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

本研究的目的是开发一种具有极低噪声和极低失真输出波形的三相逆变器。主要研究结果如下：（1）两种新颖的逆变系统方案。我们开发了两种新颖的逆变系统方案，即电流源方案和电压源方案。这两种方案都有高频（HF）谐振逆变器和低频（LF）逆变器来展开直流涟漪电流或电压。HF和LF逆变器在零电压或零电流下开启和关闭。因此，这两种方案都具有非常低的噪声特性。(2)一种具有正弦波电流输出之高频链双变流器式三相逆变器系统。该系统具有高频链路的特征，其提供了隔离变压器的尺寸和重量的减小。该系统适用于光伏发电系统的功率变换器。(3)A双变流器式三相逆变器系统，输出正弦波电压。虽然该系统像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复用系统的特点。这样就可以得到噪声极低、输出波形优良的大容量功率变换器。

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.