AC-DC Hybrid Electric Power Systems

世纪以来，电力系统已经发展成为一个专门以交流（AC）形式产生和分配能量的系统;尽管在特定情况下已经使用高压直流（HVDC）传输，但是传输系统仍然主要是AC。这是因为，尽管爱迪生的早期直流电力系统有其优点，但它还是输给了交流电力系统，主要原因是缺乏“直流Transformer”，以及因此而造成的远距离部署的巨大能量损失。然而，近年来，有效的电子能量转换的进步已经重新引起了对DC电力系统的兴趣，以补充现有的AC系统。直流电在海底电力传输方面具有上级优势，例如海上风电场。此外，大多数能量存储设备和现代发电机（例如光伏系统、风力涡轮机和燃料电池）可以更方便和有效地与DC基础设施接口。此外，电能的消耗主要以DC形式发生。另一方面，交流电源具有独特的优点，是现有电力基础设施和设备的基础。因此，相信未来的电力系统将受益于DC和AC功率的组合。因此，建议的研究的总体目标是研究混合电力系统中，交流和直流共存。更具体地说，研究将开发和确定：

For more than a century, the electric power system has evolved into one in which energy is generated and distributed exclusively in the Alternating Current (AC) form; even though High-Voltage Direct Current (HVDC) transmission has been used in specific cases, the transmission system is nonetheless predominantly AC. This is because, despite its merits, Edison's early DC electric power system lost the battle to its AC counterpart, mainly due to the lack of a "DC transformer" and consequent prohibitively large energy losses for long-distance deployment. In recent years, however, advancements in efficient electronic energy conversion have renewed interests in DC electric power systems to supplement the existing AC system. DC power is superior when it comes to sub-sea power transmission, from offshore wind farms for example. Moreover, most energy storage devices and modern electric power generators (such as photovoltaic systems, wind turbines, and fuel cells) can more conveniently and efficiently be interfaced with a DC infrastructure. Furthermore, the consumption of electric energy primarily takes place in the DC form. On the other hand, AC power possesses distinct merits and is the foundation of the existing electric power infrastructure and equipment. Hence, it is believed that the power system of the future will benefit from a combination of both DC and AC powers. The overall objective of the proposed research is thus to study hybrid electric power systems in which AC and DC coexist. More specifically, the research will develop and identify: