters (MLI) consist of a wide range of power converters. They have many designs and have been introduced with different circuit topologies such as neutral point clamped, diode clamped, cascaded H-bridges, and flying capacitors. Some of these MLIs have disadvantages, including design complexity, size, and losses due to the large number of switching devices required when they produce many output voltage levels. They are also bulky in size and may require several DC power sources. This paper presents a review of the various topologies of single‑phase T-Type MLIs (T-MLIs). These MLIs are used to convert DC power from renewable energy sources (RES)” into AC with a near-sine waveform and low total harmonic distortion (THD). Simple and complex MLI designs are discussed. The major types of modulation techniques are discussed, including sinusoidal pulse width modulation (SPWM), selective harmonic elimination (SHE), and preprogrammed PWM. Various methods of output voltage control are taken into consideration as well. The aim of this comprehensive survey is to identify T-MLIs for researchers and those interested in the power conversion field, as well as to discuss the many topologies, identifying designs with superior characteristics that can be efficiently implemented with RESs to obtain better AC voltage with enhanced power quality.
