Development of Utilization System of Electric Power Frequency Using Static Induction Functional Devices

本课题研究的目的是开发一种电力频率利用系统，能够将电力频率任意转换并作为资源加以利用，目前电力线路的频率是50 Hz或60 Hz。然而，一些电力设备需要不同的频率。例如，由于交流电动机的旋转速度由电源的频率决定，所以需要变频电源以变速驱动交流电动机。如果可以在FA工厂和/或智能建筑等局部地区的电力储备系统中安装功率变换器，则可以通过将电源频率提高到400 Hz来减小变压器的尺寸和重量。电力电子技术可以利用功率半导体的开关功能来实现电力的转换和控制。由电压和电流的强制接通/关断引起的开关功率损耗使得传统变换器的开关频率相对较低。为了解决开关损耗问题，本计画研制了一种谐振式功率转换器。向功率转换器添加谐振电路产生电压涟漪，其允许在低电压定时进行无功率损耗切换。本课题研制的谐振式功率变换器具有很高的效率。

This project have been studied aiming to develop the utilization system of electric power frequency, Which could convert electric power frequency arbitrary and utilize it as resources.The frequency of utility power line is constant of 50Hz or 60Hz up to the present. Some power equipments, however, require different frequencies. For examples, since the rotational speed of an ac motor is determined by the frequency of power supply, the variable frequency power supply is necessary to drive the ac motor in variable speed. If it is possible to install power converters in power reseruing systems of local areas such as FA works and/or intelligent buildings, the size and weight of transformers can be reduced by increasing the power frequency up to 400Hz.The conversion and control of electric power can be achieved by power electronic technology which makes use of switching function of power semiconductors. The switching power loss caused by forcible switching on/off of voltage and current makes the switching frequency of conventional converters relatively low. In order to resolve the switching loss Problem, a resonant type power converter has been developed in this project. The addition of a resonant circuit to the power converter produces the voltage ripple which permits power loss free switching at low voltage timing. The resonant power converter developed in this project has very high effeciency.