High power low-loss resonant-type multi-level inverter

Recently, introduction of renewable energy such as photovoltaics and wind energy has gained precedence for greenhouse gas reduction and oil substitution. However, due to the power fluctuation of renewable energy sources, voltage and frequency deviation are problematic in power systems. At present, a transformerless battery energy storage system based on a cascaded multilevel converter has been proposed. The system can be reduced the size, the weight, and the cost of energy storage system for transformerless. However, the cascaded multi-level inverter requires a number of switching devices, and the switching loss and electromagnetic interference (EMI) noises is occurred. This paper presents a high power low-loss resonant-type multi-level inverter. By using the proposed method, the switching losses and EMI noises can be suppressed. The effectiveness of the proposed method is performed by using PSIMR^®.