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Development of a large-capacity high-efficiency ac/dc power conversion system complying with harmonic guidelines

开发符合谐波准则的大容量高效交流/直流电源转换系统

基本信息

批准号：
09555087
负责人：
AKAGI Hirofumi
金额：
$ 8.19万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Large-capacity pulse-width-modulated (PWM) rectifiers consisting of the same power circuit topology as PWM inverters have shown promise in meeting the harmonic guidelines enacted on Oct. 3, 1994. The increased cost and switching loss caused by PWM, however, would make a high-power PWM rectifier rated at 1-10 MW economically impractical. The reason is that GTO thyristors of IGBT's used for the PWM rectifier are subjected to high-frequency switching of the full amount of active power.The authors propose a new ac/dc power conversion system providing a solution to the abovementioned problems hidden in PWM rectifiers. A small-rated series active filter for the purpose of achieving harmonic compensation is integrated with a large-rated double-series diode rectifier for the propose of performing ac/dc power conversion. An ac/dc power conversion system consisting of a 20-kVA diode rectifier and 0.2-kVA series active filter has been designed and constructed to verify the practical viability and justification by experiment. Based on experimental results obtained from the laboratory system, along with theoretical results, this research is summarized as follows.・ A delay time as short as 40μs may make the active filter unstable when the ac/dc power conversion system is installed on a "stiff" power system.・ The authors propose and evaluate a new configuration of the harmonic extraction circuit capable of eliminating the effect of delay time on the system stability.・ A switching-ripple filter is designed and tested. The effect of the filter on the system stability is also discussed theoretically and experimentally.

由与PWM逆变器相同的功率电路拓扑结构组成的大容量脉宽调制（PWM）整流器在满足1994年10月3日颁布的谐波准则方面表现出了希望。然而，由PWM引起的增加的成本和开关损耗将使得额定为1-10 MW的大功率PWM整流器在经济上不切实际。本文提出了一种新的AC/DC功率变换系统，解决了PWM整流器中存在的上述问题。为了实现AC/DC功率变换，将一个小额定值的串联有源滤波器与一个大额定值的双串联二极管整流器集成在一起，以实现谐波补偿。一个AC/DC电源转换系统，由一个20-kVA的二极管整流器和0.2-kVA的串联有源滤波器已被设计和建造，以验证实际的可行性和理由，通过实验。基于实验室系统获得的实验结果，沿着理论结果，本研究总结如下。·当AC/DC电源转换系统安装在“刚性”电源系统上时，短至40μs的延迟时间可能会使有源滤波器不稳定。·作者提出并评估了一种新的谐波提取电路的配置，能够消除延迟时间对系统稳定性的影响。设计并测试了一种开关纹波滤波器。文中还从理论和实验上讨论了滤波器对系统稳定性的影响。