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L-C filter design implementation and comparative study with various PWM techniques for DCMLI

机译：DCMLI的L-C滤波器设计实现和各种PWM技术的比较研究

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摘要

In recent time's multi-level inverters are widely used in industrial application, grid integration, renewable system, buildings and smart grid technology, etc. Uninterruptible power supply has become indispensable to our society. Concern with power quality and grid integration, a pure sinusoidal voltage-current waveform is necessary. For such reason a design of various filters is now emerged in research area. Filters have property to smooth current and voltage waveform. This paper proposes filter design guideline for L-C filter with IGBT based multi-level inverter. An L-C circuit used at the inverter output for filtering purposes and ensuring that the THD is lower. The L-C filter cancels all harmonics and a real pure sinusoidal output voltage and current is obtained. Variable voltage and frequency supply to A.C. drives is invariably obtained from a three-phase voltage source inverter. A various pulse width modulation (PWM) schemes are used. The most widely used PWM schemes for three-phase voltage source inverters are carrier-based sinusoidal PWM (SPWM) and space vector PWM (SVPWM). In this paper a method for an asynchronous motor with inverter and L-C output filter is presented and it is verified by simulations in Matlab-Simulink. The simulation results are presented for three-phase five-level diode clamped inverter followed by three-phase L-C filter. The simulation results are compared with sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) for diode clamped multilevel inverter (DCMLI) in terms of THD.
机译：近年来，多电平逆变器已广泛应用于工业应用，电网集成，可再生系统，建筑和智能电网技术等。不间断电源已成为我们社会不可缺少的电源。考虑到电能质量和电网整合，纯正弦电压电流波形是必要的。因此，在研究领域出现了各种滤波器的设计。滤波器具有平滑电流和电压波形的特性。本文提出了基于IGBT的多电平逆变器的L-C滤波器的滤波器设计指南。 L-C电路在逆变器输出端用于滤波目的，并确保THD较低。 L-C滤波器消除了所有谐波，并获得了真正的纯正弦输出电压和电流。交流电压驱动器的可变电压和频率供应总是从三相电压源逆变器获得。使用了各种脉冲宽度调制（PWM）方案。三相电压源逆变器使用最广泛的PWM方案是基于载波的正弦PWM（SPWM）和空间矢量PWM（SVPWM）。本文提出了一种带有逆变器和L-C输出滤波器的异步电动机的方法，并通过Matlab-Simulink中的仿真进行了验证。给出了三相五电平二极管钳位逆变器和三相L-C滤波器的仿真结果。将仿真结果与THD方面的二极管钳位多电平逆变器（DCMLI）的正弦脉冲宽度调制（SPWM）和空间矢量脉冲宽度调制（SVPWM）进行了比较。

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