Modelling of grid tied 3-level diode clamped inverter using space vector PWM for PV system

P. Joshi, C. Sheth
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引用次数: 2

Abstract

In this work the AC Load is fed from solar radiation energy by means of Three-level Diode-Clamped Inverter. The entire system is implemented with three phase supply system. For making the system more efficient, Maximum Power Point Tracking (MPPT) device is used. The Perturb & Observe technique is adopted to obtain voltage at maximum power. In this paper, Space Vector Pulse Width Modulation (SVPWM) technique is used to generate gate pulses to make inverter switches ON and OFF periodically. IGBTs are used as a switching device. With the help of latest new vectors, the new gate pulses are generated and the system is interfaced with Grid. Without a filter, the %THD of line voltage is 32.24% and with the incorporation of filter in the system the %THD of line voltage drastically reduces to 4.91%. The modelling of the entire system is performed through MATLAB/Simulink in this work The paper also presents the comparison of the results of line voltages for the proposed system with Sinusoidal Pulse Width Modulation (SPWM) and SVPWM techniques.
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基于空间矢量PWM的并网三电平二极管箝位逆变器建模
在此工作中,交流负载通过三电平二极管箝位逆变器从太阳辐射能中馈入。整个系统采用三相供电系统。为了提高系统的效率,采用了最大功率点跟踪(MPPT)装置。采用扰动观测技术获得最大功率时的电压。本文采用空间矢量脉宽调制(SVPWM)技术产生栅极脉冲,使逆变器开关周期性地通断。igbt用作开关器件。利用最新的矢量生成新的栅极脉冲,并与栅格接口。在不加滤波器的情况下,线路电压的%THD为32.24%,在系统中加入滤波器后,线路电压的%THD大幅降低到4.91%。本文通过MATLAB/Simulink对整个系统进行了建模,并比较了正弦脉宽调制(SPWM)和SVPWM技术对系统电压的影响。
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