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In the field of medium and high- power application, multilevel inverters have emerged as an attractive choice. From the simulation and experimental results it is confirmed that the harmonic distortion of the output current waveform of the inverter fed to the grid is within the stipulated limits laid down by the utility companies. Simulation and experimental results of grid- connected inverter are presented. The techniques developed and presented in this paper are readily applicable to other currently available Xilinx chips. All the necessary Xilinx hardware/software techniques and programs required to implement and generate three-phase Pulse Width Modulation ( PWM) are developed in detail, and demonstrated using practical results from an experimental Xilinx board. It is digitally implemented on a Xilinx field programmable gate array FPGA, and the essential considerations involved in the feasibility of using a Xilinx XC4008E software-based to generate PWM has been discussed. Moreover, suitable control scheme is necessary to deal with different operating conditions and uncertainties in the network due to the parameters or load variations.Ībstract Analysis and practical implementation of the regular symmetric sampled three-phase PWM inverter waveform has been presented in this paper. An aptitude for easy digital implementation is the notable feature of space vector modulation, which can be easily implemented in digital signal processor (DSP). This modulation, instead of using a separate modulator for each of the three phases, the complex reference voltage vector is processed as a whole. The space vector PWM (SVPWM) has been increasingly used in last decade. In this method a triangular wave is compared to a sinusoidal wave. The sinusoidal PWM (SPWM) is matured technology. There are several techniques for controlling semiconductors' converter each one has its own advantages and disadvantages. The switching elements are power semiconductors that operate at high frequencies. These devices have as their main component a voltage source converter, which uses pulse width modulation ( PWM) for controlling purposes. The load taken here is resistive and inductive (RL). This method is popularly used in speed control of three phase induction motors. In this way the output voltage is controlled and THD also reduces significantly with the increase in efficiency of the inverter. The width of the pulses are modulated to provide gate signals to the switches (IGBTs) connected in the inverter.
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In SPWM technique, the amplitude is constant but the width of the pulse varies by changing the duty cycle for each period. The output phase and line voltages are observed in scope along with their Total Harmonic Distortion (THD) which varies with modulation index. The modulation index is varied from 0.4 to 1 by changing the amplitude of the modulating signal.
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The carrier wave (triangular) is compared to the reference (sine wave), whose frequency is the desired frequency. The load taken here is resistive and inductive (RL).ĪBSTRACT: This paper presents the simulation of three phase voltage switching inverter in MATLAB/ Simulink using Sinusoidal Pulse Width Modulation (SPWM) scheme. This paper presents the simulation of three phase voltage switching inverter in MATLAB/ Simulink using Sinusoidal Pulse Width Modulation (SPWM) scheme. The Sinusoidal Pulse Width Modulation (SPWM) technique is one of the most popular PWM techniques for harmonic reduction of inverters since there are used three sine waves displaced in 1200 phase difference as reference signals for three phase inverter. Inverter is the most important device to utilize the renewable energy sources efficiently.