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首页> 外文期刊>Sustainable Energy, IEEE Transactions on >A New Asymmetric Multilevel Inverter Topology Suitable for Solar PV Applications With Varying Irradiance
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A New Asymmetric Multilevel Inverter Topology Suitable for Solar PV Applications With Varying Irradiance

机译：一种适用于变化辐照度的太阳能光伏应用的新型不对称多电平逆变器拓扑

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摘要

A new asymmetrical multilevel inverter topology is reported that is capable to operate satisfactorily with wide variation in dc-link voltage, while feeding power to the ac grid. A topological building block is first introduced that has one full-bridge inverter connected in series with a level doubling network. Following this, the interconnection of such building blocks is attempted to increase the number of levels at the output voltage waveform. The investigation reveals that for a three-phase system, a converter configuration with two such building blocks is capable to generate a nominal asymmetry of 14:7:2:1 using only four voltage sources. In solar Photovoltaic (PV) applications, one main source may be fed by PV array and the other three auxiliary sources may be fed through separate dc/dc converters, each having power rating of 3.2% of the peak power rating of PV arrays. The proposed converter can generate 3097 space vectors. Asymmetrical hexagonal decomposition is modified (to ensure satisfactory operation of LDN and to eliminate any dc component in the phase voltage waveform) to control such converter. The converter is extensively simulated in MATLAB/Simulink. A solar PV system of 9.4 kWp available in the laboratory is used to feed power to the grid at different irradiance. Simulation results match well with the prototype experiments confirming the usefulness of the proposed topological alternative for solar PV applications.
机译：据报道，一种新的非对称多电平逆变器拓扑能够在直流链路电压变化很大的情况下令人满意地运行，同时为交流电网供电。首先介绍一种拓扑结构块，该拓扑块具有一个与电平倍增网络串联的全桥逆变器。此后，尝试进行此类构建模块的互连以增加输出电压波形处的电平数。研究表明，对于三相系统，仅使用四个电压源，具有两个此类构建模块的转换器配置就可以产生14：7：2：1的标称不对称性。在太阳能光伏（PV）应用中，一个主电源可以由PV阵列供电，而其他三个辅助电源可以通过单独的dc / dc转换器供电，每个转换器的额定功率为PV阵列峰值功率的3.2％。提出的转换器可以生成3097个空间矢量。修改了不对称六边形分解（以确保LDN令人满意地运行并消除相电压波形中的任何直流分量）以控制此类转换器。该转换器在MATLAB / Simulink中进行了广泛的仿真。实验室可用的9.4 kWp太阳能光伏系统用于在不同辐照度下向电网供电。仿真结果与原型实验非常吻合，证实了所提出的拓扑替代方案对于太阳能光伏应用的有用性。

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