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A multilevel converter can toggle either its input or output nodes (or both) between many (more than two) levels of voltage or current. The THD in output become zero when the number of levels reaches to infinity. By the reason of voltage-imbalance problems, voltage clamping requirements, circuit outline, capital and maintenance cost the number of voltage levels can be bound.
1.2 Advantages of Multilevel Inverter
A multilevel inverter has many advantages over conventional two-level inverter which are used high switching frequency pulse width modulation (PWM). The advantages features of a multilevel inverter can be explained as follows.
a. Switching frequency: Multilevel inverter be able to operate at both fundamental switching frequency*…show more content…*

The overall system to be more expensive and complex due to complex circuit. c. It has the voltage balancing problem. d. It has complex pulse width modulation control method. 1.4 Applications of Multilevel Inverter There are many applications of multilevel inverter, are given as follows. a. Multilevel power inverters have been used for dc to ac power conversion in high power application such as large motor drive applications and high-voltage dc transmission system. b. The most common initial application of multilevel converters has been in traction. c. More recent applications have been for power system converters for VAR compensation, stability enhancement and active filtering. d. It also applicable for medium voltage induction motor variable speed drives. 1.5 Proposed Multilevel Inverter*…show more content…*

1.3 shows the basic block diagram of proposed topology using multilevel inverter. In this the output voltage is divided into two parts. The first one is level generation part and other is full bridge converter part. Level generation branch generates the required output level and full bridge converter decides about the two different polarity are positive and negative polarity of the output voltage. Each inverter, level can be generate three different output voltage, +Vdc, -Vdc and zero. The AC outputs of different full-bridge converters in the same phase are connected in series such that the synthesized voltage waveform is the addition of the individual converter outputs. In this topology, the number of output-phase voltage levels is defined by m= 2N+1, where N is the number of DC sources. A 9-level proposed multilevel inverter, for example, consists of four DC sources and 10 semiconductor switches. Minimum harmonic distortion can be obtained by controlling the conducting angles at different converter levels. Each H- bridge unit generates a quasi-square waveform by phase shifting its positive and negative phase legs switching

The overall system to be more expensive and complex due to complex circuit. c. It has the voltage balancing problem. d. It has complex pulse width modulation control method. 1.4 Applications of Multilevel Inverter There are many applications of multilevel inverter, are given as follows. a. Multilevel power inverters have been used for dc to ac power conversion in high power application such as large motor drive applications and high-voltage dc transmission system. b. The most common initial application of multilevel converters has been in traction. c. More recent applications have been for power system converters for VAR compensation, stability enhancement and active filtering. d. It also applicable for medium voltage induction motor variable speed drives. 1.5 Proposed Multilevel Inverter

1.3 shows the basic block diagram of proposed topology using multilevel inverter. In this the output voltage is divided into two parts. The first one is level generation part and other is full bridge converter part. Level generation branch generates the required output level and full bridge converter decides about the two different polarity are positive and negative polarity of the output voltage. Each inverter, level can be generate three different output voltage, +Vdc, -Vdc and zero. The AC outputs of different full-bridge converters in the same phase are connected in series such that the synthesized voltage waveform is the addition of the individual converter outputs. In this topology, the number of output-phase voltage levels is defined by m= 2N+1, where N is the number of DC sources. A 9-level proposed multilevel inverter, for example, consists of four DC sources and 10 semiconductor switches. Minimum harmonic distortion can be obtained by controlling the conducting angles at different converter levels. Each H- bridge unit generates a quasi-square waveform by phase shifting its positive and negative phase legs switching

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