Soft-switched high-frequency power converters for energy systems

用于能源系统的软开关高频功率转换器

• 批准号: 6805-2010
• 负责人: Bhat, Ashoka
• 金额: $ 2.4万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=450031
• 关键词: Soft; switched; frequency; power; converters

With increased energy demand and environmental concerns, alternate energy sources (fuel cell, wind, photovoltaic and ocean) are becoming popular. The outputs of these energy sources vary widely including some operational limits. Some examples are: (1) Fuel cells generate widely varying low voltage dc (e.g., 22 to 41 V) having slow transient response for load changes and has degraded performance with ripple currents. (2) Permanent magnet synchronous generators used with wind turbines generate varying voltage and varying frequency ac output demanding power factor (pf) corrected ac/dc converters to get a regulated dc bus. For all these sources, an additional dc/ac converter is required for stand alone or utility interface to augment power generation. In addition, when different energy sources are connected to a dc bus, a bidirectional dc-to-dc converter is needed for battery charging as well as to supply the dc bus and an electrolyser used to generate hydrogen for fuel cells requires a dc/dc converter. Therefore, all these energy sources require low cost, highly efficient dc/dc, dc/ac and ac/dc power electronic converters while satisfying the constraints imposed by the energy sources. This is possible using soft-switching (including resonant) converters operating with low losses and high switching frequencies. These converters have a number of advantages, e.g., high efficiency, small size, light weight, reduced EMI, low component stresses, etc.

随着能源需求和环境问题的增加，替代能源（燃料电池、风能、光伏和海洋）正变得越来越受欢迎。这些能源的输出变化很大，包括一些操作限制。一些例子是：（1）燃料电池产生广泛变化的低电压直流（例如，22至41 V），对负载变化具有缓慢的瞬态响应，并且在涟漪电流下性能下降。(2)与风力涡轮机一起使用的永磁同步发电机产生变化的电压和变化的频率的交流输出，这要求功率因数（pf）校正的ac/dc转换器以获得调节的dc总线。对于所有这些电源，独立或公用事业接口都需要额外的DC/AC转换器，以增加发电量。此外，当不同的能量源连接到直流总线时，需要双向直流-直流转换器用于电池充电以及为直流总线供电，并且用于为燃料电池产生氢气的电解槽需要直流/直流转换器。 因此，所有这些能源都需要低成本、高效率的dc/dc、dc/ac和ac/dc电力电子转换器，同时满足能源所施加的约束。这可以使用以低损耗和高开关频率工作的软开关（包括谐振）转换器。这些转换器具有许多优点，例如，高效率、小尺寸、轻重量、减小的EMI、低部件应力等。