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软开关三电平逆变器(soft switching three-level inverter，S3L)于2011年首次推出。它代表了脉宽调制(pulse width modulation，PWM)逆变器的一种新的拓扑结构，应用于电力驱动，光伏和风力发电厂的并网逆变器，以及用于供电领域。因其结构非常简单，所以价格相当低廉。它完全在软切换模式下运行，并且持续表现出极低的切换损耗。其结果是，效率非常高，而且可以实现特别高的切换频率。该论文对其功能进行描述，还展示一部输出电源为20~90 kVA 的逆变器样品，并对测试结果作详细说明。“,” The Soft Switching Three Level Inverter (S3L) was first presented in 2011. It represents a novel topology for pulse width modulation (PWM) inverters that are used in electrical drives, in grid supply inverters for photovoltaic and wind power plants and for power supplies. It has a rather simple structure and is thus economically priced. It is completely operated in soft switching mode and consequently only displays very low switching losses. As a result, the efficiency rate is very high and particularly high switching frequency values can be achieved. In the present paper, the functionality is described, prototypes with output power from 20 kVA to 90 kVA are presented and results are specified.