基于高频大功率分离式平面线圈耦合传能的配网电力电子变压器关键技术研究

为满足分布式能源的大规模接入，兼具电压变换、电气隔离、功率调节与控制和分布式能源接入等多种功能的电力电子变压器（ PET）将成为未来配电网中的关键设备。本项目以基于高频大功率分离式平面线圈耦合传能的配网PET为研究对象，研究高频大功率分离式平面变压器的构造机理和关键参数的设计优化及杂散参数的提取方法，适用于高频大功率分离式平面变压器的谐振补偿网络及模块化DC-DC变换器中功率器件宽范围内软开关的实现方法，基于高频大功率分离式平面变压器的多个模块化DC-DC变换器串并联条件下的功率均衡控制方法和冗余容错控制策略。本项目旨在为配网PET实现高频、高效、高隔离电压的功率变换提供新的理论和方法。项目的研究将解决基于高频大功率分离式平面线圈耦合传能的配网PET中的若干关键问题，形成相应的分析、设计理论体系，为我国PET设备的制造提供一种有竞争力的解决方案。

In order to accommodate the large-scale distributed energies, the power electronic transformer (PET), which has the functions of voltage conversion, electrical isolation, power regulation and control and distributed energies integration, will become the key equipment in the future distribution power grid. In this project, the distribution power grid PET based on the high-frequency high-power split planar coils coupling power transfer is taken as the research object. The construction mechanism, key parameters design and optimization and the stray parameters extraction method of the high-frequency high-power split planar transformer are studied. The resonance compensation network which is suitable for the high-frequency high-power split planar transformer and the control methods which guarantee the power devices to realize wide soft switching range in the modular DC-DC converter are investigated. The power balance control method and the redundant fault tolerant control strategy of the input-series-output-parallel-connected modular DC-DC converters based on the high-frequency high-power split planar transformer are proposed. The purpose of this project is to provide a new theory and method for the distribution power grid PET power transfer with high frequency, high efficiency and high isolation voltage. The outcomes of the project will solve some key issues in the distribution power grid PET based on the high-frequency high-power split planar coils coupling power transfer, form the corresponding analysis and design theoretical framework, and provide a competitive solution for the PET equipment manufacturing in China.