In this article, a modified single-phase five-level photovoltaic inverter is proposed with a single DC voltage source and six semiconductor switches. Compared with the presented inverters, the introduced topology has the advantage of decreased device count and the first switching frequency for high blocking voltage switches. The proposed PV inverter is implemented without clamping diodes and transformers, which leads to a decrement in size and, consequently, the weight of the converter. In addition, for the proposed topology, space vector pulse width modulation (SVPWM) is deployed that reduces the complexity of multilevel modulation. In order to obtain the optimal output voltage of the inverter, the deadbeat controller is suggested as a rapid dynamic, low-computation digital control method. This closed-loop inverter is implemented in TMS320f28335 digital signal controller to evaluate the performance of the proposed inverter under nonlinear and linear loads. Simulation and laboratory prototype results show that IEC 62040-3 harmonic constraints is met for the proposed photovoltaic inverter in standalone applications.

中文翻译：

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具有减少的开关数量的改良型单相五电平光伏逆变器的无差拍控制

在本文中，提出了一种具有单个直流电压源和六个半导体开关的改进型单相五电平光伏逆变器。与提出的逆变器相比，引入的拓扑具有减少设备数量和高阻断电压开关的第一开关频率的优势。所提出的PV逆变器在没有钳位二极管和变压器的情况下实现，这导致尺寸减小，并因此减小了转换器的重量。此外，对于提出的拓扑，部署了空间矢量脉冲宽度调制（SVPWM），可降低多级调制的复杂性。为了获得逆变器的最佳输出电压，建议将无差拍控制器作为一种快速的动态，低计算量的数字控制方法。该闭环逆变器在TMS320f28335数字信号控制器中实现，以评估所提出的逆变器在非线性和线性负载下的性能。仿真和实验室原型结果表明，提出的光伏逆变器在独立应用中可以满足IEC 62040-3的谐波约束。