A Low-Noise Three-Phase Sine Wave Inverter Based on a Novel Principle of Waveform Synthesizing

本研究的目的是研制一种具有极低噪声和极低失真输出波形的三相逆变器。研究结果如下：(1)提出了两种新型的逆变系统。我们开发了两种新颖的逆变系统方案，即电流型方案和电压型方案。这两种方案都具有高频(HF)谐振逆变器和低频(LF)逆变器，以显示直流纹波电流或电压。高频和低频逆变器在零电压或零电流时通断。因此，两种方案都具有很低的噪声特性。(2)一种输出正弦波电流的高频环节双变流器三相逆变器系统。该系统具有高频环节的特点，从而减轻了隔离变压器的体积和重量。该系统适用于光伏发电系统中的功率变流器。(3)具有正弦波电压输出的双变流器三相逆变系统。虽然该系统与传统系统一样需要低频输出变压器，但该系统具有易于扩展到更多多路系统的特点。这样就可以得到噪声极低、输出波形良好的大容量功率变流器。

The purpose of this study is that we develop a three-phase inverter with very low noise and very low distorted output waveforms. The results obtained are as follows:(1) Two novel-scheme inverter systems. We have developed two novel-scheme inverter system, i.e. a current-source scheme and a voltage-source scheme. Both schemes have high-frequency (HF) resonant inverters and low-frequency (LF) inverters to unfold dc ripple current or voltage. The HF and LF inverters turn-on and -off at zero voltage or current. Then, the both schemes have very low-noise characteristics.(2) A high-frequency link dual-converter type three-phase inverter system with sine wave current outputs. The system has the feature of a high frequency link which provides the reduction of the size and weight of isolation transformers. The system is suitable for power converters of photovoltaic power generation systems.(3)A dual-converter type three-phase inverter system with sine wave voltage outputs. Although the system requires low-frequency output transformers like conventional systems, the system has the feature of easy expansion to more multiplex systems. Then, we can get large capacity power converters which have the feature of very-low noise and excellent output waveform.