Comparing the performance of bipolar and unipolar switching frequency to drive DC-AC Inverter

2016 International Renewable and Sustainable Energy Conference (IRSEC) Pub Date : 2016-11-01 DOI:10.1109/IRSEC.2016.7984067

A. Algaddafi, K. Elnaddab, Abdullah Al Ma'mari, A.N. Esgiar

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引用次数: 11

Abstract

The inverter is a device that is used as an interface between the photovoltaic energy and the grid. The harmonic and distortion of the output current, and efficiency of the inverter are the main issues. This paper presents a model of Sinusoidal Pulse Width Modulation (SPWM) methods of unipolar and bipolar inverters in MATLAB and Psim software. A numerical model of the LC filter is derived in order to design and test the DC-AC inverter. The SPWM control is created by comparing triangle signal (a carrier waveform) and a reference signal (a sine waveform) whose frequency is the desired frequency. The simple circuit is used to characterize the scheme of SPWM techniques in order to obtain the pure output voltage and reduce the harmonic component. Empirical results show that the unipolar switching scheme is used in widespread a commercial PV inverter in order to have the flexibility to choose a filter and reduce the harmonic components. The switching frequency of the Sunny Boy inverter is found around 15 kHz and its transformer is estimated. Unipolar switching SPWM is very useful in low switching frequency than bipolar switching SPWM. The output voltage and current in both techniques have been analyzed in frequency and time domains.

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比较双极和单极开关频率驱动直流-交流逆变器的性能

逆变器是作为光伏能源与电网之间的接口装置。逆变器输出电流的谐波和畸变以及逆变器的效率是主要问题。本文在MATLAB和Psim软件中建立了单极和双极逆变器正弦脉宽调制方法的模型。为了设计和测试直流-交流逆变器，推导了LC滤波器的数值模型。SPWM控制是通过比较三角信号(载波波形)和参考信号(正弦波形)来创建的，其频率是期望的频率。为了获得纯输出电压和降低谐波分量，采用简单的电路对SPWM技术方案进行了表征。实验结果表明，单极性开关方案在商用光伏逆变器中广泛应用，可以灵活地选择滤波器，减少谐波分量。Sunny Boy逆变器的开关频率约为15 kHz，其变压器估计。单极开关SPWM在低开关频率下比双极开关SPWM更有用。对两种技术的输出电压和电流进行了频域和时域分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 International Renewable and Sustainable Energy Conference (IRSEC)

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