摘要
直流融冰技术因其效率高、覆盖面广等优点已成为我国电网抵御大规模冰冻灾害使用最为频繁和有效的手段。随着技术的进步,直流融冰装置也从传统的晶闸管融冰装置向功能复用的MMC直流融冰装置方向发展。但与此同时由于已有变电站本身剩余空间的局限和MMC直流融冰装置占地较大,存在制约装置的现场安装布置。为此本文围绕MMC型直流融冰装置小型化开展研究工作。论文首先从功率模块结构优化设计入手,基于ANSYS Icepak平台对所选型的散热器进行热分析,得到了功率模块的结构温度场分布并实现了模块相比于传统结构的减小30%的设计。在此基础上,针对融冰装置经常移动需求,提出了采用强迫风冷作为设备散热方式。此外,结合装置日常作为无功补偿长期运行的特征,提出了下进风和侧进风两种方式,为工程实际应用提供了依据。
DC ice-melting technology has become the most frequently used and effective means in power grid to resist large-scale freezing disasters due to its high efficiency and wide coverage. With the advancement of technology, the DC ice melting device has also developed from the traditional thyristor ice-melting device to the MMC DC ice-melting device with multiple functions. At the same time, due to the limitation of the remaining space of the existing substation itself and the large area of the MMC DC ice-melting device, there are restrictions on the installation and arrangement of the device on-site. For this reason, this article focuses on the miniaturization of MMC DC ice-melting device. The structural optimization design of the power module was first carried out in the paper. Based on the ANSYS Icepak platform, the selected type of heat sink was analyzed thermally. The temperature field of the power module was obtained and the structure was designed to be less than 30% compared to the traditional design. On this basis, in response to the frequent movement of the ice-melting device, forced air cooling is proposed as a heat dissipation method for the equipment. In addition, combined with the long-term operation characteristics of the device as a reactive power compensation device, two methods of downward air intake and side air intake are proposed, which provide a basis for practical engineering applications.
