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Comparison and performance analysis of unipolar and bipolar digitally-controlled single-phase inverters

机译：单极和双极数控单相逆变器的比较和性能分析

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摘要

Inverter is substantially an interface between DC source like photovoltaic cell and AC networks. There are many doable inverter topologies and switching schemes, and each one will have its own relative benefits and downsides. Efficiency and output current distortion are two necessary factors governing the selection of inverter system. In this paper, two inverter switching strategies are explored. These are the unipolar and bipolar current controlled inverter employing both the SPWM (Sinusoidal Pulse Width Modulation) and the THPWM (Third Harmonic Pulse Width Modulation) techniques. The models of these techniques are simulated using MATLAB-Simulink software. Simulation results are compared with results of an experimental prototype to confirm validity of results. The results are taken for both static and dynamic loads with different modulation index. Both simulated and experimental results are in a good agreement. The results showed that the unipolar switched inverter offers low current distortion over bipolar switched inverter.
机译：逆变器实质上是像光伏电池这样的直流电源和交流网络之间的接口。逆变器拓扑结构和开关方案很多，每种方案都有其相对的优点和缺点。效率和输出电流失真是控制逆变器系统选择的两个必要因素。本文探讨了两种逆变器切换策略。它们是采用SPWM（正弦脉冲宽度调制）和THPWM（三次谐波脉冲宽度调制）技术的单极性和双极性电流控制逆变器。这些技术的模型是使用MATLAB-Simulink软件进行仿真的。将模拟结果与实验原型的结果进行比较，以确认结果的有效性。结果是针对具有不同调制指数的静态和动态负载得出的。模拟结果和实验结果均吻合良好。结果表明，单极性开关逆变器比双极性开关逆变器具有较低的电流失真。

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