A large device count, weak boosting capability, and DC voltage imbalance are common issues in conventional multilevel inverters. In this paper, a novel multilevel inverter is presented that can generate the desired number of output levels with reduced devices by using new switched-capacitor circuits (SCCs). The two input sources and capacitors in the SCC can be switched in parallel and series modes. In the parallel mode, the capacitor voltage of the SCC is charged to the DC source voltage, which inherently solves the capacitor voltage imbalance issue without any auxiliary circuits. In the series mode, the capacitor can be used as an alternative source, which helps achieve a high voltage gain. The multiple input sources of the SCC make the proposed topology suitable for application in renewable energy generation systems where several DC sources are available. Instead of an H-bridge module, a structure with two half-bridges and two switches is used as a polarity generation circuit at the load terminal. The input sources of two SCCs can be selected as symmetric and asymmetric patterns, which can result in a great number of output voltage levels. The circuit topology, operational principle, modulation strategy, capacitor analysis, and performance comparisons of the inverter are described in this paper. In addition, experimental results verify the feasibility and validity of the inverter.

在常规的多电平逆变器中，器件数量大，升压能力弱和直流电压不平衡是常见问题。在本文中，提出了一种新颖的多电平逆变器，该逆变器可以通过使用新的开关电容器电路（SCC）以减少的设备生成所需数量的输出电平。SCC中的两个输入源和电容器可以并联和串联模式切换。在并联模式下，SCC的电容器电压被充电到直流电源电压，这从根本上解决了电容器电压不平衡的问题，而无需任何辅助电路。在串联模式下，电容器可用作替代电源，有助于实现高电压增益。SCC的多个输入源使拟议的拓扑适合于可使用多个直流电源的可再生能源发电系统。代替H桥模块，在负载端子上使用具有两个半桥和两个开关的结构作为极性生成电路。可以将两个SCC的输入源选择为对称和非对称模式，这会导致大量的输出电压电平。本文介绍了逆变器的电路拓扑，工作原理，调制策略，电容器分析以及性能比较。另外，实验结果验证了该逆变器的可行性和有效性。可以将两个SCC的输入源选择为对称和非对称模式，这会导致大量的输出电压电平。本文介绍了逆变器的电路拓扑，工作原理，调制策略，电容器分析以及性能比较。另外，实验结果验证了该逆变器的可行性和有效性。可以将两个SCC的输入源选择为对称和非对称模式，这会导致大量的输出电压电平。本文介绍了逆变器的电路拓扑，工作原理，调制策略，电容器分析以及性能比较。另外，实验结果验证了该逆变器的可行性和有效性。