Power electronic transformers for utility applications
Power electronic transformers for utility applications
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DOI：
10.1109/ias.2000.883173
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发表时间：
2000-10
期刊：
影响因子：
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通讯作者：
M. Manjrekar;Rick Kieferndorf;G. Venkataramanan
中科院分区：
文献类型：
--
作者：
M. Manjrekar;Rick Kieferndorf;G. Venkataramanan
实现小尺寸“固态”变压器的概念已经讨论了一段时间。为传统整流-逆变系统供电的变压器实现尺寸减小的一个相当直接的方法是在直流链路中引入一个隔离的DC-DC转换器，隔离由高频变压器提供。因此，文献中也报道了几种采用高频变压器初级和次级侧连接的交流-交流转换器的拓扑结构，以减少磁芯的尺寸和重量。这种交流-交流变换器需要具有双向压阻和载流能力的开关，通常通过对栅极关断器件如绝缘栅双极晶体管（IGBT）来实现。本文探讨了采用交流-交流开关模式电源变换器与无功元件结合的可能性，以实现切碎交流链路，从而减少电压转换和隔离所需的磁芯尺寸。这种方法的主要优点是，静态功率转换器只需要六个设备来实现三相电子变压器，这使其成为一种经济的解决方案。讨论了工作原理、磁设计等实际问题。本文给出了详细的计算机模拟并进行了实验验证。
The concept of realizing a small size "solid-state" transformer has been discussed for some time. A fairly straightforward approach to accomplish size reduction in a transformer feeding a conventional rectifier-inverter system is to introduce an isolated DC-DC converter in the DC link, isolation being provided by a high frequency transformer. So also, several topologies that employ AC-AC converters connected on primary and secondary sides of a high frequency transformer to reduce the size and weight of the magnetic core have been reported in literature. Such AC-AC converters need switches with bi-directional voltage blocking and current carrying capability, which are commonly realized with pairs of gate turn-off devices such as insulated gate bipolar transistors (IGBT). This paper explores the possibilities of employing AC-AC switched mode power converters in combination with reactive elements to realize a chopped AC link, thereby decreasing the required magnetic core size for voltage transformation and isolation. A primary advantage of this approach is that, the static power converter needs only six devices to implement a three-phase electronic transformer, which makes it an economical solution. Operating principles, magnetic design and other practical issues are discussed. Detailed computer simulations accompanied with experimental verification are presented in the paper.